語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
Can the Response to Global Warming B...
~
Kohyama, Tsubasa.
FindBook
Google Book
Amazon
博客來
Can the Response to Global Warming Be La Nina-like?
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Can the Response to Global Warming Be La Nina-like?/
作者:
Kohyama, Tsubasa.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:
125 p.
附註:
Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.
Contained By:
Dissertation Abstracts International79-05B(E).
標題:
Climate change. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10684564
ISBN:
9780355596694
Can the Response to Global Warming Be La Nina-like?
Kohyama, Tsubasa.
Can the Response to Global Warming Be La Nina-like?
- Ann Arbor : ProQuest Dissertations & Theses, 2017 - 125 p.
Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.
Thesis (Ph.D.)--University of Washington, 2017.
The majority of the models that participated in the Coupled Model Intercomparison Project Phase 5 global warming experiments warm faster in the eastern equatorial Pacific Ocean than in the west. GFDL-ESM2M is an exception among the state-of-the-art global climate models in that the equatorial Pacific sea surface temperature (SST) in the west warms faster than in the east, and the Walker circulation strengthens in response to warming. This dissertation shows that this ``La Nina-like" response simulated by GFDL-ESM2M could be a physically consistent response to warming, and that the forced response may be detectable during this century.
ISBN: 9780355596694Subjects--Topical Terms:
2079509
Climate change.
Can the Response to Global Warming Be La Nina-like?
LDR
:05297nmm a2200349 4500
001
2201131
005
20190405084458.5
008
201008s2017 ||||||||||||||||| ||eng d
020
$a
9780355596694
035
$a
(MiAaPQ)AAI10684564
035
$a
(MiAaPQ)washington:18051
035
$a
AAI10684564
040
$a
MiAaPQ
$c
MiAaPQ
100
1
$a
Kohyama, Tsubasa.
$3
3427857
245
1 0
$a
Can the Response to Global Warming Be La Nina-like?
260
1
$a
Ann Arbor :
$b
ProQuest Dissertations & Theses,
$c
2017
300
$a
125 p.
500
$a
Source: Dissertation Abstracts International, Volume: 79-05(E), Section: B.
500
$a
Adviser: Dennis L. Hartmann.
502
$a
Thesis (Ph.D.)--University of Washington, 2017.
520
$a
The majority of the models that participated in the Coupled Model Intercomparison Project Phase 5 global warming experiments warm faster in the eastern equatorial Pacific Ocean than in the west. GFDL-ESM2M is an exception among the state-of-the-art global climate models in that the equatorial Pacific sea surface temperature (SST) in the west warms faster than in the east, and the Walker circulation strengthens in response to warming. This dissertation shows that this ``La Nina-like" response simulated by GFDL-ESM2M could be a physically consistent response to warming, and that the forced response may be detectable during this century.
520
$a
To highlight the uniqueness of GFDL-ESM2M, two other models are also examined: GFDL-ESM2G, which differs from GFDL-ESM2M only in the oceanic components, warms without a clear change in the zonal SST gradient in the tropical Pacific; HadGEM2-CC exhibits a warming pattern that resembles the multi-model mean, with more warming in the eastern than western Pacific. A fundamental observed constraint between the amplitude of the El Nino Southern Oscillation (ENSO) and the mean-state zonal SST gradient is reproduced well by GFDL-ESM2M, but not by the other two models, which display substantially weaker ENSO nonlinearity than is observed. Under this constraint, the weakening nonlinear ENSO amplitude in GFDL-ESM2M rectifies the mean state to be La Nina-like. GFDL-ESM2M exhibits more realistic equatorial thermal stratification than GFDL-ESM2G, which appears to be the most important difference for the ENSO nonlinearity and the warming response. On longer time scales, the weaker polar amplification in GFDL-ESM2M may also explain the origin of the colder equatorial upwelling water, which could in turn weaken the ENSO amplitude.
520
$a
Using an idealized model, we further explore the cause of this exceptional response and propose a new mechanism, the Nonlinear ENSO Warming Suppression (NEWS), where the transient heating rate difference between the atmospheric and oceanic reservoirs annihilates extreme El Ninos, causing a suppression of mean-state warming in the east. Heat budget analyses of GFDL-ESM2M robustly show that nonlinear dynamical heating, which is necessary for extremely warm El Ninos, becomes negligible under warming. An idealized nonlinear recharge oscillator model suggests that, if the temperature difference between the atmospheric and oceanic reservoirs becomes larger than some threshold value, the upwelling becomes too efficient for ENSO to retain its nonlinearity. Therefore, extreme El Ninos dissipate but La Ninas remain almost unchanged, causing a La Nina-like mean-state warming. NEWS is consistent with observations and GFDL-ESM2M but not with the majority of state-of-the-art models, which lack realistic ENSO nonlinearity. NEWS and its opposite response to atmospheric cooling, the Nonlinear ENSO Cooling Suppression (NECS), might contribute to the Pacific multi-decadal natural variability and global warming hiatuses.
520
$a
Then, to explore necessary conditions of NEWS, the ENSO amplitude response to global warming is examined in two global climate models with realistic nonlinearity of the El Nino Southern Oscillation (ENSO). GFDL-ESM2M and MIROC5 are the two models that exhibit realistic ENSO nonlinearity. With quadrupled atmospheric carbon dioxide, the ENSO amplitude of GFDL-ESM2M decreases by about 40%, whereas that of MIROC5 remains almost constant. Because GFDL-ESM2M exhibits stronger climatological thermal stratification than MIROC5, greenhouse gas forcing increases the upper ocean stability and causes the thermocline to be less sensitive to wind perturbations. The stiffer thermocline inhibits the large, nonlinear variations of subsurface temperature anomalies so that the ENSO amplitude substantially weakens. Idealized nonlinear recharge oscillator model experiments further support climatological thermal stratification as a determinant of the warming response. Observations exhibit stronger thermal stratification than both models, so the real world may terminate strong, nonlinear El Ninos sooner than model-based projections. Based on the NEWS mechanism, this physical explanation for the termination of extreme El Ninos supports the notion that the response to global warming could be La Nina-like.
590
$a
School code: 0250.
650
4
$a
Climate change.
$2
bicssc
$3
2079509
650
4
$a
Atmospheric sciences.
$3
3168354
650
4
$a
Physical oceanography.
$3
3168433
690
$a
0404
690
$a
0725
690
$a
0415
710
2
$a
University of Washington.
$b
Atmospheric Sciences.
$3
3174193
773
0
$t
Dissertation Abstracts International
$g
79-05B(E).
790
$a
0250
791
$a
Ph.D.
792
$a
2017
793
$a
English
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10684564
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9377680
電子資源
11.線上閱覽_V
電子書
EB
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入