Accession Number:

ADA350759

Title:

Detection and Retrieval of Cirrus Cloud Systems Using AVHRR Data: Verification Based on Fire-II-IFO Composite Measurements

Descriptive Note:

Technical rept. 24-26 Oct 95

Corporate Author:

UTAH UNIV SALT LAKE CITY DEPT OF METEOROLOGY

Report Date:

1995-10-26

Pagination or Media Count:

8.0

Abstract:

We have developed a detection scheme to identify single and multilayer cirrus cloud systems based on the physical properties of the AVHRR Chs, 1-2 reflectances and ratios, the brightness temperature differences between Chs. 4 and 5, and the 4 brightness temperatures. Clear pixels are first separated from cloudy pixels which are then classified into three types cirrus, cirruslow cloud, and low cloud. This scheme has been applied to the NOAA satellite data collected over FIRE-II-IFO area, Kansas, during nine overpasses within seven observation dates November - December 1991. We have validated the detection results against cloudy conditions inferred from the collocated and coincident ground-based lidar and radar images, balloon-borne replicator data, and NCAR-CLASS humidity sounding a case-by-case basis. We show that the satellite detection results are considered with the cloudy conditions inferred from these independent and complementary measurements. We have also modified our retrieval scheme for the determination of cirrus optical depth and ice crystal size in multilayer cirrus cloud systems, case study using FIRE-II-IFO data is reported.

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE