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Lin Y, Takano Y, Gu Y, Wang Y, Zhou S, Zhang T, Zhu K, Wang J, Zhao B, Chen G, Zhang D, Fu R, Seinfeld J. Characterization of the aerosol vertical distributions and their impacts on warm clouds based on multi-year ARM observations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 904:166582. [PMID: 37634734 DOI: 10.1016/j.scitotenv.2023.166582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 08/23/2023] [Accepted: 08/24/2023] [Indexed: 08/29/2023]
Abstract
Aerosol vertical distribution plays a crucial role in cloud development and thus precipitation since both aerosol indirect and semi-direct effects significantly depend on the relative position of aerosol layer in reference to cloud, but its precise influence on cloud remains unclear. In this study, we integrated multi-year Raman Lidar measurements of aerosol vertical profiles from the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) facility with available Value-Added Products of cloud features to characterize aerosol vertical distributions and their impacts on warm clouds over the continental and marine ARM atmospheric observatories, i.e., Southern Great Plains (SGP) and Eastern North Atlantic (ENA). A unimodal seasonal distribution of aerosol optical depths (AODs) with a peak in summer is found at upper boundary layer over SGP, while a bimodal distribution is observed at ENA for the AODs at lower levels with a major winter-spring maximum. The diurnal mean of upper-level AOD at SGP shows a maximum in the early evening. According to the relative positions of aerosol layers to clouds we further identify three primary types of aerosol vertical distribution, including Random, Decreasing, and Bottom. It is found that the impacts of aerosols on cloud may or may not vary with aerosol vertical distribution depending on environmental conditions, as reflected by the wide variations of the relations between AOD and cloud properties. For example, as AOD increases, the liquid water paths (LWPs) tend to be reduced at SGP but enhanced at ENA. The relations of cloud droplet effective radius with AOD largely depend on aerosol vertical distributions, particularly showing positive values in the Random type under low-LWP condition (<50 g m-2). The distinct features of aerosol-cloud interactions in relation to aerosol vertical distribution are likely attributed to the continental-marine contrast in thermodynamic environments and aerosol conditions between SGP and ENA.
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Affiliation(s)
- Yun Lin
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States.
| | - Yoshihide Takano
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States
| | - Yu Gu
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States
| | - Yuan Wang
- Department of Earth System Science, Stanford University, Stanford, CA, United States
| | - Shujun Zhou
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States
| | - Tianhao Zhang
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States
| | - Kuilin Zhu
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States
| | - Jingyu Wang
- National Institute of Education, Nanyang Technological University, Singapore
| | - Bin Zhao
- Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States
| | - Gang Chen
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States
| | - Damao Zhang
- Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States
| | - Rong Fu
- Department of Atmospheric and Oceanic Sciences, Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA 90095, United States
| | - John Seinfeld
- California Institute of Technology, Pasadena, CA 91125, United States
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