著者

MIYAMOTO Yoshiaki NISHIZAWA Seiya TOMITA Hirofumi

出版者

Meteorological Society of Japan

雑誌

気象集誌. 第2輯 (ISSN:00261165)

巻号頁・発行日

pp.2020-023, (Released:2020-02-06)

被引用文献数

2

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The impacts of the number density of cloud condensation nuclei (CCN) and other thermodynamic quantities on moist Rayleigh convection were examined. A numerical model, consisting of a simple two–dimensional equation for Boussinesq air and a sophisticated double moment microphysics scheme, was developed. The impact of the number of CCN is most prominent in the initially formed convection, whereas the convection in the quasi–steady state does not significantly depend on the number of CCN. It is suggested that the former convection is driven by a mechanism without a background circulation, such as parcel theory. In contrast, the latter convection appears to be driven by the statically unstable background layer.  Incorporating the cloud microphysics reduces the integrated kinetic energy and number of convective cell (increases the distance between the cells), with some exceptions, which are consistent with previous studies. These features are not largely sensitive to the number of CCN. It is shown in this study that the reduction in kinetic energy is mainly due to condensation (evaporation) in the upper (lower) layer, which tends to stabilize the fluid. The ensemble simulation shows that the sensitivity of the moist processes to changes the temperature at the bottom boundary, temperature lapse rate, water vapor mixing ratio, and CCN is qualitatively similar to that in the control simulation. The impact becomes strong with increasing temperature lapse rate. The number of convective cell in a domain decreases with the degree of supersaturation or an increase in the domain–integrated condensate.

著者

Nishizawa Seiya Odaka Masatsugu Takahashi Yoshiyuki O. Sugiyama Ko-ichiro Nakajima Kensuke Ishiwatari Masaki Takehiro Shin-ichi Yashiro Hisashi Sato Yousuke Tomita Hirofumi Hayashi Yoshi-Yuki

出版者

American Geophysical Union

雑誌

Geophysical Research Letters (ISSN:00948276)

巻号頁・発行日

vol.43, no.9, pp.4180-4188, 2016-05-16

被引用文献数

19

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火星ダストデビルの性質を解明-火星天気予報や火星有人探査への一歩-. 京都大学プレスリリース. 2016-07-27.