DOI: 10.1175/JCLI-D-17-0771.1
Scopus记录号: 2-s2.0-85054085281
论文题名: Can ENSO-like convection force an ENSO-like extratropical response on subseasonal time scales?
作者: Goss M. ; Lee S. ; Feldstein S.B. ; Diffenbaugh N.S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 20 起始页码: 8339
结束页码: 8349
语种: 英语
英文关键词: Atmospheric circulation
; ENSO
; Pacific-North American pattern/oscillation
; Seasonal forecasting
; Seasonal variability
; Tropical variability
Scopus关键词: Atmospheric pressure
; Time measurement
; Atmospheric circulation
; ENSO
; North American
; Seasonal forecasting
; Seasonal variability
; Tropical variability
; Climatology
英文摘要: A daily El Niño-Southern Oscillation (ENSO) index is developed based on precipitation rate and is used to investigate subseasonal time-scale extratropical circulation anomalies associated with ENSO-like convective heating. The index, referred to as the El Niño precipitation index (ENPI), is anomalously positive when there is El Niño-like convection. Conversely, the ENPI is anomalously negative when there is La Niña-like convection. It is found that when precipitation becomes El Niño-like (La Niña-like) on subseasonal time scales, the 300-hPa geopotential height field over the North Pacific and western North America becomes El Niño-like (La Niña-like) within 5-10 days. The composites show a small association with the MJO. These results are supported by previous modeling studies, which show that the response over the North Pacific and western North America to an equatorial Pacific heating anomaly occurs within about one week. This suggests that the mean seasonal extratropical response to El Niño (La Niña) may in effect simply be the average of the subseasonal response to subseasonally varying El Niño-like (La Niña-like) convective heating. Implications for subseasonal to seasonal forecasting are discussed. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110670
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: Department of Meteorology, The Pennsylvania State University, University Park, PA, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States; Woods Institute for the Environment, Stanford University, Stanford, CA, United States
Recommended Citation:
Goss M.,Lee S.,Feldstein S.B.,et al. Can ENSO-like convection force an ENSO-like extratropical response on subseasonal time scales?[J]. Journal of Climate,2018-01-01,31(20)