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The Effect of Orbital Forcing on the...

Rushley, Stephanie S.

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The Effect of Orbital Forcing on the MJO's Amplitude and Phase Speed.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Effect of Orbital Forcing on the MJO's Amplitude and Phase Speed./
Author:	Rushley, Stephanie S.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	142 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
Contained By:	Dissertations Abstracts International81-11B.
Subject:	Atmospheric sciences. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27744849
ISBN:	9798641790923

The Effect of Orbital Forcing on the MJO's Amplitude and Phase Speed.
Rushley, Stephanie S.

The Effect of Orbital Forcing on the MJO's Amplitude and Phase Speed. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 142 p.

Source: Dissertations Abstracts International, Volume: 81-11, Section: B.

Thesis (Ph.D.)--University of Washington, 2020.

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

The Madden-Julian Oscillation (MJO) has a pronounced seasonal cycle, drifting from the Southern Hemisphere in boreal winter to the Northern Hemisphere in boreal summer, with a maximum intensity during boreal winter in the Southern Hemisphere. The reason for this maximum intensity during boreal winter is not fully understood. In this study we perturbed the seasonal cycle in the Superparameterized Community Atmosphere Model, which reasonably represents the MJO, by changing Earth's orbital parameters. In response to the orbital forcing, boreal winter mean precipitation increases, consistent with a stronger Hadley circulation, and the mean lower-tropospheric westerly winds shift southward over the Indo-Pacific warm pool. The increase in the tropical precipitation variance are explained using the linearized approximation of the non-linear moisture-precipitation relationship. The increase in the tropical precipitation variance is mostly due to a decrease in the convective moisture adjustment timescale, which is mainly due to the increase in mean precipitation. The seasonal cycle of the MJO is amplified, with the largest increases in the MJO's precipitation variance occuring during boreal winter. The changes in the convective moisture adjustment timescale and MJO scale moisture predict a larger increase in the MJO precipitation variance than in the tropical precipitation variance. Additionally, a weaker damping effect from the latent heat flux is found due to the southward shift in the mean lower tropospheric westerlies.

ISBN: 9798641790923Subjects--Topical Terms:

3168354
Atmospheric sciences.
Subjects--Index Terms:

Madden-Julian Oscillation

The Effect of Orbital Forcing on the MJO's Amplitude and Phase Speed.
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245 1 4 $a The Effect of Orbital Forcing on the MJO's Amplitude and Phase Speed.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 142 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
500 $a Advisor: Kim, Daehyun.
502 $a Thesis (Ph.D.)--University of Washington, 2020.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The Madden-Julian Oscillation (MJO) has a pronounced seasonal cycle, drifting from the Southern Hemisphere in boreal winter to the Northern Hemisphere in boreal summer, with a maximum intensity during boreal winter in the Southern Hemisphere. The reason for this maximum intensity during boreal winter is not fully understood. In this study we perturbed the seasonal cycle in the Superparameterized Community Atmosphere Model, which reasonably represents the MJO, by changing Earth's orbital parameters. In response to the orbital forcing, boreal winter mean precipitation increases, consistent with a stronger Hadley circulation, and the mean lower-tropospheric westerly winds shift southward over the Indo-Pacific warm pool. The increase in the tropical precipitation variance are explained using the linearized approximation of the non-linear moisture-precipitation relationship. The increase in the tropical precipitation variance is mostly due to a decrease in the convective moisture adjustment timescale, which is mainly due to the increase in mean precipitation. The seasonal cycle of the MJO is amplified, with the largest increases in the MJO's precipitation variance occuring during boreal winter. The changes in the convective moisture adjustment timescale and MJO scale moisture predict a larger increase in the MJO precipitation variance than in the tropical precipitation variance. Additionally, a weaker damping effect from the latent heat flux is found due to the southward shift in the mean lower tropospheric westerlies.
590 $a School code: 0250.
650 4 $a Atmospheric sciences. $3 3168354
653 $a Madden-Julian Oscillation
653 $a Moisture mode
653 $a Seasonal cycle
690 $a 0725
710 2 $a University of Washington. $b Atmospheric Sciences. $3 3174193
773 0 $t Dissertations Abstracts International $g 81-11B.
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791 $a Ph.D.
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793 $a English
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