Numerical Experiments Examining the Mechanism of Diurnal Variation of Tropical Convection

スポンサーリンク

概要

• 論文の詳細を見る

• A regional atmospheric model was used to clarify the mechanisms that drive the diurnal cycle of tropical convection over the western Pacific Ocean. The diurnal cycle of convection was simulated using data from the Tropical Ocean Global Atmosphere Coupled Ocean-Atmosphere Response Experiment (TOGA-COARE). Mechanisms suggested by previous investigators were confirmed through comparison experiments. The diurnal variation in precipitation was simulated without the effect of horizontal differences in radiative cooling between cloudy and clear regions. Horizontal differences of radiative cooling are not the main factor driving diurnal variation. Direct radiative cooling, and cloud radiative cooling effects destabilize the atmosphere during the night. Numerical experiments that reduced cloud radiative cooling demonstrated the importance of the cloud radiative cooling effect rather than the direct radiative cooling effect. Moreover, in the standard experiment, strong cloud radiative cooling appeared at both upper levels and at the top of the boundary layer. The experiment demonstrated that both the upper level cloud radiative cooling, and the boundary layer cloud radiative cooling, are important in driving the diurnal variation of convection. Boundary-layer cloud radiative cooling destabilizes the low layer atmosphere and promotes the development of shallow convection to deep convection. Diurnal variation of water vapor also plays a role in driving diurnal variation of convection. Moisture is transported upward from the boundary layer at night when radiative cooling of the boundary-layer cloud is intensified.

• 社団法人日本気象学会の論文
• 2004-10-25

著者

• Kubota Hisayuki

  Institute of Observational Research for Global Change (IORGC)

• Numaguti Atusi

  Institute Of Observational Research For Global Change Japan Agency For Marine-earth Science And Tech

• Kubota Hisayuki

  Institute Of Observational Research For Global Change Japan Agency For Marine-earth Science And Tech

• Kubota H

  Japan Agency For Marine‐earth Sci. And Technol. Yokosuka Jpn

• EMORI Seita

  National Institute for Environmental Studies

• Emori Seita

  National Institute For Environmental Studies:frontier Research Center For Global Change Japan Agency

• Kubota Atusi

  Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology

• 大楽 浩司

  Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology

• 江守 正多

  Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology

• 沖 大幹

  National Institute for Environmental Studies

関連論文

• C166 Diagnosis of the Marine Atmospheric Boundary Layer and Microphysical Parameters over Palau in the Tropical Western Pacific Ocean
• The Impact of Cumulus Suppression on the Baiu Front Simulated by an AGCM
• P169 Application of Wind profilers : Diurnal and seasonal variation of precipitating cloud systems over Asia and Western Tropical Pacific Ocean
• Observations of the Structures of Deep Convections and Their Environment during the Active Phase of an Madden-Julian Oscillation Event over the Equatorial Western Pacific
• Global Analysis of LAI Sensitivity to Precipitation and Surface Air Temperature Variations
• Diurnal Variations of Tropical Convection Observed during the TOGA-COARE
• Numerical Experiments Examining the Mechanism of Diurnal Variation of Tropical Convection
• Numerical Study on the Baiu Front Genesis by Heating Contrast between Land and Ocean
• Importance of Cumulus Parameterization for Precipitation Simulation over East Asia in June

スポンサーリンク