Comparative analysis of two dust weather processes in Tarim Basin， China

doi:10.7522/j.issn.1000-694X.2022.00160

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (4): 76-88.DOI: 10.7522/j.issn.1000-694X.2022.00160

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Comparative analysis of two dust weather processes in Tarim Basin， China

Kader Mavlan¹^,²(), Lu Zhang³, Xinhua Liu²(), Tunyaz Nurbiye⁴, Muming Gulnafar⁵, Shaobo Gao⁶

^1.Xinjiang Airport Group Co. ，Ltd，Urumqi 830000，China
^2.National Meteorological Center，Beijing 100081，China
^3.Inner Mongolia Meteorological Observatory，Hohhot 010051，China
^4.Kashi Meteorological Observatory，Kashi 844000，Xinjiang，China
^5.Lop Meteorological Administration，Lop 848200，Xinjiang，China
^6.Grassland Research Institute，Chinese Academy of Agricultural Sciences，Hohhot 010010，China

Received:2022-09-09 Revised:2022-12-01 Online:2023-07-20 Published:2023-08-14
Contact: Xinhua Liu

Abstract

Abstract:

Using the conventional observation data， NCEP reanalysis data and CALIPSO satellite data， HYSPLIT model， potential source contribution factor analysis method and concentration weight trajectory analysis method， two typical dust weather processes in summer of 2015 and spring of 2022 in Tarim Basin under similar circulation situation were compared and analyzed. Taking Hotan as an example， the differences of weather system configuration， related physical quantity characteristics， dust transport path and potential source areas in the two processes were analyzed. The results show that the two weather processes were both affected by the upper trough， but the location of the upper trough in summer of 2015 was more southward than that in spring of 2022 and had obvious meridional characteristics. The collapse of the blocking high system caused the rapid outbreak of cold air and the strong vertical movement of the atmosphere， so the intensity of dust weather in summer of 2015 in the basin was stronger than that in spring of 2022. In spring of 2022， in addition to the dust weather caused by a little cold air over the bottom of the trough， the low-level easterly jet was stronger than in summer of 2015， which caused the sandstorm in the east of the basin and transported from west to east. The dust in summer of 2015 was mainly transported by west path， and the main source was the west of Taklimakan Desert， and some dust was transported from south of Kyrgyzstan. The dust particles in spring of 2022 were mainly driven by easterly airflow， and Taklimakan Desert was the main source of dust. During spring of 2022， the convergence of the westerly and easterly wind fields near Hotan made the dust particles converge. In addition， the stable circulation situation and relatively warm and humid atmospheric conditions made the dust difficult to diffuse. Therefore， the duration of low visibility in spring of 2022 was relatively longer. The special geographical location made the dust process from west to east or from east to west in the basin accumulated in Hotan area.

Key words: dust weather, diagnostic analysis, transmission path, potential source analysis

CLC Number:

P429

Kader Mavlan, Lu Zhang, Xinhua Liu, Tunyaz Nurbiye, Muming Gulnafar, Shaobo Gao. Comparative analysis of two dust weather processes in Tarim Basin， China[J]. Journal of Desert Research, 2023, 43(4): 76-88.

Figures/Tables 11

Fig.1 Dust weather distribution in dust weather process of 2015 （A） and 2022 （B）

Fig. 2 500 hPa height field （black isoline， unit： gpm）， temperature field （red isoline， unit： °C） and 850 hPa wind field at 08:00 （A）， 20:00 （B） on 9 June， 2015 and at 08:00 （C）， 20:00 （D） on 24 March， 2022

Fig.3 Sea level pressure field （isoline， unit： hPa）， frontal function （shadow， unit ： 10-5 K·m-1·s-1）， surface gale（≥17 m·s-1） at 08:00 （A）， 20:00 （B） on 9 June， 2015 and at 08:00 （C）， 20:00 （D） on 24 March， 2022

Fig.4 Vertical velocity （isoline， unit： Pa·s-1）， divergence （shadow， unit ： 10-5 s-1） and vertical wind profile along 37.13°N at 20:00 （A） on 9 June， 2015 and at 20:00 （B） on 24 March， 2022

Fig.5 Temperature advection （shadow， unit ： ℃·s-1）， pseudo-equivalent potential temperature （red isoline， unit ： K）and vertical wind profile along 79.93°E at 08:00 （A）， 20:00 （B） on 9 June， 2015 and at 08:00 （C）， 20:00 （D） on 24 March， 2022

Fig.6 850 hPa divergence （isoline， 10-5 s-1）， horizontal helicity （shadow， m2·s-2） at 08:00 on 9 June （A）， 02:00 on 10 June （B）， 2015 and at 08:00 on 24 March （C）， 02:00 on 25 March （D）， 2022

Fig.7 48 h backward trajectory clustering analysis of dust process on June 9， 2015 （A） and March 25， 2022 （B）

Fig.8 Distribution of WPSCF in dust process on June 9， 2015 （A） and March 25， 2022 （B）

Fig.9 Distribution of CWTin dust process on June 9， 2015 （A） and March25， 2022 （B）

Fig.10 CALIPSO satellite trajectory （black lines） and aerosol vertical characteristics information at 15:53 on 9 June （A，C） and at 04:18 on 10 June （B，D）， 2015

Fig.11 CALIPSO satellite trajectory （ black lines ） and aerosol vertical characteristics information at 05:06 on 25 March （A，C） and at 05:43 on 26 March （B，D）， 2022

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Comparative analysis of two dust weather processes in Tarim Basin， China

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