Ambient aerosol properties in the remote atmosphere from global-scale in situ measurements

Autor(en)

Charles A. Brock, Karl D. Froyd, Maximilian Dollner, Christina J. Williamson, Gregory Schill, Daniel M. Murphy, Nicholas J. Wagner, Agnieszka Kupc, Jose L. Jimenez, Pedro Campuzano-Jost, Benjamin A. Nault, Jason C. Schroder, Douglas A. Day, Derek J. Price, Bernadett Weinzierl, Joshua P. Schwarz, Joseph M. Katich, Siyuan Wang, Linghan Zeng, Rodney Weber, Jack Dibb, Eric Scheuer, Glenn S. Diskin, Joshua P. DiGangi, ThaoPaul Bui, Jonathan M. Dean-Day, Chelsea R. Thompson, Jeff Peischl, Thomas B. Ryerson, Ilann Bourgeois, Bruce C. Daube, Roisin Commane, Steven C. Wofsy

Abstrakt

In situ measurements of aerosol microphysical, chemical, and optical properties were made during globalscale flights from 2016-2018 as part of the Atmospheric Tomography Mission (ATom). The NASA DC-8 aircraft flew from similar to 84 degrees N to similar to 86 degrees S latitude over the Pacific, Atlantic, Arctic, and Southern oceans while profiling nearly continuously between altitudes of similar to 160m and similar to 12 km. These global circuits were made once each season. Particle size distributions measured in the aircraft cabin at dry conditions and with an underwing probe at ambient conditions were combined with bulk and single-particle composition observations and measurements of water vapor, pressure, and temperature to estimate aerosol hygroscopicity and hygroscopic growth factors and calculate size distributions at ambient relative humidity. These reconstructed, composition-resolved ambient size distributions were used to estimate intensive and extensive aerosol properties, including single-scatter albedo, the asymmetry parameter, extinction, absorption, Angstrom exponents, and aerosol optical depth (AOD) at several wavelengths, as well as cloud condensation nuclei (CCN) concentrations at fixed supersaturations and lognormal fits to four modes. Dry extinction and absorption were compared with direct in situ measurements, and AOD derived from the extinction profiles was compared with remotely sensed AOD measurements from the ground-based Aerosol Robotic Network (AERONET); this comparison showed no substantial bias.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

National Oceanic and Atmospheric Administration, University of Colorado, Boulder, Georgia Institute of Technology, University of New Hampshire, National Aeronautics & Space Administration (NASA), Bay Area Environmental Research Institute, Harvard University, Columbia University in the City of New York

Journal

Atmospheric Chemistry and Physics

Band

21

Seiten

15023-15063

Anzahl der Seiten

41

ISSN

1680-7316

DOI

https://doi.org/10.5194/acp-21-15023-2021

Publikationsdatum

10-2021

Peer-reviewed

Ja

ÖFOS 2012

103037 Umweltphysik, 103039 Aerosolphysik, 105206 Meteorologie

Schlagwörter

ASJC Scopus Sachgebiete

Atmospheric Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/735e853b-47ce-4c48-bfba-ccda52854699