Evaluation of the GCOM-C global ET_index estimation algorithm

• TASUMI Masahiro

  Department of Forest and Environmental Sciences, Faculty of Agriculture, University of Miyazaki

• MORIYAMA Masao

  Graduate School of Engineering, Nagasaki University

• HIRAKAWA Kiyomi

  Kokusai Kogyo Co. Ltd.

• FUJII Aiko

  PASCO CORPORATION

Bibliographic Information

Other Title

• Evaluation of the GCOM-C global ETindex estimation algorithm

Abstract

　This paper presents the application results of the Global Change Observation Mission-Climate (GCOM-C) global ET_index estimation algorithm to the entire globe over the seven years from 2001 to 2007 using MODIS daily thermal observation data as a substitute for GCOM-C thermal observation data. The GCOM-C global ET_index estimation algorithm was developed to automatically provide global ET_index information for the Global Change Observation Mission (GCOM) of the Japan Aerospace Exploration Agency (JAXA).<br>　The ET_index maps resulting from this study were compared with global precipitation, Köppen's climate classification, and forest distribution maps in order to investigate the general correspondence between the ET_index and climate/ecosystem distributions. The estimated ET_index was confirmed to be in general agreement with the distributions of climate and forest at the global and continental scales and at annual and seasonal timescales.<br>　The resultant global evapotranspiration (ET) maps were evaluated using point-measured precipitation for 199 locations worldwide and measured ET data in Mongolia. The relationship between precipitation and ET supported the adequacy of the ET estimation method for annual timescales. A monthly comparison of the ET_index with precipitation implied that the algorithm is functional in summer but nonfunctional in winter under some conditions. An accuracy assessment of the algorithm using actual ET measurement data from Mongolia indicated that the algorithm showed good performance at annual timescales. The error in the 4-year average of estimated ET was equivalent to 12% of the actual ET or 0.7% of the reference ET.

Journal

• Journal of Agricultural Meteorology

  Journal of Agricultural Meteorology 72 (3-4), 151-158, 2016

  The Society of Agricultural Meteorology of Japan

Keywords

• Crop coefficient
• Evapotranspiration
• GCOM-C
• Surface temperature
• Water management

Details

• CRID: 1390282679645708928
• NII Article ID: 40020932820
• NII Article ID: 130006847554
• NII Book ID: AN00200732
• DOI: 10.2480/agrmet.d-15-00023
• ISSN: 18810136
• ISSN: 00218588
• NDL BIB ID: 027599065
• Web Site: http://id.ndl.go.jp/bib/027599065
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027599065
• Web Site: https://www.jstage.jst.go.jp/article/agrmet/72/3-4/72_D-15-00023/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed