Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD029634 |
The South American Low-Level Jet: A New Climatology, Variability, and Changes | |
Montini, Tessa L.1; Jones, Charles1,2; Carvalho, Leila M. V.1,2 | |
2019-02-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:3页码:1200-1218 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The South American low-level jet (SALLJ) east of the Andes plays an important role in regional weather and hydrology by transporting large amounts of moisture from the Amazon to the subtropics. A new methodology is introduced for detecting SALLJ events based on seasonal-percentile thresholds of wind speed and wind shear. Direct comparisons are made between new and conventional fixed-threshold methods. Identification of SALLJ events is compared between five different reanalysis products and validated against available radiosonde observations. A new climatology of the SALLJ is presented for one particular reanalysis during a 38-year period (1979-2016). Based on this new definition, the present study analyzes the spatiotemporal variability of the SALLJ on seasonal and interannual timescales, as well as trends in the jet over recent decades. Results show that the interannual variability of the jet's strength and frequency is significantly modulated by the El Nino Southern Oscillation, especially during spring. Trends in the vertically integrated moisture transport during SALLJ days reveal significant increases in the northwesterly moisture flux associated with the jet toward southern Brazil in spring, summer, and fall. These changes likely contribute to the increase in precipitation and extreme precipitation events observed over southeastern South America in recent decades. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000459377000002 |
WOS关键词 | SUMMER RAINFALL ; INTERANNUAL VARIABILITY ; EL-NINO ; ANDES ; PRECIPITATION ; EAST ; MONSOON ; EVENTS ; TRENDS ; ENSO |
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/33913 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA; 2.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA |
推荐引用方式 GB/T 7714 | Montini, Tessa L.,Jones, Charles,Carvalho, Leila M. V.. The South American Low-Level Jet: A New Climatology, Variability, and Changes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(3):1200-1218. |
APA | Montini, Tessa L.,Jones, Charles,&Carvalho, Leila M. V..(2019).The South American Low-Level Jet: A New Climatology, Variability, and Changes.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(3),1200-1218. |
MLA | Montini, Tessa L.,et al."The South American Low-Level Jet: A New Climatology, Variability, and Changes".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.3(2019):1200-1218. |
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