摘要:本研究在WACCM+DART（Whole Atmosphere Community Climate Model，Data Assimilation Research Test-Bed）临近空间资料同化预报系统中加入SABER（Sounding of the Atmosphere using Broadband Emission Radiometry）和MLS（Microwave Limb Sounder）臭氧观测同化接口，并以2016年2月一次平流层爆发性增温（SSW）过程为模拟个例进行了SABER和MLS臭氧观测同化试验，得出以下结论：同化SABER和MLS臭氧体积浓度观测得出的WACCM+DART臭氧分析场能够较真实反映SSW期间北极上空平流层臭氧廓线随时间的演变特征，且与ERA5（Fifth Generation of ECMWF Reanalyses）再分析资料描述的臭氧变化特征具有很好的一致性；基于SABER和MLS臭氧观测的WACCM臭氧6 h预报检验表明同化臭氧观测对臭氧分析和预报误差的改善效果主要体现在南半球高纬平流层和北半球中高纬平流层中上层-中间层底部；基于ERA5再分析资料的WACCM+DART分析场检验表明同化SABER和MLS臭氧体积浓度资料可在提高北半球高纬地区上平流层-中间层底部臭氧场分析质量的同时减小该地区上平流层-中间层底部温度场和中间层底部纬向风场的分析误差；基于MLS臭氧资料的臭氧中期预报检验表明相对控制试验同化SABER和MLS臭氧体积浓度资料能更好改善0~5 d下平流层和中间层底部臭氧的预报效果。
关键词:WACCM(Whole Atmosphere Community Climate Model)/
DART(Data Assimilation Research Test-Bed)/
SABER(Sounding of the Atmosphere using Broadband Emission Radiometry)/
MLS(Microwave Limb Sounder)/
臭氧/
资料同化
Abstract:This research adds interface programs to the near space data assimilation and forecasting system[WACCM+DART (Whole Atmosphere Community Climate Model, Data Assimilation Research Test-Bed)] for assimilation of SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) and MLS (Microwave Limb Sounder) ozone data, and performs SABER and MLS ozone data assimilation experiments to simulate a SSW (stratosphere sudden warming) event during February 2016. The following main conclusions are reached. Firstly, the ozone analysis produced by SABER and MLS ozone volume concentrations data assimilation can well represent the sudden variation of stratospheric ozone profile above the north polar area during SSW, which shows good agreement with ERA5 (Fifth Generation of ECMWF Reanalyses) data in describing characteristics of ozone changes. The verification of 6-hour ozone forecast based on SABER and MLS observations shows that the improvement of 6-hour ozone forecast and analysis through assimilating SABER and MLS ozone volume concentrations data is obviously reflected in the stratosphere above the high latitudes in the Southern Hemisphere, the upper-middle stratosphere, and lower mesosphere above the middle and high latitudes in the Northern Hemisphere. The forecast verification based on ERA5 reanalysis suggests that the advantages of assimilation are more significant in high-latitude areas in the Northern Hemisphere, where the quality of ozone analysis in the middle and upper stratosphere and the lower mesosphere is improved and analysis errors of temperature in the upper stratosphere and the lower mesosphere and zonal winds in the lower mesosphere are reduced. The verification of 0-10-d ozone forecast based on MLS ozone observations shows that adding SABER and MLS ozone volume concentrations data assimilation to the WACCM+DART can better improve 0-5-d ozone forecasting results of the WACCM in the lower stratosphere and lower mesosphere compared to the control experiment.
Key words:WACCM (Whole Atmosphere Community Climate Model)/
DART (Data Assimilation Research Test-Bed)/
SABER (Sounding of the Atmosphere using Broadband Emission Radiometry)/
MLS (Microwave Limb Sounder)/
Ozone/
Data assimilation
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