Spatial and temporal variations in rainfall over Darwin and its vicinity during different large-scale environments

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• 作者：Surendra P. Rauniyar ; Kevin J. E. Walsh
• 关键词：Regional variation ; Diurnal cycle ; MJO ; Darwin atmospheric regimes ; Land–sea thermal contrast ; CPOL radar
• 刊名：Climate Dynamics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：46
• 期：3-4
• 页码：671-691
• 全文大小：7,319 KB
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• 作者单位：Surendra P. Rauniyar (1)
  Kevin J. E. Walsh (1)
  
  1. School of Earth Sciences, The University of Melbourne, Victoria, 3010, Australia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Meteorology and Climatology
  Oceanography
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0894

文摘

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. Keywords Regional variation Diurnal cycle MJO Darwin atmospheric regimes Land–sea thermal contrast CPOL radar