DOI: 10.1175/JCLI-D-18-0164.1
Scopus记录号: 2-s2.0-85054078019
论文题名: Pacific decadal oscillation: Tropical Pacific forcing versus internal variability
作者: Zhang Y. ; Xie S.-P. ; Kosaka Y. ; Yang J.-C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 20 起始页码: 8265
结束页码: 8279
语种: 英语
英文关键词: Pacific decadal oscillation
; Pacific decadal oscillation
Scopus关键词: Atmospheric radiation
; Energy conversion
; Geophysics
; Sea level
; Surface waters
; Tropics
; Atmospheric variability
; Internal variability
; Northern hemisphere annular modes
; Pacific decadal oscillation
; Radiative forcings
; Sea surface temperature (SST)
; Southern hemisphere annular modes
; Symmetric structures
; Climate change
英文摘要: The Pacific decadal oscillation (PDO) is the leading mode of sea surface temperature (SST) variability over the North Pacific (north of 20°N). Its South Pacific counterpart (south of 20°S) is the South Pacific decadal oscillation (SPDO). The effects of tropical eastern Pacific (TEP) SST forcing and internal atmospheric variability are investigated for both the PDO and SPDO using a 10-member ensemble tropical Pacific pacemaker experiment. Each member is forced by the historical radiative forcing and observed SST anomalies in the TEP region. Outside the TEP region, the ocean and atmosphere are fully coupled and freely evolve. The TEP-forced PDO (54% variance) and SPDO (46% variance) are correlated in time and exhibit a symmetric structure about the equator, driven by the Pacific-North American (PNA) and Pacific-South American teleconnections, respectively. The internal PDO resembles the TEP-forced component but is related to internal Aleutian low (AL) variability associated with the Northern Hemisphere annular mode and PNA pattern. The internal variability is locally enhanced by barotropic energy conversion in the westerly jet exit region around the Aleutians. By contrast, barotropic energy conversion is weak associated with the internal SPDO, resulting in weak geographical preference of sea level pressure variability. Therefore, the internal SPDO differs from the TEP-forced component, featuring SST anomalies along ~60°S in association with the Southern Hemisphere annular mode. The limitations on isolating the internal component from observations are discussed. Specifically, internal PDO variability appears to contribute significantly to the North Pacific regime shift in the 1940s. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110665
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Physical Oceanography Laboratory, Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, China; Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
Recommended Citation:
Zhang Y.,Xie S.-P.,Kosaka Y.,et al. Pacific decadal oscillation: Tropical Pacific forcing versus internal variability[J]. Journal of Climate,2018-01-01,31(20)