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The Two-Column Aerosol Project: Phase I-Overview and impact of elevated aerosol layers on aerosol optical depth

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1002/2015JD023848· OSTI ID:1336066
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  1. Pacific Northwest National Laboratory, Richland, WA (United States)
  2. University of Nevada, Reno, NV (United States)
  3. NASA Langley Research Center, Hampton, VA (United States)
  4. NASA Goddard Institute for Space Studies, New York, NY (United States)
  5. NASA Ames Research Center, Moffett Field, CA (United States)
  6. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  7. NOAA Earth System Research Laboratory, Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States). Cooperative Institute for Research in Environmental Sciences
  8. McGill Univ., Montreal, QC (Canada). Department of Atmospheric and Oceanic Sciences
  9. Univ. of Colorado, Boulder, CO (United States). Cooperative Institute for Research in Environmental Sciences
  10. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  11. Rutgers Univ., New Brunswick, NJ (United States). Institute of Earth, Ocean, and Atmospheric Sciences
  12. NOAA Earth System Research Laboratory, Boulder, CO (United States)
  13. Univ. of Colorado, Boulder, CO (United States). Cooperative Institute for Research in Environmental Sciences and Department of Chemistry and Biochemistry
  14. Brookhaven National Lab. (BNL), Upton, NY (United States)
  15. NASA ARC-CREST BAER, Moffett Field, CA (United States)
  16. National Park Service, Cape Cod National Seashore, Wellfleet, MA (United States)
+ Show Author Affiliations
The Two-Column Aerosol Project (TCAP), conducted from June 2012 through June 2013, was a unique study designed to provide a comprehensive data set that can be used to investigate a number of important climate science questions, including those related to aerosol mixing state and aerosol radiative forcing. The study was designed to sample the atmosphere between and within two atmospheric columns; one fixed near the coast of North America (over Cape Cod, MA) and a second moveable column over the Atlantic Ocean several hundred kilometers from the coast. The U.S. Department of Energy's (DOE) Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF) was deployed at the base of the Cape Cod column, and the ARM Aerial Facility was utilized for the summer and winter intensive observation periods. One important finding from TCAP is that four of six nearly cloud-free flight days had aerosol layers aloft in both the Cape Cod and maritime columns that were detected using the nadir pointing second-generation NASA high-spectral resolution lidar (HSRL-2). In addition, these layers contributed up to 60% of the total observed aerosol optical depth (AOD). Many of these layers were also intercepted by the aircraft configured for in situ sampling, and the aerosol in the layers was found to have increased amounts of biomass burning material and nitrate compared to aerosol found near the surface. Lastly, while there was a great deal of spatial and day-to-day variability in the aerosol chemical composition and optical properties, no systematic differences between the two columns were observed.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC06-76RL01830; SC0006080; SC0012704
OSTI ID:
1336066
Alternate ID(s):
OSTI ID: 1402316
OSTI ID: 1239469
Report Number(s):
BNL--112440-2016-JA; KP1701000
Journal Information:
Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 1 Vol. 121; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Deriving brown carbon from multiwavelength absorption measurements: method and application to AERONET and Aethalometer observations journal January 2016
Combining airborne in situ and ground-based lidar measurements for attribution of aerosol layers journal January 2018
Estimating cloud condensation nuclei number concentrations using aerosol optical properties: role of particle number size distribution and parameterization journal January 2019
Aerosol properties and their influences on low warm clouds during the Two-Column Aerosol Project journal January 2019
Combining airborne in situ and ground-based lidar measurements for attribution of aerosol layers journal January 2018
Aerosol Properties and Their Influences on Low Warm Clouds during the Two-Column Aerosol Project posted_content February 2019

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