Atmospheric parameters in a subtropical cloud regime transition derived by AIRS and MODIS: observed statistical variability compared to ERA-Interim
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2014
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Abstract
Cloud occurrence, microphysical and optical properties, and atmospheric
profiles within a subtropical cloud regime transition in the northeastern
Pacific Ocean are obtained from a synergistic combination of the Atmospheric
Infrared Sounder (AIRS) and the MODerate resolution Imaging
Spectroradiometer (MODIS). The observed cloud parameters and atmospheric
thermodynamic profile retrievals are binned by cloud type and analyzed based
on their probability density functions (PDFs). Comparison of the PDFs to
data from the European Centre for Medium Range Weather Forecasting
reanalysis (ERA-Interim) shows a strong difference in the occurrence of the
different cloud types compared to clear sky. An increasing non-Gaussian
behavior is observed in cloud optical thickness (τc), effective
radius (re) and cloud-top temperature (Tc) distributions from
stratocumulus to trade cumulus, while decreasing values of lower-tropospheric stability are seen. However, variations in the mean, width and
shape of the distributions are found. The AIRS potential temperature
(θ) and water vapor (q) profiles in the presence of varying marine
boundary layer (MBL) cloud types show overall similarities to the
ERA-Interim in the mean profiles, but differences arise in the higher
moments at some altitudes. The differences between the PDFs from
AIRS+MODIS and ERA-Interim make it possible to pinpoint systematic errors
in both systems and help to understand joint PDFs of cloud properties and
coincident thermodynamic profiles from satellite observations.
| Reference Key |
schreier2014atmosphericatmospheric
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| Authors | Schreier, M. M.;Kahn, B. H.;Sušelj, K.;Karlsson, J.;Ou, S. C.;Yue, Q.;Nasiri, S. L.; |
| Journal | atmospheric chemistry and physics |
| Year | 2014 |
| DOI |
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