Estimation of the regional evaporative fraction over the Tibetan Plateau area by using Landsat-7 ETM data and the field observations

Y. Ma, M. Song, H. Ishikawa, K. Yang, T. Koike, L. Jia, M. Meneti, Z. Su

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

Abstract

This study proposed a parameterization methodology based on Landsat-7 ETM data and field observations and tested it for deriving an evaporative fraction (EF) over a heterogeneous landscape. As a case study, the methodology was applied to the experimental area of CAMP/Tibet located on the central Tibetan Plateau. Four scenes of Landsat-7 ETM data were used in the study. Scenes of 9 June 2002 and 28 August 2002 were selected as case examples of summer and autumn, respectively; the scene of 2 December 2002 was selected as a winter case; and 24 March 2003 was selected as a spring case (or pre-monsoon period). To validate the proposed methodology, the Landsat-7 ETM derived EFs were compared to ground-measured values in four different months that spanned a wide range of surface conditions and surface features. This comparison revealed that the predictions were in good accordance with the ground measurements with absolute percent differences of less than 9.5%. It was concluded that the proposed methodology successfully facilitates the retrieval of EF using Landsat-7 ETM data and field observations over the study area.
Original languageEnglish
Pages (from-to)295-309
JournalJournal of the Meteorological Society of Japan
Volume85A
DOIs
Publication statusPublished - 2007

Keywords

  • soil heat-flux
  • surface-energy balance
  • heterogeneous landscape
  • net-radiation
  • model
  • parameterization
  • game/tibet
  • profiles
  • length
  • budget

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