| DOI: | 10.1175/JCLI-D-14-00047.1
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| Scopus记录号: | 2-s2.0-84920272963
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| 论文题名: | The Indian ocean dipole: A monopole in SST |
| 作者: | Zhao Y.; Nigam S.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2015
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| 卷: | 28, 期:1 | | 起始页码: | 3
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| 结束页码: | 19
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| 语种: | 英语
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| Scopus关键词: | Atmospheric pressure
; Atmospheric temperature
; Climate change
; Climatology
; Rain
; Surface properties
; Surface waters
; Climate variability
; ENSO
; Indian ocean
; Pacific ocean
; Sea surface temperature (SST)
; Statistical techniques
; Oceanography
; annual variation
; climate variation
; El Nino-Southern Oscillation
; sea surface temperature
; spatiotemporal analysis
; statistical analysis
; temperature anomaly
; Indian Ocean
; Pacific Ocean
|
| 英文摘要: | The claim for a zonal-dipole structure in interannual variations of the tropical Indian Ocean (IO) SSTs-the Indian Ocean dipole (IOD)-is reexamined after accounting for El Niño-Southern Oscillation's (ENSO) influence. The authors seek an a priori accounting of ENSO's seasonally stratified influence on IO SSTs and evaluate the basis of the related dipole mode index, instead of seeking a posteriori adjustments to this index, as common. Scant observational evidence is found for zonal-dipole SST variations after removal of ENSO's influence from IO SSTs: The IOD poles are essentially uncorrelated in the ENSO-filtered SSTs in both recent (1958-98) and century-long (1900-2007) periods, leading to the breakdown of zonal-dipole structure in surface temperature variability; this finding does not depend on the subtleties in estimation of ENSO's influence. Deconstruction of the fall 1994 and 1997 SST anomalies led to their reclassification, with a weak IOD in 1994 and none in 1997. Regressions of the eastern IOD pole on upper-ocean heat content, however, do exhibit a zonal-dipole structure but with the western pole in the central-equatorial IO, suggesting that internally generated basin variability can have zonal-dipole structure at the subsurface. The IO SST variability was analyzed using the extended-EOF technique, after removing the influence of Pacific SSTs; the technique targets spatial and temporal recurrence and extracts modes (rather than patterns) of variability. This spatiotemporal analysis also does not support the existence of zonal-dipole variability at the surface. However, the analysis did yield a dipole-like structure in the meridional direction in boreal fall/ winter, when it resembles the subtropical IOD pattern (but not the evolution time scale). © 2015 American Meteorological Society. |
| 资助项目: | JPL, Jet Propulsion Laboratory
; NASA, Jet Propulsion Laboratory
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/50421
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Atmospheric and Oceanic Science, University of Maryland College Park, College Park, MD, United States
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| Recommended Citation: | |
Zhao Y.,Nigam S.. The Indian ocean dipole: A monopole in SST[J]. Journal of Climate,2015-01-01,28(1)
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