Preprints
https://doi.org/10.5194/acp-2022-332
https://doi.org/10.5194/acp-2022-332
 
03 Jun 2022
03 Jun 2022
Status: this preprint is currently under review for the journal ACP.

Technical note: Identification of two ice-nucleating regimes for dust-related cirrus clouds based on the relationship between number concentrations of ice-nucleating particles and ice crystals

Yun He1,2,3, Zhenping Yin4, Fuchao Liu1,2,3, 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
  • 4School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430072, China

Abstract. Large amounts of dust aerosols are lifted to the upper troposphere every year and play a major role in cirrus formation by acting as efficient ice nuclei. However, the relative importance of heterogeneous nucleation and spontaneous homogenous nucleation in dust-related cirrus clouds is still not well evaluated globally. Here, based on space-borne observations, we propose a method to identify two ice-nucleating regimes of dust-related cirrus clouds, i.e., (1) sole presence of heterogeneous nucleation and (2) competition between heterogeneous and homogeneous nucleation, by characterizing the relationship between dust ice-nucleating particle concentrations (INPC) calculated from the Cloud-Aerosol LIdar with Orthogonal Polarization (CALIOP) using the POlarization LIdar PHOtometer Networking (POLIPHON) method and in-cloud ice crystal number concentration (ICNC) from the DARDAR (liDAR/raDAR) dataset. Two typical cirrus cases over central China are shown as a demonstration. In the first case, the upper part (near the cloud top) of a series of cirrus clouds successfully realized the INPC-ICNC closure, meaning that heterogeneous nucleation solely takes place; while the lower part of cirrus clouds showed the possible competition between heterogeneous and homogeneous nucleation. In the second case, the ICNCs in cirrus cloud dramatically exceeded the dust INPCs in the vicinity for more than an order of magnitude, revealing that besides dust-induced heterogeneous nucleation, homogeneous nucleation also participated in ice formation and produced the additional ice crystals. The proposed identification method is anticipated to apply in evaluating the influence of upper-troposphere dust on global cirrus formation and investigating the potential positive role of cirrus cloud thinning in the offset of climate warming.

Yun He et al.

Status: open (until 20 Jul 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-332', Anonymous Referee #1, 15 Jun 2022 reply

Yun He et al.

Yun He et al.

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Short summary
This study proposes a method to identify the sole presence of heterogeneous nucleation and competition between heterogeneous and homogeneous nucleation for dust-related cirrus clouds, by characterizing the relationship between dust ice-nucleating particle concentration calculated from CALIOP using POLIPHON method and in-cloud ice crystal number concentration from DARDAR dataset. Two typical cirrus cases are shown as a demonstration and the proposed method can be extended to a global scale.
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