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contributor authorAckerman, S. A.
contributor authorHolz, R. E.
contributor authorFrey, R.
contributor authorEloranta, E. W.
contributor authorMaddux, B. C.
contributor authorMcGill, M.
date accessioned2017-06-09T16:20:31Z
date available2017-06-09T16:20:31Z
date copyright2008/07/01
date issued2008
identifier issn0739-0572
identifier otherams-66095.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207393
description abstractAn assessment of the performance of the Moderate Resolution Imaging Spectroradiometer (MODIS) cloud mask algorithm for Terra and Aqua satellites is presented. The MODIS cloud mask algorithm output is compared with lidar observations from ground [Arctic High-Spectral Resolution Lidar (AHSRL)], aircraft [Cloud Physics Lidar (CPL)], and satellite-borne [Geoscience Laser Altimeter System (GLAS)] platforms. The comparison with 3 yr of coincident observations of MODIS and combined radar and lidar cloud product from the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) site in Lamont, Oklahoma, indicates that the MODIS algorithm agrees with the lidar about 85% of the time. A comparison with the CPL and AHSRL indicates that the optical depth limitation of the MODIS cloud mask is approximately 0.4. While MODIS algorithm flags scenes with a cloud optical depth of 0.4 as cloudy, approximately 90% of the mislabeled scenes have optical depths less than 0.4. A comparison with the GLAS cloud dataset indicates that cloud detection in polar regions at night remains challenging with the passive infrared imager approach. In anticipation of comparisons with other satellite instruments, the sensitivity of the cloud mask algorithm to instrument characteristics (e.g., instantaneous field of view and viewing geometry) and thresholds is demonstrated. As expected, cloud amount generally increases with scan angle and instantaneous field of view (IFOV). Nadir sampling represents zonal monthly mean cloud amounts but can have large differences for regional studies when compared to full-swath-width analysis.
publisherAmerican Meteorological Society
titleCloud Detection with MODIS. Part II: Validation
typeJournal Paper
journal volume25
journal issue7
journal titleJournal of Atmospheric and Oceanic Technology
identifier doi10.1175/2007JTECHA1053.1
journal fristpage1073
journal lastpage1086
treeJournal of Atmospheric and Oceanic Technology:;2008:;volume( 025 ):;issue: 007
contenttypeFulltext


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