diff --git a/.github/workflows/export-cmor-cvs-table.yaml b/.github/workflows/export-cmor-cvs-table.yaml
index 45a453fa..abfdf3de 100644
--- a/.github/workflows/export-cmor-cvs-table.yaml
+++ b/.github/workflows/export-cmor-cvs-table.yaml
@@ -26,7 +26,7 @@ jobs:
           ESGVOC_REVISION: "5145b8f6d8b1859c663e63fb7b0bad952e8bc7b5"
           # Modify these as needed
           UNIVERSE_CVS_FORK: "znichollscr"
-          UNIVERSE_CVS_BRANCH: "add-abrupt-experiments"
+          UNIVERSE_CVS_BRANCH: "add-amip-experiments"
           CMIP7_CVS_FORK: ${{ github.event.pull_request.head.repo.owner.login }}
           CMIP7_CVS_BRANCH: ${{ github.head_ref || github.ref_name }}
         run: |
diff --git a/activity/c4mip.json b/activity/c4mip.json
index 649cb60b..2649ec9d 100644
--- a/activity/c4mip.json
+++ b/activity/c4mip.json
@@ -4,7 +4,10 @@
     "type": "activity",
     "experiments": [
         "1pctco2-bgc",
-        "1pctco2-rad"
+        "1pctco2-rad",
+        "esm-flat10",
+        "esm-flat10-cdr",
+        "esm-flat10-zec"
     ],
     "urls": [
         "https://doi.org/10.5194/egusphere-2024-3356",
diff --git a/activity/cfmip.json b/activity/cfmip.json
index fec418e2..c649a203 100644
--- a/activity/cfmip.json
+++ b/activity/cfmip.json
@@ -4,7 +4,9 @@
     "type": "activity",
     "experiments": [
         "abrupt-0p5xco2",
-        "abrupt-2xco2"
+        "abrupt-2xco2",
+        "amip-p4k",
+        "amip-piforcing"
     ],
     "urls": [
         "https://doi.org/10.5194/gmd-10-359-2017"
diff --git a/activity/cmip.json b/activity/cmip.json
index d5d88a24..7e96d153 100644
--- a/activity/cmip.json
+++ b/activity/cmip.json
@@ -4,7 +4,14 @@
     "type": "activity",
     "experiments": [
         "1pctco2",
-        "abrupt-4xco2"
+        "abrupt-4xco2",
+        "amip",
+        "esm-hist",
+        "esm-picontrol",
+        "esm-picontrol-spinup",
+        "historical",
+        "picontrol",
+        "picontrol-spinup"
     ],
     "urls": [
         "https://doi.org/10.5194/gmd-18-6671-2025"
diff --git a/activity/damip.json b/activity/damip.json
new file mode 100644
index 00000000..2c99418a
--- /dev/null
+++ b/activity/damip.json
@@ -0,0 +1,13 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "damip",
+    "type": "activity",
+    "experiments": [
+        "hist-aer",
+        "hist-ghg",
+        "hist-nat"
+    ],
+    "urls": [
+        "https://doi.org/10.5194/gmd-18-4399-2025"
+    ]
+}
diff --git a/activity/pmip.json b/activity/pmip.json
new file mode 100644
index 00000000..c9a25f50
--- /dev/null
+++ b/activity/pmip.json
@@ -0,0 +1,12 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "pmip",
+    "type": "activity",
+    "experiments": [
+        "abrupt-127k"
+    ],
+    "urls": [
+        "https://doi.org/10.5194/cp-19-883-2023",
+        "https://doi.org/10.5194/gmd-10-3979-2017"
+    ]
+}
diff --git a/cmor-cvs.json b/cmor-cvs.json
index 768057d7..63c21ae2 100644
--- a/cmor-cvs.json
+++ b/cmor-cvs.json
@@ -9,7 +9,9 @@
         "activity_id": {
             "C4MIP": "Coupled climate carbon cycle model intercomparison project: exploration of the response of the coupled carbon-climate system.",
             "CFMIP": "Cloud feedback model intercomparison project. Focussed primarily on cloud feedbacks with a secondary focus on understanding of response to forcing, model biases, circulation, regional-scale precipitation, and non-linear changes.",
-            "CMIP": "CMIP core common experiments i.e. the DECK (Diagnostic, Evaluation and Characterization of Klima)",
+            "CMIP": "CMIP core common experiments i.e. the DECK (Diagnostic, Evaluation and Characterization of Klima).",
+            "DAMIP": "Detection and attribution model intercomparison project: exploration of the role of individual forcings (both anthropogenic and natural) in past and future climate change.",
+            "PMIP": "Palaeoclimate modelling intercomparison project: assessment of paleoclimate i.e. climate thousands of years or more in the past.",
             "ScenarioMIP": "Future scenario experiments. Exploration of the future climate under a (selected) range of possible boundary conditions"
         },
         "area_label": {
@@ -121,6 +123,24 @@
                 "start_year": "",
                 "tier": 1
             },
+            "abrupt-127k": {
+                "activity_id": [
+                    "PMIP"
+                ],
