The Experts below are selected from a list of 6810 Experts worldwide ranked by ideXlab platform
Margaret A Lemone - One of the best experts on this subject based on the ideXlab platform.
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vertical velocity in Oceanic Convection off tropical australia
Journal of the Atmospheric Sciences, 1994Co-Authors: Christopher Lucas, Edward J. Zipser, Margaret A LemoneAbstract:Abstract Time series of 1-Hz vertical velocity data collected during aircraft penetrations of Oceanic cumulonimbus clouds over the western Pacific warm pool as part of the Equatorial Mesoscale Experiment (EMEX) are analyzed for updraft and downdraft events called cores. An updraft core is defined as occurring whenever the vertical velocity exceeds 1 m s−1 for at least 500 m. A downdraft core is defined analogously. Over 19 000 km of straight and level flight legs are used in the analysis. Five hundred eleven updraft cores and 253 downdraft cores are included in the dataset. Core properties are summarized as distributions of average and maximum vertical velocity, diameter, and mass flux in four altitude intervals between 0.2 and 5.8 km. Distributions are approximately lognormal at all levels. Examination of the variation of the statistics with height suggests a maximum in vertical velocity between 2 and 3 km; slightly lower or equal vertical velocity is indicated at 5 km. Near the freezing level, virtual t...
Christopher Lucas - One of the best experts on this subject based on the ideXlab platform.
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vertical velocity in Oceanic Convection off tropical australia
Journal of the Atmospheric Sciences, 1994Co-Authors: Christopher Lucas, Edward J. Zipser, Margaret A LemoneAbstract:Abstract Time series of 1-Hz vertical velocity data collected during aircraft penetrations of Oceanic cumulonimbus clouds over the western Pacific warm pool as part of the Equatorial Mesoscale Experiment (EMEX) are analyzed for updraft and downdraft events called cores. An updraft core is defined as occurring whenever the vertical velocity exceeds 1 m s−1 for at least 500 m. A downdraft core is defined analogously. Over 19 000 km of straight and level flight legs are used in the analysis. Five hundred eleven updraft cores and 253 downdraft cores are included in the dataset. Core properties are summarized as distributions of average and maximum vertical velocity, diameter, and mass flux in four altitude intervals between 0.2 and 5.8 km. Distributions are approximately lognormal at all levels. Examination of the variation of the statistics with height suggests a maximum in vertical velocity between 2 and 3 km; slightly lower or equal vertical velocity is indicated at 5 km. Near the freezing level, virtual t...
Ricardo C Anderson - One of the best experts on this subject based on the ideXlab platform.
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convective vertical velocity and cloud internal vertical structure an a train perspective
Geophysical Research Letters, 2014Co-Authors: Jeyavinoth Jeyaratnam, Suginori Iwasaki, Hanii Takahashi, Ricardo C AndersonAbstract:This paper describes a novel use of A-Train observations to estimate vertical velocities for actively growing convective plumes and to relate them to cloud internal vertical structure. Convective vertical velocity is derived from time-delayed (1–2 min) IR measurements from MODIS and IIR. Convective vertical velocities are found to be clustered around 2–4 m/s but the distributions are positively skewed with long tails extending to larger values. Land Convection during the 13:30 overpasses has higher vertical velocities than those during the 1:30 overpasses; Oceanic Convection shows the opposite, albeit smaller, contrast. Our results also show that Convection with larger vertical velocity tends to transport larger precipitation-size particle and/or greater amount of water substance to higher altitude and produces heavier rainfall. Finally, we discuss the implications of this study for the designs of future space-borne missions that focus on fast-evolving processes such as those related to clouds and precipitation.
Hanii Takahashi - One of the best experts on this subject based on the ideXlab platform.
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convective vertical velocity and cloud internal vertical structure an a train perspective
Geophysical Research Letters, 2014Co-Authors: Jeyavinoth Jeyaratnam, Suginori Iwasaki, Hanii Takahashi, Ricardo C AndersonAbstract:This paper describes a novel use of A-Train observations to estimate vertical velocities for actively growing convective plumes and to relate them to cloud internal vertical structure. Convective vertical velocity is derived from time-delayed (1–2 min) IR measurements from MODIS and IIR. Convective vertical velocities are found to be clustered around 2–4 m/s but the distributions are positively skewed with long tails extending to larger values. Land Convection during the 13:30 overpasses has higher vertical velocities than those during the 1:30 overpasses; Oceanic Convection shows the opposite, albeit smaller, contrast. Our results also show that Convection with larger vertical velocity tends to transport larger precipitation-size particle and/or greater amount of water substance to higher altitude and produces heavier rainfall. Finally, we discuss the implications of this study for the designs of future space-borne missions that focus on fast-evolving processes such as those related to clouds and precipitation.
Edward J. Zipser - One of the best experts on this subject based on the ideXlab platform.
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vertical velocity in Oceanic Convection off tropical australia
Journal of the Atmospheric Sciences, 1994Co-Authors: Christopher Lucas, Edward J. Zipser, Margaret A LemoneAbstract:Abstract Time series of 1-Hz vertical velocity data collected during aircraft penetrations of Oceanic cumulonimbus clouds over the western Pacific warm pool as part of the Equatorial Mesoscale Experiment (EMEX) are analyzed for updraft and downdraft events called cores. An updraft core is defined as occurring whenever the vertical velocity exceeds 1 m s−1 for at least 500 m. A downdraft core is defined analogously. Over 19 000 km of straight and level flight legs are used in the analysis. Five hundred eleven updraft cores and 253 downdraft cores are included in the dataset. Core properties are summarized as distributions of average and maximum vertical velocity, diameter, and mass flux in four altitude intervals between 0.2 and 5.8 km. Distributions are approximately lognormal at all levels. Examination of the variation of the statistics with height suggests a maximum in vertical velocity between 2 and 3 km; slightly lower or equal vertical velocity is indicated at 5 km. Near the freezing level, virtual t...