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DOI | 10.1175/JCLI-D-18-0803.1 |
A Modeling- and Process-Oriented Study to Investigate the Projected Change of ENSO-Forced Wintertime Teleconnectivity in a Warmer World | |
Drouard, Marie1,2; Cassou, Christophe1 | |
2019-12-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:23页码:8047-8068 |
文章类型 | Article |
语种 | 英语 |
国家 | France; England |
英文摘要 | Considerable uncertainties remain about the expected changes of ENSO and associated teleconnectivity as the climate is warming. Two ensembles of pacemaker experiments using the CNRM-CM5 coupled model are designed in a perfect model framework to contrast ENSO-forced teleconnectivity between the preindustrial period versus a warmer background state (obtained from a long stabilized simulation under late-twenty-first-century RCP8.5 constant forcing). The most notable sensitivity to the mean background state is found over the North Atlantic, where the ENSO-NAO teleconnection is considerably reinforced in a warmer world. We attribute this change to (i) a stronger and eastward-extended mean upper-level jet over the North Pacific, (ii) an eastward-shifted ENSO teleconnection over the North Pacific, and (iii) an equatorward-shifted and reinforced mean jet over the North Atlantic. These altogether act as a more efficient waveguide, leading to a better penetration of synoptic storms coming from the Pacific into the Atlantic. This downstream penetration into the North Atlantic basin forces more systematically the NAO through wave breaking. The reinforcement in the teleconnection is asymmetrical with respect to the ENSO phase and is mainly sensitive to La Nina events. Even though the Pacific jet tends to retract westward and move northward during cold events, mean changes are such that both Pacific and Atlantic jets remain connected in a warmer climate by contrast to the preindustrial period, thus ensuring preferred anticyclonic wave breaking downstream over the North Atlantic leading ultimately to NAO+ events. |
英文关键词 | ENSO Teleconnections Climate change |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000494720800002 |
WOS关键词 | NORTH-ATLANTIC OSCILLATION ; TROPICAL PACIFIC RAINFALL ; EL-NINO TELECONNECTIONS ; ROSSBY-WAVE-BREAKING ; ATMOSPHERIC CIRCULATION ; SOUTHERN-OSCILLATION ; WEATHER REGIMES ; STRATOSPHERIC VARIABILITY ; CLIMATE ; ANOMALIES |
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/225629 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.CNRS, CECI, UMR 5318, CERFACS, Toulouse, France; 2.Univ Oxford, Atmospher Ocean & Planetary Phys, Oxford, England |
推荐引用方式 GB/T 7714 | Drouard, Marie,Cassou, Christophe. A Modeling- and Process-Oriented Study to Investigate the Projected Change of ENSO-Forced Wintertime Teleconnectivity in a Warmer World[J]. JOURNAL OF CLIMATE,2019,32(23):8047-8068. |
APA | Drouard, Marie,&Cassou, Christophe.(2019).A Modeling- and Process-Oriented Study to Investigate the Projected Change of ENSO-Forced Wintertime Teleconnectivity in a Warmer World.JOURNAL OF CLIMATE,32(23),8047-8068. |
MLA | Drouard, Marie,et al."A Modeling- and Process-Oriented Study to Investigate the Projected Change of ENSO-Forced Wintertime Teleconnectivity in a Warmer World".JOURNAL OF CLIMATE 32.23(2019):8047-8068. |
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