+                "description": "Simulation to examine the response to orbital and greenhouse gas concentration changes associated with the last interglacial (127 000 years before present).",
+                "end_year": "",
+                "experiment": "Simulation to examine the response to orbital and greenhouse gas concentration changes associated with the last interglacial (127 000 years before present).",
+                "experiment_id": "abrupt-127k",
+                "min_number_yrs_per_sim": 100,
+                "parent_activity_id": [
+                    "CMIP"
+                ],
+                "parent_experiment_id": [
+                    "piControl"
+                ],
+                "start_year": "",
+                "tier": 1
+            },
             "abrupt-2xCO2": {
                 "activity_id": [
                     "CFMIP"
@@ -157,13 +177,109 @@
                 "start_year": "",
                 "tier": 1
             },
+            "amip": {
+                "activity_id": [
+                    "CMIP"
+                ],
+                "description": "Simulation of the climate of the recent past with prescribed sea surface temperatures and sea ice concentrations.",
+                "end_year": 2021,
+                "experiment": "Simulation of the climate of the recent past with prescribed sea surface temperatures and sea ice concentrations.",
+                "experiment_id": "amip",
+                "min_number_yrs_per_sim": 43,
+                "parent_activity_id": [],
+                "parent_experiment_id": [],
+                "start_year": 1979,
+                "tier": 1
+            },
+            "amip-p4k": {
+                "activity_id": [
+                    "CFMIP"
+                ],
+                "description": "Same as `amip` simulation, except sea surface temperatures are increased by 4K in ice-free regions.",
+                "end_year": 2021,
+                "experiment": "Same as `amip` simulation, except sea surface temperatures are increased by 4K in ice-free regions.",
+                "experiment_id": "amip-p4k",
+                "min_number_yrs_per_sim": 43,
+                "parent_activity_id": [],
+                "parent_experiment_id": [],
+                "start_year": 1979,
+                "tier": 1
+            },
+            "amip-piForcing": {
+                "activity_id": [
+                    "CFMIP"
+                ],
+                "description": "Same as `amip` simulation, except it starts in 1870 and all forcings are set to pre-industrial levels rather than time-varying forcings.",
+                "end_year": 2021,
+                "experiment": "Same as `amip` simulation, except it starts in 1870 and all forcings are set to pre-industrial levels rather than time-varying forcings.",
+                "experiment_id": "amip-piForcing",
+                "min_number_yrs_per_sim": 152,
+                "parent_activity_id": [],
+                "parent_experiment_id": [],
+                "start_year": 1870,
+                "tier": 1
+            },
+            "esm-flat10": {
+                "activity_id": [
+                    "C4MIP"
+                ],
+                "description": "10 PgC / yr constant carbon dioxide emissions.",
+                "end_year": "",
+                "experiment": "10 PgC / yr constant carbon dioxide emissions.",
+                "experiment_id": "esm-flat10",
+                "min_number_yrs_per_sim": 100,
+                "parent_activity_id": [
+                    "CMIP"
+                ],
+                "parent_experiment_id": [
+                    "esm-piControl"
+                ],
+                "start_year": "",
+                "tier": 1
+            },
+            "esm-flat10-cdr": {
+                "activity_id": [
+                    "C4MIP"
+                ],
+                "description": "Extension of `esm-flat10` where emissions decline linearly to -10 PgC / yr then stay constant until cumulative emissions (including the emissions in `esm-flat10`) reach zero. An extra 20 years is included at the end to allow for calculating averages over different time windows.",
+                "end_year": "",
+                "experiment": "Extension of `esm-flat10` where emissions decline linearly to -10 PgC / yr then stay constant until cumulative emissions (including the emissions in `esm-flat10`) reach zero. An extra 20 years is included at the end to allow for calculating averages over different time windows.",
