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Land surface and ocean effects on th...

Lee, Eungul.

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Land surface and ocean effects on the variabilities of three Asian summer monsoons.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Land surface and ocean effects on the variabilities of three Asian summer monsoons./
Author:	Lee, Eungul.
Description:	129 p.
Notes:	Adviser: Thomas N. Chase.
Contained By:	Dissertation Abstracts International68-11B.
Subject:	Atmospheric Sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284433
ISBN:	9780549314868

Land surface and ocean effects on the variabilities of three Asian summer monsoons.
Lee, Eungul.

Land surface and ocean effects on the variabilities of three Asian summer monsoons. - 129 p.

Adviser: Thomas N. Chase.

Thesis (Ph.D.)--University of Colorado at Boulder, 2007.

The effects on the variabilities of three Asian summer monsoons of changes in recent land surface and ocean heat sources are examined using the results from several observational analyses and modeling simulations.

ISBN: 9780549314868Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Land surface and ocean effects on the variabilities of three Asian summer monsoons.
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020 $a 9780549314868
035 $a (UMI)AAI3284433
035 $a AAI3284433
040 $a UMI $c UMI
100 1 $a Lee, Eungul. $3 1266261
245 1 0 $a Land surface and ocean effects on the variabilities of three Asian summer monsoons.
300 $a 129 p.
500 $a Adviser: Thomas N. Chase.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7206.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2007.
520 $a The effects on the variabilities of three Asian summer monsoons of changes in recent land surface and ocean heat sources are examined using the results from several observational analyses and modeling simulations.
520 $a We find that the East Asian summer monsoon (EASM) can be subdivided into a northern and a southern component with distinctly different driving mechanisms. The northern EASM (NEASM) is affected by heat sources in the tropical oceans related to El Nino events, while the southern EASM (SEASM) is affected by the subtropical oceans related to a North Pacific sea surface temperature (SST) dipole mode. A stronger NEASM is related to above-normal western North Pacific anticyclonic anomalies, while a stronger SEASM is related to below-normal western North Pacific anticyclonic anomalies. These anticyclonic anomalies are connected to SST anomalies in the tropical and subtropical Pacific during the pre-monsoon season (December&sim;May).
520 $a We provide evidence that decreased July sensible heat flux in the Indian subcontinent (an expected result of increased soil moisture due to irrigation and increased vegetation) leads to a reduced land-sea thermal contrast, which is one of the driving factors for the monsoon, and therefore weakens the monsoon circulation. Thus, a weak early Indian summer monsoon appears to be at least partially a result of irrigation and the resultant increased vegetation activity during the preceding spring.
520 $a EASM precipitation can be predicted from land and ocean factors during the pre-monsoon season using a linear regression model. Statistical forecast models of the EASM using land cover conditions in addition to ocean heat sources double and triple, respectively, the predictive skill of the NEASM and SEASM forecasting models relative to models using ocean factors alone. This work highlights the, as yet, undocumented importance of seasonal land cover in monsoon prediction and the role of the biosphere in the climate system as a whole. We also detail the physical mechanisms involved in these land-surface forcings.
520 $a The plausibility and reproducibility of the relationship and physical mechanisms proposed between the NEASM and El Nino are verified and illuminated with a coupled climate model. A significantly intensified NEASM is simulated for an El Nino run, which validates the positive correlation between NEASM precipitation and SST anomalies in the tropical eastern Pacific found in recent observational analysis. Analysis of lower-level wind vector and vorticity in the model experiments elucidates the physical mechanism behind the positive correlation between NEASM precipitation and El Nino, and shows that the western North Pacific anticyclone plays an important role in the connection between the NEASM and the tropical eastern Pacific SST anomalies.
590 $a School code: 0051.
650 4 $a Atmospheric Sciences. $3 1019179
650 4 $a Hydrology. $3 545716
650 4 $a Physical Geography. $3 893400
690 $a 0368
690 $a 0388
690 $a 0725
710 2 $a University of Colorado at Boulder. $b Geography. $3 1038086
773 0 $t Dissertation Abstracts International $g 68-11B.
790 $a 0051
790 1 0 $a Barry, Roger G. $e committee member
790 1 0 $a Blanken, Peter D. $e committee member
790 1 0 $a Chase, Thomas N., $e advisor
790 1 0 $a Noone, David C. $e committee member
790 1 0 $a Rajagopalan, Balaji $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3284433