Details
Original language | English |
---|---|
Article number | L23804 |
Journal | Geophysical research letters |
Volume | 35 |
Issue number | 23 |
Early online date | 3 Dec 2008 |
Publication status | Published - 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.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- General Earth and Planetary Sciences
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In: Geophysical research letters, Vol. 35, No. 23, L23804, 16.12.2008.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - On the influence of sea-ice inhomogeneities onto roll convection in cold-air outbreaks
AU - Gryschka, M.
AU - Drüe, C.
AU - Etling, D.
AU - Raasch, S.
N1 - We would like to thank J. Hartmann forproviding data from the ARTIST experiment. All runs were performed onan IBM pSeries 690 supercomputer of the Norddeutscher Verbund fu ̈rHoch- und Ho ̈chstleistungsrechnen (HLRN). MODIS data were madeavailable by the NASA Goddard Space Flight Center (GSFC). This workwas supported by the Deutsche Forschungsgemeinschaft. The helpfulcomments of two reviewers are very much appreciated.
PY - 2008/12/16
Y1 - 2008/12/16
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=60149095881&partnerID=8YFLogxK
U2 - 10.1029/2008GL035845
DO - 10.1029/2008GL035845
M3 - Article
AN - SCOPUS:60149095881
VL - 35
JO - Geophysical research letters
JF - Geophysical research letters
SN - 0094-8276
IS - 23
M1 - L23804
ER -