Preprints
https://doi.org/10.5194/amt-2021-83
https://doi.org/10.5194/amt-2021-83

  14 Apr 2021

14 Apr 2021

Review status: this preprint is currently under review for the journal AMT.

Retrievals of dust-related particle mass and ice-nucleating particle concentration profiles with ground-based polarization lidar and sun photometer over a central China megacity

Yun He1,2,3, Yunfei Zhang1,2,3, Fuchao Liu1,2,3, Zhenping Yin1,2,3, Yang Yi1,2,3, Yifan Zhan1,2,3, and Fan Yi1,2,3 Yun He et al.
  • 1School of Electronic Information, Wuhan University, Wuhan 430072, China
  • 2Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430072, China
  • 3State Observatory for Atmospheric Remote Sensing, Wuhan 430072, China

Abstract. The POLIPHON (Polarization Lidar Photometer Networking) method is a powerful pathway to retrieve the height profiles of dust-related particle mass and ice-nucleating particles (INP) concentrations. The conversion factors fitted from the sun photometer observation data are the major part of the POLIPHON computations, which can convert the polarization-lidar-derived dust extinction coefficients into the dust-related particle mass and INP concentrations. For a central China megacity Wuhan (30.5° N, 114.4° E), located at the downstream area several thousands of kilometers far away from the source regions of Asian dust, dust particles always mix with other aerosols from local emission. Therefore, very few dust case data sets can be available when using the column-integrated Ångström exponent (for 440–870 nm) < 0.3 and aerosol optical depth (at 532 nm) > 0.1 recorded by sun photometer as the filtering criteria. Instead, we present another dust-case data-set screening scheme that applies the simultaneous polarization lidar observation to verify the occurrence of dust. Based on the 33 dust-intrusion days identified during 2011–2013, the extinction-to-volume (cv,d) and extinction-to-large particle (with radius > 250 nm) number concentration (c250,d) conversion factors are determined to be 0.52 × 10−12 Mm m3 m−3 and 0.11 Mm cm−3, respectively. They are both smaller than those observed at Lanzhou SACOL (36.0° N, 104.1° E), a site closer to the Gobi Desert, due to the partial dust sedimentation during transport. The conversion factors are applied in a dust event in Wuhan to reveal the typical dust-related INP concentration over East Asia city. The proposed dust-case data-set screening scheme may potentially be extended to the other polluted city sites more influenced by mixed dust.

Yun He et al.

Status: open (until 09 Jun 2021)

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  • RC1: 'Comment on amt-2021-83', Anonymous Referee #1, 12 May 2021 reply

Yun He et al.

Data sets

MUA PLidar and Sun Photometer Dataset for Dust-related Ice Nucleation Particle Concentration Profile Yun He https://doi.org/10.5281/zenodo.4683015

Yun He et al.

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Short summary
POLIPHON method can retrieve the height profiles of dust-related particle mass and ice-nucleating particles (INP) concentrations. Applying a dust-case data-set screening scheme based on the lidar-derived depolarization ratio (rather than Ångström exponent for 440–870 nm and AOD at 532 nm), the mixed-dust-related conversion factors are retrieved from the sun photometer observation over a central China megacity, Wuhan. This method may potentially be extended to the regions influenced by mixed dust.