On the influence of sea-ice inhomogeneities onto roll convection in cold-air outbreaks

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Authors

  • M. Gryschka
  • C. Drüe
  • D. Etling
  • S. Raasch

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  • Trier University
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Original languageEnglish
Article numberL23804
JournalGeophysical research letters
Volume35
Issue number23
Early online date3 Dec 2008
Publication statusPublished - 16 Dec 2008

Abstract

In this study we use large-eddy simulations (LES) to model roll convection within the convective atmospheric boundary-layer (CBL) during strong cold-air outbreaks (CAO). Previous LES were mostly unsuccessful in reproducing clear signals of roll convection, especially in case of strong surface heating and weak vertical wind shear in the CBL. In nature however, this phenomenon is very robust and roll convection can be observed as cloud streets in satellite pictures of almost any CAO. Previous LES studies assumed homogeneous sea-ice, unlike the current study, where under strong surface heating clear signals of rolls appear only when introducing sea-ice inhomogeneities in the marginal ice zone. For weaker surface heating, rolls also appear without sea-ice inhomogeneities. The results of this study suggest that in case of strong surface heating and weak vertical wind shear surface inhomogeneities increase the chance of roll formation.

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Cite this

On the influence of sea-ice inhomogeneities onto roll convection in cold-air outbreaks. / Gryschka, M.; Drüe, C.; Etling, D. et al.
In: Geophysical research letters, Vol. 35, No. 23, L23804, 16.12.2008.

Research output: Contribution to journalArticleResearchpeer review

Gryschka M, Drüe C, Etling D, Raasch S. On the influence of sea-ice inhomogeneities onto roll convection in cold-air outbreaks. Geophysical research letters. 2008 Dec 16;35(23):L23804. Epub 2008 Dec 3. doi: 10.1029/2008GL035845
Gryschka, M. ; Drüe, C. ; Etling, D. et al. / On the influence of sea-ice inhomogeneities onto roll convection in cold-air outbreaks. In: Geophysical research letters. 2008 ; Vol. 35, No. 23.
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abstract = "In this study we use large-eddy simulations (LES) to model roll convection within the convective atmospheric boundary-layer (CBL) during strong cold-air outbreaks (CAO). Previous LES were mostly unsuccessful in reproducing clear signals of roll convection, especially in case of strong surface heating and weak vertical wind shear in the CBL. In nature however, this phenomenon is very robust and roll convection can be observed as cloud streets in satellite pictures of almost any CAO. Previous LES studies assumed homogeneous sea-ice, unlike the current study, where under strong surface heating clear signals of rolls appear only when introducing sea-ice inhomogeneities in the marginal ice zone. For weaker surface heating, rolls also appear without sea-ice inhomogeneities. The results of this study suggest that in case of strong surface heating and weak vertical wind shear surface inhomogeneities increase the chance of roll formation.",
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