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On the role of eddies in monsoonal c...

Bordoni, Simona.

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On the role of eddies in monsoonal circulations: Observations and theory.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	On the role of eddies in monsoonal circulations: Observations and theory./
作者:	Bordoni, Simona.
面頁冊數:	195 p.
附註:	Adviser: Bjorn Stevens.
Contained By:	Dissertation Abstracts International68-06B.
標題:	Atmospheric Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3268537
ISBN:	9780549079835

On the role of eddies in monsoonal circulations: Observations and theory.
Bordoni, Simona.

On the role of eddies in monsoonal circulations: Observations and theory. - 195 p.

Adviser: Bjorn Stevens.

Thesis (Ph.D.)--University of California, Los Angeles, 2007.

This dissertation explores the role that eddies play in monsoonal circulations and is comprised of an observational component and a modeling component. In the observational component, we use high-resolution satellite-derived observations and reanalysis data to explore the role that distinct transients, known as gulf surges, play in shaping important features, such as the precipitation distribution, of the North American monsoon.

ISBN: 9780549079835Subjects--Topical Terms:

1019179
Atmospheric Sciences.

On the role of eddies in monsoonal circulations: Observations and theory.
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520 $a This dissertation explores the role that eddies play in monsoonal circulations and is comprised of an observational component and a modeling component. In the observational component, we use high-resolution satellite-derived observations and reanalysis data to explore the role that distinct transients, known as gulf surges, play in shaping important features, such as the precipitation distribution, of the North American monsoon.
520 $a Six-years of QuikSCAT winds show that the onset of the summer rains is associated with a seasonal reversal of the low-level flow along the GoC, and with the establishment of a time-mean southerly wind throughout the gulf. In the core of the monsoon season, the time-mean flow is found to be composed of periods of enhanced southerly winds associated with gulf surges. A principal component analysis, which identifies these transients as the leading mode of synoptic-scale variability of the summertime low-level flow along the GoC, is used to develop an objective index of gulf surge occurrence. Regression analyses on the gulf surge index show that, although seemingly mesoscale features confined along the GoC, gulf surges are intimately linked to patterns of large-scale variability of the eastern Pacific ITCZ and greatly contribute to the definition of the northward extent of the monsoonal rains.
520 $a In the modeling component, we use idealized GCM experiments to investigate the influence of large-scale baroclinic eddies on the tropical meridional overturning circulation and, possibly, on the large-scale monsoon. The simulations show that, in the course of simulated seasonal cycles, the Hadley cells undergo regime transitions from a regime in which midlatitude eddy momentum fluxes strongly influence the Hadley cell strength, to a regime in which the influence of the eddy momentum fluxes is weak. The regime transitions resemble the onset and end of monsoons, in rapid shifts in the location of the precipitation zones, rapid changes in the intensity of the precipitation, and changes in direction and strength of the zonal winds. These results de-emphasize the traditional view of monsoons as circulations driven by land-sea contrasts and identify feedbacks between the large-scale baroclinic eddies and the mean flow as fundamental dynamical mechanisms involved in monsoon dynamics.
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