University of Wisconsin-Madison MODIS/AIRS Collocation, AIRS Cloud Mask and AIRS All Sky Single FOV Retrieval Package Version 1.1 16 December 2009
This package contains updates and improvements to the original UW AIRS Utility Package released in March 2009.
It contains software that will allow a user to create an output file containing MODIS/AIRS collocations,
an AIRS cloud mask based upon the collocated MODIS cloud mask pixels and then
execute an AIRS retrieval algorithm at single field-of-view in all sky
conditions using the AIRS cloud mask as input. The statistical retrieval algorithm creates an output binary and/or HDF file containing:
- surface skin temperature [K]
- atmospheric temperature [K] at 101 pressure levels
- total precipitable water (vertically integrated) [cm]
- atmospheric moisture [g/kg] at 101 pressure levels
- total ozone amount (vertically integrated) [Dobson units]
- atmospheric ozone [ppmv] at 101 pressure levels
- surface emissivity at 2378 (AIRS) wavenumbers
- cloud top pressure [mbar]
This version allows the use
of either direct broadcast passes of arbitrary size or standard
MODIS 5 minute granules acquired from the NASA archive. The software allows each step to be run independently
or in sequence.
Changes to the package include:
- The collocation software has been rewritten in C++ by Greg Quinn. The
collocation algorithm has not changed. Please see:
-
Nagle, Frederick W. and Robert E. Holz, 2009: Computationally
Efficient Methods of Collocating Satellite, Aircraft, and Ground
Observations. J. of Atmos. and Ocean Tech., Volume 26, Issue 8,
pp. 1585-1595.
The collocation airsmodhdf.exe executable has been replaced by
the airsmod_static executable, and the arguments to it are:
-
airsmod_static airsfile modis_geo_file output_file
You can now use either direct broadcast MODIS geolocation and
cloud mask files (files that cover the same usable data orbit as
AIRS) using the IMAPP naming conventions a1.yyddd.hhmm.geo.hdf and
a1.yyddd.hhmm.mod35.hdf or the 2 to 3 DAAC/MODAPS 5 minute granule
segments that coincide with the AIRS data with naming
conventions MYD03.AYYYYDDD.HHMM.005.yyyydddhhmmss.hdf and
MYD35_L2.AYYYYDDD.HHMM.005.yyyydddhhmmss.hdf.
There is a new argument to the main run script "MODE" that
lets the program know whether you are processing Direct Broadcast MODIS
data segments (passes of arbitrary size using the IMAPP naming conventions) or
NASA archive 5 minute segments.
RUN_AIRS_UTILS_RTV.scr MODE AIRSL1BFILENAME OUTDIR
MODE is either 1 or 2
1 = Direct Broadcast MODIS files (naming convention a1...)
2 = MODAPS Archive 5 minute files (naming convention MYD..)
Two new scripts have been written to run the
collocation and cloud mask on the 5 minute MODIS granules
(there will be either 2 or 3 files per 6 minute AIRS L1B file)
run_5min_collocation_and_cfrac.scr
get_5Min_myd03.scr
More information is provided in the release README file that is included
with the package. To download the software, please select the DOWNLOAD NOW
link below.
PLEASE NOTE: There is new version of the AIRS single field-of-view software
that no longer requires the MODIS cloud mask as input, and therefore does not require
the MODIS/AIRS collocation software or the AIRS cloud mask software. To use
that software package, please see the UWAIRS dual regression retrieval software page.
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