Abstracts for the 6th International GAME Conf.
3-5 December 2004
Kyoto Japan
Turbulent flux and the related observation at the Naqu super-site in Tibet.
ISHIKAWA, Hirohiko (1), TANAKA, Kenji (2), MA, Yaoming (3), LI, Maosheng (4)
(1) Disaster Prevention Research Institute, Kyoto University
(2) Kumamoto University
(3) Institute of Tibatan Plateau, Chinese Academy of Sciences
(4) Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences
Although plenty of turbulent flux data were obtained during the GAME/TIBET IOP in 1998 and analyzed in the following years, the data showed eflux imbalancef which casts another complexity in understanding the land-surface processes. Various sources of imbalance are considered such as the quality of turbulence data, especially of water vapor fluctuation, spatial homogeneity etc. From the summer of 2002, extensive flux observation has been continued at one of the GAME/Tibet flux site, BJ, located about 30 km to the southwest of the town of Naqu. The state-of-arts infrared open-path sensor is used to measure water vapor and carbon dioxide fluctuation. The measurements are conducted at two levels, 3m and 20m, from 2002 to the summer of 2003. After that, the 20m sensors have been working. The data are not fully continuous because of several troubles, they include severe winter season and the pre-monsoon season, when the GAME/TIBET IOP dataset in 1998 did not cover. In addition to the flux observation, continuous AWS observation with a 10 m tower is conducted. Further more, three small AWS are deployed surrounding the turbulence measurement and the main AWS observation, whose data are used to confirm the horizontal homogeneity.
The water vapor fluctuation is neatly measured both at 3m and 20m levels. The sigma_q/q* follows the similarity well. It is shown that the latent heat flux decrease abruptly for about two weeks in early October. It is also shown that the daytime sensible heat flux is considerably strong even in winter due to large temperature difference between the surface and the air. . The surface energy balance shows better closure than the former results. The turbulent fluxes are compared with the ones computed from AWS data in the conventional manner.
Submittal Information
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Disaster Prevention Research Institute, Kyoto Univ. | |
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Gokasho, Uji, Kyoto 611-0011 | |
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ishikawa@storm.dpri.kyoto-u.ac.jp | |