From 62cc765afcb143c20dfaa197a5e1fd48cd4fb49a Mon Sep 17 00:00:00 2001
From: Michael Wathen <mwathen@gmail.com>
Date: Fri, 3 Jul 2026 10:39:52 +0100
Subject: [PATCH 1/4] Adding testcase yaml file gotm runs to actions

---
 .github/workflows/ersem.yml                   |  2 +-
 .../gotm-fabm-ersem/gotm-testcase-yaml.sh     | 35 ++++++++++++++++
 .../gotm-fabm-ersem/test_testcase_yamls.py    | 42 +++++++++++++++++++
 3 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100755 github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh
 create mode 100644 github-actions/gotm-fabm-ersem/test_testcase_yamls.py

diff --git a/.github/workflows/ersem.yml b/.github/workflows/ersem.yml
index ffc6b29..96d8412 100644
--- a/.github/workflows/ersem.yml
+++ b/.github/workflows/ersem.yml
@@ -67,7 +67,7 @@ jobs:
         - name: Running gotm tests
           run: |
               python -m pip install pytest
-              pytest github-actions/gotm-fabm-ersem/test_state_variables.py github-actions/gotm-fabm-ersem/test_gotm.py
+              pytest github-actions/gotm-fabm-ersem/test_state_variables.py github-actions/gotm-fabm-ersem/test_gotm.py github-actions/gotm-fabm-ersem/test_testcase_yamls.py
 
   build-fabm0d-gotm-ersem-debian:
     runs-on: ubuntu-latest
diff --git a/github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh b/github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh
new file mode 100755
index 0000000..f2b932c
--- /dev/null
+++ b/github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -euo pipefail
+
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 <testcase-yaml>" >&2
+    exit 2
+fi
+
+TESTCASE_YAML="$1"
+if [ ! -f "${TESTCASE_YAML}" ]; then
+    echo "Testcase YAML not found: ${TESTCASE_YAML}" >&2
+    exit 2
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_DIR="$(cd "${SCRIPT_DIR}/../.." && pwd)"
+SETUPS_DIR="${GOTM_ERSEM_SETUPS_DIR:-${REPO_DIR}/ersem-setups}"
+GOTM_BIN="${GOTM_BIN:-${HOME}/local/gotm/bin/gotm}"
+
+if [ ! -x "${GOTM_BIN}" ]; then
+    echo "GOTM executable not found or not executable: ${GOTM_BIN}" >&2
+    exit 2
+fi
+
+if [ ! -d "${SETUPS_DIR}" ]; then
+    echo "Cloning config repo"
+    git clone https://github.com/pmlmodelling/ersem-setups.git "${SETUPS_DIR}"
+fi
+
+echo "Running GOTM with testcase YAML: ${TESTCASE_YAML}"
+cp "${TESTCASE_YAML}" "${SETUPS_DIR}/L4/fabm.yaml"
+cd "${SETUPS_DIR}/L4"
+
+"${GOTM_BIN}" --ignore_unknown_config
diff --git a/github-actions/gotm-fabm-ersem/test_testcase_yamls.py b/github-actions/gotm-fabm-ersem/test_testcase_yamls.py
new file mode 100644
index 0000000..cbab095
--- /dev/null
+++ b/github-actions/gotm-fabm-ersem/test_testcase_yamls.py
@@ -0,0 +1,42 @@
+"""
+Check that GOTM runs with every testcase YAML configuration.
+"""
+
+import subprocess
+from pathlib import Path
+
+import pytest
+
+
+REPO_DIR = Path(__file__).resolve().parents[2]
+TESTCASE_DIR = REPO_DIR / "testcases"
+RUNNER = Path(__file__).with_name("gotm-testcase-yaml.sh")
+
+YAML_PATTERNS = ("*.yaml", "*.yml")
+TESTCASE_YAMLS = sorted(
+    {path for pattern in YAML_PATTERNS for path in TESTCASE_DIR.rglob(pattern)}
+)
+
+
+def yaml_id(path):
+    return path.relative_to(TESTCASE_DIR).as_posix()
+
+
+@pytest.mark.parametrize("testcase_yaml", TESTCASE_YAMLS, ids=yaml_id)
+def test_gotm_runs_with_testcase_yaml(testcase_yaml):
+    """
+    Run GOTM with an ERSEM testcase YAML copied to the L4 setup.
+    """
+    result = subprocess.run(
+        ["bash", str(RUNNER), str(testcase_yaml)],
+        cwd=REPO_DIR,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True,
+    )
+
+    assert result.returncode == 0, (
+        f"GOTM failed for {testcase_yaml.relative_to(REPO_DIR)}\n"
+        f"stdout:\n{result.stdout}\n"
+        f"stderr:\n{result.stderr}"
+    )

