Modulation of Extratropical Cyclones by Previous Cyclones via the Sea Surface Temperature Anomaly Over the Sea of Japan in Winter

Ning Zhao, Shinsuke Iwasaki, Masaru Yamamoto, Atsuhiko Isobe

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

The effects of a cyclone-induced sea surface temperature (SST) anomaly in the Sea of Japan on following cyclones were investigated using a regional numerical model. The model was conducted with and without an SST anomaly due to cooling from a single extratropical cyclone in winter. Twenty-six pairs of sensitivity experiments demonstrated that cyclones were not always sensitive to the SST anomaly. The low-level trough (strong northwesterly winds) affected cyclone sensitivity via a cold air intrusion over the Sea of Japan. A strong (weak) cold air intrusion formed a relatively unstable (stable) and higher (lower) convective layer and the concentration of cyclone paths over the oceans, making the cyclones sensitive to the underlying SST. Two specific cyclones were analyzed to demonstrate two distinct patterns (wave-like and path shifting, respectively) in cyclone modulations revealed in the wavelet spectra. The wave-like pattern was formed by the superposition of multiple anomalous waves with different periods and scales, which originated from upper-level potential vorticity anomalies and temperature advection. The path-shifting pattern was caused by the diabatic heating-induced potential vorticity anomalies, which were supplied by the intense heat and moisture from the regions surrounding the Sea of Japan. Therefore, a cyclone can modulate a following cyclone by reducing the SST over the Sea of Japan; however, the modulation can vary in different ways, depending on the atmospheric background and dynamics of the cyclone development.

本文言語英語
ページ(範囲)6312-6330
ページ数19
ジャーナルJournal of Geophysical Research: Atmospheres
123
12
DOI
出版ステータス出版済み - 6 27 2018

All Science Journal Classification (ASJC) codes

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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