Performance evaluation of satellite precipitation estimation with ground monitoring stations over southern Himalayas in Bhutan

• Autorzy: Adhikari Kirtan , Choden Yeshi , Cheki Tshering , Gurung Lily , Denka Tshering , Gupta Vivek

Identyfikatory

DOI

10.1007/s11600-020-00434-z

• Języki publikacji: EN

Abstrakty

EN

High-resolution remote sensing-based hydro-meteorological data products are being increasingly used for various scientifc studies throughout the world. As such, it is important to evaluate the quality of the data retrieved by the means of remotesensing especially for the regions characterized by the drastic variation of topography such as the Himalayas. This work focuses on the comparison and evaluation of the Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA–3B43v7) with point-based ground observations recorded by Department of Hydro-Met Services (DHMS) in Bhutan. For this study, 32 rain gauge stations over Southern Himalayas in Bhutan (SHB) were selected and precipitation data for a period of 19 years (from 1998 to 2017) were compared with the TRMM precipitation product. The comparison revealed that the coefcient of correlation between satellite data and ground observation is statistically signifcant at a 95% confdence level. Furthermore, the coefcient of correlation is near unity in some stations and an average of 0.814 over the entire SHB region for 19 years. This fnding imparts that the TRMM can capture the rainfall trend over the SHB. As per the fndings, the average root-mean-square error was 219.1 mm per month considering the entire duration and 344.7 mm per month considering only the rainy season. Similarly, the average Bias was computed at 0.27 for all seasons and 0.32 for the rainy season, indicating TRMM underestimates the precipitation over SHB. The satellite estimate provides a piece of good information on the distribution of rainfall over the SHB. Nevertheless, it is still advisable to correct the bias of the satellite product, as the relative root-mean-square error is larger than 50% for 96% of the evaluated stations.

Słowa kluczowe

EN

Southern Himalayas of Bhutan; satellite images; statistical analysis; tropical rainfall measuring mission; TRMM; SHB; root mean square error; RSME

PL

Południowe Himalaje Bhutanu; zdjęcia satelitarne; analiza statystyczna

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2020
• Tom: Vol. 68, no. 3
• Strony: 933--943
• Opis fizyczny: Bibliogr. 28 poz.

Twórcy

autor

Adhikari Kirtan

• College of Science and Technology, Royal University of Bhutan, Thimphu, Bhutan

autor

Choden Yeshi

• College of Science and Technology, Royal University of Bhutan, Thimphu, Bhutan

autor

Cheki Tshering

• College of Science and Technology, Royal University of Bhutan, Thimphu, Bhutan

autor

Gurung Lily

• College of Science and Technology, Royal University of Bhutan, Thimphu, Bhutan

autor

Denka Tshering

• College of Science and Technology, Royal University of Bhutan, Thimphu, Bhutan

autor

Gupta Vivek

• Department of Hydrology, Indian Institute of Technology Roorkee, Roorkee, India

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)