Open AccessHIRDLS and CALIPSO observations of tropical cirrus
Author(s) -
Massie Steven T.,
Gille John,
Craig Cheryl,
Khosravi Rashid,
Barnett John,
Read William,
Winker David
Publication year - 2010
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2009jd012100
Subject(s) - cirrus , lidar , environmental science , troposphere , atmospheric sciences , microwave limb sounder , outgoing longwave radiation , cloud top , climatology , satellite , latitude , meteorology , remote sensing , geology , geography , convection , physics , geodesy , astronomy
High Resolution Dynamics Limb Sounder (HIRDLS) and Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) measurements of cirrus frequency of occurrence in the upper tropical troposphere are quantified for September 2006 to August 2007. Monthly geospatial averages of cloud frequency of occurrence between 90 and 177 hPa are similar and correlate well with Microwave Limb Sounder (MLS) relative humidity with respect to ice (RHI) data, though clouds are present at individual RHI values less than 100%, due to the 5, 1, and sub‐1 km vertical resolutions of the MLS, HIRDLS, and CALIPSO experiments. Seasonal variations in cloud frequency of occurrence are similar, with largest frequencies during winter (December–February). Though the CALIPSO and HIRDLS experiments employ nadir‐ and limb‐viewing observational geometries, respectively, CALIPSO horizontal scales of cirrus are frequently larger than 100 km, and therefore similarities are present in the geospatial distributions of cloud occurrence. Isolated laminar cirrus is most prevalent away from the equator. The monthly patterns of HIRDLS and CALIPSO cloud occurrence are archived for useful comparisons to climate models.