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| RAMMB CIRA 1st Quarter Report FY2008 |
October November December |
The heavy snow event of 20-21 December 2006 along the Colorado Front Range has been chosen as the case with which to begin the combined COSMIC/GOES-ozone upper tropospheric analysis product. The storm had a deep upper-level low (Fig. 1) which will provide a good example for looking at potential vorticity in the upper atmosphere. The COSMIC data from 20 December 2006 has been collected and the code to read and process the COSMIC data is in the initial stages. Initially the ozone data will come from an existing satellite, but the project is being performed in anticipation of the launch of GOES-R. (J. Dostalek)
Last quarter, we continued producing synthetic imagery of hotspots and began an investigation of how GOES-R ABI will sample the data. Several idealized fire “hotspots” were added into the 8 May 2003 severe weather case and delivered to Elaine Prins of CIMSS. A new request came from CIMSS to produce data for the Fire Radiative Power (FRP) for the 8 May 2003 case. FRP’s were calculated from model output and will serve as a truth dataset. This data was delivered to Jay Hoffman of CIMSS. In addition, the production of synthetic GOES-R ABI imagery over the Yucatan Peninsula is complete. (L. Grasso, M. Sengupta, and D. Hillger)
A meeting took place to discuss a new case over northern Europe. We decided on the so called “Kyrill” storm that produced widespread wind damage over Germany and surrounding location. This storm occurred in mid January 2007. (L. Grasso, D. Zupanski, M. Zupanski, I. Jankov, M. Sengputa, and R. Brummer)
As part of our collaboration, efforts have begun to produce synthetic GOES-R ABI imagery from the WRF model. (L. Grasso, I. Jankov)
The simulation of hurricane Wilma is complete. Production of synthetic GOES-R ABI imagery will begin. (L. Grasso)
Two versions of simulated full-disk GOES-R ABI band-9 WV (6.95 μm) images were created from Meteosat Second Generation (MGS) images. Using coefficients supplied by Min-Jeong Kim, this can be done by either of two methods. The first method uses the satellite zenith angle for each pixel and the two MSG WV bands (5 and 6). The second method uses regression on two MSG WV (5 and 6) and two MSG IR bands (7 and 8). There are two reasons for generating this particular product: 1) to demonstrate the ability to generate simulated ABI data for GOES-R Risk Reduction activities and related ABI product development, and 2) to provide a WV band in the 6.5 μm to 7.0 μm range, similar to the WV bands on other current geostationary satellites (GOES, Meteosat-7, and MTSAT). The WV imagery from all the geostationary satellites will eventually be composited into a single WV image covering most of the world, which would not be possible using MSG imagery directly, since the two MSG WV bands are on the edges of the desired spectral range and would not allow a good composite image to be created. (D. Hillger)
Figure: Two versions of simulated full-disk ABI WV band 9 created by spectral transformation of MSG full-disk imagery. In the top row are MSG WV bands 5 and 6. In the bottom row the ABI “9a” image was created by incorporating the zenith angle of each pixel and the two MSG bands shown, whereas the ABI “9b” image was created using regression on MSG IR bands 7 and 8 (not shown) in addition to bands 5 and 6. There are slight differences between the two ABI band-9 products, which are hard to see at full-disk resolution. That difference, with a standard deviation of about 1 K and a maximum difference of about 5 K, is a measure of the limit of the ability to simulate this ABI band.
Using coefficients supplied by Min-Jeong Kim, simulated GOES-R ABI infrared images (for bands 7 through 16) were created from Meteosat Second Generation (MGS) infrared images (from bands 4 through 11). This can be done by either of two methods. The first method involves the satellite zenith angle for each pixel and the one or two spectrally-close MSG bands. The second method involves regression on up to four MSG bands for each ABI band. At this point, only the spectral transformation is being considered, not the increase in spatial resolution (from 3 km to 2 km) that will be available with ABI. (D. Hillger)
Figure: Simulated ABI infrared bands 7 through 16 created by spectral transformation of MSG infrared bands 4 through 11. (Note that at this point the images have navigation identical to MSG, without the increase in spatial resolution expected with ABI.)
There is a planned change in the GOES Variable (GVAR) broadcast format that will take place with GOES-O to be launched in 2008. Software at CSU’s Ground Station has been upgraded to accommodate the new GVAR block necessitated by the increased resolution of Band-6 at 13.3 μm. The next step will be to test the new ground station software. Towards that end, test data have been requested from Satellite Operations. The first part of that test was the receipt of a CD with GOES-12 GVAR data to see if the data can be used to test our software, so that simulated GOES-O data in the new GVAR format can be sent next. (D. Hillger, D.G. Reinke)