+                "experiment_id": "esm-flat10-cdr",
+                "min_number_yrs_per_sim": 220,
+                "parent_activity_id": [
+                    "C4MIP"
+                ],
+                "parent_experiment_id": [
+                    "esm-flat10"
+                ],
+                "start_year": "",
+                "tier": 1
+            },
+            "esm-flat10-zec": {
+                "activity_id": [
+                    "C4MIP"
+                ],
+                "description": "Extension of `esm-flat10` with zero emissions.",
+                "end_year": "",
+                "experiment": "Extension of `esm-flat10` with zero emissions.",
+                "experiment_id": "esm-flat10-zec",
+                "min_number_yrs_per_sim": 100,
+                "parent_activity_id": [
+                    "C4MIP"
+                ],
+                "parent_experiment_id": [
+                    "esm-flat10"
+                ],
+                "start_year": "",
+                "tier": 1
+            },
             "esm-hist": {
                 "activity_id": [
                     "CMIP"
                 ],
-                "description": "Simulation of the climate of the recent past (typically meaning 1850 to present-day) with prescribed CO2 emissions (for prescribed CO2 concentration runs, see `historical`)",
+                "description": "Simulation of the climate of the recent past (typically meaning 1850 to present-day) with prescribed carbon dioxide emissions (for prescribed carbon dioxide concentrations, see `historical`).",
                 "end_year": 2021,
-                "experiment": "Simulation of the climate of the recent past (typically meaning 1850 to present-day) with prescribed CO2 emissions (for prescribed CO2 concentration runs, see `historical`)",
+                "experiment": "Simulation of the climate of the recent past (typically meaning 1850 to present-day) with prescribed carbon dioxide emissions (for prescribed carbon dioxide concentrations, see `historical`).",
                 "experiment_id": "esm-hist",
                 "min_number_yrs_per_sim": 172,
                 "parent_activity_id": [
@@ -179,11 +295,11 @@
                 "activity_id": [
                     "CMIP"
                 ],
-                "description": "Pre-industrial control simulation with prescribed CO2 emissions (for pre-industrial control with prescribed CO2 concentrations, see `piControl`). Used to characterise natural variability and unforced behaviour.",
+                "description": "Pre-industrial control simulation with prescribed carbon dioxide emissions (for prescribed carbon dioxide concentrations, see `piControl`). Used to characterise natural variability and unforced behaviour.",
                 "end_year": "",
-                "experiment": "Pre-industrial control simulation with prescribed CO2 emissions (for pre-industrial control with prescribed CO2 concentrations, see `piControl`). Used to characterise natural variability and unforced behaviour.",
+                "experiment": "Pre-industrial control simulation with prescribed carbon dioxide emissions (for prescribed carbon dioxide concentrations, see `piControl`). Used to characterise natural variability and unforced behaviour.",
                 "experiment_id": "esm-piControl",
-                "min_number_yrs_per_sim": 500,
+                "min_number_yrs_per_sim": 400,
                 "parent_activity_id": [
                     "CMIP"
                 ],
@@ -197,15 +313,15 @@
                 "activity_id": [
                     "CMIP"
                 ],
-                "description": "Pre-industrial control spin-up simulation with prescribed CO2 emissions (for spin-up with prescribed CO2 concentrations, see `piControl-spinup`). Used to get the model into a state of approximate radiative equilibrium before starting the piControl simulation.",
+                "description": "Spin-up simulation. Used to get the model into a state of approximate radiative equilibrium before starting the `esm-piControl` simulation.",
                 "end_year": "",
-                "experiment": "Pre-industrial control spin-up simulation with prescribed CO2 emissions (for spin-up with prescribed CO2 concentrations, see `piControl-spinup`). Used to get the model into a state of approximate radiative equilibrium before starting the piControl simulation.",
