Antarctic Cloud Macrophysical, Thermodynamic Phase, and Atmospheric Inversion Coupling Properties at McMurdo Station—Part II: Radiative Impact During Different Synoptic Regimes

Israel Silber, Johannes Verlinde, Maria Cadeddu, Connor J. Flynn, Andrew M. Vogelmann, Edwin W. Eloranta

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Different cloud types are generated over Antarctica as a result of various synoptic conditions. The cloud characteristics affect their impact on the surface energy budget. In this study, the dominating synoptic regimes over Antarctica (centered on the Ross Ice Shelf) are classified using self-organizing map analysis, applied over long-term ERA-Interim 700-hPa geopotential height data. The corresponding cloud properties over McMurdo Station (measured as part of the AWARE campaign) are described and discussed with respect to the synoptic settings and sea-ice extent conditions. Cloud radiative forcing calculations are performed as well, and a particular focus is given to the net longwave “radiatively cloudy/opaque” (RO) regime. These results are compared with measurements performed at the West Antarctic Ice Sheet (WAIS) Divide to examine their variability and applicability to other Antarctic locations. It is found that the McMurdo cloud properties are strongly affected by the regional flow patterns and mesoscale cyclonic activity, which often moderates the larger-scale synoptic regime influence. In contrast, the WAIS clouds are more susceptible to the varying synoptic settings. It is suggested that the positive trend in the (frequent) cyclonic activity near the Antarctic coastal regions makes ice clouds an increasingly prominent contributor for the RO cases, especially during freezeup and maximum sea-ice conditions.

Original languageEnglish (US)
Pages (from-to)1697-1719
Number of pages23
JournalJournal of Geophysical Research: Atmospheres
Volume124
Issue number3
DOIs
StatePublished - Feb 16 2019

Fingerprint

Ice
thermodynamics
ice
Thermodynamics
inversions
Sea ice
sea ice
Antarctic regions
Antarctica
ice sheet
Ross ice shelf
Self organizing maps
Interfacial energy
geopotential height
Flow patterns
cloud radiative forcing
ice clouds
radiative forcing
energy budgets
organizing

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

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abstract = "Different cloud types are generated over Antarctica as a result of various synoptic conditions. The cloud characteristics affect their impact on the surface energy budget. In this study, the dominating synoptic regimes over Antarctica (centered on the Ross Ice Shelf) are classified using self-organizing map analysis, applied over long-term ERA-Interim 700-hPa geopotential height data. The corresponding cloud properties over McMurdo Station (measured as part of the AWARE campaign) are described and discussed with respect to the synoptic settings and sea-ice extent conditions. Cloud radiative forcing calculations are performed as well, and a particular focus is given to the net longwave “radiatively cloudy/opaque” (RO) regime. These results are compared with measurements performed at the West Antarctic Ice Sheet (WAIS) Divide to examine their variability and applicability to other Antarctic locations. It is found that the McMurdo cloud properties are strongly affected by the regional flow patterns and mesoscale cyclonic activity, which often moderates the larger-scale synoptic regime influence. In contrast, the WAIS clouds are more susceptible to the varying synoptic settings. It is suggested that the positive trend in the (frequent) cyclonic activity near the Antarctic coastal regions makes ice clouds an increasingly prominent contributor for the RO cases, especially during freezeup and maximum sea-ice conditions.",
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Antarctic Cloud Macrophysical, Thermodynamic Phase, and Atmospheric Inversion Coupling Properties at McMurdo Station—Part II : Radiative Impact During Different Synoptic Regimes. / Silber, Israel; Verlinde, Johannes; Cadeddu, Maria; Flynn, Connor J.; Vogelmann, Andrew M.; Eloranta, Edwin W.

In: Journal of Geophysical Research: Atmospheres, Vol. 124, No. 3, 16.02.2019, p. 1697-1719.

Research output: Contribution to journalArticle

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