| DOI: | 10.1175/JCLI-D-13-00422.1
|
| Scopus记录号: | 2-s2.0-84909594896
|
| 论文题名: | Variability of the Australian Monsoon and precipitation trends at Darwin |
| 作者: | Evans S.; Marchand R.; Ackerman T.
|
| 刊名: | Journal of Climate
|
| ISSN: | 8948755
|
| 出版年: | 2014
|
| 卷: | 27, 期:22 | | 起始页码: | 8487
|
| 结束页码: | 8500
|
| 语种: | 英语
|
| Scopus关键词: | Classification (of information)
; Climate change
; Climatology
; Precipitation (chemical)
; Rain
; Australia
; Interannual variability
; Intraseasonal variability
; Madden-Julian oscillation
; Monsoon season
; Monsoons
; Precipitation trends
; Trends
; Atmospheric thermodynamics
; annual variation
; classification
; El Nino-Southern Oscillation
; Madden-Julian oscillation
; monsoon
; precipitation (climatology)
; seasonal variation
; trend analysis
; Australia
; Darwin
; Northern Territory
|
| 英文摘要: | An atmospheric classification for northwestern Australia is used to define periods of monsoon activity and investigate the interannual and intraseasonal variability of the Australian monsoon, as well as long-term precipitation trends at Darwin. The classification creates a time series of atmospheric states, which two correspond to the active monsoon and the monsoon break. Occurrence of these states is used to define onset, retreat, seasonal intensity, and individual active periods within seasons. The authors demonstrate the quality of their method by showing it consistently identifies extended periods of precipitation as part of the monsoon season and recreates well-known relationships between Australian monsoon onset, intensity, and ENSO. The authors also find that onset and seasonal intensity are significantly correlated with ENSO as early as July. Previous studies have investigated the role of the Madden-Julian oscillation (MJO) during the monsoon by studying the frequency and duration of active periods, but these studies disagree on whether the MJO creates a characteristic period or duration. The authors use their metrics of monsoon activity and the Wheeler- Hendon MJO index to examine the timing of active periods relative to the phase of the MJO. It is shown that active periods preferentially begin duringMJOphases 3 and 4, as the convective anomaly approaches Darwin, and end during phases 7 and 8, as the anomaly departs Darwin. Finally, the causes of the multidecadal positive precipitation trend at Darwin over the last few decades are investigated. It is found that an increase in the number of days classified as active, rather than changes in the daily rainfall rate during active monsoon periods, is responsible. © 2014 American Meteorological Society. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/51254
|
| Appears in Collections: | 气候变化事实与影响
|
|
There are no files associated with this item.
|
|
作者单位: | Department of Atmospheric Sciences, Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States
|
| Recommended Citation: | |
Evans S.,Marchand R.,Ackerman T.. Variability of the Australian Monsoon and precipitation trends at Darwin[J]. Journal of Climate,2014-01-01,27(22)
|
|
|