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Air-sea interaction during an extreme cold air outbreak from the eastern coast of the United StatesAn aircraft investigation of boundary layer mean and turbulent structure is reported, and the Lagrangian budgets of temperature and moisture in the subcloud layer following a streamline during an extreme cold air outbreak are evaluated. The maximum sea-air temperature difference was 23 K. Two aircraft were used: the NCAR Electra, which measured turbulent fluxes and investigated subcloud layer conditions, and the NASA Electra, which measured the height of cloud tops using lidar. A stratocumulus overcast was found from about 60 km offshore to the Gulf Stream core with cloud top rising downstream. East of the Gulf Stream cumulus congestus and snow showers were observed. Cloud base decreased downstream and numerous steam plumes filled the subcloud layer. Temperature cross sections show most warming, and moistening of the subcloud layer occurred before the Gulf Stream core. Windspeeds increased downstream and maxima were observed near cloud top (inversion) and in the subcloud layer. Lagrangian budgets showed most warming, and moistening of the layer between 70 m and about 100 m below mean cloud base was due to turbulent flux divergence.
Document ID
19900040087
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Grossman, Robert L.
(Cooperative Institute for Research in the Environmental Sciences Boulder, CO, United States)
Betts, Alan K.
(Colorado Univ. Boulder, CO, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1990
Publication Information
Publication: Monthly Weather Review
Volume: 118
ISSN: 0027-0644
Subject Category
Meteorology And Climatology
Accession Number
90A27142
Funding Number(s)
CONTRACT_GRANT: NAS5-29366
CONTRACT_GRANT: NAS5-30524
CONTRACT_GRANT: NSF ATM-87-05403
CONTRACT_GRANT: NSF ATM-85-18972
Distribution Limits
Public
Copyright
Other

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