From 2b67ea2e8da8fe030a2e7c14c511c9ac73c4392c Mon Sep 17 00:00:00 2001
From: Michael Wathen <mwathen@gmail.com>
Date: Fri, 3 Jul 2026 10:51:26 +0100
Subject: [PATCH 2/4] Updating testcase yaml files to run in seperate workflow

---
 .github/workflows/ersem.yml                   | 21 +++++++++++++-
 .../gotm-fabm-ersem/gotm-testcase-yaml.sh     | 29 +++++++++++++++++--
 2 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/ersem.yml b/.github/workflows/ersem.yml
index 96d8412..ea302a7 100644
--- a/.github/workflows/ersem.yml
+++ b/.github/workflows/ersem.yml
@@ -67,7 +67,26 @@ jobs:
         - name: Running gotm tests
           run: |
               python -m pip install pytest
-              pytest github-actions/gotm-fabm-ersem/test_state_variables.py github-actions/gotm-fabm-ersem/test_gotm.py github-actions/gotm-fabm-ersem/test_testcase_yamls.py
+              pytest github-actions/gotm-fabm-ersem/test_state_variables.py github-actions/gotm-fabm-ersem/test_gotm.py
+
+  test-gotm-testcase-yamls-debian:
+    runs-on: ubuntu-latest
+    steps:
+        - uses: actions/checkout@v2
+        - name: Setup python
+          uses: actions/setup-python@v2
+          with:
+              python-version: '3.x'
+        - name: Installing GOTM-FABM-ERSEM dependences
+          run: ./github-actions/gotm-fabm-ersem/gotm-fabm-ersem-dep-debian.sh
+        - name: Building and installing GOTM-FABM-ERSEM
+          run: |
+              BRANCH=${{ github.head_ref }}
+              ./github-actions/gotm-fabm-ersem/gotm-fabm-ersem-build.sh -b $BRANCH -f '-DCMAKE_Fortran_FLAGS="-fcheck=all"'
+        - name: Running GOTM testcase YAML tests
+          run: |
+              python -m pip install pytest
+              pytest github-actions/gotm-fabm-ersem/test_testcase_yamls.py
 
   build-fabm0d-gotm-ersem-debian:
     runs-on: ubuntu-latest
diff --git a/github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh b/github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh
index f2b932c..d1e7b7f 100755
--- a/github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh
+++ b/github-actions/gotm-fabm-ersem/gotm-testcase-yaml.sh
@@ -16,7 +16,9 @@ fi
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 REPO_DIR="$(cd "${SCRIPT_DIR}/../.." && pwd)"
 SETUPS_DIR="${GOTM_ERSEM_SETUPS_DIR:-${REPO_DIR}/ersem-setups}"
+L4_DIR="${SETUPS_DIR}/L4"
 GOTM_BIN="${GOTM_BIN:-${HOME}/local/gotm/bin/gotm}"
+GOTM_TEST_STOP="${GOTM_TEST_STOP:-2007-02-01 00:00:00}"
 
 if [ ! -x "${GOTM_BIN}" ]; then
     echo "GOTM executable not found or not executable: ${GOTM_BIN}" >&2
@@ -28,8 +30,31 @@ if [ ! -d "${SETUPS_DIR}" ]; then
     git clone https://github.com/pmlmodelling/ersem-setups.git "${SETUPS_DIR}"
 fi
 
