Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406803a&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 6, CiteID L06803
Physics
4
Atmospheric Processes: Remote Sensing, Atmospheric Processes: Stratosphere/Troposphere Interactions, Atmospheric Processes: Turbulence (4490)
Scientific paper
A four day high temporal resolution MU radar RASS data set was obtained under light wind conditions in August 1995, enabling retrieval of virtual temperatures up to 20 km. This provided a unique opportunity to study the vertical eddy diffusivity K across the tropopause using RASS Brunt-Väisälä frequency N and radar spectral width. Co-located six hourly radiosondes enabled calculation of K using radiosonde N and radar spectral width. RASS K decreased across the WMO tropopause, from (0.39 +/- 0.05) m2s-1 in the uppermost kilometre of the troposphere to (0.27 +/- 0.03) m2s-1 in the lowermost kilometre of the stratosphere. The equivalent radiosonde K were (0.43 +/- 0.06) m2s-1 and (0.31 +/- 0.07) m2s-1 respectively. The WMO tropopause seems to provide a better definition than the cold-point tropopause in separating the stratosphere from the troposphere when considering the mixing of minor constituents.
Alexander S. P.
Tsuda Teruhisa
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