DOI: 10.1175/JCLI-D-14-00105.1
Scopus记录号: 2-s2.0-84907584463
论文题名: Pentad evolution of wintertime impacts of the Madden-Julian oscillation over the contiguous United States
作者: Baxter S. ; Weaver S. ; Gottschalck J. ; Xue Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 19 起始页码: 7356
结束页码: 7367
语种: 英语
Scopus关键词: Climate variability
; Madden-Julian oscillation
; air temperature
; air-sea interaction
; atmospheric convection
; climate prediction
; climate variation
; Madden-Julian oscillation
; precipitation (climatology)
; temperature anomaly
; velocity
; Great Lakes [North America]
; Pacific Coast [North America]
; Pacific Coast [United States]
; United States
英文摘要: Lagged pentad composites of surface air temperature and precipitation are analyzed for the winter season (December-February) to assess the influence of the Madden-Julian oscillation (MJO) on the climate of the contiguous United States. Composites are based on the Wheeler and Hendon MJO index as well as an index developed and maintained atNOAA's Climate Prediction Center (CPC), which is based on extended empirical orthogonal function analysis of upper-level velocity potential. Significant positive temperature anomalies develop in the eastern United States 5-20 days following Wheeler and Hendon MJO index phase 3, which corresponds to enhanced convection centered over the eastern Indian Ocean. At the same lag, positive precipitation anomalies are observed from the southern Plains to the Great Lakes region. Negative temperature anomalies appear in the central and eastern United States 10-20 days following Wheeler and Hendon MJO phase 7. These impacts are supported by an analysis of the evolution of 200-hPa geopotential height and zonal wind anomalies. Composites based on the CPC velocity potential MJO index generally yield similar results; however, they capture more cases since the index contains both interannual and subseasonal variability. There are some cases where the CPC index differs from that of WH in both MJO phase identification and its North American impacts, especially near the West Coast. This analysis suggests that MJO-related velocity potential anomalies can be used without the Wheeler and Hendon MJO index to predict MJO impacts. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51067
Appears in Collections: 气候变化事实与影响
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作者单位: NOAA/Climate Prediction Center, College Park, MD, United States
Recommended Citation:
Baxter S.,Weaver S.,Gottschalck J.,et al. Pentad evolution of wintertime impacts of the Madden-Julian oscillation over the contiguous United States[J]. Journal of Climate,2014-01-01,27(19)