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Impact of an unprecedented marine heatwave on extremely hot summer over Northern Japan in 2023.
Sato, Hirotaka; Takemura, Kazuto; Ito, Akira; Umeda, Takafumi; Maeda, Shuhei; Tanimoto, Youichi; Nonaka, Masami; Nakamura, Hisashi.
Afiliación
  • Sato H; Japan Meteorological Agency, 3-6-9 Toranomon, Minato City, Tokyo, 105-8431, Japan. h_sato@met.kishou.go.jp.
  • Takemura K; Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan. h_sato@met.kishou.go.jp.
  • Ito A; Japan Meteorological Agency, 3-6-9 Toranomon, Minato City, Tokyo, 105-8431, Japan.
  • Umeda T; Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan.
  • Maeda S; Japan Meteorological Agency, 3-6-9 Toranomon, Minato City, Tokyo, 105-8431, Japan.
  • Tanimoto Y; Japan Meteorological Agency, 3-6-9 Toranomon, Minato City, Tokyo, 105-8431, Japan.
  • Nonaka M; Japan Meteorological Agency, 3-6-9 Toranomon, Minato City, Tokyo, 105-8431, Japan.
  • Nakamura H; Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan.
Sci Rep ; 14(1): 16100, 2024 Jul 19.
Article en En | MEDLINE | ID: mdl-39030191
ABSTRACT
Possible local influence of an extreme marine heatwave is investigated on unprecedentedly hot summer around northern Japan in 2023. Sea-surface temperatures (SSTs) and subsurface ocean temperatures around northern Japan were also unprecedentedly high in the summer. This was especially the case off the east coast of Japan, where cool Oyashio water was replaced with much warmer water due to a striking poleward meander of the Kuroshio Extension persistent from the spring. Particularly amplified near-surface air temperature anomalies and even stronger warm anomalies in the subsurface ocean suggest that the marine heatwave acted to sustain the atmospheric heatwave. Anomalous upward of latent and sensible heat fluxes from the warmed sea surface are indicative of local oceanic impact. The warm SST anomalies reduced the lower-tropospheric stratification to maintain unfavourable condition for low-level cloud formation, which in turn led to increased surface insolation for further SST warming as positive feedback. The increased moisture in the warmed lower troposphere contributed to the enhanced surface downward longwave radiation. This enhanced greenhouse effect acted not only as positive feedback on the warm SST anomalies that increased evaporation but also as a contributor for the extreme warmth over northern Japan landmass.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido