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Analysis of the upper ocean response...

University of South Carolina., Marine Science.

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Analysis of the upper ocean response to hurricanes in the Gulf of Mexico using satellite observations and model simulations.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Analysis of the upper ocean response to hurricanes in the Gulf of Mexico using satellite observations and model simulations./
作者:	Gierach, Michelle Marie.
面頁冊數:	133 p.
附註:	Adviser: Subrahmanyam Bulusu.
Contained By:	Dissertation Abstracts International70-02B.
標題:	Physical Oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3344923
ISBN:	9781109050042

Analysis of the upper ocean response to hurricanes in the Gulf of Mexico using satellite observations and model simulations.
Gierach, Michelle Marie.

Analysis of the upper ocean response to hurricanes in the Gulf of Mexico using satellite observations and model simulations. - 133 p.

Adviser: Subrahmanyam Bulusu.

Thesis (Ph.D.)--University of South Carolina, 2009.

Biophysical responses of the upper ocean to hurricanes in the Gulf of Mexico were examined using satellite observations and model simulations. It was important that both satellite observations and model simulations were used, since satellite sensors were sensitive to cloud interference, heavy rainfall, and only provided measurements near the ocean surface during hurricane periods. This study utilized 1/25° nested HYCOM simulations, 1/20° biophysical model simulations, and various satellite observations including QuikSCAT scatterometer winds, SeaWiFS and MODIS chlorophyll-a concentrations, and AVHRR and TMI sea surface temperatures. Such data were used to (1) assess the ocean surface response to Hurricanes Katrina, Rita, and Wilma of 2005 in the Gulf of Mexico, (2) examine the evolving three-dimensional (surface and subsurface) ocean response to Hurricane Katrina, and (3) analyze ecosystem dynamics, plankton biomass, and plankton distribution during Hurricane Katrina.

ISBN: 9781109050042Subjects--Topical Terms:

1019163
Physical Oceanography.

Analysis of the upper ocean response to hurricanes in the Gulf of Mexico using satellite observations and model simulations.
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245 1 0 $a Analysis of the upper ocean response to hurricanes in the Gulf of Mexico using satellite observations and model simulations.
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500 $a Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: 0915.
502 $a Thesis (Ph.D.)--University of South Carolina, 2009.
520 $a Biophysical responses of the upper ocean to hurricanes in the Gulf of Mexico were examined using satellite observations and model simulations. It was important that both satellite observations and model simulations were used, since satellite sensors were sensitive to cloud interference, heavy rainfall, and only provided measurements near the ocean surface during hurricane periods. This study utilized 1/25° nested HYCOM simulations, 1/20° biophysical model simulations, and various satellite observations including QuikSCAT scatterometer winds, SeaWiFS and MODIS chlorophyll-a concentrations, and AVHRR and TMI sea surface temperatures. Such data were used to (1) assess the ocean surface response to Hurricanes Katrina, Rita, and Wilma of 2005 in the Gulf of Mexico, (2) examine the evolving three-dimensional (surface and subsurface) ocean response to Hurricane Katrina, and (3) analyze ecosystem dynamics, plankton biomass, and plankton distribution during Hurricane Katrina.
520 $a Satellite observations of biophysical responses associated with Hurricanes Katrina, Rita, and Wilma of 2005 illustrated sea surface temperature changes of 6-7°C, 4-5°C, and 5-6°C, and chlorophyll-a enhancement of 3 mg m-3, 2 mg m-3, and 4 mg m-3. The degree and orientation of the responses exhibited were greatly affected by the oceanic processes that occurred within the Gulf of Mexico, as well as the translation speed of each hurricane. Satellite-detected surface responses associated with Hurricane Katrina occurred within a region from 23.5°-25.5°N and 85°-83°W. Analysis of model surface and subsurface dynamics in this region revealed strong upwelling/downwelling, wind-driven currents dominating the surface circulation, and near-inertial oscillations following Hurricane Katrina. The storm generated sea surface temperature cooling of 3-4°C and salinity freshening of 0.1-0.2. Analysis of heat-budget terms in the mixed layer indicated that wind-driven mixing dominated net upper-ocean cooling during hurricane passage, whereas at the mixed layer base temperature changes were largely due to vertical advection. Biophysical model simulations revealed that large phytoplankton were most responsive to hurricane-induced turbulent mixing and nutrient injection, with increases in biomass along the hurricane track. Small phytoplankton, microzooplankton, and mesozooplankton biomass primarily shifted in location and increased in spatial extent as a result of Hurricane Katrina. Hurricane passage disrupted the distribution of plankton biomass associated with mesoscale eddies.
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