Abstracts for the 5th International GAME Conf.
3-5 October 2001
Aichi Trade Center
Nagoya Japan
Simulation of seasonal variation of energy balance over a hill evergreen forest in northern Thailand with multi-layer model
Katsunori TANKA (1), H. TAKIZAWA (2), N. TANAKA (3), I. KOSAKA (2), N. YOSHIHUJI (3), C. TANTASIRIN (6), M. SUZUKI (3), N TANGTHAM (6)
(1) Frontier Research System for Global Change
(2) College of Bioresource Sciences, Nihon University
(3) Graduate School of Agricultural and Life Sciences, University of Tokyo
(6) Department of Conservation, Faculty of Forestry, Kasetsart University
Long-term observation has been carried out since February 1997 in evergreen forest in Northern Thailand, which is one of targeted areas in GEWEX (Global Energy and Water Cycle Experiment) Asian Monsoon Experiment. One of our study-aims is to clarify the energy cycle, in particular the distribution of radiant energy such as latent heat and sensible heat, over the surface. We have measured the basic meteorological variables such as air temperature, rainfall, downward short wave and long wave radiation. We obtained diurnal exchanges of sensible and latent heat for several days in 1998 and 1999 with an eddy correlation system. We applied a multi-layer model for latent and sensible heat, which takes account into processes of water budget on the leaf surfaces and rainfall interception, to the diurnal exchanges. Simulated values of latent and sensible heat reasonably agreed with measured ones. We could estimate the seasonal variation in energy balance for 2 years with obtained input-data - downward short wave and long wave radiation, wind velocity, air temperature and humidity. Estimated net radiation reasonably agreed with measured ones. The seasonal variation of sap flows of a few trees monitored by the heat pulse method in 1999 corresponded to that of simulated transpiration and supported the simulation result.
Submittal Information
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Frontier Research System for Global Change | |
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3173-25, Syouwa-tyou, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture 236-0001, Japan | |
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