Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.4899 |
The effects of ENSO-types and SAM on the large-scale southern blockings | |
Oliveira, Flavio N. M.1,2; Ambrizzi, Tercio1 | |
2017-06-15 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | Brazil |
英文摘要 | In this observational study, the effects of the two types (Canonical and Modoki) of El Nino - Southern Oscillation (ENSO) and Southern Annular Mode (SAM) on the large-scale southern blockings are investigated using the NCEP Climate Forecast System Reanalysis (CFSR) dataset. The automated 2D blocking index used here removes those structures that do not represent a typical blocking pattern. The daily SAM and monthly ENSO indices are defined when their time coefficient of the empirical orthogonal function is above or below 0.5 and 1.0 standard deviation, respectively. This study indicates that the El Nino Modoki is the most favourable ENSO mechanism for blocking events during the southern cool season. In particular, when El Nino Modoki occurs with positive SAM and/or weak SAM it acts to increase the number of days of blocking over the Southwest Pacific, or when it occurs with the negative SAM acts to maintain the observed number of days of blocking over the Southeast Pacific. Also, increases in the number of days of blocking are found in the warm season over the Southeast Pacific when the canonical El Nino occurs with negative SAM. On the other hand, the long-term change in the annual number of days of blocking shows a strong (moderate) downward linear trend over the Southwest (Southeast) Pacific, as well as the two types of La Nina, their temporal distribution with a positive SAM appears as the major cause. |
英文关键词 | ENSO-types Southern Annular Modes Southern Hemisphere blockings |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404851400002 |
WOS关键词 | ROSSBY-WAVE PROPAGATION ; ANTARCTIC OSCILLATION ; EL-NINO ; HEMISPHERE BLOCKING ; CLIMATOLOGY ; PACIFIC ; VARIABILITY ; NORTHERN ; PATTERNS ; ANTICYCLONES |
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/37528 |
专题 | 气候变化 |
作者单位 | 1.Univ Sao Paulo, Dept Atmospher Sci, Rua Matao,1226 Cid Univ, BR-05508090 Sao Paulo, SP, Brazil; 2.Natl Inst Meteorol, Dist Meteorol 1, Manaus, Amazonas, Brazil |
推荐引用方式 GB/T 7714 | Oliveira, Flavio N. M.,Ambrizzi, Tercio. The effects of ENSO-types and SAM on the large-scale southern blockings[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(7). |
APA | Oliveira, Flavio N. M.,&Ambrizzi, Tercio.(2017).The effects of ENSO-types and SAM on the large-scale southern blockings.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(7). |
MLA | Oliveira, Flavio N. M.,et al."The effects of ENSO-types and SAM on the large-scale southern blockings".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.7(2017). |
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