DOI: 10.1007/s00382-015-2606-1
Scopus记录号: 2-s2.0-84957428626
论文题名: Spatial and temporal variations in rainfall over Darwin and its vicinity during different large-scale environments
作者: Rauniyar S.P. ; Walsh K.J.E.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-03-04 起始页码: 671
结束页码: 691
语种: 英语
英文关键词: CPOL radar
; Darwin atmospheric regimes
; Diurnal cycle
; Land–sea thermal contrast
; MJO
; Regional variation
英文摘要: This study analyses the regional variations in rainfall over Darwin and its vicinity due to different large-scale circulations during the Australian summer by utilizing the combination of in situ and C-band polarimetric radar rainfall data at hourly resolution. The eight phases of the Madden–Julian oscillation as defined by Wheeler and Hendon (Mon Weather Rev 132(8):1917–1932, 2004) were used as indicators of different large-scale environments. The analysis found that the large-scale forcing starts to build up from phase 4 by the reversal of low- to mid-level easterly winds to moist westerly winds, reaching a maximum in phase 5 and weakening through phases 6–7. During phases 4–6, most of the study domain experiences widespread rainfall, but with distinct spatial and temporal structures. In addition, during these phases, coastal areas near Darwin receive more rainfall in the early morning (0200–0400 LT) due to the spreading or expansion of rainfall from the Beagle Gulf, explaining the occurrence of a secondary diurnal rainfall peak over Darwin. In contrast, local-scale mechanisms (sea breezes) reinvigorate from phase 8, further strengthening through phases 1–3, when low-level easterly winds become established over Darwin producing rainfall predominately over land and island locations during the afternoon. During these phases, below average rainfall is observed over most of the radar domain, except over the Tiwi Islands in phase 2. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53847
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth Sciences, The University of Melbourne, Victoria, Australia
Recommended Citation:
Rauniyar S.P.,Walsh K.J.E.. Spatial and temporal variations in rainfall over Darwin and its vicinity during different large-scale environments[J]. Climate Dynamics,2016-01-01,46(2017-03-04)