Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
권호 표지

Evapotranspiration from a Deciduous Forest in a Complex Terrain and a Heterogeneous Farmland Under Monsoon Climate

Kang, Min-Seok;Park, Sung-Bin;Kwon, Hyo-Jung;Choi, Hyung-Tae;Choi, Young-Jean;Kim, Joon

  • Published : 20090300
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Abstract

Evapotranspiration (ET) was measured by eddy covariance method in two key ecosystems in Korea: (1) the Gwangneung site (a deciduous forest in a complex terrain located in the central north - part of the Korean Peninsula, GDK) and (2) the Haenam site (a heterogeneous farmland located in the west-central part of the Korean Peninsula, HFK). By using the multi-year observations (GDK: 2005~2007, HFK: 2004~2006), we quantified ET and analyzed its temporal variations and controlmechanisms based on the radiatively coupled combination equation. During the study period, the averaged annual precipitation was about 1500 mm for both sites, of which 1/4 returned to the atmosphere as ET at the GDK. At the HFK site, annual ET averaged 623 mm, which was 41%of the annual rainfall. Both sites showed a characteristic seasonality withmid-season depressions in ET that are associated with the reduced amount of available energy during the monsoon season. The decoupling parameter (${\Omega}^*$)), which indicates the measure of interaction between vegetation and the atmosphere, averaged 0.37 for the GDK site and 0.50 for the HFK site during the growing season. The ET from the HFK site was equally contributed by both equilibrium ET and imposed ET, whereas the GDK site was to some extent more influenced by imposed ET (hence, air saturation deficit and surface conductance).

Keywords

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