Skin Temperature Analysis and Bias Correction in a Coupled Land-Atmosphere Data Assimilation System(<Special Issue>Coordinated Enhanced Observing Period(CEOP))

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概要

• 論文の詳細を見る

• In an initial investigation, remotely sensed surface temperature is assimilated into a coupled atmosphere/land global data assimilation system, with explicit accounting for biases in the model state. In this scheme, a incremental bias correction term is introduced in the model's surface energy budget. In its simplest form, the algorithm estimates and corrects a constant time mean bias for each gridpoint; additional benefits are attained with a refined version of the algorithm which allows for a correction of the mean diurnal cycle. The method is validated against the assimilated observations, as well as independent near-surface air temperature observations. In many regions, not accounting for the diurnal cycle of bias caused degradation of the diurnal amplitude of background model air temperature. Energy fluxes collected through the Coordinated Enhanced Observing Period (CEOP) are used to more closely inspect the surface energy budget. In general, sensible heat flux is improved with the surface temperature assimilation, and two stations show a reduction of bias by as much as 30 W m^<-2> At the Rondonia station in Amazonia, the Bowen ratio changes direction in an improvement related to the temperature assimilation. However, at many stations the monthly latent heat flux bias is slightly increased. These results show the impact of univariate assimilation of surface temperature observations on the surface energy budget, and suggest the need for multivariate land data assimilation. The results also show the need for independent validation data, especially flux stations in varied climate regimes.

• 社団法人日本気象学会の論文
• 2007-02-28

著者

• BOSILOVICH Michael

  NASA Data Assimilation Office

• Bosilovich Michael

  Nasa I Global Modeling And Assimilation Office Goddard Space Flight Center

• RADAKOVICH Jon

  NASA I Global Modeling and Assimilation Office, Goddard Space Flight Center

• SILVA Arlindo

  NASA I Global Modeling and Assimilation Office, Goddard Space Flight Center

• TOOLING Ricardo

  NASA I Global Modeling and Assimilation Office, Goddard Space Flight Center

• VERTER Frances

  NASA I Global Modeling and Assimilation Office, Goddard Space Flight Center

• Silva Arlindo

  Nasa I Global Modeling And Assimilation Office Goddard Space Flight Center

• Radakovich Jon

  Nasa I Global Modeling And Assimilation Office Goddard Space Flight Center

• Verter Frances

  Nasa I Global Modeling And Assimilation Office Goddard Space Flight Center

• Tooling Ricardo

  Nasa I Global Modeling And Assimilation Office Goddard Space Flight Center

関連論文

• Initial CEOP-based Review of the Prediction Skill of Operational General Circulation Models and Land Surface Models(Coordinated Enhanced Observing Period(CEOP))
• Skin Temperature Analysis and Bias Correction in a Coupled Land-Atmosphere Data Assimilation System(Coordinated Enhanced Observing Period(CEOP))

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