DOI: 10.1175/JCLI-D-16-0411.1
Scopus记录号: 2-s2.0-85017505772
论文题名: Formation mechanisms of the Pacific-North American teleconnection with and without its canonical tropical convection pattern
作者: Dai Y. ; Feldstein S.B. ; Tan B. ; Lee S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 9 起始页码: 3139
结束页码: 3155
语种: 英语
Scopus关键词: Digital storage
; Tropical engineering
; Tropics
; Circumglobal teleconnection patterns
; Formation mechanism
; High-frequency eddies
; North American
; Teleconnection patterns
; Tropical convection
; Wave amplification
; Wave-activity flux
; Fluxes
英文摘要: The mechanisms that drive the Pacific-North American (PNA) teleconnection pattern with and without its canonical tropical convection pattern are investigated with daily ERA-Interim and NOAA OLR data (the former pattern is referred to as the convective PNA, and the latter pattern is referred to as the nonconvective PNA). Both the convective and nonconvective positive PNA are found to be preceded by wave activity fluxes associated with a Eurasian wave train. These wave activity fluxes enter the central subtropical Pacific, a location that is favorable for barotropic wave amplification, just prior to the rapid growth of the PNA. The wave activity fluxes are stronger for the positive nonconvective PNA, suggesting that barotropic amplification plays a greater role in its development. The negative convective PNA is also preceded by a Eurasian wave train, whereas the negative nonconvective PNA grows from the North Pacific contribution to a circumglobal teleconnection pattern. Driving by high-frequency eddy vorticity fluxes is largest for the negative convective PNA, indicating that a positive feedback may be playing a more dominant role in its development. The lifetimes of convective PNA events are found to be longer than those of nonconvective PNA events, with the former (latter) persisting for about three (two) weeks. Furthermore, the frequency of the positive (negative) convective PNA is about 40% (60%) greater than that of the positive (negative) nonconvective PNA. © 2017 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49702
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 Sciences, School of Physics, Peking University, Beijing, China; Department of Meteorology, The Pennsylvania State University, University Park, PA, United States; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
Recommended Citation:
Dai Y.,Feldstein S.B.,Tan B.,et al. Formation mechanisms of the Pacific-North American teleconnection with and without its canonical tropical convection pattern[J]. Journal of Climate,2017-01-01,30(9)