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Hails in Ny Alesund, Svalbard-atmospheric vertical structure and dependence on circulation

Author

Listed:
  • M. Nuncio

    (National Centre for Polar and Ocean Research, Ministry of Earth Sciences)

  • R. Athulya

    (National Centre for Polar and Ocean Research, Ministry of Earth Sciences)

  • Naveen Nandanan

    (Cochin University of Science and Technology
    Blue power partners)

  • Sourav Chatterjee

    (National Centre for Polar and Ocean Research, Ministry of Earth Sciences)

  • K. Satheesan

    (Cochin University of Science and Technology)

  • Asutosh Acharya

    (National Centre for Polar and Ocean Research, Ministry of Earth Sciences
    Indian Institute of technology)

  • M. P. Subeesh

    (National Centre for Polar and Ocean Research, Ministry of Earth Sciences
    University of Bremen
    Institute of Environmental Physics)

  • P. J. Vidya

    (National Centre for Polar and Ocean Research, Ministry of Earth Sciences)

Abstract

Hails observed at Ny Alesund, Svalbard in the Arctic during December–February 2018–19 is examined along with the atmospheric circulation patterns. When hail was noticed, surface warming and southwesterly—westerly winds were noticed. Atmospheric circulation pattern was characterised by high pressure anomaly over northwestern Europe. High clouds as well as excess liquid water were present when the high pressure systems were active over northwestern Europe. This is because winds blowing over ocean collect more moisture as well as transport nucleating particles to Svalbard. Also, hourly winds from ERA 5 reanalysis indicated vertical shear required for hail formation. When hails were observed, mixed precipitation types were recorded with the maximum intensities arising from the hails. The West Spitzbergen Current (WSC) induces a strong east west sea surface temperature (SST) gradient in the ocean west of Svalbard. A corresponding gradient in the atmospheric temperature is also maintained by the WSC in the west to east direction in the lower atmosphere. Moisture laden westerlies cross the SST gradient and induce strong frontal activity in the lower atmosphere resulting intense precipitation and hail. The upward vertical velocity noted in the lower troposphere supports the frontal activity. Human activities in the Arctic as elsewhere are bound to increase. Hence, there is a need to study the intense precipitation in the Arctic as well as its reasons as it can impact the Arctic environment and human activity. This calls for more continuous observations to clearly identify mechanisms and frequency of intense precipitation in the Arctic.

Suggested Citation

  • M. Nuncio & R. Athulya & Naveen Nandanan & Sourav Chatterjee & K. Satheesan & Asutosh Acharya & M. P. Subeesh & P. J. Vidya, 2023. "Hails in Ny Alesund, Svalbard-atmospheric vertical structure and dependence on circulation," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 117(2), pages 1365-1380, June.
    • Handle: RePEc:spr:nathaz:v:117:y:2023:i:2:d:10.1007_s11069-023-05907-0
    DOI: 10.1007/s11069-023-05907-0
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    References listed on IDEAS

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    1. Julian C. Brimelow & William R. Burrows & John M. Hanesiak, 2017. "The changing hail threat over North America in response to anthropogenic climate change," Nature Climate Change, Nature, vol. 7(7), pages 516-522, July.
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