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Adds salinity dependence to the saturation specific humidity calculation #39

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Merged
andrew-s28 merged 1 commit into from
Mar 21, 2025
Merged

Adds salinity dependence to the saturation specific humidity calculation #39

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6 changes: 3 additions & 3 deletions pycoare/util.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import numpy as np
from numpy.typing import NDArray, ArrayLike
from numpy.typing import ArrayLike, NDArray


def grv(lat: ArrayLike) -> NDArray[np.float64]:
Expand Down Expand Up @@ -63,7 +63,7 @@ def qsat(t: ArrayLike, p: ArrayLike) -> NDArray[np.float64]:
return es


def qsea(t: ArrayLike, p: ArrayLike) -> NDArray[np.float64]:
def qsea(t: ArrayLike, p: ArrayLike, s: ArrayLike = 35) -> NDArray[np.float64]:
"""Returns saturation specific humidity at sea surface from temperature and pressure.

:param t: temperature (degC)
Expand All @@ -74,7 +74,7 @@ def qsea(t: ArrayLike, p: ArrayLike) -> NDArray[np.float64]:
:rtype: NDArray[np.float64]
"""
ex = qsat(t, p) # returns ex as ndarray float
es = 0.98 * ex
es = (1 - 0.02 * s / 35) * ex
qs = 622 * es / (p - 0.378 * es)
return qs

Expand Down