A Statistical Study of Gravity Wave with Second-level Radiosonde Data in Sichuan

Wu Hongkun; Chen Qiying; Hua Wei; Li Fangfang; Li Zechun

doi:10.11898/1001-7313.20190409

Vol.30, NO.4, 2019

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Article Navigation > Journal of Applied Meteorological Science > 2019 > 30(4): 491-501

Wu Hongkun, Chen Qiying, Hua Wei, et al. A statistical study of gravity wave with second-level radiosonde data in Sichuan. J Appl Meteor Sci, 2019, 30(4): 491-501. DOI: 10.11898/1001-7313.20190409.

Citation:

Wu Hongkun, Chen Qiying, Hua Wei, et al. A statistical study of gravity wave with second-level radiosonde data in Sichuan. J Appl Meteor Sci, 2019, 30(4): 491-501. DOI: 10.11898/1001-7313.20190409.

Wu Hongkun, Chen Qiying, Hua Wei, et al. A statistical study of gravity wave with second-level radiosonde data in Sichuan. J Appl Meteor Sci, 2019, 30(4): 491-501. DOI: 10.11898/1001-7313.20190409.

Citation:

Wu Hongkun, Chen Qiying, Hua Wei, et al. A statistical study of gravity wave with second-level radiosonde data in Sichuan. J Appl Meteor Sci, 2019, 30(4): 491-501. DOI: 10.11898/1001-7313.20190409.

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A Statistical Study of Gravity Wave with Second-level Radiosonde Data in Sichuan

DOI: 10.11898/1001-7313.20190409

1.
Chengdu University of Information Technology, Chengdu 610225
2.
National Meteorological Center, Beijing 100081

Received Date: 2018-11-20
Rev Recd Date: 2019-03-08
Publish Date: 2019-07-31

Abstract

Abstract

High vertical resolution radiosonde data of Sichuan Province from June 2014 to September 2017 are analyzed to derive important gravity wave parameters, such as wave energy, intrinsic frequencies, vertical and horizontal wavelengths, and propagation directions. The sampling period of these data is 1.2 s and the vertical resolution is 5-8 m. Five representative stations of Sichuan Province are investigated, including Ganzi, Hongyuan, Chengdu, Xichang and Dazhou. Data in troposphere (2-10 km) and stratosphere (18-25 km), and the latest upper-air wind measurement algorithm for L-band radiosonde sounding system are used to process the original data. Results show that there are obvious seasonal variabilities of gravity waves energy at various areas in Sichuan, strong in winter and weak in summer. In the troposphere, due to the influence of terrain, the energy in the western Sichuan and northern Sichuan regions is significantly smaller than that in other regions. And gravity wave activity is also affected by latitudes. There is no obvious spatial variation in vertical wavelength, and vertical wavelength in winter is slightly larger than summer. The vertical wavelength is concentrated at 1.5-3 km and 1.5-3.5 km in the troposphere and stratosphere, respectively. The horizontal wavelength is quite different, distributed in 0-300 km and 100-700 km, or averaged of 100 km and 350 km in the troposphere and stratosphere, respectively. The ratio of horizontal wavelength to vertical wavelength is 35:1 in the troposphere and 150:1 in the stratosphere. It indicates that gravity waves mainly propagate vertically in the troposphere and propagate horizontally in the stratosphere. In order to get more accurate intrinsic frequency of gravity waves, filtering is essential perform before calculation. There is a large regional difference for intrinsic frequency in the troposphere. The averaged intrinsic frequency in the Plateau regions in northwestern Sichuan is 3 (represents the Coriolis force parameter), while only 2.4 in other regions. There is no obvious spatial difference in the stratosphere, and the mean value is about 2. The vertical propagation directions of gravity waves at different stations in Sichuan are similar, with about 50% of the waves propagating upward in the troposphere and more than 90% in the stratosphere. Horizontal propagation direction of gravity wave is always influenced by background wind field, and it has significant uncertainty, especially in the troposphere. The horizontal propagation of gravity waves in stratosphere strongly depends on season, eastward in summer and westward in other seasons.
- gravity waves;
- second-level radiosonde data;
- temporal and spatial characteristics

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References(32)

Figures and Tables

Fig. 1 Map of radiosonde stations

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Fig. 2 Original profiles of Chengdu Station at 0000 UTC 1 Jan 2015 (a)temperature, (b)zonal wind, (c)meridional wind

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Fig. 3 Gravity wave energy density in troposphere from Jun 2014 to Sep 2017 (a)potential energy, (b)kinetic energy, (c)total energy, (d)ratio of kinetic energy and potential energy

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Fig. 4 The same as in Fig. 3, but for the stratosphere

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Fig. 5 Monthly vertical wavelength in Sichuan Province from Jun 2014 to Sep 2017 (a)troposphere, (b)stratosphere

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Fig. 6 Frequency distributions of the vertical wavelength at Dazhou Station from Jun 2014 to Sep 2017 (a)troposphere, (b)stratosphere

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Fig. 7 Frequency distributions of the ratio of major axis to minor axis of polarization ellipse at Chengdu Station from Jun 2014 to Sep 2017 (a)troposphere before filtering, (b)troposphere after filtering, (c)stratosphere before filtering, (d)stratosphere after filtering

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Fig. 8 Frequency distributions of gravity wave horizontal wavelength at Chengdu Station from Jun 2014 to Sep 2017 (a)troposphere, (b)stratosphere

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Fig. 9 Frequency distributions of gravity wave horizontal propagating directions at Chengdu Station

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Table 1 The ratio of major axis to minor axis of polarization ellipse for other stations in Sichuan Province

站点	对流层滤波前	对流层滤波后	平流层滤波前	平流层滤波后
甘孜站	1.75	2.91	1.46	2.11
红原站	1.73	3.03	1.43	2.07
达州站	1.73	2.44	1.46	2.04
西昌站	1.74	2.43	1.47	2.12

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Table 2 The average gravity wave horizontal wavelength for other stations in Sichuan Province

站点	对流层/km	平流层/km
甘孜站	99.4	320.0
红原站	96.3	343.7
西昌站	117.1	329.9
达州站	117.1	361.4

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Table 3 The percentage of upward propagating gravity wave for each station in Sichuan Province

站点	对流层/%	平流层/%
甘孜站	56.5	93.3
红原站	66.7	98.1
成都站	48.4	94.9
西昌站	55.7	91.9
达州站	44.9	93.9

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