Calculating Dropwindsonde Location and Time from TEMP-DROP Messages for Accurate Assimilation and Analysis

Aberson, Sim D.; Sellwood, Kathryn J.; Leighton, Paul A.

doi:10.1175/jtech-d-17-0023.1

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i

Calculating Dropwindsonde Location and Time from TEMP-DROP Messages for Accurate Assimilation and Analysis

2017
By Aberson, Sim D. ; Sellwood, Kathryn J. ; Leighton, Paul A.
Source: Journal of Atmospheric and Oceanic Technology, 34(8), 1673-1678.

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Journal Title:

Journal of Atmospheric and Oceanic Technology
Personal Author:

Aberson, Sim D. ; Sellwood, Kathryn J. ; Leighton, Paul A.

Aberson, Sim D. ; Sellwood, Kathryn J. ; Leighton, Paul A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

Current practice is to transmit dropwindsonde data from aircraft using the TEMP-DROP format, which provides only the release location and time with 0.1 degrees latitude x 0.1 degrees longitude (about 11 km) and 1-h resolutions, respectively. The current dropwindsonde has a fall speed of approximately 15 ms s(-1), so the instrument will be advected faster horizontally than it will descend if thewind speed exceeds this value. Where wind speeds are greatest, such as in tropical cyclones, this will introduce large errors in the location of the observations, especially near the surface. A technique to calculate the correct time and location of each observation in the TEMP-DROP message is introduced. The mean differences between the calculated and reported locations are about 0.5 km for distance and 15 s for time, or <1% of the error size for distance and <10% for time.
Source:

Journal of Atmospheric and Oceanic Technology, 34(8), 1673-1678.
DOI:

https://doi.org/10.1175/jtech-d-17-0023.1
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Journal Article
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urn:sha256:f084559a6c619794e98ca1bbbb0fdc24ceb778d03bd685a87589b918d6108527
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Calculating Dropwindsonde Location and Time from TEMP-DROP Messages for Accurate Assimilation and Analysis

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