Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.4883 |
Long-term austral summer wind speed trends over southern Africa | |
Nchaba, Teboho1,2; Mpholo, Moeketsi2,3; Lennard, Chris1 | |
2017-05-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | South Africa; USA; Lesotho |
英文摘要 | A comprehensive analysis of near surface (10-m and 850 hPa) long-term (1980-2015) austral summer mean wind speed trends over southern Africa and the surrounding oceans (10 degrees-40 degrees S and 10 degrees W-50 degrees E) is carried out. The climate forecast system reanalysis and the climate forecast system reanalysis version 2, the modern era retrospective-analysis for research and applications version 2, and the ERA-Interim products are used for the analysis. Trends are estimated using the Theil-Sen slope estimator and their significance tested with the Mann-Kendall test. Attribution of the wind speed trends to large scale circulation systems is determined from: (1) trends in 850 hPa geopotential height, surface pressure, and surface skin temperatures, (2) changes in the annual frequency of archetypal synoptic states generated by self-organizing maps from geopotential height data, and (3) the correlations of the wind speeds to the southern annular mode (SAM) and El Nino Southern Oscillations (ENSO) indices. There is an overall decline in wind speeds evident in all the reanalyses. Wind speeds reduce by an average 0.7 and 1.3 ms(-1) at 10m and 850 hPa, respectively, over the study period. Deceleration in midlatitude westerly and Atlantic south easterly winds are associated with a poleward shift in the subtropical anticyclone, a positive trend in the annual frequency of summer circulation weather types, and the weakening of the subtropical continental heat low. The SAM and ENSO are also found to have a statistically significant linear association with the observed wind speed trends. |
英文关键词 | long-term wind trends reanalysis southern annular mode south Atlantic anticyclone intertropical convergence zone south easterly winds westerlies |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404849200004 |
WOS关键词 | SELF-ORGANIZING MAP ; UNITED-STATES ; CLIMATE VARIABILITY ; HADLEY CIRCULATION ; POLEWARD EXPANSION ; ATLANTIC-OCEAN ; INDIAN-OCEAN ; ANNULAR MODE ; EAST-AFRICA ; REANALYSIS |
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/37718 |
专题 | 气候变化 |
作者单位 | 1.Univ Cape Town, Climate Syst Anal Grp, Private Bag X3, ZA-7701 Cape Town, South Africa; 2.Univ Penn, Mat Res & Engn Ctr, Philadelphia, PA 19104 USA; 3.Natl Univ Lesotho, Dept Phys & Elect, Roma, Lesotho |
推荐引用方式 GB/T 7714 | Nchaba, Teboho,Mpholo, Moeketsi,Lennard, Chris. Long-term austral summer wind speed trends over southern Africa[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(6). |
APA | Nchaba, Teboho,Mpholo, Moeketsi,&Lennard, Chris.(2017).Long-term austral summer wind speed trends over southern Africa.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(6). |
MLA | Nchaba, Teboho,et al."Long-term austral summer wind speed trends over southern Africa".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.6(2017). |
条目包含的文件 | 条目无相关文件。 |
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