DOI: 10.1007/s00382-013-1684-1
Scopus记录号: 2-s2.0-84881028299
论文题名: Local kinetic energy budget of high-frequency and intermediate-frequency eddies: Winter climatology and interannual variability
作者: Jiang T. ; Deng Y. ; Li W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-03-04 起始页码: 961
结束页码: 976
语种: 英语
英文关键词: Eddy-eddy interaction
; High-frequency eddies
; Intermediate-frequency eddies
; Kinetic energy
英文摘要: The local budget of eddy kinetic energy (EKE) for both high-frequency (HF, 2-6 days) and intermediate-frequency (IF, 7-29 days) eddies are evaluated for Northern Hemisphere boreal winter using the 31-year (1979/80-2010/11) NCEP-DOE reanalysis. A new form of EKE equation is used to isolate the kinetic energy generation/destruction due to interactions among eddies of different timescales. The main source of HF EKE is baroclinic conversion that is concentrated in the mid-lower troposphere. Barotropic conversion mainly damps HF EKE and shows positive contributions to IF EKE on the northern flank of the winter-mean tropospheric jet. Interaction between HF and IF eddies acts as a sink for HF EKE and a main source for IF EKE, especially over the eastern ocean basins, confirming the substantial role of synoptic-scale transients in the development of IF phenomena such as atmospheric blocking. Large interannual variability is found for various EKE budget terms. The HF EKE response to El Niño is characterized by a dipole (tri-pole) anomaly over the North Pacific (North Atlantic). Baroclinic conversion is the main driver of the observed changes in HF EKE while barotropic conversion, interaction between HF and IF eddies, and energy flux convergence all play non-negligible roles in determining the final meridional structure of the HF EKE anomalies. Associated with El Niño, IF EKE generally decreases over the North Pacific and increases over the North Atlantic, which mainly result from changes in baroclinic conversion and EKE conversion due to eddy-eddy interactions. The latter is dominated by interaction between IF and LF (low-frequency, 30-90 days) eddies over the North Pacific, and by interactions between HF and IF eddies, and between IF and LF eddies over the North Atlantic. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54841
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA, 30332-0340, United States; Earth and Ocean Sciences, Nicholas School, Duke University, Durham, NC, United States
Recommended Citation:
Jiang T.,Deng Y.,Li W.. Local kinetic energy budget of high-frequency and intermediate-frequency eddies: Winter climatology and interannual variability[J]. Climate Dynamics,2013-01-01,41(2017-03-04)