04 Oct 2022
04 Oct 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Aerosol vertical profiles over the Western North Atlantic Ocean during the North Atlantic Aerosols and Marine Ecosystems Study (NAAMES)

Francesca Gallo1,2, Kevin J. Sanchez1, Bruce E. Anderson1, Ryan Bennett3, Matthew D. Brown1,4, Ewan C. Crosbie1,4, Chris Hostetler1, Carolyn Jordan1,5, Melissa Yang Martin1, Claire E. Robinson1,4, Lynn M. Russell6, Taylor J. Shingler1, Michael A. Shook1, Kenneth L. Thornhill1,4, Elizabeth B. Wiggins1, Edward L. Winstead1,4, Armin Wisthaler7,8, Luke D. Ziemba1, and Richard H. Moore1 Francesca Gallo et al.
  • 1NASA Langley Research Center, Hampton, VA
  • 2NASA Postdoctoral Program, Oak Ridge Associated Universities, Oak Ridge, TN
  • 3Bay Area Environmental Research Institute, Moffett Field, CA, USA
  • 4Science Systems and Applications, Inc., Hampton, VA
  • 5National Institute of Aerospace, Hampton, VA
  • 6Scripps Institution of Oceanography, San Diego, CA
  • 7Institute for Ion Physics and Applied Physics, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
  • 8Department of Chemistry, University of Oslo, P.O. 1033 – Blindern, 0315 Oslo, Norway

Abstract. The NASA North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) ship and aircraft field campaign deployed to the western subarctic Atlantic between the years 2015 and 2018. One of the primary goals of NAAMES is to improve the understanding of aerosol-cloud interactions (ACI) over the Atlantic Ocean under different seasonal regimes. ACI currently represent the largest source of uncertainty in global climate models. During three NAAMES field campaigns (NAAMES-1 in November 2015, NAAMES-2 in May 2016, and NAAMES-3 in September 2017) multiple 10-hour science flights were conducted using the NASA C-130 aircraft to measure marine boundary layer aerosol and cloud properties. The standard flight pattern includes vertical spirals where the C-130 transitioned from high altitude to low-latitude (and vice versa) collecting in-situ measurements of aerosols, trace gases, clouds, and meteorological parameters as a function of altitude. We examine the data collected from 37 spirals during the three NAAMES field campaigns, and we present a comprehensive characterization of the vertical profiles of aerosol properties under different synoptic conditions and aerosol regimes. The vertical distribution of submicron aerosol particles exhibited strong seasonal variation depending on emission sources and aerosol processes in the atmospheric column. Pristine marine conditions and new particle formation were prevalent in the wintertime (NAAMES-1) due to low biogenic emissions from the surface ocean and reduced continental influence. Higher concentrations of submicron aerosol particles were observed in the spring (NAAMES-2) due to strong phytoplankton activity and the arrival of long-range-transported continental plumes in the free troposphere with subsequent entrainment into the marine boundary layer. Biomass burning from boreal wildfires was the main source of aerosol particles in the region during the late summer (NAAMES-3) in both the marine boundary layer and free troposphere.

Francesca Gallo et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on acp-2022-654', Harry ten Brink, 05 Oct 2022
  • RC1: 'Comment on acp-2022-654', Anonymous Referee #1, 19 Oct 2022
  • RC2: 'Comment on acp-2022-654', Anonymous Referee #2, 10 Nov 2022

Francesca Gallo et al.

Data sets

North Atlantic Aerosols and Marine Ecosystems Study NASA Langley Research Center Atmospheric Science Data Center

Francesca Gallo et al.


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Short summary
We integrate in-situ ship- and aircraft-based measurements of aerosol, trace gases, and meteorological parameters collected during the NASA North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) field campaigns in the Western North Atlantic Ocean region. A comprehensive characterization of the vertical profiles of aerosol properties under different seasonal regimes is provide for improving the understanding of aerosol key processes and aerosol cloud interactions in marine regions.