Spatial variations in evapotranspiration over East Asian forest sites. I. Evapotranspiration and decoupling coefficient
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- Khatun Rehana
- Graduate School of Bioagricultural Sciences, Nagoya University
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- Ohta Takeshi
- Graduate School of Bioagricultural Sciences, Nagoya University
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- Kotani Ayumi
- Graduate School of Bioagricultural Sciences, Nagoya University
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- Asanuma Jun
- Terrestrial Environment Research Center, Tsukuba University
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- Gamo Minoru
- National Institute of Advanced Industrial Science and Technology
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- Han Shijie
- Institute of Applied Ecology, Chinese Academy of Sciences
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- Hirano Takashi
- Graduate School of Agriculture, Hokkaido University
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- Nakai Yuichiro
- Forestry and Forest Products Research Institute
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- Saigusa Nobuko
- National Institute for Environmental Studies
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- Takagi Kentaro
- Field Science Center for Northern Biosphere, Hokkaido University
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- Wang Huimin
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences
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- Yoshifuji Natsuko
- Graduate School of Agriculture, Kyoto University
説明
Evapotranspiration (ET) is not only a vital component of water budget, but also plays an important role in the energy budget of the earth-atmospheric system, ultimately driving many regional and global scale climatological processes. This paper describes the ET characteristics and factors controlling ET across the 17 forest sites in East Asia (2°S to 64°N latitude). ET was measured using the eddy covariance technique at each site. Daytime dry-canopy data for the growing season were used in this study. Growing season mean ET gradually decreased as latitude increased, with a range of 4.4 to 1.2 mm d−1. The growing season mean decoupling coefficient (Ω) ranged from 0.42 to 0.11 across the studied sites. At low-latitude forest sites, Ω was close to 0.50, indicating that the bulk surface was partially decoupled from the atmosphere and ET was strongly controlled by net radiation and vapour pressure deficit. At high-latitude forest sites, Ω was low (∼0.12), indicating that the bulk surface was well coupled to the atmosphere and ET was mainly controlled by surface conductance. The value of Ω was determined mainly by the ratio of aerodynamic conductance to surface conductance across the studied forests of East Asia.<br>
収録刊行物
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- Hydrological Research Letters
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Hydrological Research Letters 5 83-87, 2011
水文・水資源学会／日本地下水学会／日本水文科学会／陸水物理研究会
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詳細情報 詳細情報について
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- CRID
- 1390282680265460736
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- NII論文ID
- 130002125899
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- DOI
- 10.3178/hrl.5.83
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- ISSN
- 18823416
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可