Aiki, Hidenori

Tsuboki, Kazuhisa

Yoshioka, Mayumi K.

吉岡, 真由美

坪木, 和久

相木, 秀則

Earth Simulator Research Results Repository

AAS02-04 会場:101A 時間:5月 25日 09:45-10:00
大気海洋結合・非結合実験における海洋に対する台風強度の違い
Sensitivity of typhoon intensity to the ocean in atmosphere-ocean coupled/non-coupled
experiments
吉岡真由美 1¤,相木秀則 2,坪木和久 1
YOSHIOKA, Mayumi K.1¤, AIKI, Hidenori2, TSUBOKI, Kazuhisa1
1 名古屋大学地球水循環研究センター, 2 独立行政法人海洋研究開発機構
1Hydrospheric Atmospheric Research Center, Nagoya University, 2Japan Agency for Marine-earth Science and Technology
Intensity of typhoons is greatly controlled by air-sea interaction with the ocean through the sea surface, with affecting the
sea temperature distribution through mixing/upwelling in the upper layer in the ocean. To investigate the intensity change of
typhoons with air-sea interaction, umerical experiments were performed utilizing with atmosphere-ocean regional coupled/non-
coupled model; slab ocean model was for one dimensional coupled experiments and CReSS-NHOES was for three dimensional
coupled experiments.
In the comparison of the results, remarkable differences of intensities resulting from air-sea interaction were represented, with
successfully simulating typical structures of typhoons. Especially, the deepening of the central minimum pressure of typhoons
was suppressed resulting in the ocean circulation caused by the typhoons. The magnitude of the central pressure deepening in the
mature stage was more in the three-dimensional ocean coupled experiment including upwelling, compared to that in a slab ocean
experiment of one-dimensional vertical mixing heat transfer in the ocean upper layer, and was much more compared to that in
fixed sea surface temperature experiment without time variation.
In the western North Pacific, passing typhoons are greatly affected the local sea surface temperature around the warm Kuroshio
currents where meridional sea temperature gradient is sharp. Sensitivity experiments employed meridionally smoothed sea sur-
face temperature were performed to investigate to consider the effect by the Kuroshio currents in addition to the coupled/non-
coupled experiments. The intensity of the typhoon was suppressed passing around the Kuroshio current and showed weak deep-
ening of the central minimum pressure in the experiment with smoothing sea surface temperature. The experiment employed
zonally averaged meridionally smoothed showed quite weak deepening of the central minimum pressure toward the mature
stage. These appeared in the typhoons, especially ones which moved slowly around the Kuroshio currents.
We will discuss intensity suppression of typhoons, not only the difference of the sea surface temperature but also the difference
of the latent/sensible heat flux around the center of the typhoons and the ocean heat content in the ocean surface layer.
キーワード:熱帯低気圧,台風,大気海洋相互作用,大気海洋結合モデル,雲解像メソスケール領域モデル,数値実験
Keywords: tropical cyclone, typhoon, air-sea interaction, atmosphere-ocean coupled model, cloud resolving mesoscale regional
model, Numerical experiment
1/1


大気海洋結合・非結合実験における海洋に対する台風強度の違い

Abstract

Similar works

Full text

Available Versions

Earth Simulator Research Results Repository