Long-term analysis of evapotranspiration over a diverse land use area in northern Thailand
Wonsik Kim1, Daisuke Komori2, Jaeil Cho3, Shinjiro Kanae4 and Taikan Oki5
1National Institute for Agro-Environmental Sciences, Japan
2Tohoku University, Japan
3Pukyong National University, Republic of Korea
4Tokyo Institute of Technology, Japan
5The University of Tokyo, Japan
Abstract:
Evapotranspiration (ET) over a diverse land use area in northern Thailand was successfully estimated by long-term eddy covariance measurements. Some measurement gaps due to instrumentation problems and administrative difficulties were unavoidable. Monthly ET trends revealed a maximum of 150 ± 10 mm in June and a minimum of 60 ± 10 mm in January. The annual mean ET was estimated to be 1300 ± 140 mm. The interannual variation in ET reflects the response of the land surface to meteorological events and land use/cover changes (LUCC); however, the effect of rainfall variation on ET was greater than that of LUCC. Effective heterogeneity was evaluated using the Bowen ratio; such information will be useful for understanding the effect of land surface heterogeneity on latent and sensible heat fluxes.
KEYWORDS Bowen ratio; evapotranspiration; effective heterogeneity; land use/cover change; northern Thailand
Hydrological Research Letters 8(1), 45–50 (2014)
Published online in J-STAGE (www.jstage.jst.go.jp/browse/hrl). DOI: 10.3178/hrl.8.45
