Characteristics of Orographic Rain Drop-Size Distribution at Cherrapunji, Northeast India

DOI Web Site 被引用文献2件 参考文献68件 オープンアクセス
  • Fumie Murata
    Faculty of Science and Technology, Kochi University, Kochi 780-8520, Japan
  • Toru Terao
    Faculty of Education, Kagawa University, Takamatsu 760-0016, Japan
  • Kaustav Chakravarty
    Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune 411 008, India
  • Hiambok Jones Syiemlieh
    Department of Geography, North-Eastern Hill University, Shillong 793 002, India
  • Laitpharlang Cajee
    Department of Geography, North-Eastern Hill University, Shillong 793 002, India

説明

<jats:p>The rain drop size distribution (DSD) at Cherrapunji, Northeast India was observed by a laser optical disdrometer Parsivel 2 from May to October 2017; this town is known for the world’s heaviest orographic rainfall recorded. The disdrometer showed a 30% underestimation of the rainfall amount, compared with a collocated rain gauge. The observed DSD had a number of drops with a mean normalized intercept log 10 N w > 4.0 for all rain rate categories, ranging from <5 to >80 mm h − 1 , comparable to tropical oceanic DSDs. These results differ from those of tropical oceanic DSDs, in that data with a larger N w were confined to the stratiform side of a stratiform/convective separation line proposed by Bringi et al. (2009). A large number of small drops is important for quantitative precipitation estimates by in-situ radar and satellites, because it tends to miss or underestimate precipitation amounts. The large number of small drops, as defined by the second principal component (>+1.5) while using the principal component analysis approach of Dolan et al. (2018), was rare for the pre-monsoon season, but was prevalent during the monsoon season, accounting for 16% (19%) of the accumulated rainfall (precipitation period); it tended to appear over weak active spells or the beginning of active spells of intraseasonal variation during the monsoon season.</jats:p>

収録刊行物

  • Atmosphere

    Atmosphere 11 (8), 777-, 2020-07-23

    MDPI AG

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