Preprints
https://doi.org/10.5194/acp-2022-53
https://doi.org/10.5194/acp-2022-53
 
14 Feb 2022
14 Feb 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Dust transport and advection measurement with spaceborne lidars ALADIN, CALIOP and model reanalysis data

Guangyao Dai1, Kangwen Sun1, Xiaoye Wang1, Songhua Wu1,2,3, Xiangying E1, Qi Liu1, and Bingyi Liu1,2 Guangyao Dai et al.
  • 1Department of Marine Technology, College of Information Science and Engineering, Ocean University of China, Qingdao, 266100, China
  • 2Laboratory for Regional Oceanography and Numerical Modelling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266200, China
  • 3Institute for Advanced Ocean Study, Ocean University of China, Qingdao, 266100, China

Abstract. In this paper, a long-term large-scale Sahara dust transport event occurred during 14 June and 27 June 2020 is tracked with the spaceborne lidars ALADIN and CALIOP observations and the models ECMWF and HYSPLIT analysis. We evaluate the performance of the ALADIN and CALIOP on the observations of dust optical properties and wind fields and explore the capability in tracking the dust events and in calculating the dust mass advection with the combination of measurement data from ALADIN and CALIOP coupled with the products from ECMWF and HYSPLIT. The dust plumes are identified with AIRS/Aqua “Dust Score Index” and with the “Vertical Feature Mask” products from CALIOP. The emission, dispersion, transport and deposition of the dust event are monitored using the data from AIRS/Aqua, CALIOP and HYSPLIT. With the quasi-synchronization observations by ALADIN and CALIOP, combining the wind field and relative humidity, the dust advection values are calculated. From this study, it is found that the dust event generated on 14 and 15 June 2020 from Sahara Desert in North Africa, and then dispersed and transported westward over the Atlantic Ocean, and finally deposited in the Atlantic Ocean, the Americas and the Caribbean Sea. During the transport and deposition processes, the dust plumes are trapped in the Northeasterly Trade-wind zone between the latitudes of 5 °N and 30 °N , altitudes of 0 km and 6 km (in this paper we name this space area as “Saharan dust westward transport tunnel”). From the measurement results on 19 June 2020, influenced by the hygroscopic effect and mixing with other types aerosols, the backscatter coefficients of dust plumes are increasing along the transport routes, with 3.88 × 10−6 ± 2.59 × 10−6 m−1sr−1 in “dust portion during emission phase”, 7.09 × 10−6 ± 3.34 × 10−6 m−1sr−1 in “dust portion during development phase” and 7.76 × 10−6 ± 3.74 × 10−6 m−1sr−1 in “dust portion during deposition phase”. Finally, the advection value at different dust parts and heights on 19 June and on entire transport routine during transportation are computed. On 19 June, the mean dust advection values are about 2.06 mg · m−2 ·s−1 in dust portion during emission phase, 1.47 mg · m−2 ·s−1 in dust portion during development phase and 0.95 mg · m−2 ·s−1 in dust portion during deposition phase. In the whole life-time of the dust event, the mean dust advection values are about 1.50 mg · m−2 ·s−1 on 15 June 2020, 2.41 mg · m−2 ·s−1 on 16 June 2020, 1.47 mg · m−2 ·s−1 on 19 June 2020, 2.01 mg · m−2 ·s−1 on 24 June 2020 and 1.15 mg · m−2 ·s−1 on 27 June 2020. During the dust development stage, the mean advection values gradually increase and reach to the maximum value on 16 June with the enhancement of the dust event. Then, the mean advection values decrease during the transport and the deposition of the dust over the Atlantic Ocean, the Americas and the Caribbean Sea.

Guangyao Dai et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-53', Anonymous Referee #1, 09 Mar 2022
    • AC1: 'Reply on RC1', Kangwen Sun, 11 May 2022
  • RC2: 'Comment on acp-2022-53', Anonymous Referee #2, 19 Apr 2022
    • AC2: 'Reply on RC2', Kangwen Sun, 11 May 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-53', Anonymous Referee #1, 09 Mar 2022
    • AC1: 'Reply on RC1', Kangwen Sun, 11 May 2022
  • RC2: 'Comment on acp-2022-53', Anonymous Referee #2, 19 Apr 2022
    • AC2: 'Reply on RC2', Kangwen Sun, 11 May 2022

Guangyao Dai et al.

Guangyao Dai et al.

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Short summary
In this paper, a Sahara dust event is tracked with the spaceborne lidars ALADIN and CALIOP and the models ECMWF and HYSPLIT. The performance of ALADIN and CALIOP on tracking the dust event and on the observations of dust optical properties and wind fields during the dust transport is evaluated. The dust mass advection is defined, which is calculated with the combination of the data from ALADIN and CALIOP coupled with the products from models, to describe the dust transport quantitatively.
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