Variation characteristics of nocturnal low-level jet in summer over the hinterland of Taklimakan Desert

doi:10.7522/j.issn.1000-694X.2020.00056

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (5): 89-100.DOI: 10.7522/j.issn.1000-694X.2020.00056

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Variation characteristics of nocturnal low-level jet in summer over the hinterland of Taklimakan Desert

Jiantao Zhang¹(), Minzhong Wang¹(), Qing He², Honglin Pan¹, Lu Meng¹, Yanhui Wang³

^1.Taklimakan Desert Meteorology Field Experiment Station of CMA，Institute of Desert Meteorology，China Meteorological Administration，Urumqi 830002，China
^2.Xinjiang Meteorological Bureau，Urumqi 830002，China
^3.Meteorological Disaster Prevention Technology Center of Xinjiang Uygur Autonomous Region，Urumqi 830002，China

Received:2020-03-27 Revised:2020-05-24 Online:2020-09-28 Published:2020-09-28
Contact: Minzhong Wang

Abstract

Abstract:

In this paper， based on the data of GPS sounding observation in July of 2016 and 2017 in the hinterland of the Taklimakan Desert， the variation characteristics and causes of nocturnal low-level jet （NLLJ） in summer are analyzed. The results show that the occurrence probability of NLLJ is high in the Taklimakan Desert hinterland in summer. The probability of weak NLLJ is about 71.0%， the average jet velocity is 13.2 m·s^-1， the average jet height is 424 m， the main wind direction of the jet is easterly， the jet velocity is mainly distributed in the range of 9-14 m·s^-1， the jet height is mainly distributed in the low level of 200-500 m， and the strong NLLJ is distributed in the higher altitude. In addition， the formation and development of NLLJ on a clear day presents a clear diurnal variation. It starts to develop after sunset， reaches its maximum at midnight， then gradually weakens， and dissipates before and after sunrise. The jet wind direction gradually deflects from northeast wind to east wind or southeast wind with the passage of time. Furthermore， sandstorm can promote the development of NLLJ， and the speed of jet can be further increased on the basis of sandstorm， forming a strong NLLJ. The forcing of weather system has a great influence on the intensity of NLLJ in the hinterland of the Taklimakan Desert， but the time is short. The inertial concussion and terrain factors attach a weak influence on the intensity of jets， but they can affect the formation and development of NLLJ for a long time.

Key words: nocturnal low-level jet, Taklimakan Desert, inertial concussion, diurnal variation

CLC Number:

P425

Jiantao Zhang, Minzhong Wang, Qing He, Honglin Pan, Lu Meng, Yanhui Wang. Variation characteristics of nocturnal low-level jet in summer over the hinterland of Taklimakan Desert[J]. Journal of Desert Research, 2020, 40(5): 89-100.

Figures/Tables 13

References 25

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型号	厂家	传感器	测量范围	探测精度	误差范围
CF-06-A GNSS	北京长峰微电科技有限公司	温度/℃	-90～+60	0.1	±0.2
		湿度/%	0～100	1	±3
		气压/hPa	3～1 080	0.1	±1.0
		风速/(m·s^-1)	0～150	0.1	±0.15
		风向/(°)	0～360	0.1	±2

型号	厂家	传感器	测量范围	探测精度	误差范围
CF-06-A GNSS	北京长峰微电科技有限公司	温度/℃	-90～+60	0.1	±0.2
		湿度/%	0～100	1	±3
		气压/hPa	3～1 080	0.1	±1.0
		风速/(m·s^-1)	0～150	0.1	±0.15
		风向/(°)	0～360	0.1	±2

型号	厂家	主要指标	参数
CFL-GNSS-JS	北京长峰微电科技有限公司	接收频率范围/MHz	400~406
		AFC控制精度/kHz	2
		天线增益/dB	>7
		噪声系数/dB	2.7

型号	厂家	主要指标	参数
CFL-GNSS-JS	北京长峰微电科技有限公司	接收频率范围/MHz	400~406
		AFC控制精度/kHz	2
		天线增益/dB	>7
		噪声系数/dB	2.7

低空急流	V_max/（m·s^-1）	ΔV/（m·s^-1）	2016年		2017年
低空急流	V_max/（m·s^-1）	ΔV/（m·s^-1）	02:00	08:00	02:00	08:00
LLJ1	≥8	≥4	20	17	17	17
LLJ2	≥10	≥5	19	13	12	12
LLJ3	≥12	≥6	13	8	6	7
LLJ4	≥16	≥8	4	/	2	1

Variation characteristics of nocturnal low-level jet in summer over the hinterland of Taklimakan Desert

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Figures/Tables 13

References 25

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年份	日期	夜间	白天	LLJ类型
2016	7月2日	扬沙	浮尘	LL3
	7月3日	晴	沙尘暴	LL3
	7月4日	扬沙	浮尘	LL3
	7月6日	沙尘暴	沙尘暴	LL4
	7月7日	沙尘暴	晴	LL2
	7月8日	浮尘	扬沙	LL2
	7月9日	扬沙	晴	LL3
	7月15日	晴	沙尘暴	LL2
	7月16日	沙尘暴	沙尘暴	LL4
	7月19日	沙尘暴	浮尘	LL4
	7月23日	扬沙	扬沙	LL3
	7月31日	沙尘暴	扬沙	LL4
2017	7月4日	沙尘暴	晴	LL4
	7月12日	沙尘暴	扬沙	LL4
	7月15日	晴	扬沙	LL2
	7月16日	扬沙	扬沙	LL3
	7月21日	扬沙	晴	LL2
	7月24日	扬沙	沙尘暴	LL3
	7月25日	沙尘暴	扬沙	LL4
	7月26日	扬沙	降水	LL1
	7月30日	沙尘暴	扬沙	LL3
	7月31日	扬沙	晴	LL1

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