Preprints
https://doi.org/10.5194/acp-2022-56
https://doi.org/10.5194/acp-2022-56
 
16 Feb 2022
16 Feb 2022
Status: this preprint is currently under review for the journal ACP.

CALIPSO Retrieval of Instantaneous Faint Aerosol

Feiyue Mao1,2, Ruixing Shi1, Daniel Rosenfeld3, Zengxin Pan3, Lin Zang4, Yannian Zhu5,6, and Xin Lu2 Feiyue Mao et al.
  • 1School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
  • 2State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, Wuhan 430079, China
  • 3Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
  • 4Chinese Antarctic Centre of Surveying and Mapping, Wuhan University, Wuhan 430079, China
  • 5School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China
  • 6Joint International Research Laboratory of Atmospheric and Earth System Sciences & Institute for Climate and Global Change Research, Nanjing University, Nanjing 210023, China

Abstract. Aerosols significantly affect the Earth-atmosphere energy balance and climate change by acting as cloud condensation nuclei. Particularly, the susceptibility of clouds to aerosols is more pronounced when the aerosols are faint. However, previous methodologies generally miss these faint aerosols and their climate effect based on instantaneous observations because they are too optically thin to be detected. Here, we focus on retrieving faint aerosol extinction based on instantaneous observations from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO). Results show a good agreement between faint aerosol extinction retrieval of CALIPSO and Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III-ISS) product over June 2017 to 2019 during nighttime, with correlation coefficients (R) and root mean square error (RMSE) of 0.58 in logarithmic scale and 0.0008, respectively. The lower bound of retrieved aerosol extinction extended to 0.0001 km−1 product (0.01 km−1, much lower than the CALIPSO Level 2 Extinction). The CALIPSO retrieval during daytime has a positive bias and low agreement with SAGE III-ISS with R and RMSE of 0.16 and 0.0034, respectively, due to the low signal-to-noise ratio caused by sunlight. Additionally, the retrieval at 20 km resolution successfully capture the enhanced faint aerosol from Siberian fires in 2019 instantaneously, which are also shown by CALIPSO monthly-averaged aerosol product at much lower temporal-spatial resolution. It indicates a significant potential for improving the quantification of aerosol impacts on climate change through retrieving instantaneous faint aerosol.

Feiyue Mao et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-56', Anonymous Referee #1, 02 Mar 2022
  • RC2: 'Comment on acp-2022-56', Anonymous Referee #2, 10 Mar 2022
  • RC3: 'Comment on acp-2022-56', Anonymous Referee #3, 10 Mar 2022
  • RC4: 'Comment on acp-2022-56', Anonymous Referee #4, 28 Mar 2022

Feiyue Mao et al.

Feiyue Mao et al.

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Short summary
Previous observations and methodologies generally miss the background faint aerosols because they are too optically thin to be detected. Here, we perform retrieval of faint aerosols based on instantaneous CALIPSO observation and validate the results by comparing them to SAGE product. The retrieval successfully captures the propagation of faint aerosols missed by CALIPSO product. The lower bound of aerosol extinction extended to 0.0001 km−1, much lower than CALIPSO Level 2 product (0.01 km−1).
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