Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-18-0746.1 |
On the Linearity of the Stratospheric and Euro-Atlantic Sector Response to ENSO | |
Trascasa-Castro, Paloma1; Maycock, Amanda C.1; Yiu, Yu Yeung Scott2; Fletcher, Jennifer K.1 | |
2019-10-01 | |
发表期刊 | JOURNAL OF CLIMATE
![]() |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:19页码:6607-6626 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | The dependence of the winter stratospheric and Euro-Atlantic climate response on ENSO amplitude is investigated using the HadGEM3 model. Experiments are performed with imposed east Pacific sea surface temperature perturbations corresponding to Nino-3.4 anomalies of +/- 0.75, 1.5, 2.25, and 3.0 K. In the North Pacific, El Nino (EN) deepens and shifts the Aleutian low eastward, while the equivalent magnitude La Nina (LN) perturbations drive anomalies of opposite sign that are around 4 times weaker. The muted North Pacific response to LN can be traced back to the weaker response of tropical convection and the associated anomalous Rossby wave source. The EN perturbations weaken the Arctic polar vortex, with the winter mean zonal mean zonal wind at 60 degrees N and 10 hPa decreasing approximately linearly with Nino-3.4 anomaly by around -3.6 m s(-1) K-1. For the strongest EN case (+3 K), the frequency of sudden stratospheric warmings (SSWs) increases by similar to 60% compared to the control experiment. Hence the results do not support a saturation of the stratospheric pathway for strong EN as suggested in previous literature. The equivalent amplitude LN perturbations cause a weak strengthening of the polar vortex and no substantial change in SSW frequency, in contrast to some reanalysis-based studies. EN induces a negative North Atlantic Oscillation (NAO) index throughout boreal winter, which increases approximately linearly with the Nino-3.4 anomaly by around -0.6 standard deviations K-1. Only the response to the strongest LN perturbations projects onto a weak positive NAO in November, suggesting that the mechanism for the Euro-Atlantic response to LN may be distinct from EN. |
英文关键词 | ENSO Stratospheric circulation Teleconnections Stratosphere-troposphere coupling Climate variability North Atlantic Oscillation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000484936000001 |
WOS关键词 | NORTHERN WINTER STRATOSPHERE ; NINO-SOUTHERN-OSCILLATION ; SEA-SURFACE TEMPERATURES ; LOW-TOP VERSIONS ; EL-NINO ; ATMOSPHERIC RESPONSE ; ENSEMBLE SIMULATIONS ; CMIP5 SIMULATIONS ; SUDDEN WARMINGS ; BOREAL WINTER |
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/187434 |
专题 | 气候变化 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England; 2.Univ Cambridge, Dept Chem, Cambridge, England |
推荐引用方式 GB/T 7714 | Trascasa-Castro, Paloma,Maycock, Amanda C.,Yiu, Yu Yeung Scott,et al. On the Linearity of the Stratospheric and Euro-Atlantic Sector Response to ENSO[J]. JOURNAL OF CLIMATE,2019,32(19):6607-6626. |
APA | Trascasa-Castro, Paloma,Maycock, Amanda C.,Yiu, Yu Yeung Scott,&Fletcher, Jennifer K..(2019).On the Linearity of the Stratospheric and Euro-Atlantic Sector Response to ENSO.JOURNAL OF CLIMATE,32(19),6607-6626. |
MLA | Trascasa-Castro, Paloma,et al."On the Linearity of the Stratospheric and Euro-Atlantic Sector Response to ENSO".JOURNAL OF CLIMATE 32.19(2019):6607-6626. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论