Sensitivity of Land Surface Simulations to Model Physics, Land Characteristics, and Forcings, at Four CEOP Sites(<Special Issue>Coordinated Enhanced Observing Period(CEOP))

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概要

• 論文の詳細を見る

• Numerical land surface models (LSMs) are abundant and in many cases highly sophisticated, yet their output has not converged towards a consensus depiction of reality. Addressing this matter is complicated by the huge number of possible combinations of input land characteristics, forcings, and physics packages available. The Global Land Data Assimilation System (GLDAS) and its sister project the Land Information System (LIS) have made it straightforward to test a variety of configurations with multiple LSMs. In order to compare the impacts of the choice of LSM, land cover, soil, and elevation information, and precipitation and downward radiation forcing datasets on simulated evapotranspiration, sensible heat flux, and top layer soil moisture, a set of experiments was designed which made use of high quality, physically coherent, 1-year datasets from four reference sites of the Coordinated Enhanced Observing Period (CEOP) initiative. As in previous studies, it was shown that the LSM itself is generally the most important factor governing output. Beyond that, evapotranspiration seems to be most sensitive to precipitation, land cover, and radiation (in that order); sensible heat flux is most sensitive to radiation, precipitation, and land cover; and soil moisture is most sensitive to precipitation, soil, and land cover. Various seasonal and model specific dependencies and other caveats are discussed. Output fields were also com-pared with observations in order to test whether the LSMs are capable of simulating an observed reality given a plausible set of inputs. In general, that potential was fair for evapotranspiration, good for sensible heat flux but problematic given its strong sensitivity to the inputs, and poor for soil moisture. The results emphasize that improving the LSMs themselves, and not just the inputs, will be essential if we hope to model land surface water and energy processes accurately.

• 社団法人日本気象学会の論文
• 2007-02-28

著者

• Kato Hiroko

  Hydrological Sciences Branch Code 614.3 Nasa Goddard Space Flight Center

• RODELL Matthew

  Hydrological Sciences Branch, Code 614.3, NASA Goddard Space Flight Center

• BEYRICH Frank

  Deutscher Wetterdienst (DWD), Meteorologisches Observatorium

• CLEUGH Helen

  CSIRO Marine and Atmospheric Research, GPO Box 1666, ACT Australia 2601

• GORSEL Eva

  CSIRO Marine and Atmospheric Research, GPO Box 1666, ACT Australia 2601

• LIU Huizhi

  Institute of Atmospheric Physics, Chinese Academy of Sciences Beijing 100029

• Gorsel Eva

  Csiro Marine And Atmospheric Research Gpo Box 1666 Act Australia 2601

• Rodell Matthew

  Hydrological Sciences Branch Code 614.3 Nasa Goddard Space Flight Center

• Beyrich Frank

  Deutscher Wetterdienst (dwd) Meteorologisches Observatorium

• Liu Huizhi

  Institute Of Atmospheric Physics Chinese Academy Of Sciences Beijing 100029

• Liu Huizhi

  Institute Of Atmospheric Physics Chinese Academy

• Cleugh Helen

  Csiro Marine And Atmospheric Research Gpo Box 1666 Act Australia 2601

関連論文

• Sensitivity of Land Surface Simulations to Model Physics, Land Characteristics, and Forcings, at Four CEOP Sites(Coordinated Enhanced Observing Period(CEOP))
• Profiles of strong wind in urban boundary layer

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