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Effect of mesoscale orography on tro...

Chambers, Christopher R. S.

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Effect of mesoscale orography on tropical cyclones near Hawai'i's Big Island and in the South China Sea.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effect of mesoscale orography on tropical cyclones near Hawai'i's Big Island and in the South China Sea./
Author:	Chambers, Christopher R. S.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2008,
Description:	165 p.
Notes:	Source: Dissertations Abstracts International, Volume: 70-12, Section: B.
Contained By:	Dissertations Abstracts International70-12B.
Subject:	Physical geography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3347633
ISBN:	9781109033090

Effect of mesoscale orography on tropical cyclones near Hawai'i's Big Island and in the South China Sea.
Chambers, Christopher R. S.

Effect of mesoscale orography on tropical cyclones near Hawai'i's Big Island and in the South China Sea. - Ann Arbor : ProQuest Dissertations & Theses, 2008 - 165 p.

Source: Dissertations Abstracts International, Volume: 70-12, Section: B.

Thesis (Ph.D.)--University of Hawai'i at Manoa, 2008.

This item must not be sold to any third party vendors.

This dissertation presents the results of numerical modeling studies of two contrasting examples of tropical cyclones interacting with topography. The first example investigates the effect of the Big Island of Hawai'i on nearby tropical cyclones. The second example investigates the formation of near-equatorial Typhoon Vamei (2001) in the South China Sea. The Big Island simulations produce topographically forced phenomena that occur primarily because the island is strongly rooted in a flow splitting regime caused by its high and broad mountains, and by its shape. Blocking of lower-tropospheric flow leads to a slowing of movement when storms approach from the east. Southward track deviations occur if storms enter enhanced northeasterly flow south of the island. On close southeasterly approach axisymmetrization of core convection and winds occurs primarily because of blocking of the stronger easterly flow to the north of the storm. It is hypothesized that this led to the unexpected eye formation of Hurricane Flossie (2007) as it approached the Big Island. Storms that pass south of the island, deviate northward if they interact with the strong westerly steering anomaly associated with the island wake. The Hurricane Dot simulations suggest that this effect contributed to the deviation to the north that led to its eventual Kauai landfall. Stronger intensities can occur as a storm interacts with the island wake where there is a tendency for weakened vertical wind shear. Landfall produces large intensity decreases as the lower-level circulation is disrupted. Sharp northward track deviations can occur close to the island as the northerly flow west of the storm center is blocked by the island. In the simulation of Typhoon Vamei, strong northerly flow interacts with the regional landmasses to produce regional scale cyclonic flow near the equator. Mesoscale convective vortices develop along the southeastern flank of the northerly surge in a region of strong horizontal shear vorticity. These relatively small regions of high potential vorticity lead to rapid intensification as they merge together in the regional circulation. Since the Coriolis force was so small in this case the "equivalent f" comes from the topographically forced regional circulation.

ISBN: 9781109033090Subjects--Topical Terms:

516662
Physical geography.

Effect of mesoscale orography on tropical cyclones near Hawai'i's Big Island and in the South China Sea.
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520 $a This dissertation presents the results of numerical modeling studies of two contrasting examples of tropical cyclones interacting with topography. The first example investigates the effect of the Big Island of Hawai'i on nearby tropical cyclones. The second example investigates the formation of near-equatorial Typhoon Vamei (2001) in the South China Sea. The Big Island simulations produce topographically forced phenomena that occur primarily because the island is strongly rooted in a flow splitting regime caused by its high and broad mountains, and by its shape. Blocking of lower-tropospheric flow leads to a slowing of movement when storms approach from the east. Southward track deviations occur if storms enter enhanced northeasterly flow south of the island. On close southeasterly approach axisymmetrization of core convection and winds occurs primarily because of blocking of the stronger easterly flow to the north of the storm. It is hypothesized that this led to the unexpected eye formation of Hurricane Flossie (2007) as it approached the Big Island. Storms that pass south of the island, deviate northward if they interact with the strong westerly steering anomaly associated with the island wake. The Hurricane Dot simulations suggest that this effect contributed to the deviation to the north that led to its eventual Kauai landfall. Stronger intensities can occur as a storm interacts with the island wake where there is a tendency for weakened vertical wind shear. Landfall produces large intensity decreases as the lower-level circulation is disrupted. Sharp northward track deviations can occur close to the island as the northerly flow west of the storm center is blocked by the island. In the simulation of Typhoon Vamei, strong northerly flow interacts with the regional landmasses to produce regional scale cyclonic flow near the equator. Mesoscale convective vortices develop along the southeastern flank of the northerly surge in a region of strong horizontal shear vorticity. These relatively small regions of high potential vorticity lead to rapid intensification as they merge together in the regional circulation. Since the Coriolis force was so small in this case the "equivalent f" comes from the topographically forced regional circulation.
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