Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate
Dissertation (Ph.D.) University of Alaska Fairbanks, 2014 Extratropical cyclones are fundamental elements for shaping weather patterns, causing fluctuations of temperatures, bringing rain or snow, and carrying winds to impact daily life. The intensity and number of North Hemisphere extratropical cyc...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/4577 2023-05-15T14:35:36+02:00 Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate Basu, Soumik Zhang, Xiangdong Bhatt, Uma Mölders, Nicole Polyakov, Igor 2014-05 http://hdl.handle.net/11122/4577 unknown http://hdl.handle.net/11122/4577 Department of Atmospheric Sciences Dissertation phd 2014 ftunivalaska 2023-02-23T21:36:15Z Dissertation (Ph.D.) University of Alaska Fairbanks, 2014 Extratropical cyclones are fundamental elements for shaping weather patterns, causing fluctuations of temperatures, bringing rain or snow, and carrying winds to impact daily life. The intensity and number of North Hemisphere extratropical cyclones have demonstrated large interannual variability and long-term changes. To understand the variability and changes, we conducted a modeling investigation using the National Center for Atmospheric Research (NCAR)'s Community Atmosphere Model. Specifically, we examined the effects of two surface forcing factors, including sea surface temperature (SST) associated with El Niño and Arctic sea-ice cover, which represent a major source of natural variability and climate changes. Our modeling investigation indicates that the tropical Pacific SST and Arctic sea ice have significant impacts on Northern Hemisphere mid-latitude and Arctic cyclone activities. The elevated tropical Pacific SST leads to more numerous intense storms over southwestern, southeastern, and northwestern North America, but fewer weaker storms over the northeast. The underlying physical mechanism is enhanced lower tropospheric baroclinicity, which is attributable to a southward shift and an intensification of the subtropical jet. The decreased Arctic sea-ice cover leads to an increased storm activity over the Arctic but a decrease in the mid-latitudes. A corresponding examination of surface climate shows anomalously higher surface air temperature and precipitation when low Arctic sea-ice cover occurs, due to an integrative contribution from an increase in surface sensible and latent heat fluxes and horizontal heat advection. In contrast, reduced Arctic sea ice weakens storm activity and intensifies anticyclones over Eurasia, giving rise to decreased surface air temperature and precipitation. Unlike many other parameters, the Arctic sea ice has shown a dramatic decline in addition to interannual fluctuations. We therefore conducted further modeling ... Doctoral or Postdoctoral Thesis Arctic Sea ice Alaska University of Alaska: ScholarWorks@UA Arctic Fairbanks Pacific |
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University of Alaska: ScholarWorks@UA |
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Dissertation (Ph.D.) University of Alaska Fairbanks, 2014 Extratropical cyclones are fundamental elements for shaping weather patterns, causing fluctuations of temperatures, bringing rain or snow, and carrying winds to impact daily life. The intensity and number of North Hemisphere extratropical cyclones have demonstrated large interannual variability and long-term changes. To understand the variability and changes, we conducted a modeling investigation using the National Center for Atmospheric Research (NCAR)'s Community Atmosphere Model. Specifically, we examined the effects of two surface forcing factors, including sea surface temperature (SST) associated with El Niño and Arctic sea-ice cover, which represent a major source of natural variability and climate changes. Our modeling investigation indicates that the tropical Pacific SST and Arctic sea ice have significant impacts on Northern Hemisphere mid-latitude and Arctic cyclone activities. The elevated tropical Pacific SST leads to more numerous intense storms over southwestern, southeastern, and northwestern North America, but fewer weaker storms over the northeast. The underlying physical mechanism is enhanced lower tropospheric baroclinicity, which is attributable to a southward shift and an intensification of the subtropical jet. The decreased Arctic sea-ice cover leads to an increased storm activity over the Arctic but a decrease in the mid-latitudes. A corresponding examination of surface climate shows anomalously higher surface air temperature and precipitation when low Arctic sea-ice cover occurs, due to an integrative contribution from an increase in surface sensible and latent heat fluxes and horizontal heat advection. In contrast, reduced Arctic sea ice weakens storm activity and intensifies anticyclones over Eurasia, giving rise to decreased surface air temperature and precipitation. Unlike many other parameters, the Arctic sea ice has shown a dramatic decline in addition to interannual fluctuations. We therefore conducted further modeling ... |
author2 |
Zhang, Xiangdong Bhatt, Uma Mölders, Nicole Polyakov, Igor |
format |
Doctoral or Postdoctoral Thesis |
author |
Basu, Soumik |
spellingShingle |
Basu, Soumik Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate |
author_facet |
Basu, Soumik |
author_sort |
Basu, Soumik |
title |
Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate |
title_short |
Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate |
title_full |
Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate |
title_fullStr |
Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate |
title_full_unstemmed |
Modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate |
title_sort |
modeling investigation of northern hemisphere extratropical storm variability and changes in a warming climate |
publishDate |
2014 |
url |
http://hdl.handle.net/11122/4577 |
geographic |
Arctic Fairbanks Pacific |
geographic_facet |
Arctic Fairbanks Pacific |
genre |
Arctic Sea ice Alaska |
genre_facet |
Arctic Sea ice Alaska |
op_relation |
http://hdl.handle.net/11122/4577 Department of Atmospheric Sciences |
_version_ |
1766308390384959488 |