Artigo Revisado por pares

Climatological study on mesoscale extreme high temperature events in the inland of the Tokyo Metropolitan Area, Japan, during the past 22 years

2014; Wiley; Volume: 34; Issue: 15 Linguagem: Inglês

10.1002/joc.3951

ISSN

1097-0088

Autores

Yuya Takane, Hiroyuki Kusaka, Hiroaki Kondo,

Tópico(s)

Urban Heat Island Mitigation

Resumo

Over the past 22 years (1990–2011), the inland part of the Tokyo metropolitan area has had 75 days with an extreme high temperature (EHT) higher than 37.2 °C in Kumagaya, Saitama Prefecture. To determine the synoptic-scale and mesoscale conditions for such EHT events, a statistical analysis was conducted using observational and objective analysis data. The results show that all the EHT events satisfy the conditions of a daily minimum surface air temperature above 21.4 °C on Kumagaya and an air temperature at 850 hPa above 18.8 °C on Tsukuba. The EHT days satisfying these conditions were categorized into 27 types according to different combinations of synoptic-pressure patterns, surface wind patterns, and the number of consecutive preceding clear-sky days. The most frequent type occurred eight times (10.7% of days) and was the 'WHALE' (tail of a whale) pressure pattern with a southeast (SE) surface wind, with at least four (4+) consecutive preceding clear-sky days. However, the type with the highest average maximum surface air temperature had a different wind direction, which was WHALE with a northwest (NW) surface wind and 4+ consecutive preceding clear-sky days. This type appeared only twice but produced the average maximum temperature of 39.7 °C.

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