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High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes

Satellite precipitation products are becoming increasingly useful to complement rain gauge networks in regions where these are too sparse to capture spatial precipitation patterns, such as in the Tropical Andes. The Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (TPR) was active for...

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Main Authors: Manz, Bastian, Buytaert, Wouter, Zulkafli, Zed Diyana, Lavado, Waldo, Willems, Bram, Robles, Luis Alberto, Rodriguez-Sanchez, Juan-Pablo
Format: Article
Language:English
Published: AGU Publications 2016
Online Access:http://psasir.upm.edu.my/id/eprint/47491/1/High-resolution%20satellite-gauge%20merged%20precipitation%20climatologies%20of%20the%20Tropical%20Andes.pdf
http://psasir.upm.edu.my/id/eprint/47491/
http://onlinelibrary.wiley.com/wol1/doi/10.1002/2015JD023788/abstract
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spelling my.upm.eprints.474912016-05-20T02:06:12Z http://psasir.upm.edu.my/id/eprint/47491/ High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes Manz, Bastian Buytaert, Wouter Zulkafli, Zed Diyana Lavado, Waldo Willems, Bram Robles, Luis Alberto Rodriguez-Sanchez, Juan-Pablo Satellite precipitation products are becoming increasingly useful to complement rain gauge networks in regions where these are too sparse to capture spatial precipitation patterns, such as in the Tropical Andes. The Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (TPR) was active for 17 years (1998–2014) and has generated one of the longest single-sensor, high-resolution, and high-accuracy rainfall records. In this study, high-resolution (5 km) gridded mean monthly climatological precipitation is derived from the raw orbital TPR data (TRMM 2A25) and merged with 723 rain gauges using multiple satellite-gauge (S-G) merging approaches. The resulting precipitation products are evaluated by cross validation and catchment water balances (runoff ratios) for 50 catchments across the Tropical Andes. Results show that the TPR captures major synoptic and seasonal precipitation patterns and also accurately defines orographic gradients but underestimates absolute monthly rainfall rates. The S-G merged products presented in this study constitute an improved source of climatological rainfall data, outperforming the gridded TPR product as well as a rain gauge-only product based on ordinary Kriging. Among the S-G merging methods, performance of inverse distance interpolation of satellite-gauge residuals was similar to that of geostatistical methods, which were more sensitive to gauge network density. High uncertainty and low performance of the merged precipitation products predominantly affected regions with low and intermittent precipitation regimes (e.g., Peruvian Pacific coast) and is likely linked to the low TPR sampling frequency. All S-G merged products presented in this study are available in the public domain. AGU Publications 2016-02 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/47491/1/High-resolution%20satellite-gauge%20merged%20precipitation%20climatologies%20of%20the%20Tropical%20Andes.pdf Manz, Bastian and Buytaert, Wouter and Zulkafli, Zed Diyana and Lavado, Waldo and Willems, Bram and Robles, Luis Alberto and Rodriguez-Sanchez, Juan-Pablo (2016) High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes. Journal of Geophysical Research: Atmospheres, 121 (3). pp. 1190-1207. ISSN 2169-897X; ESSN: 2169-8996 http://onlinelibrary.wiley.com/wol1/doi/10.1002/2015JD023788/abstract 10.1002/2015JD023788
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Satellite precipitation products are becoming increasingly useful to complement rain gauge networks in regions where these are too sparse to capture spatial precipitation patterns, such as in the Tropical Andes. The Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (TPR) was active for 17 years (1998–2014) and has generated one of the longest single-sensor, high-resolution, and high-accuracy rainfall records. In this study, high-resolution (5 km) gridded mean monthly climatological precipitation is derived from the raw orbital TPR data (TRMM 2A25) and merged with 723 rain gauges using multiple satellite-gauge (S-G) merging approaches. The resulting precipitation products are evaluated by cross validation and catchment water balances (runoff ratios) for 50 catchments across the Tropical Andes. Results show that the TPR captures major synoptic and seasonal precipitation patterns and also accurately defines orographic gradients but underestimates absolute monthly rainfall rates. The S-G merged products presented in this study constitute an improved source of climatological rainfall data, outperforming the gridded TPR product as well as a rain gauge-only product based on ordinary Kriging. Among the S-G merging methods, performance of inverse distance interpolation of satellite-gauge residuals was similar to that of geostatistical methods, which were more sensitive to gauge network density. High uncertainty and low performance of the merged precipitation products predominantly affected regions with low and intermittent precipitation regimes (e.g., Peruvian Pacific coast) and is likely linked to the low TPR sampling frequency. All S-G merged products presented in this study are available in the public domain.
format Article
author Manz, Bastian
Buytaert, Wouter
Zulkafli, Zed Diyana
Lavado, Waldo
Willems, Bram
Robles, Luis Alberto
Rodriguez-Sanchez, Juan-Pablo
spellingShingle Manz, Bastian
Buytaert, Wouter
Zulkafli, Zed Diyana
Lavado, Waldo
Willems, Bram
Robles, Luis Alberto
Rodriguez-Sanchez, Juan-Pablo
High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes
author_facet Manz, Bastian
Buytaert, Wouter
Zulkafli, Zed Diyana
Lavado, Waldo
Willems, Bram
Robles, Luis Alberto
Rodriguez-Sanchez, Juan-Pablo
author_sort Manz, Bastian
title High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes
title_short High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes
title_full High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes
title_fullStr High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes
title_full_unstemmed High-resolution satellite-gauge merged precipitation climatologies of the Tropical Andes
title_sort high-resolution satellite-gauge merged precipitation climatologies of the tropical andes
publisher AGU Publications
publishDate 2016
url http://psasir.upm.edu.my/id/eprint/47491/1/High-resolution%20satellite-gauge%20merged%20precipitation%20climatologies%20of%20the%20Tropical%20Andes.pdf
http://psasir.upm.edu.my/id/eprint/47491/
http://onlinelibrary.wiley.com/wol1/doi/10.1002/2015JD023788/abstract
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score 13.211869

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