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Impacts of Assimilating MLS Temperature on the Upper Stratosphere in GEOS-5Standard configurations of the GEOS-5 data assimilation system use nadir infrared and microwave sounders that provide deep-layer constraints on the thermal structure in the stratosphere. In the upper stratosphere, this information is currently provided by the Advanced Microwave Sounding Units (AMSU-As) on NOAA s polar-orbiting satellites. The highest peaking AMSU-A channel (14) peaks near 2.5hPa. Evaluation of the upper stratosphere reveals substantial biases in the temperature, cased in part by biases in the underlying GCM, and difficulties in representing the stratopause structure under disturbed conditions. This work demonstrates, unsurprisingly, that the assimilation into GEOS-5 of temperature profiles derived from EOS-Aura MLS leads to a substantially better representation of the stratopause structure from a climatological perspective and for disturbed events. Future plans with GEOS-5 include a reanalysis that includes numerous "research" datasets alongside the operational NOAA datasets that were used in MERRA. As preparation for this reanalysis, the present study examines how assimilating the MLS observations impact the error statistics for the AMSU-A instruments. Discussion will address the issue of bias correction for the AMSU-A Channel 14 radiances, which is presently turned off in GEOS-5 because of the absence of accurate temperature observations that can anchor the GEOS-5 analyses. The issue of what can be done in periods when no limb-sounder data are available will also be addressed.
Document ID
20120014305
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Pawson, S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jin, S.
Coy, L. (Science Systems and Applications, Inc. Greenbelt, MD, United States)
Wargan, K. (Science Systems and Applications, Inc. Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
October 1, 2012
Subject Category
Meteorology And Climatology
Report/Patent Number
GSFC.ABS.7066.2012
Meeting Information
Meeting: Aura Science Team Meeting
Location: Pasadena, CA
Country: United States
Start Date: October 1, 2012
End Date: October 3, 2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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