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Discussion papers
https://doi.org/10.5194/acp-2019-185
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-185
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 May 2019

Research article | 08 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Wintertime Aerosol Measurements during the Chilean Coastal Orographic Precipitation Experiment

Sara Lynn Fults1, Adam K. Massmann2, Aldo Montecinos3, Elisabeth Andrews4,5, David E. Kingsmill5, Justin R. Minder2, René D. Garreaud6, and Jefferson R. Snider1 Sara Lynn Fults et al.
  • 1University of Wyoming, Laramie, WY
  • 2Universityat Albany, Albany, NY
  • 3Universidad de Concepción, Concepción, Chile
  • 4NOAA ESRL Global Monitoring Division, Boulder, CO
  • 5University of Colorado, Boulder, CO
  • 6Universidad de Chile, Santiago, Chile

Abstract. The Chilean Coastal Orographic Precipitation Experiment (CCOPE) was a three-month field campaign (June, July and August 2015) that investigated wintertime coastal rain events. Reported here are analyses of aerosol measurements made at a coastal site during CCOPE. The aerosol monitoring site was located near Arauco, Chile. Aerosol number concentrations and aerosol size distributions were acquired with a Condensation Particle Counter (CPC) and an Ultra High Sensitivity Aerosol Spectrometer (UHSAS). Arauco CPC concentrations were compared to those measured at the NOAA observatory Trinidad Head (THD) on the North Pacific Coast of California. The winter averaged CPC concentration at Arauco is 2971 cm−3 ± 1802 cm−3; at THD the average is 1059 cm−3 ± 855 cm−3. Despite the typically more pristine Southern Pacific region, the Arauco average is larger than at THD (p < 0.01). Aerosol size distribution measurements acquired during episodes of onshore flow were analyzed with Köhler theory and used to parameterize cloud condensation nuclei activation spectra. In addition, sea salt aerosol (SSA) concentration was parameterized as a function of sea surface wind speed. It is anticipated these parameterizations will be applied in modeling of wintertime Chilean coastal precipitation.

Sara Lynn Fults et al.
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Short summary
We analyze wintertime aerosol measurements from the Central Chilean Pacific Coast. The averaged aerosol particle concentration at our site (D > 0.01 μm) is larger than at a site on the California Pacific Coast. Additionally, size distributions sampled during intervals of onshore flow are used to parameterize aerosol properties relevant to cloud and precipitation processes. We anticipate that modeling of wintertime Chilean coastal rain events will benefit from the parameterizations we present.
We analyze wintertime aerosol measurements from the Central Chilean Pacific Coast. The averaged...
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