+ORIGINAL_GOTM_YAML="$(mktemp "${L4_DIR}/gotm.yaml.original.XXXXXX")"
+TEST_GOTM_YAML="$(mktemp "${L4_DIR}/gotm.yaml.testcase.XXXXXX")"
+cp "${L4_DIR}/gotm.yaml" "${ORIGINAL_GOTM_YAML}"
+
+cleanup() {
+    cp "${ORIGINAL_GOTM_YAML}" "${L4_DIR}/gotm.yaml"
+    rm -f "${ORIGINAL_GOTM_YAML}" "${TEST_GOTM_YAML}"
+}
+trap cleanup EXIT
+
+awk -v stop="${GOTM_TEST_STOP}" '
+    /^time:[[:space:]]*$/ { in_time = 1 }
+    /^[^[:space:]]/ && !/^time:[[:space:]]*$/ { in_time = 0 }
+    in_time && /^[[:space:]]+stop:[[:space:]]/ {
+        sub(/stop:.*/, "stop: " stop)
+        updated = 1
+    }
+    { print }
+    END { if (!updated) exit 1 }
+' "${L4_DIR}/gotm.yaml" > "${TEST_GOTM_YAML}"
+
 echo "Running GOTM with testcase YAML: ${TESTCASE_YAML}"
-cp "${TESTCASE_YAML}" "${SETUPS_DIR}/L4/fabm.yaml"
-cd "${SETUPS_DIR}/L4"
+echo "Using temporary gotm.yaml stop date: ${GOTM_TEST_STOP}"
+cp "${TEST_GOTM_YAML}" "${L4_DIR}/gotm.yaml"
+cp "${TESTCASE_YAML}" "${L4_DIR}/fabm.yaml"
+cd "${L4_DIR}"
 
 "${GOTM_BIN}" --ignore_unknown_config

From a7bd302fee4fe31c92d5007dd96bc59b7cf52eb3 Mon Sep 17 00:00:00 2001
From: Michael Wathen <mwathen@gmail.com>
Date: Fri, 3 Jul 2026 14:25:57 +0100
Subject: [PATCH 3/4] Adding default values of exulim for ersem-15.06 and
 ersem-Blackford2024 testcase yaml files

---
 .../ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-denit.yaml | 4 ++++
 .../ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-n2o.yaml   | 4 ++++
 testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop.yaml | 4 ++++
 .../ersem-15.06/fabm-ersem-15.06-L4-noben-docdyn-iop.yaml     | 4 ++++
 .../fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml      | 4 ++++
 .../fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml    | 4 ++++
 6 files changed, 24 insertions(+)

diff --git a/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-denit.yaml b/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-denit.yaml
index 5776320..d42e585 100644
--- a/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-denit.yaml
+++ b/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-denit.yaml
@@ -286,6 +286,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.04                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.0042                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                         # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -352,6 +353,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.04                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.005                                          # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000225                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -415,6 +417,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.045                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.006                                          # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.00035                                        # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -475,6 +478,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.035                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.0042                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                         # minimum phosphorus to carbon ratio (mmol P/mg C)
diff --git a/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-n2o.yaml b/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-n2o.yaml
index 8d39a25..e6f1c0c 100644
--- a/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-n2o.yaml
+++ b/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop-n2o.yaml
@@ -279,6 +279,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.04                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.0042                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                         # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -345,6 +346,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.04                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.005                                          # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000225                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -408,6 +410,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.045                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.006                                          # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.00035                                        # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -468,6 +471,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.035                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.0042                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                         # minimum phosphorus to carbon ratio (mmol P/mg C)
diff --git a/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop.yaml b/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop.yaml
index 652033d..f31ded0 100644
--- a/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop.yaml
+++ b/testcases/ersem-15.06/fabm-ersem-15.06-L4-ben-docdyn-iop.yaml
@@ -269,6 +269,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.04                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.0042                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                         # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -335,6 +336,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.04                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.005                                          # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000225                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -398,6 +400,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.045                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.006                                          # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.00035                                        # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -458,6 +461,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.035                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                           # respired fraction of primary production (-)
       qnlc: 0.0042                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                         # minimum phosphorus to carbon ratio (mmol P/mg C)
diff --git a/testcases/ersem-15.06/fabm-ersem-15.06-L4-noben-docdyn-iop.yaml b/testcases/ersem-15.06/fabm-ersem-15.06-L4-noben-docdyn-iop.yaml
index 39efe57..3cade29 100644
--- a/testcases/ersem-15.06/fabm-ersem-15.06-L4-noben-docdyn-iop.yaml
+++ b/testcases/ersem-15.06/fabm-ersem-15.06-L4-noben-docdyn-iop.yaml
@@ -273,6 +273,7 @@ instances:
       q10: 2.0                                            # Q_10 temperature coefficient (-)
       srs: 0.04                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                          # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                          # respired fraction of primary production (-)
       qnlc: 0.0042                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                        # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -339,6 +340,7 @@ instances:
       q10: 2.0                                            # Q_10 temperature coefficient (-)
       srs: 0.04                                           # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                          # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                          # respired fraction of primary production (-)
       qnlc: 0.005                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000225                                      # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -402,6 +404,7 @@ instances:
       q10: 2.0                                            # Q_10 temperature coefficient (-)
       srs: 0.045                                          # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                          # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                          # respired fraction of primary production (-)
       qnlc: 0.006                                         # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.00035                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -462,6 +465,7 @@ instances:
       q10: 2.0                                            # Q_10 temperature coefficient (-)
       srs: 0.035                                          # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                          # excreted fraction of primary production (-)
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.2                                          # respired fraction of primary production (-)
       qnlc: 0.0042                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.0001                                        # minimum phosphorus to carbon ratio (mmol P/mg C)
diff --git a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml
index 4700ee6..f0e561d 100644
--- a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml
+++ b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml
@@ -256,6 +256,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.05                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.05                                          # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.1                                           # respired fraction of primary production (-)
       qnlc: 0.00687                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -321,6 +322,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.05                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                          # respired fraction of primary production (-)
       qnlc: 0.00687                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -383,6 +385,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.05                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                          # respired fraction of primary production (-)
       qnlc: 0.00687                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -442,6 +445,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.05                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.05                                          # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                          # respired fraction of primary production (-)
       qnlc: 0.00687                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
diff --git a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml
index 315bdd6..c23d845 100644
--- a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml
+++ b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml
@@ -259,6 +259,7 @@ instances:
       q10: 2.0                                        # Q_10 temperature coefficient (-)
       srs: 0.05                                       # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.05                                     # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.1                                      # respired fraction of primary production (-)
       qnlc: 0.00687                                   # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                  # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -324,6 +325,7 @@ instances:
       q10: 2.0                                        # Q_10 temperature coefficient (-)
       srs: 0.05                                       # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                      # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                     # respired fraction of primary production (-)
       qnlc: 0.00687                                   # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                  # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -386,6 +388,7 @@ instances:
       q10: 2.0                                        # Q_10 temperature coefficient (-)
       srs: 0.05                                       # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                      # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                     # respired fraction of primary production (-)
       qnlc: 0.00687                                   # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                  # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -445,6 +448,7 @@ instances:
       q10: 2.0                                        # Q_10 temperature coefficient (-)
       srs: 0.05                                       # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.05                                     # excreted fraction of primary production (-)
+      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                     # respired fraction of primary production (-)
       qnlc: 0.00687                                   # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                  # minimum phosphorus to carbon ratio (mmol P/mg C)

