Status of MIRS Updates

Kevin Garrett and Sid-Ahmed BoukabaraMIRS Meeting

February 15, 2008

Status of MIRS Validation

Extension of MIRS validation with RAOB to website. Use ICDB dataset radiosonde records Generic collocation program to collocate n18/MetOp-A

FMSDRs with radiosonde (metadata) Generation of statistical plots for website display

Source-code package ready Need script functions to control inputs

Will be extended to other datasets/retrievals as they become available ECMWF, COSMIC SSMI/S

Science Improvements - CRTM Interface MIRS fwd.f90 to new CRTM

New subroutine in FwdOper module (intrFaceCRTM) Error in CRTM LEVEL indexing caused bias/stddev > 1.5-3 for

some channels compared to previous CRTM Correct indexing reduced bias/stddev to generally < 0.3

Interface MIRS 1dvar.f90 to new CRTM Modified subroutine in FwdOper module (FwdOper) Comparison of jacobians (new and old K) are consistent, but

show small differences Retrievals with new CRTM have difficulty reducing ChiSq < 1 Further investigation required

Science Improvements - CRTM Interface colocNWPwRad module

Still uses FastEM3 for emissivity over ocean Extended interface to call new FwdOper to return

transmissivity for emissivity calculation over land

Science Improvements - CRTM MIRS Repository Impact

Updated programs/modules 1dvar.f90, fwd.f90, colocNWPwRad.f90,FwdOper.f90 Src/CRTMp replaced New CRTM src code is downloaded and compiled once

Creates src/CRTM/include, src/CRTM/lib MIRS makefiles modified to link new CRTM library Need to retain FastEM3.f90 (not included in latest CRTM

package)

MicroRad 2008 Update

NOAA-08: An Optimal Atmospheric Dataset for Algorithm Training and Covariance Matrix Generation Contains highly QC’d profiles from IGRA, Dropsonde, COSMIC,

ECMWF, GDAS, MM5 Readers for IGRA, Dropsonde, GDAS, MM5 Need to finish preliminary data collection

Theoretical study of the impact of scanning geometry on microwave sounding of temperature and humidity Need to start simulations of NOAA-88 set over various surface

types Retrievals using AMSU/MHS, SSMI/S channels with instrument

configured as conical (fixed scan angle) and cross-track (variable scan angle)

Will extend simulations/retrievals to NOAA-08 dataset once established (time permitting)