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Aerosol and Cloud Experiments in the Eastern North Atlantic (ACE-ENA)

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  • 1 aCenter for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri, USA
  • | 2 bEnvironmental and Climate Science Department, Brookhaven National Laboratory, Upton, New York, USA
  • | 3 cDepartment of Atmospheric Science, University of Washington, Seattle, Washington, USA
  • | 4 dDepartment of Atmospheric Science, Colorado State University, Fort Collins, CO, USA
  • | 5 eSchool of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, USA.
  • | 6 fDepartment of Chemistry, Purdue University, West Lafayette, Indiana, USA
  • | 7 gDepartment of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana, USA
  • | 8 hDepartment of Atmospheric Sciences, Texas A&M University, College Station, Texas, USA
  • | 9 iCollaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing, China
  • | 10 jDepartment of Geography and Atmospheric Science, University of Kansas, Lawrence, Kansas, USA
  • | 11 kPacific Northwest National Laboratory, Richland, Washington, USA
  • | 12 lDepartment of Atmospheric Sciences, University of North Dakota, Grand Forks, North Dakota, USA
  • | 13 mDepartment of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri, USA
  • | 14 nDepartment of Atmosphere Science, Yonsei university, Seoul, Korea
  • | 15 oEarth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA
  • | 16 pCentre of Climate, Meteorology and Global Change (CMMG), University of Azores, Angra do Heroísmo, Portugal
  • | 17 qESCER Centre, Department of Earth and Atmospheric Sciences, University of Quebec at Montreal, Montreal, Quebec, Canada
  • | 18 rDepartment of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, USA
  • | 19 sArgonne National Laboratory, Argonne, IL, USA
  • | 20 tDepartment of Environmental Sciences, Rutgers University, New Brunswick, New Jersey, USA
  • | 21 uSonoma Technology Inc., Petaluma, CA, USA
  • | 22 vAtmospheric Sciences Program and Department of Physics, Michigan Technological University, Houghton, Michigan, USA
  • | 23 wDepartment of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
  • | 24 xSchool of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
  • | 25 yPhysics Department, University of Maryland Baltimore County (UMBC), Baltimore, MD, USA
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Abstract

With their extensive coverage, marine low clouds greatly impact global climate. Presently, marine low clouds are poorly represented in global climate models, and the response of marine low clouds to changes in atmospheric greenhouse gases and aerosols remains the major source of uncertainty in climate simulations. The Eastern North Atlantic (ENA) is a region of persistent but diverse subtropical marine boundary layer clouds, whose albedo and precipitation are highly susceptible to perturbations in aerosol properties. In addition, the ENA is periodically impacted by continental aerosols, making it an excellent location to study the cloud condensation nuclei (CCN) budget in a remote marine region periodically perturbed by anthropogenic emissions, and to investigate the impacts of long-range transport of aerosols on remote marine clouds. The Aerosol and Cloud Experiments in Eastern North Atlantic (ACE-ENA) campaign was motivated by the need of comprehensive in-situ measurements for improving the understanding of marine boundary layer CCN budget, cloud and drizzle microphysics, and the impact of aerosol on marine low cloud and precipitation. The airborne deployments took place from June 21 to July 20, 2017 and January 15 to February 18, 2018 in the Azores. The flights were designed to maximize the synergy between in-situ airborne measurements and ongoing long-term observations at a ground site. Here we present measurements, observation strategy, meteorological conditions during the campaign, and preliminary findings. Finally, we discuss future analyses and modeling studies that improve the understanding and representation of marine boundary layer aerosols, clouds, precipitation, and the interactions among them.

Current affiliation: JUUL Labs, San Francisco, CA, USA

Current affiliation: Ohio State University, Columbus, OH, USA

Current affiliation: Environmental and Climate Science Department, Brookhaven National Laboratory, Upton, New York, USA

Corresponding author: Jian Wang, jian@wustl.edu

Abstract

With their extensive coverage, marine low clouds greatly impact global climate. Presently, marine low clouds are poorly represented in global climate models, and the response of marine low clouds to changes in atmospheric greenhouse gases and aerosols remains the major source of uncertainty in climate simulations. The Eastern North Atlantic (ENA) is a region of persistent but diverse subtropical marine boundary layer clouds, whose albedo and precipitation are highly susceptible to perturbations in aerosol properties. In addition, the ENA is periodically impacted by continental aerosols, making it an excellent location to study the cloud condensation nuclei (CCN) budget in a remote marine region periodically perturbed by anthropogenic emissions, and to investigate the impacts of long-range transport of aerosols on remote marine clouds. The Aerosol and Cloud Experiments in Eastern North Atlantic (ACE-ENA) campaign was motivated by the need of comprehensive in-situ measurements for improving the understanding of marine boundary layer CCN budget, cloud and drizzle microphysics, and the impact of aerosol on marine low cloud and precipitation. The airborne deployments took place from June 21 to July 20, 2017 and January 15 to February 18, 2018 in the Azores. The flights were designed to maximize the synergy between in-situ airborne measurements and ongoing long-term observations at a ground site. Here we present measurements, observation strategy, meteorological conditions during the campaign, and preliminary findings. Finally, we discuss future analyses and modeling studies that improve the understanding and representation of marine boundary layer aerosols, clouds, precipitation, and the interactions among them.

Current affiliation: JUUL Labs, San Francisco, CA, USA

Current affiliation: Ohio State University, Columbus, OH, USA

Current affiliation: Environmental and Climate Science Department, Brookhaven National Laboratory, Upton, New York, USA

Corresponding author: Jian Wang, jian@wustl.edu
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