Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 1 MTG-IRS OSSE on regional scales Xiang-Yu Huang, Hongli Wang, Yongsheng Chen and Xin Zhang National Center for Atmospheric Research, Boulder, Colorado, U.S.A. Stephen A. Tjemkes, Rolf Stuhlmann EUMETSAT, Darmstadt, Germany
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Huang et al: MTG-IRS OSSEMMT, 17-18 June 2008. 1 MTG-IRS OSSE on regional scales Xiang-Yu Huang, Hongli Wang, Yongsheng Chen and Xin Zhang National Center.
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Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 1
MTG-IRS OSSE on regional scales
Xiang-Yu Huang, Hongli Wang, Yongsheng Chen and Xin Zhang
National Center for Atmospheric Research, Boulder, Colorado, U.S.A.
Stephen A. Tjemkes, Rolf Stuhlmann
EUMETSAT, Darmstadt, Germany
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 2
Contents
• The OSSE configuration
• The nature run
• Simulated (conventional and MTG) observations
• Calibration experiments
• Data assimilation and forecast results
• 4D-Var results
• Summary
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 3
The OSSE Configuration
• Nature run model: MM5
• Assimilation model: WRF
• Data assimilation scheme: WRF 3D-Var (4D-Var)
• Selected cases:
– International H2O Project (IHOP, 13 May - 25 June 2002)
The observation is on The observation is on Polar Stereographic Projection Grid. Grid.The simulated rainfall is on The simulated rainfall is on Lambert Projection Grid. Grid.The color scales are different.The color scales are different.
0600 UTC 12 Jun0600 UTC 12 Jun 0600 UTC 12 Jun0600 UTC 12 Jun
– WSM6 microphysics– New Grell cumulus paramerization– MRF boundary layer
• Case A: 2002-06-11 18Z to 2002-06-12 12Z• Case B: 2002-06-12 18Z to 2002-06-13 12Z• Background: GFS analysis and forecasts• Data: Retrieved profiles + SOP or “Truth”• Verification against truth
Experiments design (4D-Var)
D1
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 25
RMS error of Case A12 h FCST
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 26
Case A at 18H FCST
ETS
BIAS
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 27
RMS error of Case B12 h FCST
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 28
Case B at 18H FCST
ETS
BIAS
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 29
Summary
• Three storms are well reproduced in the 5 day nature run.
• The calibration experiment shows that the real and simulated
observations have the similar impacts on the analyses increments
and forecasts differences.
• The quality of the retrievals has been improved significantly.
• The forecast skill of wind, temperature and moisture forecasts is
improved when MTG-IRS T and/or q profiles are assimilated.
Rainfall forecast skill is improved also.
• In two short periods of experiments, assimilating MTG-IRS data
using 4D-Var gives slightly better forecast skills over 3D-Var.
Huang et al: MTG-IRS OSSE MMT, 17-18 June 2008. 30
Current and planned work• Continue the 4D-Var experiments
• Other nature runs
• Try other cases – Europe– Tropics– Over oceans– …