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A Study of Diurnal Variation of OLR from the GOES Sounder

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  • 1 Cooperative Institute for Climate Studies, University of Maryland at College Park, College Park, Maryland
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Abstract

A multispectral outgoing longwave radiation (OLR) estimation technique is applied to GOES Sounder data to study the diurnal cycle of OLR. OLR data collected from several regional areas over the continental United States and adjacent oceans during July 1998 are analyzed to determine diurnal variations for clear-sky and all-sky conditions. It is found that the desert regions exhibit a diurnal range that can reach up to about 70 W m−2 while the vegetated areas and ocean regions exhibit much lower diurnal range. The results for this one month show that the form of the monthly diurnal variation of the different regions can be approximated with a sine-like function, with the desert sites exhibiting a more nearly perfect sine curve. It is also found that the rms errors associated with sparse data such as those of polar orbiting satellites depend on sampling time and interval. The high temporal and spatial characteristics of OLR data from geostationary satellites offer a unique opportunity to obtain increased understanding of the diurnal cycles of atmospheric processes.

Current affiliation: Department of Meteorology, the Florida State University, Tallahassee, Florida

+ Current affiliation: Raytheon ITSS, Lanham, Maryland

Corresponding author address: Dr. R. G. Ellingson, Department of Meteorology, Room 404 Love Building, The Florida State University, Tallahassee, FL 32306. Email: bobe@met.fsu.edu

Abstract

A multispectral outgoing longwave radiation (OLR) estimation technique is applied to GOES Sounder data to study the diurnal cycle of OLR. OLR data collected from several regional areas over the continental United States and adjacent oceans during July 1998 are analyzed to determine diurnal variations for clear-sky and all-sky conditions. It is found that the desert regions exhibit a diurnal range that can reach up to about 70 W m−2 while the vegetated areas and ocean regions exhibit much lower diurnal range. The results for this one month show that the form of the monthly diurnal variation of the different regions can be approximated with a sine-like function, with the desert sites exhibiting a more nearly perfect sine curve. It is also found that the rms errors associated with sparse data such as those of polar orbiting satellites depend on sampling time and interval. The high temporal and spatial characteristics of OLR data from geostationary satellites offer a unique opportunity to obtain increased understanding of the diurnal cycles of atmospheric processes.

Current affiliation: Department of Meteorology, the Florida State University, Tallahassee, Florida

+ Current affiliation: Raytheon ITSS, Lanham, Maryland

Corresponding author address: Dr. R. G. Ellingson, Department of Meteorology, Room 404 Love Building, The Florida State University, Tallahassee, FL 32306. Email: bobe@met.fsu.edu

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