Phenomenon and dynamical analysis of the atmospheric von K&#225;rm&#225;n vortex streets on Chinese Haiyang-1 satellite image

JIANG Xingwei; YE Xiaomin; SONG Qingtao; DING Jing

doi:10.3969/j.issn.0253-4193.2013.03.011

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JIANG Xingwei, YE Xiaomin, SONG Qingtao, DING Jing. Phenomenon and dynamical analysis of the atmospheric von Kármán vortex streets on Chinese Haiyang-1 satellite image[J]. Haiyang Xuebao, 2013, 35(3): 96-103. doi: 10.3969/j.issn.0253-4193.2013.03.011

Citation:

JIANG Xingwei, YE Xiaomin, SONG Qingtao, DING Jing. Phenomenon and dynamical analysis of the atmospheric von Kármán vortex streets on Chinese Haiyang-1 satellite image[J]. Haiyang Xuebao, 2013, 35(3): 96-103. doi: 10.3969/j.issn.0253-4193.2013.03.011

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Phenomenon and dynamical analysis of the atmospheric von Kármán vortex streets on Chinese Haiyang-1 satellite image

doi: 10.3969/j.issn.0253-4193.2013.03.011

National Satellite Ocean Application Service, Beijing 100081, China

Received Date: 2012-07-09
Rev Recd Date: 2013-04-02

Abstract

Abstract

von Kármán vortex streets in the southeast ocean area off the Jeju Island were observed on 2 March 2011 by using the Chinese Ocean Color Temperature Scanner (COCTS) data onboard Chinese Haiyang-1(HY-1B) satellite. The dynamics of the von Kármán streets were further analyzed in conjunction with observations from Moderate Resolution Imaging Spectroradiometer (MODIS). The averaged ratios(h/a)of the spacing of two atmospheric vortex street rows to that of individual vortex from COCTS and MODIS images are 0.32 and 0.35, respectively. Low wind speed vortices near sea surface and warm SST tongue were also observed in the vortex streets area, as well as an inversion temperature layer in the vertical atmosphere. The displacement speed of the vortices, 12.2 m/s, was computed from two cloud images of COCTS and MODIS in adjacent time, and the values calculated using the geometrical size (h/a) and the dynamical model for the COCTS and MODIS images are 12.8 m/s and 12.3 m/s, respectively. The dynamical parameters of vortex streets were estimated including shedding rate of the atmospheric vortex 1.24×10^-4 s^-1, shedding period 134 min, Reynolds number 60 to 75, kinematic vortex viscosity 2 200 to 2 750, Froude number 0.10, and Rossby number 0.43. The analyzed results in this study indicate that the Chinese HY-1B satellite data are useful for quantitative studies on oceanic and atmospheric processes, such as von Kármán atmospheric vortex streets.
- Haiyang-1 satellite,
- COCTS,
- atmospheric von Ká,
- rmá

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References(18)

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