Abstracts for the 5th International GAME Conf.
3-5 October 2001
Aichi Trade Center
Nagoya Japan
On using LSMs to check the surface energy budget at the GAME/Tibet stations
Izuru Takayabu (1), Joon Kim (2), Kumiko Takata (3), Takeshi Yamazaki (4), Hirohiko Ishikawa (5), Osamu Tsukamoto (6)
(1) Meteorological Research Institute
(2) Yonsei univ.
(3) Frontier Research System for Global Change
(4) Tohoku univ.
(5) Kyoto univ.
(6) Okayama univ.
To examine the surface energy balance closure, we attempted to drive several LSMs such as JMA-SiB, New-SiB, SiB2, MATSIRO and TOHOKU models, using the GAME/Tibet IOP'98 data at Amdo and N-PAM sites. The duration of the simulation is about 3 months, including the summer monsoon season.
The LSMs succeeded to reproduce the characteristics of the summer monsoon such as (1) the increase of the soil wetness, (2) the increase of the evapotranspiration and (3) the decrease of the Bowen ratio.
We have checked the surface energy balance equation, i.e.,
H + lE
of the models against the observed values.
When we compared the right hand terms of the balance equation, with use of JMA-SiB model, we found that the daily values of modeled H (Hmodel) were between measured H (Hobs) and 3*Hobs. On the other hand, modeled lE (lEmodel) was almost same with measured lE (lEobs) on clear days. When it become cloudy, however, lEmodel > lEobs.
The eddy correlation method had low accuracy when adapted on the rainy condition. This may have resulted in lEmodel > lEobs on cloudy days including rain.
Here we attemt to compare the characteristics of each term of the surface energy balance equation in the above-mentioned LSMs and find out the reason for the difference between the observed and the simulated values.
Submittal Information
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Meteorological Research Institute | |
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1-1 Nagamine Tsukuba, Ibaraki, 305-0052, Japan | |
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