+                "experiment": "Spin-up simulation. Used to get the model into a state of approximate radiative equilibrium before starting the `esm-piControl` simulation.",
                 "experiment_id": "esm-piControl-spinup",
                 "min_number_yrs_per_sim": "",
                 "parent_activity_id": [],
                 "parent_experiment_id": [],
                 "start_year": "",
-                "tier": 1
+                "tier": 3
             },
             "esm-scen7-h": {
                 "activity_id": [
@@ -459,13 +575,67 @@
                 "start_year": 2100,
                 "tier": 0
             },
+            "hist-GHG": {
+                "activity_id": [
+                    "DAMIP"
+                ],
+                "description": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+                "end_year": 2035,
+                "experiment": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+                "experiment_id": "hist-GHG",
+                "min_number_yrs_per_sim": 186,
+                "parent_activity_id": [
+                    "CMIP"
+                ],
+                "parent_experiment_id": [
+                    "piControl"
+                ],
+                "start_year": 1850,
+                "tier": 1
+            },
+            "hist-aer": {
+                "activity_id": [
+                    "DAMIP"
+                ],
+                "description": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+                "end_year": 2035,
+                "experiment": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+                "experiment_id": "hist-aer",
+                "min_number_yrs_per_sim": 186,
+                "parent_activity_id": [
+                    "CMIP"
+                ],
+                "parent_experiment_id": [
+                    "piControl"
+                ],
+                "start_year": 1850,
+                "tier": 1
+            },
+            "hist-nat": {
+                "activity_id": [
+                    "DAMIP"
+                ],
+                "description": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+                "end_year": 2035,
+                "experiment": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+                "experiment_id": "hist-nat",
+                "min_number_yrs_per_sim": 186,
+                "parent_activity_id": [
+                    "CMIP"
+                ],
+                "parent_experiment_id": [
+                    "piControl"
+                ],
+                "start_year": 1850,
+                "tier": 1
+            },
             "historical": {
                 "activity_id": [
                     "CMIP"
                 ],
-                "description": "Simulation of the climate of the recent past (typically meaning 1850 to present-day)",
+                "description": "Simulation of the climate of the recent past (typically meaning 1850 to present-day) with prescribed carbon dioxide concentrations (for prescribed carbon dioxide emissions, see `esm-hist`).",
                 "end_year": 2021,
-                "experiment": "Simulation of the climate of the recent past (typically meaning 1850 to present-day)",
+                "experiment": "Simulation of the climate of the recent past (typically meaning 1850 to present-day) with prescribed carbon dioxide concentrations (for prescribed carbon dioxide emissions, see `esm-hist`).",
                 "experiment_id": "historical",
                 "min_number_yrs_per_sim": 172,
                 "parent_activity_id": [
@@ -481,11 +651,11 @@
                 "activity_id": [
                     "CMIP"
                 ],
-                "description": "Pre-industrial control simulation. Used to characterise natural variability and unforced behaviour.",
+                "description": "Pre-industrial control simulation with prescribed carbon dioxide concentrations (for prescribed carbon dioxide emissions, see `esm-piControl`). Used to characterise natural variability and unforced behaviour.",
                 "end_year": "",
-                "experiment": "Pre-industrial control simulation. Used to characterise natural variability and unforced behaviour.",
+                "experiment": "Pre-industrial control simulation with prescribed carbon dioxide concentrations (for prescribed carbon dioxide emissions, see `esm-piControl`). Used to characterise natural variability and unforced behaviour.",
