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Rainfall Retrievals Over West Africa Using Seviri: Evaluation with Trmm-pr and Monitoring of the Daylight Time Monsoon Progression : Volume 7, Issue 4 (27/08/2010)

By Wolters, E. L. A.

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Book Id: WPLBN0004012651
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Rainfall Retrievals Over West Africa Using Seviri: Evaluation with Trmm-pr and Monitoring of the Daylight Time Monsoon Progression : Volume 7, Issue 4 (27/08/2010)  
Author: Wolters, E. L. A.
Volume: Vol. 7, Issue 4
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Roebeling, R. A., J. M. Van Den Hur, B. J., & A. Wolter, E. L. (2010). Rainfall Retrievals Over West Africa Using Seviri: Evaluation with Trmm-pr and Monitoring of the Daylight Time Monsoon Progression : Volume 7, Issue 4 (27/08/2010). Retrieved from http://www.ebooklibrary.org/


Description
Description: Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE De Bilt, The Netherlands. This paper describes the application of the KNMI cloud physical properties – precipitation properties (CPP-PP) algorithm over West Africa. The algorithm combines condensed water path (CWP), cloud phase (CPH), cloud particle effective radius (re), and cloud-top temperature (CTT) information, retrieved from visible, near-infrared and infrared observations of the Spinning Enhanced Visible and Infrared Imager (SEVIRI) onboard Meteosat-9 to estimate precipitation occurrence and intensity. It is investigated whether the CPP-PP algorithm is capable of retrieving rain occurrence and intensity over West Africa with a sufficient accuracy, using tropical monsoon measurement mission precipitation radar (TRMM-PR) and a small number of rain gauge observations as reference. As a second goal, it is assessed whether SEVIRI is capable of monitoring both the seasonal and synoptical evolution of the West African monsoon (WAM). It is shown that the SEVIRI-detected rainfall area agrees well with TRMM-PR, having a correlation coefficient of 0.86, with the areal extent of rainfall by SEVIRI being ~10% larger than TRMM-PR. The mean retrieved rain rate from CPP-PP is about 8% higher than from TRMM-PR. The frequency distributions of rain rate reveal that the median rain rates of CPP-PP and TRMM-PR are similar. However, rain rates >7 mm h−1 are retrieved more frequently by SEVIRI than by TRMM-PR, which is partly explained by known biases in TRMM-PR. Finally, it is illustrated that both the seasonal and synoptical time scale of the WAM can be well detected from SEVIRI daytime observations. It was found that the daytime westward MCS travel speed fluctuates between 50 and 60 km h−1. Furthermore, the ratio of MCS precipitation to the total precipitation was estimated to be about 27%. Our results indicate that rainfall retrievals from SEVIRI can be used to monitor the West African monsoon.

Summary
Rainfall retrievals over West Africa using SEVIRI: evaluation with TRMM-PR and monitoring of the daylight time monsoon progression

Excerpt
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