Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event
AbsTRACT Previous observational studies have identified wind channelling over Frobisher Bay induced by pres-sure fields associated with cyclones as the main cause for the occurrence of strong and sustained surface winds at Iqaluit. The wind event of 7–8 November 2006, when a surface cyclone moved ov...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.454.6468 2023-05-15T16:18:30+02:00 Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event Daniel Deacu Ayrton Zadra John Hanesiak The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.6468 http://www.umanitoba.ca/ceos/STAR/6_PRES_PUBS/Pdfs/Deacu_Hanesiak_2010.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.6468 http://www.umanitoba.ca/ceos/STAR/6_PRES_PUBS/Pdfs/Deacu_Hanesiak_2010.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.umanitoba.ca/ceos/STAR/6_PRES_PUBS/Pdfs/Deacu_Hanesiak_2010.pdf text 2009 ftciteseerx 2016-01-08T06:06:37Z AbsTRACT Previous observational studies have identified wind channelling over Frobisher Bay induced by pres-sure fields associated with cyclones as the main cause for the occurrence of strong and sustained surface winds at Iqaluit. The wind event of 7–8 November 2006, when a surface cyclone moved over the Labrador Sea, is rep-resentative of many such occurrences. Our simulations of the event with the Global Environmental Multiscale – Limited Area Model (GEM-LAM 2.5 km) show an almost simultaneous development of wind channelling over Frobisher Bay and of downslope winds over the lee slopes of Hall Peninsula, as well as their interaction. The winds are caused by the passage of the same cyclone, but they advect different air masses. The channelled wind is initiated by a barrier jet generated as a result of the low-level blocking of northeasterly winds by steep orog-raphy near the head of the bay. Later, it intensifies, while being driven primarily by large-scale pressure gradi-ents. The cross-bay development of the channelled wind against the downslope wind over the lee slopes of Hall Peninsula explains the shift in surface wind direction and the high surface wind speeds recorded at Iqaluit. Some of the findings are also supported by data from radiosondes launched at Iqaluit. A short sensitivity study shows the beneficial effect of a distributed orographic drag parametrization on the near-surface winds. The impact of using a modified Lenderink-Holtslag mixing length and of increasing the vertical resolution near the surface are also addressed. Text Frobisher Bay Hall Peninsula Iqaluit Labrador Sea Unknown Frobisher Bay ENVELOPE(-66.581,-66.581,62.834,62.834) |
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ftciteseerx |
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English |
description |
AbsTRACT Previous observational studies have identified wind channelling over Frobisher Bay induced by pres-sure fields associated with cyclones as the main cause for the occurrence of strong and sustained surface winds at Iqaluit. The wind event of 7–8 November 2006, when a surface cyclone moved over the Labrador Sea, is rep-resentative of many such occurrences. Our simulations of the event with the Global Environmental Multiscale – Limited Area Model (GEM-LAM 2.5 km) show an almost simultaneous development of wind channelling over Frobisher Bay and of downslope winds over the lee slopes of Hall Peninsula, as well as their interaction. The winds are caused by the passage of the same cyclone, but they advect different air masses. The channelled wind is initiated by a barrier jet generated as a result of the low-level blocking of northeasterly winds by steep orog-raphy near the head of the bay. Later, it intensifies, while being driven primarily by large-scale pressure gradi-ents. The cross-bay development of the channelled wind against the downslope wind over the lee slopes of Hall Peninsula explains the shift in surface wind direction and the high surface wind speeds recorded at Iqaluit. Some of the findings are also supported by data from radiosondes launched at Iqaluit. A short sensitivity study shows the beneficial effect of a distributed orographic drag parametrization on the near-surface winds. The impact of using a modified Lenderink-Holtslag mixing length and of increasing the vertical resolution near the surface are also addressed. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Daniel Deacu Ayrton Zadra John Hanesiak |
spellingShingle |
Daniel Deacu Ayrton Zadra John Hanesiak Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event |
author_facet |
Daniel Deacu Ayrton Zadra John Hanesiak |
author_sort |
Daniel Deacu |
title |
Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event |
title_short |
Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event |
title_full |
Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event |
title_fullStr |
Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event |
title_full_unstemmed |
Canadian Meteorological and Oceanographic society Simulating Wind Channelling over Frobisher Bay and its Interaction with Downslope Winds during the 7–8 November 2006 Wind Event |
title_sort |
canadian meteorological and oceanographic society simulating wind channelling over frobisher bay and its interaction with downslope winds during the 7–8 november 2006 wind event |
publishDate |
2009 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.6468 http://www.umanitoba.ca/ceos/STAR/6_PRES_PUBS/Pdfs/Deacu_Hanesiak_2010.pdf |
long_lat |
ENVELOPE(-66.581,-66.581,62.834,62.834) |
geographic |
Frobisher Bay |
geographic_facet |
Frobisher Bay |
genre |
Frobisher Bay Hall Peninsula Iqaluit Labrador Sea |
genre_facet |
Frobisher Bay Hall Peninsula Iqaluit Labrador Sea |
op_source |
http://www.umanitoba.ca/ceos/STAR/6_PRES_PUBS/Pdfs/Deacu_Hanesiak_2010.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.454.6468 http://www.umanitoba.ca/ceos/STAR/6_PRES_PUBS/Pdfs/Deacu_Hanesiak_2010.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766004682974560256 |