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Remote Sens. 2016, 8(1), 8; doi:10.3390/rs8010008

Optical Thickness and Effective Radius Retrievals of Low Stratus and Fog from MTSAT Daytime Data as a Prerequisite for Yellow Sea Fog Detection

1
Physical Oceanography Laboratory, Ocean–Atmosphere Interaction and Climate Laboratory, Ocean University of China, Qingdao 266100, China
2
Laboratory for Climatology and Remote Sensing, Faculty of Geography, Philipps-University of Marburg, Deutschhausstr. 12, D-35032 Marburg, Germany
3
Qingdao Meteorological Bureau, Qingdao 266003, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Alexander A. Kokhanovsky and Prasad S. Thenkabail
Received: 30 September 2015 / Revised: 30 October 2015 / Accepted: 24 November 2015 / Published: 22 December 2015
(This article belongs to the Special Issue Aerosol and Cloud Remote Sensing)
View Full-Text   |   Download PDF [3689 KB, uploaded 22 December 2015]   |  

Abstract

Operational nowcasting techniques for sea fog over the Yellow Sea rely on data from weather satellites because ground-based observations are hardly available. While there are several algorithms for detecting low stratus (LST) that are applicable to geostationary weather satellite data, sea fog retrieval is more complicated. These schemes mostly need ancillary data such as Cloud Optical Thickness (COT) and Droplet Effective Radius (DER). To retrieve the necessary parameters for sea fog detection over the Yellow Sea, the Comprehensive Analysis Program for Cloud Optical Measurement (CAPCOM) scheme developed by Kawamoto et al. (2001) was adapted to the Japanese Multifunctional Transport Satellites (MTSAT) system-Japanese Advanced Meteorological Imager (JAMI). COT and DER values were then retrieved for 64 cases over the Yellow Sea (= 85,000 LST pixels) and compared with the COT and DER products from the MYD06/MOD06, CAPCOM-MODIS (Moderate Resolution Imaging Spectroradiometer) and CloudSat (cloud radar). Results showed that the COT and DER values retrieved from JAMI were satisfactory. The MTSAT-2 JAMI data delivered better COT values than the MTSAT-1R JAMI data, due to the re-calibration of MTSAT-2 JAMI’s visible (VIS) band in 2011. Similarly, improvements were seen in DER retrieval, even though the VIS re-calibration primarily affects COT retrieval. By comparing the difference in stratus thickness calculated by MTSAT-1R and MTSAT-2, the COT and DER retrieved from MTSAT-2 JAMI can be used in ground fog retrieval schemes. These values exhibit less bias, especially in cases involving high cloud top and thin cloud thickness. Both the COT and DER retrievals from MTSAT-2 JAMI offer potential as reliable parameters for Yellow Sea fog detection. View Full-Text
Keywords: MTSAT; Yellow Sea; fog; low stratus; optical thickness; droplet effective radius MTSAT; Yellow Sea; fog; low stratus; optical thickness; droplet effective radius
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MDPI and ACS Style

Yi, L.; Thies, B.; Zhang, S.; Shi, X.; Bendix, J. Optical Thickness and Effective Radius Retrievals of Low Stratus and Fog from MTSAT Daytime Data as a Prerequisite for Yellow Sea Fog Detection. Remote Sens. 2016, 8, 8.

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