Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-018-4500-0 |
ENSO influence over the Pacific North American sector: uncertainty due to atmospheric internal variability | |
Lopez, Hosmay1,2; Kirtman, Ben P.1 | |
2019-05-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:6149-6172 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The relative influence of El Nino Southern Oscillation (ENSO) forced response versus internally generated atmospheric variability or noise on the upper tropospheric Pacific North American circulation is investigated. The analysis is performed on the boreal winter (December-January-February) 200hPa circulation and the associated precipitation based on observational records and modeling experiments. The model experiment includes an ocean eddy-resolving coupled general circulation model (CGCM) and an atmospheric noise reduced ocean eddy-resolving CGCM. The noise reduction technique is the interactive ensemble approach, adopted to reduce the effects of internal atmospheric dynamics noise at the air-sea interface. Tropical rainfall anomalies associated with ENSO forces a teleconnection pattern that is a combination of the so-called Pacific North American (PNA) pattern, themed here as state-dependent atmospheric noise, and a pattern distinct from the PNA, themed here as ENSO-signal. The ENSO signal has a meridional structure in the streamfunction associated with significant poleward Rossby wave flux emanating from the eastern Pacific. Conversely, the PNA teleconnection pattern is zonally oriented, with most of the wave flux in the zonal direction from the Pacific towards North America. The mid-latitude ENSO forced response is asymmetric between warm and cold events. This asymmetry is strongly dependent on the amplitude of atmospheric noise. It is shown that the ENSO forced response is masked by atmospheric noise, with the latter being 3-10 times larger in amplitude. We show that the PNA pattern was positive during the 2015-2016 boreal winter and prevented the large 2015-2016 El Nino event from alleviating the persistent drought in the western US. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465441400062 |
WOS关键词 | EL-NINO ; PART II ; CLIMATE ; CALIFORNIA ; PRECIPITATION ; TEMPERATURE ; DROUGHT ; SENSITIVITY ; ASYMMETRY ; RAINFALL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/182638 |
专题 | 气候变化 |
作者单位 | 1.Univ Miami, Cooperat Inst Marine & Atmospher Studies, Miami, FL 33136 USA; 2.NOAA, Atlantic Oceanog & Meteorol Lab, Miami, FL 33149 USA |
推荐引用方式 GB/T 7714 | Lopez, Hosmay,Kirtman, Ben P.. ENSO influence over the Pacific North American sector: uncertainty due to atmospheric internal variability[J]. CLIMATE DYNAMICS,2019,52:6149-6172. |
APA | Lopez, Hosmay,&Kirtman, Ben P..(2019).ENSO influence over the Pacific North American sector: uncertainty due to atmospheric internal variability.CLIMATE DYNAMICS,52,6149-6172. |
MLA | Lopez, Hosmay,et al."ENSO influence over the Pacific North American sector: uncertainty due to atmospheric internal variability".CLIMATE DYNAMICS 52(2019):6149-6172. |
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