On the Usage of Recalibrated Radiance in Reanalysis Experiments

Chattopadhyay, Mohar ; McCarty, Will ; Moradi, Isaac

关键词: ASSIMILATION;    ATMOSPHERIC TEMPERATURE;    CALIBRATING;    DATA FLOW ANALYSIS;    INTERCALIBRATION;    RADIANCE;    STRATOSPHERE;    THERMAL STABILITY;    BRIGHTNESS TEMPERATURE;    CLIMATOLOGY;    MICROWAVE LANDING SYSTEMS;    NOAA 7 SATELLITE;    OCEANS;    TEMPERATURE PROFILES;    VARIABILITY;    WIND (METEOROLOGY);   

RP-ID  :  GSFC-E-DAA-TN63935

学科分类：地球科学(综合)

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来源: NASA Technical Reports Server

【 摘 要 】

Usage of re-calibrated data in reanalysis systems are quite common due to their uniform and continuous data distribution. Recalibrated radiosonde temperature and SSU radiances have already shown positive impact in MERRA and MERRA2 reanalyses. In this study recalibrated AMSU-A radiances are used to study sudden degradation of observation statistics which are noticed with the introduction of new AMSU-A radiances in MERRA2. In particular, the analysis temperature in the upper stratosphere showed large variability due to lack of viable observation at that height in the atmosphere. Our results show that the re-calibrated AMSU-A radiance in a system similar to MERRA2 is capable of mitigating the problem.