edu.ucar.opensky::articles:17066 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T14:56:24.442335 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7db833x HIRDLS and CALIPSO observations of tropical cirrus 2010-01-30T00:00:00Z publication https://n2t.org/ark:/85065/d7db833x https://doi.org/10.1029/2009JD012100 Massie, Steven T. author Gille, John author Craig, Cheryl A. author Khosravi, Rashid author Barnett, J. author Read, W. author Winker, D. author UCAR/NCAR - Library publisher 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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication An edited version of this paper was published by AGU. Copyright 2010 American Geophysical Union. None eng geoscientificInformation