Coverage for src / CSET / operators / atmospheric_constants.py: 0%

1# © Crown copyright, Met Office (2022-2026) and CSET contributors. 

2# 

3# Licensed under the Apache License, Version 2.0 (the "License"); 

4# you may not use this file except in compliance with the License. 

5# You may obtain a copy of the License at 

6# 

7# http://www.apache.org/licenses/LICENSE-2.0 

8# 

9# Unless required by applicable law or agreed to in writing, software 

10# distributed under the License is distributed on an "AS IS" BASIS, 

11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

12# See the License for the specific language governing permissions and 

13# limitations under the License. 

14"""Constants for the atmosphere.""" 

15 

16# Reference pressure. 

17P0 = 1000.0 # hPa 

18 

19# Specific gas constant for dry air. 

20RD = 287.0 

21 

22# Specific gas constant for water vapour. 

23RV = 461.0 

24 

25# Specific heat capacity for dry air. 

26CPD = 1005.7 

27 

28# Latent heat of vaporization. 

29LV = 2.501e6 

30 

31# Reference vapour pressure. 

32E0 = 6.1078 # hPa 

33 

34# Reference temperature. 

35T0 = 273.15 # K 

36 

37# Ratio between mixing ratio of dry and moist air. 

38EPSILON = 0.622 

39 

40# Ratio between specific gas constant and specific heat capacity. 

41KAPPA = RD / CPD