Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0405.1 |
From Synoptic to Interdecadal Variability in Southern African Rainfall: Toward a Unified View across Time Scales | |
Pohl, Benjamin1; Dieppois, Bastien2,3,4; Cretat, Julien1,5,6; Lawler, Damian2; Rouault, Mathieu3,7 | |
2018-08-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:15页码:5845-5872 |
文章类型 | Article |
语种 | 英语 |
国家 | France; England; South Africa |
英文摘要 | During the austral summer season (November-February), southern African rainfall, south of 20 degrees S, has been shown to vary over a range of time scales, from synoptic variability (3-7 days, mostly tropical temperate troughs) to interannual variability (2-8 years, reflecting the regional effects of El Nino-Southern Oscillation). There is also evidence for variability at quasi-decadal (8-13 years) and interdecadal (15-28 years) time scales, linked to the interdecadal Pacific oscillation and the Pacific decadal oscillation, respectively. This study aims to provide an overview of these ranges of variability and their influence on regional climate and large-scale atmospheric convection and quantify uncertainties associated with each time scale. We do this by applying k-means clustering onto long-term (1901-2011) daily outgoing longwave radiation anomalies derived from the 56 individual members of the Twentieth Century Reanalysis. Eight large-scale convective regimes are identified. Results show that 1) the seasonal occurrence of the regimes significantly varies at the low-frequency time scales mentioned above; 2) these modulations account for a significant fraction of seasonal rainfall variability over the region; 3) significant associations are found between some of the regimes and the aforementioned modes of climate variability; and 4) associated uncertainties in the regime occurrence and convection anomalies strongly decrease with time, especially the phasing of transient variability. The short-lived synoptic anomalies and the low-frequency anomalies are shown to be approximately additive, but even if they combine their respective influence at both scales, the magnitude of short-lived perturbations remains much larger. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438848800005 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; SOUTHWEST INDIAN-OCEAN ; MADDEN-JULIAN-OSCILLATION ; MESOSCALE CONVECTIVE COMPLEXES ; REGIONAL CLIMATE MODEL ; SST DIPOLE EVENTS ; SUMMER RAINFALL ; DECADAL VARIABILITY ; TROPICAL ATLANTIC ; EL-NINO |
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/20248 |
专题 | 气候变化 |
作者单位 | 1.Univ Bourgogne Franche Comte, CNRS, UMR Biogeosci 6282, Ctr Rech Climatol, Dijon, France; 2.Coventry Univ, Ctr Agroecol Water & Resilience, Coventry, W Midlands, England; 3.Univ Cape Town, Dept Oceanog, Cape Town, South Africa; 4.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England; 5.Univ Paris 06, Sorbonne Univ, UPMC, CNRS,IRD,MNHN,LOCEAN Lab,IPSL, Paris, France; 6.Univ Paris Saclay, UVSQ, CNRS, LSCE,IPSL,CEA, Gif Sur Yvette, France; 7.Univ Cape Town, Nansen Tutu Ctr Marine Environm Res, Cape Town, South Africa |
推荐引用方式 GB/T 7714 | Pohl, Benjamin,Dieppois, Bastien,Cretat, Julien,et al. From Synoptic to Interdecadal Variability in Southern African Rainfall: Toward a Unified View across Time Scales[J]. JOURNAL OF CLIMATE,2018,31(15):5845-5872. |
APA | Pohl, Benjamin,Dieppois, Bastien,Cretat, Julien,Lawler, Damian,&Rouault, Mathieu.(2018).From Synoptic to Interdecadal Variability in Southern African Rainfall: Toward a Unified View across Time Scales.JOURNAL OF CLIMATE,31(15),5845-5872. |
MLA | Pohl, Benjamin,et al."From Synoptic to Interdecadal Variability in Southern African Rainfall: Toward a Unified View across Time Scales".JOURNAL OF CLIMATE 31.15(2018):5845-5872. |
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