Journal
JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY
Volume 57, Issue 4, Pages 821-836Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JAMC-D-17-0157.1
Keywords
Precipitation; Cloud microphysics; Remote sensing; Satellite observations
Categories
Funding
- Master and Doctor Fund of Anhui Meteorological Bureau [RC201701]
- NSFC [41675041, 4123041, 91337213]
- Special Funds for Public Welfare of China [GYHY201306077]
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Utilizing the cloud parameters derived from the Tropical Rainfall Measuring Mission (TRMM) Visible and Infrared Scanner and the near-surface rainfall detected by the TRMM Precipitation Radar, the differences of cloud parameters for precipitating clouds (PCs) and nonprecipitating clouds (NPCs) are examined in tropical cyclones (TCs) during daytime from June to September 1998-2010. A precipitation delineation scheme that is based on cloud parameter thresholds is proposed and validated using the independent TC datasets in 2011 and observational datasets from Terra/MODIS. Statistical analysis of these results shows that the differences in the effective radius of cloud particles R-e are small for PCs and NPCs, while thick clouds with large cloud optical thickness (COT) and liquid water path (LWP) can be considered as candidates for PCs. The probability of precipitation increases rapidly as the LWP and COT increase, reaching similar to 90%, whereas the probability of precipitation reaches a peak value of only 30% as R-e increases. The combined threshold of a brightness temperature at 10.8 m (BT4) of 270 K and an LWP of 750 g m(-2) shows the best performance for precipitation discrimination at the pixel levels, with the probability of detection (POD) reaching 68.2% and false-alarm ratio (FAR) reaching 31.54%. From MODIS observations, the composite scheme utilizing BT4 and LWP also proves to be a good index, with POD reaching 77.39% and FAR reaching 24.2%. The results from this study demonstrate a potential application of real-time precipitation monitoring in TCs utilizing cloud parameters from visible and infrared measurements on board geostationary weather satellites.
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