From cf1385cbe4b0493cdab6a0a8013bdb86b0b23c37 Mon Sep 17 00:00:00 2001
From: Michael Wathen <mwathen@gmail.com>
Date: Fri, 3 Jul 2026 14:44:57 +0100
Subject: [PATCH 4/4] Updating ersem-Blackford2024 exulim testcase param

---
 .../fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml      | 4 ++--
 .../fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml    | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml
index f0e561d..7498dfd 100644
--- a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml
+++ b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-ben-stdbac-stdlight.yaml
@@ -322,7 +322,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.05                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
-      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                          # respired fraction of primary production (-)
       qnlc: 0.00687                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -385,7 +385,7 @@ instances:
       q10: 2.0                                             # Q_10 temperature coefficient (-)
       srs: 0.05                                            # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                           # excreted fraction of primary production (-)
-      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                          # respired fraction of primary production (-)
       qnlc: 0.00687                                        # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                       # minimum phosphorus to carbon ratio (mmol P/mg C)
diff --git a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml
index c23d845..9affd10 100644
--- a/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml
+++ b/testcases/ersem-Blackford2024/fabm-ersem-Blackford2004-L4-noben-stdbac-stdlight.yaml
@@ -325,7 +325,7 @@ instances:
       q10: 2.0                                        # Q_10 temperature coefficient (-)
       srs: 0.05                                       # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                      # excreted fraction of primary production (-)
-      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                     # respired fraction of primary production (-)
       qnlc: 0.00687                                   # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                  # minimum phosphorus to carbon ratio (mmol P/mg C)
@@ -388,7 +388,7 @@ instances:
       q10: 2.0                                        # Q_10 temperature coefficient (-)
       srs: 0.05                                       # specific rest respiration at reference temperature (1/d)
       pu_ea: 0.2                                      # excreted fraction of primary production (-)
-      exulim: 0.95                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
+      exulim: 0.8                                    # excreted fraction of primary production due to nutrient stress,maximum=1._rk-self%pu_ea
       pu_ra: 0.25                                     # respired fraction of primary production (-)
       qnlc: 0.00687                                   # minimum nitrogen to carbon ratio (mmol N/mg C)
       qplc: 0.000428                                  # minimum phosphorus to carbon ratio (mmol P/mg C)