                 "experiment_id": "piControl",
-                "min_number_yrs_per_sim": 500,
+                "min_number_yrs_per_sim": 400,
                 "parent_activity_id": [
                     "CMIP"
                 ],
@@ -499,15 +669,15 @@
                 "activity_id": [
                     "CMIP"
                 ],
-                "description": "Pre-industrial control spin-up simulation. Used to get the model into a state of approximate radiative equilibrium before starting the piControl simulation.",
+                "description": "Spin-up simulation. Used to get the model into a state of approximate radiative equilibrium before starting the `piControl` simulation.",
                 "end_year": "",
-                "experiment": "Pre-industrial control spin-up simulation. Used to get the model into a state of approximate radiative equilibrium before starting the piControl simulation.",
+                "experiment": "Spin-up simulation. Used to get the model into a state of approximate radiative equilibrium before starting the `piControl` simulation.",
                 "experiment_id": "piControl-spinup",
                 "min_number_yrs_per_sim": "",
                 "parent_activity_id": [],
                 "parent_experiment_id": [],
                 "start_year": "",
-                "tier": 1
+                "tier": 3
             },
             "scen7-h": {
                 "activity_id": [
diff --git a/create-cmor-cvs-table-export-environment.sh b/create-cmor-cvs-table-export-environment.sh
index c0f3f60b..ae7fc28d 100644
--- a/create-cmor-cvs-table-export-environment.sh
+++ b/create-cmor-cvs-table-export-environment.sh
@@ -7,9 +7,9 @@ python3.13 -m venv venv
 ESGVOC_FORK="znichollscr"
 ESGVOC_REVISION="5145b8f6d8b1859c663e63fb7b0bad952e8bc7b5"
 UNIVERSE_CVS_FORK="znichollscr"
-UNIVERSE_CVS_BRANCH="add-abrupt-experiments"
+UNIVERSE_CVS_BRANCH="add-amip-experiments"
 CMIP7_CVS_FORK="znichollscr"
-CMIP7_CVS_BRANCH="add-abrupt-experiments"
+CMIP7_CVS_BRANCH="add-amip-experiments"
 
 venv/bin/pip install -r requirements-cmor-cvs-table.txt
 venv/bin/pip install --no-deps "git+https://github.com/$ESGVOC_FORK/esgf-vocab.git@$ESGVOC_REVISION"
diff --git a/experiment/abrupt-127k.json b/experiment/abrupt-127k.json
new file mode 100644
index 00000000..f670c043
--- /dev/null
+++ b/experiment/abrupt-127k.json
@@ -0,0 +1,8 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "abrupt-127k",
+    "type": "experiment",
+    "min_number_yrs_per_sim": 100.0,
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/amip-p4k.json b/experiment/amip-p4k.json
new file mode 100644
index 00000000..e6ca3dcd
--- /dev/null
+++ b/experiment/amip-p4k.json
@@ -0,0 +1,10 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "amip-p4k",
+    "type": "experiment",
+    "start_timestamp": "1979-01-01",
+    "end_timestamp": "2021-12-31",
+    "min_number_yrs_per_sim": 43.0,
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/amip-piforcing.json b/experiment/amip-piforcing.json
new file mode 100644
index 00000000..5cef2a14
--- /dev/null
+++ b/experiment/amip-piforcing.json
@@ -0,0 +1,10 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "amip-piforcing",
+    "type": "experiment",
+    "start_timestamp": "1870-01-01",
+    "end_timestamp": "2021-12-31",
+    "min_number_yrs_per_sim": 152.0,
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/amip.json b/experiment/amip.json
new file mode 100644
index 00000000..36a93ce4
--- /dev/null
+++ b/experiment/amip.json
@@ -0,0 +1,10 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "amip",
+    "type": "experiment",
+    "start_timestamp": "1979-01-01",
+    "end_timestamp": "2021-12-31",
+    "min_number_yrs_per_sim": 43.0,
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/esm-flat10-cdr.json b/experiment/esm-flat10-cdr.json
new file mode 100644
index 00000000..60364fd9
--- /dev/null
+++ b/experiment/esm-flat10-cdr.json
@@ -0,0 +1,7 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "esm-flat10-cdr",
+    "type": "experiment",
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/esm-flat10-zec.json b/experiment/esm-flat10-zec.json
new file mode 100644
index 00000000..fc7fb752
--- /dev/null
+++ b/experiment/esm-flat10-zec.json
@@ -0,0 +1,7 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "esm-flat10-zec",
+    "type": "experiment",
