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A global survey of diurnal offshore propagation of rainfall

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  • Junying Fang

    (Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
    Sun Yat-sen University
    Ministry of Education)

  • Yu Du

    (Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
    Sun Yat-sen University
    Ministry of Education)

Abstract

Diurnal rainfall offshore propagation (OP) shapes the timing and intensity of coastal rainfall and thus impacts both nature and society. Previous OP studies have rarely compared various coasts, and a consensus regarding physical mechanisms has not been reached on a global scale. Here, we provide the global climatology of observed OP, which propagates across ~78% of all coasts and accounts for ~59% of the coastal precipitation. Generally, OP is facilitated by low latitudes, high moisture conditions and offshore background winds. OP at low latitudes in a high-moisture environment is mainly caused by inertia–gravity waves due to the land–sea thermal contrast, whereas OP at higher latitudes is significantly influenced by background winds under trapped land–sea breeze circulation conditions. Slower near-shore OP might be modulated by density currents. Our results provide a guide for global OP hotspots and suggest relative contributions of mechanisms from a statistical perspective.

Suggested Citation

  • Junying Fang & Yu Du, 2022. "A global survey of diurnal offshore propagation of rainfall," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34842-0
    DOI: 10.1038/s41467-022-34842-0
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    References listed on IDEAS

    as
    1. Jun Yin & Amilcare Porporato, 2017. "Diurnal cloud cycle biases in climate models," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    2. Christopher M. Taylor & Richard A. M. de Jeu & Françoise Guichard & Phil P. Harris & Wouter A. Dorigo, 2012. "Afternoon rain more likely over drier soils," Nature, Nature, vol. 489(7416), pages 423-426, September.
    3. Elizabeth J. Kendon & Nigel M. Roberts & Hayley J. Fowler & Malcolm J. Roberts & Steven C. Chan & Catherine A. Senior, 2014. "Heavier summer downpours with climate change revealed by weather forecast resolution model," Nature Climate Change, Nature, vol. 4(7), pages 570-576, July.
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