東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

The seasonal footprinting mechanism ...

Vimont, Daniel J.,

Linked to FindBook

Google Book

Amazon

博客來

The seasonal footprinting mechanism in the CSIRO coupled general circulation models and in observations /

Record Type:	Electronic resources : Monograph/item
Title/Author:	The seasonal footprinting mechanism in the CSIRO coupled general circulation models and in observations // Daniel J Vimont.
Author:	Vimont, Daniel J.,
Description:	1 electronic resource (91 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 63-12, Section: B.
Contained By:	Dissertations Abstracts International63-12B.
Subject:	Atmosphere. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3041069
ISBN:	9780493545035

The seasonal footprinting mechanism in the CSIRO coupled general circulation models and in observations /
Vimont, Daniel J.,

The seasonal footprinting mechanism in the CSIRO coupled general circulation models and in observations /Daniel J Vimont. - 1 electronic resource (91 pages)

Source: Dissertations Abstracts International, Volume: 63-12, Section: B.

The Seasonal Footprinting Mechanism (SFM) is defined herein. The SFM provides a means by which winter mid-latitude atmospheric variability over the North Pacific becomes an important external forcing of ENSO. During winter, when the mid-latitude atmosphere is most energetic, mid-latitude atmospheric variability imparts an SST "footprint" onto the ocean via changes in the net surface heat flux. This SST footprint persists into late spring and summer, when its subtropical portion forces an atmospheric circulation that includes zonal wind stress anomalies in the equatorial western Pacific. The coupled tropical system adjusts to these summer zonal wind stress anomalies, producing an ENSO-like pattern of variability. This dissertation combines an analysis of the SFM in a model framework with a separate analysis of the SFM in the observed record. While the latter analysis is more applicable for nature, the former plays a crucial role in providing a laboratory in which to distill the essential physics responsible for the SFM. The SFM is defined in the CSIRO coupled general circulation models. It is found that the SFM accounts for 25-50% of the model's interannual ENSO variability, and up to 75% of the model's interdecadal ENSO-like variability. Sensitivity experiments confirm an essential role of the oceanic mixed layer (and hence the SST footprint) in the northern tropics and subtropics, and highlight the importance of the seasonal response in creating zonal wind stress anomalies that influence the tropical ocean waveguide (and hence ENSO). The observed record suggests the SFM is a leading contributor to the stochastic forcing of ENSO. Two separate statistical analyses are presented, both of which yield results that closely resemble those from the CSIRO models. Both analyses indicate that ENSO is preceded by sea level pressure (SLP) anomalies that closely resemble the North Pacific Oscillation (NPO) during the preceding winter. It is shown that NPO-like SLP anomalies exhibit significant skill in predicting ENSO up to three seasons in advance. The strong relationships between the NPO and ENSO may enhance predictability of ENSO, and support the notion that ENSO may be in a linearly stable regime in nature.

English

ISBN: 9780493545035Subjects--Topical Terms:

542821
Atmosphere.
Subjects--Index Terms:

Climate variability

The seasonal footprinting mechanism in the CSIRO coupled general circulation models and in observations /
LDR:03778nmm a22004333i 4500 001 2396159
005 20250522083200.5
006 m o d
007 cr|nu||||||||
008 251215s2002 miu||||||m |||||||eng d
020 $a 9780493545035
035 $a (MiAaPQD)AAI3041069
035 $a AAI3041069
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Vimont, Daniel J., $e author. $3 3765754
245 1 0 $a The seasonal footprinting mechanism in the CSIRO coupled general circulation models and in observations / $c Daniel J Vimont.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2002
300 $a 1 electronic resource (91 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 63-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisors: Battisti, David S.; Sarachik, Edward S.
502 $b Ph.D. $c University of Washington $d 2002.
520 $a The Seasonal Footprinting Mechanism (SFM) is defined herein. The SFM provides a means by which winter mid-latitude atmospheric variability over the North Pacific becomes an important external forcing of ENSO. During winter, when the mid-latitude atmosphere is most energetic, mid-latitude atmospheric variability imparts an SST "footprint" onto the ocean via changes in the net surface heat flux. This SST footprint persists into late spring and summer, when its subtropical portion forces an atmospheric circulation that includes zonal wind stress anomalies in the equatorial western Pacific. The coupled tropical system adjusts to these summer zonal wind stress anomalies, producing an ENSO-like pattern of variability. This dissertation combines an analysis of the SFM in a model framework with a separate analysis of the SFM in the observed record. While the latter analysis is more applicable for nature, the former plays a crucial role in providing a laboratory in which to distill the essential physics responsible for the SFM. The SFM is defined in the CSIRO coupled general circulation models. It is found that the SFM accounts for 25-50% of the model's interannual ENSO variability, and up to 75% of the model's interdecadal ENSO-like variability. Sensitivity experiments confirm an essential role of the oceanic mixed layer (and hence the SST footprint) in the northern tropics and subtropics, and highlight the importance of the seasonal response in creating zonal wind stress anomalies that influence the tropical ocean waveguide (and hence ENSO). The observed record suggests the SFM is a leading contributor to the stochastic forcing of ENSO. Two separate statistical analyses are presented, both of which yield results that closely resemble those from the CSIRO models. Both analyses indicate that ENSO is preceded by sea level pressure (SLP) anomalies that closely resemble the North Pacific Oscillation (NPO) during the preceding winter. It is shown that NPO-like SLP anomalies exhibit significant skill in predicting ENSO up to three seasons in advance. The strong relationships between the NPO and ENSO may enhance predictability of ENSO, and support the notion that ENSO may be in a linearly stable regime in nature.
546 $a English
590 $a School code: 0250
650 4 $a Atmosphere. $3 542821
653 $a Climate variability
653 $a El Nino-Southern Oscillation
653 $a General circulation
653 $a Ocean-atmosphere interactions
653 $a Seasonal footprinting
690 $a 0725
710 2 $a University of Washington. $e degree granting institution. $3 3758996
720 1 $a Battisti, David S. $e degree supervisor.
720 1 $a Sarachik, Edward S. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 63-12B.
790 $a 0250
791 $a Ph.D.
792 $a 2002
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3041069