subgrid-scale variability in clear-sky relative humidity and forcing by aerosol–radiation interactions in an atmosphere model
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2018
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Abstract
Atmosphere models with resolutions of several tens of kilometres take
subgrid-scale variability in the total specific humidity qt into account
by using a uniform probability density function (PDF) to predict fractional
cloud cover. However, usually only mean relative humidity,
RH, or mean clear-sky relative humidity,
RHcls, is used to compute hygroscopic growth
of soluble aerosol particles. While previous studies based on limited-area
models and also a global model suggest that subgrid-scale variability in RH
should be taken into account for estimating radiative forcing due to aerosol–radiation
interactions (RFari), here we present the first
estimate of RFari using a global atmospheric model with a parameterization
for subgrid-scale variability in RH that is consistent with the assumptions
in the model. For this, we sample the subsaturated part of the uniform RH-PDF
from the cloud cover scheme for its application in the hygroscopic growth
parameterization in the ECHAM6-HAM2 atmosphere model. Due to the non-linear
dependence of the hygroscopic growth on RH, this causes an increase in
aerosol hygroscopic growth. Aerosol optical depth (AOD) increases by a global
mean of 0.009 ( ∼ 7.8 % in comparison to the control run). Especially
over the tropics AOD is enhanced with a mean of about 0.013. Due to the
increase in AOD, net top of the atmosphere clear-sky solar radiation,
SWnet, cls, decreases by −0.22 W m−2
( ∼ −0.08 %). Finally, the RFari changes from −0.15 to
−0.19 W m−2 by about 31 %. The reason for this very
disproportionate effect is that anthropogenic aerosols are disproportionally
hygroscopic.
| Reference Key |
petersik2018atmosphericsubgrid-scale
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|---|---|
| Authors | ;P. Petersik;M. Salzmann;J. Kretzschmar;R. Cherian;D. Mewes;J. Quaas |
| Journal | Journal of agricultural and food chemistry |
| Year | 2018 |
| DOI |
10.5194/acp-18-8589-2018
|
| URL | |
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