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A dynamical understanding of stratos...

Kim, Junsu.

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A dynamical understanding of stratospheric influences on tropospheric climate and the ocean.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A dynamical understanding of stratospheric influences on tropospheric climate and the ocean./
作者:	Kim, Junsu.
面頁冊數:	134 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-08(E), Section: B.
Contained By:	Dissertation Abstracts International75-08B(E).
標題:	Atmospheric Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3619853
ISBN:	9781303894138

A dynamical understanding of stratospheric influences on tropospheric climate and the ocean.
Kim, Junsu.

A dynamical understanding of stratospheric influences on tropospheric climate and the ocean. - 134 p.

Source: Dissertation Abstracts International, Volume: 75-08(E), Section: B.

Thesis (Ph.D.)--The University of Utah, 2014.

Changes in the stratospheric circulation have the potential to affect weather and climate in the troposphere, especially over the high latitudes. In order to better understand such influences, we analyze the relationships among stratospheric, tropospheric, and oceanic variability. We reach our goal with the aid of coupled chemistry-climate models and coupled atmosphere-ocean models.

ISBN: 9781303894138Subjects--Topical Terms:

1019179
Atmospheric Sciences.

A dynamical understanding of stratospheric influences on tropospheric climate and the ocean.
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245 1 2 $a A dynamical understanding of stratospheric influences on tropospheric climate and the ocean.
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500 $a Source: Dissertation Abstracts International, Volume: 75-08(E), Section: B.
500 $a Adviser: Thomas Reichler.
502 $a Thesis (Ph.D.)--The University of Utah, 2014.
520 $a Changes in the stratospheric circulation have the potential to affect weather and climate in the troposphere, especially over the high latitudes. In order to better understand such influences, we analyze the relationships among stratospheric, tropospheric, and oceanic variability. We reach our goal with the aid of coupled chemistry-climate models and coupled atmosphere-ocean models.
520 $a Over the past decades, ozone depletion in the Antarctic stratosphere has been accelerating the poleward side of the stratospheric polar vortex. We suspect that the change in the winds in turn affects the concentrations of ozone. This idea is investigated with coupled chemistry-climate models. We find a strong indication for the existence of a positive feedback between ozone depletion and change in the circulation: the chemical ozone loss feeds back into the stratospheric circulation, and changes in the circulation produce more ozone deficit.
520 $a Climate models tend to systematically overestimate the persistence time scale of extratropical variability, in particular over the Southern Hemisphere. The systematic overestimation in climate models raises the concern that the models are overly sensitive to external forcings and that future projections based on those models are unreliable. We investigate issues concerning the persistence time scale of the annular mode using reanalysis and model data. We find that the 50-year record of historical observations is probably too short to derive a stable estimate of the annular mode time scale that may be used to evaluate climate models. We also find a robust relationship between the magnitude and the seasonal timing of the time scale in both stratosphere and troposphere, confirming and extending earlier results of a dynamical coupling between the stratosphere and the troposphere and of influences of stratospheric variability on the troposphere.
520 $a Extreme events in the stratosphere are known to alter tropospheric weather and climate. However, it is still unclear whether the stratosphere also has the capacity to affect the ocean and its circulation. This possibility is suggested from observations which show low-frequency covariability between the stratosphere and the Atlantic thermohaline circulation. We use simulations from coupled atmosphere-ocean models to explore more systematically a possible stratospheric influence on the oceanic circulation over the North Atlantic Ocean on multidecadal time scales. Our analysis identifies the stratosphere as a previously unknown source for decadal climate variability in the troposphere and suggests that the stratosphere forms an important component of climate that should be well represented in models.
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650 4 $a Climate Change. $3 894284
650 4 $a Atmospheric Chemistry. $3 1669583
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710 2 $a The University of Utah. $b Atmospheric Sciences. $3 2106159
773 0 $t Dissertation Abstracts International $g 75-08B(E).
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