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Effect of wind variability on topographic waves: Lake Kinneret case
Year:
2007
Authors :
אסולין, שמואל
;
.
Volume :
112
Co-Authors:
Shilo, E., Department of Soil and Water Sciences, Hebrew University of Jerusalem, Rehovot 76100, Israel
Ashkenazy, Y., Department of Solar Energy and Environmental Physics, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Sede Boqer 84990, Israel
Rimmer, A., Yigal Alon Kinneret Limnological Laboratory, Oceanographic and Limnological Research, Migdal 14940, Israel
Assouline, S., Department of Environmental Physics and Irrigation, Institute of Soils Water and Environment Sciences, Volcani Center, Bet Dagan, Israel
Katsafados, P., Laboratory of Meteorology, Department of Applied Physics, National and Kapodistrian University of Athens, Athens GR-15784, Greece
Mahrer, Y., Department of Soil and Water Sciences, Hebrew University of Jerusalem, Rehovot 76100, Israel
Facilitators :
From page:
To page:
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Total pages:
1
)
Abstract:
We studied the winter wind driven circulation in Lake Kinneret (northern Israel) using state of the art atmospheric (Regional Atmosphere Modeling System (RAMS)) and oceanic (Regional Ocean Modeling System (ROMS)) general circulation models. During winter the lake is completely mixed and mainly forced by the passage of synoptic weather systems. The lake's dynamic response was identified using various wind regimes. The response of the lake to a uniform wind stress resulted in the formation of a double-gyre circulation pattern. After removal of the wind stress, the double-gyre pattern slowly rotated cyclonically (with a time period of several days) around the lake perimeter, consistent with the pattern of the lowest-mode basin-scale topographic (vorticity) wave. The use of RAMS-simulated wind fields resulted in a less symmetric structure of the double-gyre pattern due to the presence of a curl in the wind field. Using various wind regimes to force the lake indicated that the presence of a positive or negative curl in the wind field might result in a shift in the topographic wave frequency to a higher or lower value, respectively. This result may be easily applied to motions on the geophysical scale. The currents predicted by RAMS-ROMS agree well with measured data near the center of the lake. Forcing the model with a spatially uniform wind field constructed from a single station resulted in poor agreement with the observed currents, indicating the importance of the wid field spatial pattern. Copyright 2007 by the American Geophysical Union.
Note:
Related Files :
climate change
Flow patterns
gyre
Israel
Middle East
oceanic general circulation model
Vorticity
Water waves
wave modeling
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More details
DOI :
10.1029/2007JC004336
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20169
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:34
Scientific Publication
Effect of wind variability on topographic waves: Lake Kinneret case
112
Shilo, E., Department of Soil and Water Sciences, Hebrew University of Jerusalem, Rehovot 76100, Israel
Ashkenazy, Y., Department of Solar Energy and Environmental Physics, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Sede Boqer 84990, Israel
Rimmer, A., Yigal Alon Kinneret Limnological Laboratory, Oceanographic and Limnological Research, Migdal 14940, Israel
Assouline, S., Department of Environmental Physics and Irrigation, Institute of Soils Water and Environment Sciences, Volcani Center, Bet Dagan, Israel
Katsafados, P., Laboratory of Meteorology, Department of Applied Physics, National and Kapodistrian University of Athens, Athens GR-15784, Greece
Mahrer, Y., Department of Soil and Water Sciences, Hebrew University of Jerusalem, Rehovot 76100, Israel
Effect of wind variability on topographic waves: Lake Kinneret case
We studied the winter wind driven circulation in Lake Kinneret (northern Israel) using state of the art atmospheric (Regional Atmosphere Modeling System (RAMS)) and oceanic (Regional Ocean Modeling System (ROMS)) general circulation models. During winter the lake is completely mixed and mainly forced by the passage of synoptic weather systems. The lake's dynamic response was identified using various wind regimes. The response of the lake to a uniform wind stress resulted in the formation of a double-gyre circulation pattern. After removal of the wind stress, the double-gyre pattern slowly rotated cyclonically (with a time period of several days) around the lake perimeter, consistent with the pattern of the lowest-mode basin-scale topographic (vorticity) wave. The use of RAMS-simulated wind fields resulted in a less symmetric structure of the double-gyre pattern due to the presence of a curl in the wind field. Using various wind regimes to force the lake indicated that the presence of a positive or negative curl in the wind field might result in a shift in the topographic wave frequency to a higher or lower value, respectively. This result may be easily applied to motions on the geophysical scale. The currents predicted by RAMS-ROMS agree well with measured data near the center of the lake. Forcing the model with a spatially uniform wind field constructed from a single station resulted in poor agreement with the observed currents, indicating the importance of the wid field spatial pattern. Copyright 2007 by the American Geophysical Union.
Scientific Publication
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