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Include density correction in SL axis in globalStats #721

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Include density correction in SL axis in globalStats #721

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ce8d86b
Account for freshwater density when calculating sea-level equivalent
matthewhoffman May 12, 2026
39cfc31
add variables for ocean area and m to mm constants
matthewhoffman May 12, 2026
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15 changes: 12 additions & 3 deletions landice/output_processing_li/plot_globalStats.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,10 @@
import textwrap

rhoi = 910.0
rhosw = 1028.
rhosw = 1028.0
rhofw = 1000.0
Aocn = 3.625e14 # m^2 (Gregory et al. 2019)
m_to_mm = 1000.0

print("** Gathering information. (Invoke with --help for more details. All arguments are optional)")
parser = ArgumentParser(description=__doc__)
Expand Down Expand Up @@ -188,10 +191,16 @@


def VAF2seaLevel(vol):
return vol / scaleVol / 3.62e14 * rhoi / rhosw * 1000.
"""
This function accounts for the fact that ice, when melted,
takes on freshwater density. This density correction is only
applied to the volume above flotation, when in reality, it should
be applied for all melted ice.
"""
return vol / scaleVol / Aocn * rhoi / rhofw * m_to_mm

def seaLevel2VAF(vol):
return vol * scaleVol * 3.62e14 * rhosw / rhoi / 1000.
return vol * scaleVol * Aocn * rhofw / rhoi / m_to_mm

def addSeaLevAx(axName):
seaLevAx = axName.secondary_yaxis('right', functions=(VAF2seaLevel, seaLevel2VAF))
Expand Down