Basic conversion operators for humidity, temperature and pressure

docs/source/conf.py

@@ -8,7 +8,7 @@
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
 
 project = "CSET"
-copyright = "Crown copyright, Met Office (2022-2025) and CSET contributors."
+copyright = "Crown copyright, Met Office (2022-2026) and CSET contributors."
 author = "Met Office and Partners"
 
 # -- General configuration ---------------------------------------------------

docs/source/index.rst

@@ -104,7 +104,7 @@ Conduct`_.
 Licence
 -------
 
-© Crown copyright, Met Office (2022-2025) and CSET contributors.
+© Crown copyright, Met Office (2022-2026) and CSET contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License"); you
 may not use this file except in compliance with the License. You may obtain a

docs/source/reference/operators.rst

@@ -95,6 +95,15 @@ CSET.operators.ensembles
 .. automodule:: CSET.operators.ensembles
    :members:
 
+Humidity Operators
+~~~~~~~~~~~~~~~~~~
+
+CSET.operators.humidity
+-----------------------
+
+.. automodule:: CSET.operators.humidity
+   :members:
+
 Image Processing Operators
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -113,6 +122,24 @@ CSET.operators.mesoscale
 .. automodule:: CSET.operators.mesoscale
    :members:
 
+Pressure Operators
+~~~~~~~~~~~~~~~~~~
+
+CSET.operators.pressure
+-----------------------
+
+.. automodule:: CSET.operators.pressure
+   :members:
+
+Temperature Operators
+~~~~~~~~~~~~~~~~~~~~~
+
+CSET.operators.temperature
+--------------------------
+
+.. automodule:: CSET.operators.temperature
+   :members:
+
 Wind Operators
 ~~~~~~~~~~~~~~~~~~~
 

src/CSET/operators/__init__.py

@@ -1,4 +1,4 @@
-# © Crown copyright, Met Office (2022-2024) and CSET contributors.
+# © Crown copyright, Met Office (2022-2026) and CSET contributors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -34,12 +34,15 @@
     convection,
     ensembles,
     filters,
+    humidity,
     imageprocessing,
     mesoscale,
     misc,
     plot,
+    pressure,
     read,
     regrid,
+    temperature,
     transect,
     wind,
     write,
@@ -56,13 +59,16 @@
     "ensembles",
     "execute_recipe",
     "filters",
+    "humidity",
     "get_operator",
     "imageprocessing",
     "mesoscale",
     "misc",
     "plot",
+    "pressure",
     "read",
     "regrid",
+    "temperature",
     "transect",
     "wind",
     "write",

src/CSET/operators/_atmospheric_constants.py

@@ -0,0 +1,41 @@
+# © Crown copyright, Met Office (2022-2026) and CSET contributors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Constants for the atmosphere."""
+
+# Reference pressure.
+P0 = 1000.0  # hPa.
+
+# Specific gas constant for dry air.
+RD = 287.0  # J/kg/K.
+
+# Specific gas constant for water vapour.
+RV = 461.0  # J/kg/K.
+
+# Specific heat capacity for dry air.
+CPD = 1005.7  # J/kg/K.
+
+# Latent heat of vaporization.
+LV = 2.501e6  # J/kg/K.
+
+# Reference vapour pressure.
+E0 = 6.1078  # hPa.
+
+# Reference temperature.
+T0 = 273.15  # K.
+
+# Ratio between mixing ratio of dry and moist air.
+EPSILON = 0.622
+
+# Ratio between specific gas constant and specific heat capacity.
+KAPPA = RD / CPD