| Diurnal Variation of Tropical Convection during TOGA COARE IOP |
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| 引用本文： | Jae-Young BYON,Gyu-Ho LIM. Diurnal Variation of Tropical Convection during TOGA COARE IOP[J]. 大气科学进展, 2005, 22(5): 685-702. DOI: 10.1007/BF02918712 |
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| 作者姓名： | Jae-Young BYON Gyu-Ho LIM |
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| 作者单位： | School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea |
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| 摘 要： | Diurnal variation of tropical convection and kinematic and thermodynamic conditions was investigated for different large-scale environments of the convectively active and inactive periods by using satellite observations and surface measurements during the Intensive Observation Period （IOP） of the Tropical Ocean Global Atmosphere/Coupled Ocean-Atmosphere Response Experiment （TOGA/COARE）. During the convectively active period, the features of nocturnal convection appear in vertical profiles of convergence, vertical velocity, heat source, and moisture sink. The specific humidity increases remarkably in the middle troposphere at dawn. On the other hand, the altitude of maximum convergence and that of the upward motion is lower during the convectively inactive period. The specific humidity peaks in the lower troposphere in the daytime and decreases in the middle troposphere. Spectral analyses of the time series of the infrared （IR） brightness temperature （TBB） and amounts of rainfall suggest multiscale temporal variation with a prominent diurnal cycle over land and oceanic regions such as the Intensive Flux Array （IFA） and the South Pacific Convergence Zone （SPCZ）. Over land, the daily maximum of deep convection associated with cloud top temperature less than 208 K appears at midnight due to the daytime radiative heating and the sea-land breeze. Over the ocean, convection usually tends to occur at dawn for the convectively active period while in the afternoon during the inactive period. Comparing the diurnal variation of convection with large-scale variables, the authors inferred that moisture in the middle troposphere contributes mostly to the development of nocturnal convection over the ocean during the convectively active period.
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| 关 键 词： | 热带天气 对流天气 日变化 降雨量 |
| 收稿时间： | 2004-10-18 |
| 修稿时间： | 2005-06-13 |
Diurnal variation of tropical convection during TOGA COARE IOP |
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| Jae-Young Byon,Gyu-Ho Lim. Diurnal variation of tropical convection during TOGA COARE IOP[J]. Advances in Atmospheric Sciences, 2005, 22(5): 685-702. DOI: 10.1007/BF02918712 |
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| Authors: | Jae-Young Byon Gyu-Ho Lim |
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| Affiliation: | School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea,School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea |
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| Abstract: | Diurnal variation of tropical convection and kinematic and thermodynamic conditions was investigated for different large-scale environments of the convectively active and inactive periods by using satellite observations and surface measurements during the Intensive Observation Period (IOP) of the Tropical Ocean Global Atmosphere/Coupled Ocean-Atmosphere Response Experiment (TOGA/COARE). During the convectively active period, the features of nocturnal convection appear in vertical profiles of convergence, vertical velocity, heat source, and moisture sink. The specific humidity increases remarkably in the middle troposphere at dawn. On the other hand, the altitude of maximum convergence and that of the upward motion is lower during the convectively inactive period. The specific humidity peaks in the lower troposphere in the daytime and decreases in the middle troposphere. Spectral analyses of the time series of the infrared (IR) brightness temperature (TBB) and amounts of rainfall suggest multiscale temporal variation with a prominent diurnal cycle over land and oceanic regions such as the Intensive Flux Array (IFA) and the South Pacific Convergence Zone (SPCZ). Over land, the daily maximum of deep convection associated with cloud top temperature less than 208 K appears at midnight due to the daytime radiative heating and the sea-land breeze. Over the ocean, convection usually tends to occur at dawn for the convectively active period while in the afternoon during the inactive period. Comparing the diurnal variation of convection with large-scale variables, the authors inferred that moisture in the middle troposphere contributes mostly to the development of nocturnal convection over the ocean during the convectively active period. |
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| Keywords: | diurnal variation tropical convection rainfall large-scale environment |
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