Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.4810 |
Low-frequency variability and trends in centennial precipitation stations in southern South America | |
Saurral, Ramiro I.1,2; Camilloni, Ines A.1,2; Barros, Vicente R.1,2 | |
2017-03-30 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
![]() |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Argentina |
英文摘要 | Southern South America (SSA), considered as the continental region south of 20 degrees S, has experienced significant precipitation variability and trends in the last decades. This article uses monthly quality-controlled precipitation data from rainfall stations with continuous observations during at least 100years to quantify long-term trends as well as interannual-to-centennial variability. Several statistical methods are applied to the data, primarily to detect jumps and look for changes due to relocation of the gauge stations, as well as to identify significant trends. Most of the regions have registered an increase in annual rainfall, largely attributable to changes in the warm season. On the other hand, during winter most stations in Argentina and Brazil do not have significant trends, although eastern Patagonia registered an increase in precipitation and Chile, a marked decrease in rainfall. In order to look into the physical mechanisms behind the observed variability, the changes in mean sea level pressure and precipitable water are quantified for different sub-periods. Also explored is the variability related to the Hadley cell width and strength over the region around SSA. Results show that the Hadley cell has shrunk and shifted towards the equator in winter over the area, which has caused an enhancement of the sinking motion over much of Argentina, Chile and Brazil, while likely increasing the baroclinicity (and associated precipitation) over Patagonia. In summer, the strength of the subsidence decreased and this was associated with an increase of the low-level moisture advection, favouring more rainfall. The observational evidence presented here suggests that the zonal asymmetry in the change of the Hadley cell position over SSA could be linked to the presence of the Andes Cordillera. |
英文关键词 | southern South America precipitation trends and variability Hadley cell |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000397497700009 |
WOS关键词 | ARGENTINA SUMMER PRECIPITATION ; SURFACE TEMPERATURE ANOMALIES ; LA-PLATA BASIN ; OBSERVATIONAL EVIDENCE ; ANNULAR MODE ; HADLEY-CELL ; CLIMATE ; CIRCULATION ; RAINFALL ; WIDTH |
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/37361 |
专题 | 气候变化 |
作者单位 | 1.UMI IFAECI CNRS, Ctr Invest Mar & Atmosfera, UBA CONICET, Buenos Aires, DF, Argentina; 2.UBA, Dept Ciencias Atmosfera & Oceanos, FCEN, Buenos Aires, DF, Argentina |
推荐引用方式 GB/T 7714 | Saurral, Ramiro I.,Camilloni, Ines A.,Barros, Vicente R.. Low-frequency variability and trends in centennial precipitation stations in southern South America[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(4). |
APA | Saurral, Ramiro I.,Camilloni, Ines A.,&Barros, Vicente R..(2017).Low-frequency variability and trends in centennial precipitation stations in southern South America.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(4). |
MLA | Saurral, Ramiro I.,et al."Low-frequency variability and trends in centennial precipitation stations in southern South America".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.4(2017). |
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