Effect of Foehn Wind on Record-Breaking High Temperature Event (41.1°C) at Kumagaya on 23 July 2018 Effect of Foehn Wind on Record-Breaking High Temperature Event (41.1°C) at Kumagaya on 23 July 2018

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Author(s)

    • Nishi Akifumi
    • Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
    • Kusaka Hiroyuki
    • Center for Computational Sciences, University of Tsukuba, Tsukuba, Japan

Abstract

<p>In this study, we use observational data and numerical models to reveal whether foehn wind affects the record-breaking high-temperature event (41.1°C) at Kumagaya on July 23, 2018. On this day, the weather conditions at Kumagaya satisfied the conditions described in Takane et al. (2014) for a likely extreme high temperature (EHT) day: a "whale-tail" pressure pattern, no precipitation for 6 days, a high potential temperature at 850 hPa, and northerly surface winds. Our back-trajectory analysis shows that the air parcels came to Kumagaya from heights up to 3.0 km above sea level over the Sea of Japan. The Lagrangian energy budget analysis shows that adiabatic heating accounts for about 87.5% of the increase of the thermal energy given to the air parcel, with the rest from diabatic heating. The diabatic heating is caused by heating associated with surface sensible heat flux and the mixing by turbulent diffusion. The adiabatic and diabatic heating are calculated to have raised the temperature of air parcel by 14 and 2.0 K, respectively, for this EHT event. We conclude that the dynamic foehn effect and diabatic heating from the surface, together with mixing in the atmospheric boundary layer, affected the formation of this EHT event.</p>

Journal

  • SOLA

    SOLA 15(0), 17-21, 2019

    Meteorological Society of Japan

Codes

  • NII Article ID (NAID)
    130007579971
  • NII NACSIS-CAT ID (NCID)
    AA12022899
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    1349-6476
  • Data Source
    IR  J-STAGE 
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