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Acta Meteorologica Sinica

, Volume 25, Issue 5, pp 545–557 | Cite as

Influence of surface temperature and emissivity on AMSU-A assimilation over land

  • Wenying He (何文英)Email author
  • Zhiquan Liu (刘志权)
  • Hongbin Chen (陈洪滨)
Article

Abstract

AMSU-A (Advanced Microwave Sounding Unit-A) measurements for channels that are sensitive to the surface over land have not been widely assimilated into numerical weather prediction (NWP) models due to complicated land surface features. In this paper, the impact of AMSU-A assimilation over land in Southwest Asia is investigated with the Weather Research and Forecasting (WRF) model. Four radiance assimilation experiments with different land-surface schemes are designed, then compared and verified against radiosonde observations and global analyses. Besides the surface emissivity calculated from the emissivity model and surface temperature from the background field in current WRF variational data assimilation (WRF-VAR) system, the surface parameters from the operational Microwave Surface and Precipitation Products System (MSPPS) are introduced to understand the influence of surface parameters on AMSU-A assimilation over land.

The sensitivity of simulated brightness temperatures to different surface configurations shows that using MSPPS surface alternatives significantly improves the simulation with reduced root mean square error (RMSE) and allows more observations to be assimilated. Verifications of 24-h temperature forecasts from experiments against radiosonde observations and National Centers for Environmental Prediction (NCEP) global analyses show that the experiments using MSPPS surface alternatives generate positive impact on forecast temperatures at lower atmospheric layers, especially at 850 hPa. The spatial distribution of RMSE for forecast temperature validation indicates that the experiments using MSPPS surface temperature obviously improve forecast temperatures in the mountain areas. The preliminary study indicates that using proper surface temperature is important when assimilating lower sounding channels of AMSU-A over land.

Key words

AMSU-A surface temperature microwave surface emissivity radiance assimilation 

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Copyright information

© The Chinese Meteorological Society and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Wenying He (何文英)
    • 1
    Email author
  • Zhiquan Liu (刘志权)
    • 2
  • Hongbin Chen (陈洪滨)
    • 1
  1. 1.LAGEO, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.National Center for Atmospheric Research (NCAR) Earth System LaboratoryBoulderUSA

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