Title The Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission; design, execution, and first results
Author Jacob, D.J.; Crawford, J.H.; Maring, H.; Clarke, A.D.; Dibb, J.E.; Emmons, L.K.; Ferrare, R.A.; Hostetler, C.A.; Russell, P.B.; Singh, H.B.; Thompson, A.M.; Shaw, G.E.; McCauley, E.; Pederson, J.R.; Fisher, J.A.
Author Affil Jacob, D.J., Harvard University, Cambridge, MA. Other: NASA, Langley Research Center; NASA Headquarters; University of Hawaii; University of New Hampshire; National Center for Atmospheric Research; NASA, Ames Research Center; Pennsylvania State University; University of Alaska; California Air Resources Board
Source Atmospheric Chemistry and Physics, 10(11), p.5191-5212. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2010
Notes In English. Part of special issue no. 182, POLARCAT (Polar study using aircraft, remote sensing, surface measurements and models, of climate, chemistry, aerosols, and transport), edited by Stohl, A., et al., http://www.atmos-chem- phys.net/special_issue182.html; published in Atmospheric Chemistry and Physics Discussions: 9 March 2010, http://www.atmos- chem-phys-discuss.net/9/17073/2009/acpd-9- 17073-2009.html ; accessed in May, 2011. 178 refs. GeoRef Acc. No: 310041. CRREL Acc. No: 65006811
Index Terms aircraft; boundary layer; composition; fires; firn; human activity; hydrocarbons; pollution; remote sensing; statistical analysis; stratosphere; United States-- Alaska; Antarctica; United States-- California; Greenland; Asia--Siberia; Canada-- Western Canada; air pollution; Alaska; aliphatic hydrocarbons; alkanes; Arctic region; Arctic Research of the Composition of the Troposphere from Aircraft and Satellites; Asia; atmospheric transport; bromine monoxide; calibration; California; Canada; climate forcing; depletion; greenhouse gases; hexafluoroethane; ice cores; methane; nonpoint sources; octafluoropropane; organic compounds; satellite methods; seasonal variations; Siberia; solar forcing; tetrafluoromethane; time series analysis; transport; troposphere; United States; Western Canada
Abstract The NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission was conducted in two 3-week deployments based in Alaska (April 2008) and western Canada (June-July 2008). Its goal was to better understand the factors driving current changes in Arctic atmospheric composition and climate, including (1) influx of mid-latitude pollution, (2) boreal forest fires, (3) aerosol radiative forcing, and (4) chemical processes. The June-July deployment was preceded by one week of flights over California (ARCTAS-CARB) focused on (1) improving state emission inventories for greenhouse gases and aerosols, (2) providing observations to test and improve models of ozone and aerosol pollution. ARCTAS involved three aircraft: a DC-8 with a detailed chemical payload, a P-3 with an extensive aerosol and radiometric payload, and a B-200 with aerosol remote sensing instrumentation. The aircraft data augmented satellite observations of Arctic atmospheric composition, in particular from the NASA A- Train. The spring phase (ARCTAS-A) revealed pervasive Asian pollution throughout the Arctic as well as significant European pollution below 2 km. Unusually large Siberian fires in April 2008 caused high concentrations of carbonaceous aerosols and also affected ozone. Satellite observations of BrO column hotspots were found not to be related to Arctic boundary layer events but instead to tropopause depressions, suggesting the presence of elevated inorganic bromine (5- 10 pptv) in the lower stratosphere. Fresh fire plumes from Canada and California sampled during the summer phase (ARCTAS-B) indicated low NOx emission factors from the fires, rapid conversion of NOx to PAN, no significant secondary aerosol production, and no significant ozone enhancements except when mixed with urban pollution.
URL http://www.atmos-chem-phys.net/10/5191/2010/acp-10-5191-2010.pdf
Publication Type journal article
Record ID 91471