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Greenland's influence on cyclone act...

Li, Lin.

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Greenland's influence on cyclone activity.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Greenland's influence on cyclone activity./
作者:	Li, Lin.
面頁冊數:	147 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1770.
Contained By:	Dissertation Abstracts International64-04B.
標題:	Physics, Atmospheric Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3088870

Greenland's influence on cyclone activity.
Li, Lin.

Greenland's influence on cyclone activity. - 147 p.

Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1770.

Thesis (Ph.D.)--The Ohio State University, 2003.

The climatic significance of Greenland is determined by two main facts: the thermal forcing of its ice sheet and its topographic forcing near the middle of the North Atlantic storm track. The Greenland Ice Sheet boasts about 10 percent of the world's freshwater and its melting contributes about 7 percent of the annual rise in global sea level. This study explores the connection between cyclone activity around Greenland and Rogers' (1984) NAO monthly and seasonal indices. Serreze's (1995) storm tracking algorithm is optimized to track cyclones over Denmark Strait and along the west coast of Greenland using both the ECIVIWF Reanalysis mean sea level pressure field from 1979 to 1993 (ERA-15) and the ECMWF TOGA high resolution mean sea level pressure field from 1985 to 2000. It is found that cyclone activity along Denmark Strait is highly correlated with NAO indices, especially in winter. There are more cyclones passing Denmark Strait and more cyclogenesis in positive NAO months or seasons. These cyclones are more intense and their deepening rates are larger in comparison to those in negative NAO months or seasons. Along the west coast of Greenland, due to the different sources of cyclones from those passing Denmark Strait, cyclone activity does not show a high correlation with NAO indices. Cyclone activity is frequent along the southeast and west coasts and over northern Greenland. Cyclone activity along the southeast and west coasts of Greenland is associated with high precipitation, while over northern Greenland, cyclonic activity related precipitation is fairly small.Subjects--Topical Terms:

1019431
Physics, Atmospheric Science.

Greenland's influence on cyclone activity.
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245 1 0 $a Greenland's influence on cyclone activity.
300 $a 147 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-04, Section: B, page: 1770.
500 $a Adviser: David H. Bromwich.
502 $a Thesis (Ph.D.)--The Ohio State University, 2003.
520 $a The climatic significance of Greenland is determined by two main facts: the thermal forcing of its ice sheet and its topographic forcing near the middle of the North Atlantic storm track. The Greenland Ice Sheet boasts about 10 percent of the world's freshwater and its melting contributes about 7 percent of the annual rise in global sea level. This study explores the connection between cyclone activity around Greenland and Rogers' (1984) NAO monthly and seasonal indices. Serreze's (1995) storm tracking algorithm is optimized to track cyclones over Denmark Strait and along the west coast of Greenland using both the ECIVIWF Reanalysis mean sea level pressure field from 1979 to 1993 (ERA-15) and the ECMWF TOGA high resolution mean sea level pressure field from 1985 to 2000. It is found that cyclone activity along Denmark Strait is highly correlated with NAO indices, especially in winter. There are more cyclones passing Denmark Strait and more cyclogenesis in positive NAO months or seasons. These cyclones are more intense and their deepening rates are larger in comparison to those in negative NAO months or seasons. Along the west coast of Greenland, due to the different sources of cyclones from those passing Denmark Strait, cyclone activity does not show a high correlation with NAO indices. Cyclone activity is frequent along the southeast and west coasts and over northern Greenland. Cyclone activity along the southeast and west coasts of Greenland is associated with high precipitation, while over northern Greenland, cyclonic activity related precipitation is fairly small.
520 $a Cases of cyclones crossing the Greenland Ice Sheet are examined with numerical simulations to determine the impact of the ice sheet cyclone formation. A cyclone can transverse the entire ice sheet and redevelop on the east coast due to the different movement rates of waves on the thermal and geopotential height fields that are caused by the high elevation of the ice sheet. At low levels, a low-level jet (LLJ) brings warm moist air from the southwest, and downslope northerly winds bring cold dry air from the ice sheet, increasing the baroclinic instability. Accompanying the cyclone evolution, tropopause folding or undulation is found.
520 $a The impact of Greenland on the cyclonic activity is also investigated via a sensitivity study with Polar MM5 where the Greenland Ice Sheet is reduced to one tenth of its current elevation for a positive and negative NAO January. The monthly mean sea level pressure center with reduced Greenland both for positive and negative NAO months is located to the south of Iceland, whereas during the positive NAO month with current Greenland the center is located to the southeast of Greenland. This indicates that the chance of cyclogensis in the lee of southern reduced Greenland is greatly decreased. (Abstract shortened by UMI.)
590 $a School code: 0168.
650 4 $a Physics, Atmospheric Science. $3 1019431
650 4 $a Physical Oceanography. $3 1019163
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710 2 0 $a The Ohio State University. $3 718944
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790 1 0 $a Bromwich, David H., $e advisor
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791 $a Ph.D.
792 $a 2003
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