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TAMDAR Discussion Board
TAMDAR aircraft obs in dev2 RUC
Posted By: Stan Benjamin
Date: 21-December-04 0404Z
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[a modified version of this just posted in the RUC forum under http://ruc.fsl.noaa.gov] The experimental TAMDAR aircraft observations for the upcoming Great Lakes Fleet Experiment, are now being assimilated hourly into the experimental development-2 version of the RUC. We are frequently seeing some variations in lower tropospheric temps and RH between the dev-2 RUC and the similarly configured dev RUC (the latter does not have TAMDAR data). From several inspections in the last week, we have seen very reasonable behavior and no problems in those few cases. An example is shown at http://ruc.fsl.noaa.gov/gif/tamdar/TAMDAR.tiff from a case at 22z 17 Dec 04 from Devils Lake, ND. The green sounding is from a descent into DVL from a Mesaba-equipped Mesaba Air aircraft, compared to the red sounding - operational RUC without TAMDAR, and the lavender sounding - dev-2 RUC with TAMDAR assimilation. The main difference from the TAMDAR in this case is from the temperature sounding. Note that the oper-RUC and dev-2-RUC analyses both fit the surface temperature very well, but with a very significant correction to the temperature profile in the lower 200 mb with inclusion of the TAMDAR sounding. A second example is also available at http://ruc.fsl.noaa.gov/gif/tamdar, both of 850mb RH/temp over the Great Lakes area at 02z 21 Dec 04 (this evening). Drier air is evident in the dev-2 run (w/ TAMDAR) to the west over the eastern Dakotas but also more moist along the 850mb wind shift from central Iowa up to the western UP of Michigan. Special credit at FSL to Bill Moninger and Tracy Lorraine Smith for work on this project. Thanks to all of the folks associated with the TAMDAR/GLFE project. Stan Benjamin
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