DOI: 10.1007/s00382-012-1477-y
Scopus记录号: 2-s2.0-84874336413
论文题名: Favorable connections between seasonal footprinting mechanism and El Niño
作者: Park J.-Y. ; Yeh S.-W. ; Kug J.-S. ; Yoon J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-05-06 起始页码: 1169
结束页码: 1181
语种: 英语
英文关键词: El Nino
; North Pacific Oscillation
; Seasonal footprinting mechanism
英文摘要: Previous studies suggested that the wintertime SST in the North Pacific that are generated by the concurrent North Pacific Oscillation (NPO) are able to force El Niño during subsequent winter via the so-called 'seasonal footprinting mechanism' (SFM). We examine how the NPO effectively generates the El Niño via the SFM in the observations and models. The occurrence ratio for El Niño under conditions of NPO forcing during the previous winters is about 41 % for the period of 61 years (1949-2009), indicating that the atmospheric forcing from the mid-latitudes through the SFM does not always trigger an El Niño. We observed certain favorable conditions under which the SFM may effectively induce El Niño. We directly compared these observations with two cases: when the wintertime NPO leads to El Niño during the following winter through the SFM, and when the wintertime NPO is not followed by El Niño. Our analysis demonstrates that the spatial structures of the NPO, associated wind speed and net heat flux in the northeast Pacific, differ between the two cases. Such differences determine the existence of a footprint SST in the northeastern Pacific during the late spring and summer, which plays a key role in initiating the El Niño via the projection of westerly wind stress anomalies onto the equatorial Pacific during the same seasons. By conducting linear baroclinic model experiments, it is found that the positions of La Niña SST forcing during the previous winter are able to modify the spatial structures of the NPO, which produces favorable conditions for the El Niño during subsequent winter via the SFM. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54960
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Korea Institute of Ocean Science and Technology, Ansan, South Korea; Department of Environmental Marine Science, Hanyang University, 1271 Sa-3-dong, Ansan, 426-791, South Korea; Department of Meteorology, Hawaii University, Honolulu, HI, United States
Recommended Citation:
Park J.-Y.,Yeh S.-W.,Kug J.-S.,et al. Favorable connections between seasonal footprinting mechanism and El Niño[J]. Climate Dynamics,2013-01-01,40(2017-05-06)