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Ice polar stratospheric clouds detected from assimilation of Atmospheric Infrared Sounder data
Author(s) -
Stajner Ivanka,
Benson Craig,
Liu HuiChun,
Pawson Steven,
Brubaker Nicole,
Chang LangPing,
Riishojgaard Lars Peter,
Todling Ricardo
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl029415
Subject(s) - atmospheric infrared sounder , environmental science , polar , occultation , atmospheric sciences , data assimilation , remote sensing , brightness , stratosphere , ice cloud , tropopause , meteorology , troposphere , satellite , geology , physics , optics , astronomy
A novel technique is presented for the detection and mapping of ice polar stratospheric clouds (PSCs), using brightness temperatures from the Atmospheric Infrared Sounder (AIRS) “moisture” channel near 6.79 μ m. It is based on observed‐minus‐forecast residuals (O‐Fs) computed when using AIRS radiances in the Goddard Earth Observing System version 5 (GEOS‐5) data assimilation system. Brightness temperatures are computed from six‐hour GEOS‐5 forecasts using a radiation transfer module under clear‐sky conditions, meaning they will be too high when ice PSCs are present. We study whether the O‐Fs contain quantitative information about PSCs by comparison with sparse data from the Polar Ozone and Aerosol Measurement (POAM) III solar occultation instrument. AIRS O‐Fs lower than −2 K generally coincide with PSCs observed by POAM III. Synoptic maps of AIRS O‐Fs lower than −2 K are constructed as a proxy for ice PSCs. These are used to investigate spatio‐temporal variations of Antarctic PSCs in the year 2004.