The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform
Shin'ichiro Kako - One of the best experts on this subject based on the ideXlab platform.
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Transient and local weakening of surface winds observed above the Kuroshio front in the winter East China Sea
Journal of Geophysical Research: Atmospheres, 2014Co-Authors: Kenki Kasamo, Atsuhiko Isobe, Shoshiro Minobe, Atsuyoshi Manda, Hirohiko Nakamura, Koto Ogata, Hatsumi Nishikawa, Yoshihiro Tachibana, Shin'ichiro KakoAbstract:To confirm whether surface winds strengthen above warm waters around oceanic fronts using in situ data, a field measurement was conducted using both expendable bathythermographs and Global Positioning System sondes released concurrently across the Kuroshio front in the East China Sea in December 2010. In contrast to previous studies mainly based on satellite observations, the finding of the present field survey is the local weakening of surface winds at the northern flank of the Kuroshio front. From the above field observation in conjunction with a regional numerical model experiment, it is suggested that the northwesterly winds crossing the Kuroshio front from the cooler side first weaken at the northern flank of the front because of the onset of upward transfer of the “Nonslip” Condition at the sea surface. Thereafter, as the atmospheric mixed layer with warm and humid air mass develops gradually downwind over the Kuroshio region, the surface winds are gradually accelerated by the momentum mixing with strong winds aloft. The surface winds remain strong over the cool East China Sea shelf, and it is thus considered that the surface winds only weaken at the northern flank of the Kuroshio front. However, numerical modeling indicates that this local weakening of the surface winds occurs as a transient state with a short duration and such a structure has thus rarely been detected in the long-term averaged wind fields observed by satellites.
Rong Liu - One of the best experts on this subject based on the ideXlab platform.
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Influence of high-frequency vibration on the Rayleigh–Marangoni instability in a two-layer system
Physics of Fluids, 2011Co-Authors: Qiu-sheng Liu, Rong LiuAbstract:The influences of high-frequency vibrations on the Rayleigh-Marangoni instability in a two-layer system are investigated theoretically in the framework of the averaging method. We focus on the effects of vertical and horizontal vibrations on the stability of different convection modes. The results show that vertical vibrations significantly stabilize the system, while horizontal vibrations significantly destabilize it. In the presence of vertical vibrations, instability only occurs in a system heated from below. However, in the presence of horizontal vibrations, instability can also occur in a system cooled from below. When Marangoni effect is dominant at the interface, it is found that there are four types of coupling modes. The oscillatory convection is the result of the competition between different modes. In the presence of Marangoni effect at the interface, the structure of the interfacial flow is complicated. In some cases, small counter-rolls may develop to preserve the Nonslip Condition of fluids in either the upper layer or the lower layer. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554765]
Kenki Kasamo - One of the best experts on this subject based on the ideXlab platform.
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Transient and local weakening of surface winds observed above the Kuroshio front in the winter East China Sea
Journal of Geophysical Research: Atmospheres, 2014Co-Authors: Kenki Kasamo, Atsuhiko Isobe, Shoshiro Minobe, Atsuyoshi Manda, Hirohiko Nakamura, Koto Ogata, Hatsumi Nishikawa, Yoshihiro Tachibana, Shin'ichiro KakoAbstract:To confirm whether surface winds strengthen above warm waters around oceanic fronts using in situ data, a field measurement was conducted using both expendable bathythermographs and Global Positioning System sondes released concurrently across the Kuroshio front in the East China Sea in December 2010. In contrast to previous studies mainly based on satellite observations, the finding of the present field survey is the local weakening of surface winds at the northern flank of the Kuroshio front. From the above field observation in conjunction with a regional numerical model experiment, it is suggested that the northwesterly winds crossing the Kuroshio front from the cooler side first weaken at the northern flank of the front because of the onset of upward transfer of the “Nonslip” Condition at the sea surface. Thereafter, as the atmospheric mixed layer with warm and humid air mass develops gradually downwind over the Kuroshio region, the surface winds are gradually accelerated by the momentum mixing with strong winds aloft. The surface winds remain strong over the cool East China Sea shelf, and it is thus considered that the surface winds only weaken at the northern flank of the Kuroshio front. However, numerical modeling indicates that this local weakening of the surface winds occurs as a transient state with a short duration and such a structure has thus rarely been detected in the long-term averaged wind fields observed by satellites.
Qiu-sheng Liu - One of the best experts on this subject based on the ideXlab platform.
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Influence of high-frequency vibration on the Rayleigh–Marangoni instability in a two-layer system
Physics of Fluids, 2011Co-Authors: Qiu-sheng Liu, Rong LiuAbstract:The influences of high-frequency vibrations on the Rayleigh-Marangoni instability in a two-layer system are investigated theoretically in the framework of the averaging method. We focus on the effects of vertical and horizontal vibrations on the stability of different convection modes. The results show that vertical vibrations significantly stabilize the system, while horizontal vibrations significantly destabilize it. In the presence of vertical vibrations, instability only occurs in a system heated from below. However, in the presence of horizontal vibrations, instability can also occur in a system cooled from below. When Marangoni effect is dominant at the interface, it is found that there are four types of coupling modes. The oscillatory convection is the result of the competition between different modes. In the presence of Marangoni effect at the interface, the structure of the interfacial flow is complicated. In some cases, small counter-rolls may develop to preserve the Nonslip Condition of fluids in either the upper layer or the lower layer. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554765]
Atsuhiko Isobe - One of the best experts on this subject based on the ideXlab platform.
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Transient and local weakening of surface winds observed above the Kuroshio front in the winter East China Sea
Journal of Geophysical Research: Atmospheres, 2014Co-Authors: Kenki Kasamo, Atsuhiko Isobe, Shoshiro Minobe, Atsuyoshi Manda, Hirohiko Nakamura, Koto Ogata, Hatsumi Nishikawa, Yoshihiro Tachibana, Shin'ichiro KakoAbstract:To confirm whether surface winds strengthen above warm waters around oceanic fronts using in situ data, a field measurement was conducted using both expendable bathythermographs and Global Positioning System sondes released concurrently across the Kuroshio front in the East China Sea in December 2010. In contrast to previous studies mainly based on satellite observations, the finding of the present field survey is the local weakening of surface winds at the northern flank of the Kuroshio front. From the above field observation in conjunction with a regional numerical model experiment, it is suggested that the northwesterly winds crossing the Kuroshio front from the cooler side first weaken at the northern flank of the front because of the onset of upward transfer of the “Nonslip” Condition at the sea surface. Thereafter, as the atmospheric mixed layer with warm and humid air mass develops gradually downwind over the Kuroshio region, the surface winds are gradually accelerated by the momentum mixing with strong winds aloft. The surface winds remain strong over the cool East China Sea shelf, and it is thus considered that the surface winds only weaken at the northern flank of the Kuroshio front. However, numerical modeling indicates that this local weakening of the surface winds occurs as a transient state with a short duration and such a structure has thus rarely been detected in the long-term averaged wind fields observed by satellites.
