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TZUNTIL:20101031T010000Z
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DTSTAMP:20260820T034432Z
DESCRIPTION:Eingeladen durch Prof Foken Mikrometeorologie.Kun Yang\, Instit
 ute of Tibetan Plateau\, Chinese Academy of Sciences (yangk@itpcas.ac.cn)I
 n this talk\, I will cover the following activities\, which are being cond
 ucted at University of Tokyo and Institute of Tibetan Plateau: 1. On-going
  experiments. Current projects include Tibetan Observation and Research Pl
 atform (TORP)\, JICA China-Japan weather disaster project\, and CAMP-Tibet
  follow-up project. These experiments will be introduced briefly. 2. Evalu
 ation of surface radiation budget from remote sensing and surface energy b
 udget from a land data assimilation system. The Plateau harsh condition re
 presents an extreme of weather and climate and\, therefore\, the observati
 ons could be used to validate a scheme or a model’s universality. GEWEX-SR
 B (surface radiation budget) and ISCCP-FD (radiation flux data) as well as
  the latest University of Maryland SRB were evaluated\, and systematic err
 ors were detected. Furthermore\, the University of Tokyo microwave land da
 ta assimilation system was evaluated with observed surface energy budget a
 nd significant improvements are shown.3. Process studies. (1) Due to stron
 g solar heating\, there are very large ground-air temperature gradients ne
 ar noon. We developed a scheme to parameterize sensible heat fluxes for ve
 ry large ground-air temperature gradient and this scheme was widely evalua
 ted across China. (2) Soils beneath alpine meadows on the Plateau exhibit 
 a clear stratification: the topsoil has high soil organic matters and dens
 e roots and thus a small particle density and high porosity\, while the de
 ep soil is sand. We analyzed the topsoil and found a heat insulation effec
 t and high water potential in the topsoil. This soil stratification plays 
 a key role in surface water and energy budget and retard the response of f
 rozen soil to climate change. (3) PBL development and mountain-valley circ
 ulations. Given reliable surface heat fluxes\, we simulated the PBL develo
 pment. We showed the PBL can extend up to 3 km high. The interesting thing
  is that: the wind in the afternoon is downslope instead of upslope. This 
 downslope triggers convection and a raindrop evaporative cooling effect\, 
 which suppresses the further growing of PBL. 4. Extension to climate chang
 e studies. We tried to fill in the gap between experimental studies and cl
 imate change studies by combining high-resolution experimental data and lo
 w-resolution CMA (Chinese Meteorological Administration) data. Indeed\, we
  found experimental studies can contribute to our understanding of climati
 c trend of surface energy budget.
DTSTART;TZID=Europe/Berlin:20081016T170000
DTEND;TZID=Europe/Berlin:20081016T235959
LOCATION:H6
SUMMARY:Prof. Dr. Kun Yang\, Universität Tokyo und Chinesische Akademie der
  Wissenschaften: Tibetan experiments: Status\, data analysis\, and potenti
 al applications
TRANSP:TRANSPARENT
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