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/esm-flat10.json b/experiment/esm-flat10.json
new file mode 100644
index 00000000..5790474f
--- /dev/null
+++ b/experiment/esm-flat10.json
@@ -0,0 +1,7 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "esm-flat10",
+    "type": "experiment",
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/esm-hist.json b/experiment/esm-hist.json
index f222c439..d874c8cf 100644
--- a/experiment/esm-hist.json
+++ b/experiment/esm-hist.json
@@ -2,8 +2,9 @@
     "@context": "000_context.jsonld",
     "id": "esm-hist",
     "type": "experiment",
+    "start_timestamp": "1850-01-01",
     "end_timestamp": "2021-12-31",
-    "min_number_yrs_per_sim": 172,
+    "min_number_yrs_per_sim": 172.0,
     "parent_mip_era": "cmip7",
     "tier": 1
 }
diff --git a/experiment/esm-picontrol-spinup.json b/experiment/esm-picontrol-spinup.json
index 6092a1e7..de2c58bd 100644
--- a/experiment/esm-picontrol-spinup.json
+++ b/experiment/esm-picontrol-spinup.json
@@ -1,5 +1,8 @@
 {
     "@context": "000_context.jsonld",
     "id": "esm-picontrol-spinup",
-    "type": "experiment"
+    "type": "experiment",
+    "min_number_yrs_per_sim": null,
+    "parent_mip_era": null,
+    "tier": 3
 }
diff --git a/experiment/esm-picontrol.json b/experiment/esm-picontrol.json
index 9c6c3de1..74ebea2f 100644
--- a/experiment/esm-picontrol.json
+++ b/experiment/esm-picontrol.json
@@ -2,6 +2,7 @@
     "@context": "000_context.jsonld",
     "id": "esm-picontrol",
     "type": "experiment",
+    "min_number_yrs_per_sim": 400.0,
     "parent_mip_era": "cmip7",
     "tier": 1
 }
diff --git a/experiment/hist-aer.json b/experiment/hist-aer.json
new file mode 100644
index 00000000..4e29cb29
--- /dev/null
+++ b/experiment/hist-aer.json
@@ -0,0 +1,12 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "hist-aer",
+    "type": "experiment",
+    "description": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+    "start_timestamp": "1850-01-01",
+    "end_timestamp": "2035-12-31",
+    "min_number_yrs_per_sim": 186.0,
+    "min_ensemble_size": 3,
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/hist-ghg.json b/experiment/hist-ghg.json
new file mode 100644
index 00000000..8f8096a2
--- /dev/null
+++ b/experiment/hist-ghg.json
@@ -0,0 +1,12 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "hist-ghg",
+    "type": "experiment",
+    "description": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+    "start_timestamp": "1850-01-01",
+    "end_timestamp": "2035-12-31",
+    "min_number_yrs_per_sim": 186.0,
+    "min_ensemble_size": 3,
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/hist-nat.json b/experiment/hist-nat.json
new file mode 100644
index 00000000..76f42c67
--- /dev/null
+++ b/experiment/hist-nat.json
@@ -0,0 +1,12 @@
+{
+    "@context": "000_context.jsonld",
+    "id": "hist-nat",
+    "type": "experiment",
+    "description": "Response to historical aerosol forcing (with extension using forcings from the `m` scenario simulation). All other conditions are kept the same as piControl.",
+    "start_timestamp": "1850-01-01",
+    "end_timestamp": "2035-12-31",
+    "min_number_yrs_per_sim": 186.0,
+    "min_ensemble_size": 3,
+    "parent_mip_era": "cmip7",
+    "tier": 1
+}
diff --git a/experiment/historical.json b/experiment/historical.json
index 9403afc0..8b736345 100644
--- a/experiment/historical.json
+++ b/experiment/historical.json
@@ -2,8 +2,9 @@
     "@context": "000_context.jsonld",
     "id": "historical",
     "type": "experiment",
+    "start_timestamp": "1850-01-01",
     "end_timestamp": "2021-12-31",
-    "min_number_yrs_per_sim": 172,
+    "min_number_yrs_per_sim": 172.0,
     "parent_mip_era": "cmip7",
     "tier": 1
 }
diff --git a/experiment/picontrol-spinup.json b/experiment/picontrol-spinup.json
index 2f4686f4..3cf40116 100644
--- a/experiment/picontrol-spinup.json
+++ b/experiment/picontrol-spinup.json
@@ -1,5 +1,8 @@
 {
     "@context": "000_context.jsonld",
     "id": "picontrol-spinup",
-    "type": "experiment"
+    "type": "experiment",
+    "min_number_yrs_per_sim": null,
+    "parent_mip_era": null,
+    "tier": 3
 }
diff --git a/experiment/picontrol.json b/experiment/picontrol.json
index 3cacf332..1ff67182 100644
--- a/experiment/picontrol.json
+++ b/experiment/picontrol.json
@@ -2,6 +2,7 @@
     "@context": "000_context.jsonld",
     "id": "picontrol",
     "type": "experiment",
+    "min_number_yrs_per_sim": 400.0,
     "parent_mip_era": "cmip7",
     "tier": 1
 }