Search Results - "Hegg, Dean"

Quantifying light absorption by organic carbon in Western North American snow by serial chemical extractions by Dang, Cheng, Hegg, Dean A.

“…Light‐absorbing particulates (LAPs) in snow, namely black carbon (BC), organic carbon (OC), and iron oxides, can reduce snow albedo and influence regional and…”
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An 11-year global gridded aerosol optical thickness reanalysis (v1.0) for atmospheric and climate sciences by Lynch, Peng, Reid, Jeffrey S, Westphal, Douglas L, Zhang, Jianglong, Hogan, Timothy F, Hyer, Edward J, Curtis, Cynthia A, Hegg, Dean A, Shi, Yingxi, Campbell, James R, Rubin, Juli I, Sessions, Walter R, Turk, F. Joseph, Walker, Annette L

“…While stand alone satellite and model aerosol products see wide utilization, there is a significant need in numerous atmospheric and climate applications for a…”
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Isotopic constraints on the formation pathways of sulfate aerosol in the marine boundary layer of the subtropical northeast Atlantic Ocean by Alexander, B., Allman, D. J., Amos, H. M., Fairlie, T. D., Dachs, J., Hegg, Dean A., Sletten, Ronald S.

“…We use observations of the oxygen‐17 excess of non‐sea salt sulfate aerosol (Δ17O(nssSO42−)) collected from two ship cruises in the subtropical northeast…”
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Sources of light-absorbing aerosol in arctic snow and their seasonal variation by Hegg, Dean A, Warren, Stephen G, Grenfell, Thomas C, Doherty, Sarah J, Clarke, Antony D

“…Two data sets consisting of measurements of light absorbing aerosols (LAA) in arctic snow together with suites of other corresponding chemical constituents are…”
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Source Attribution of Black Carbon in Arctic Snow by Hegg, Dean A, Warren, Stephen G, Grenfell, Thomas C, Doherty, Sarah J, Larson, Timothy V, Clarke, Antony D

“…Snow samples obtained at 36 sites in Alaska, Canada, Greenland, Russia, and the Arctic Ocean in early 2007 were analyzed for light-absorbing aerosol…”
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Observed vertical redistribution of black carbon and other insoluble light-absorbing particles in melting snow by Doherty, Sarah J., Grenfell, Thomas C., Forsström, Sanja, Hegg, Dean L., Brandt, Richard E., Warren, Stephen G.

“…Light‐absorbing impurities in snow reduce snow albedo, producing a positive radiative forcing, warming the surface air and snowpack, and accelerating snow…”
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Black carbon and other light-absorbing particles in snow of central North America by Doherty, Sarah J., Dang, Cheng, Hegg, Dean A., Zhang, Rudong, Warren, Stephen G.

“…Vertical profiles of light‐absorbing particles in seasonal snow were sampled from 67 North American sites. Over 500 snow samples and 55 soil samples from these…”
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Causes of variability in light absorption by particles in snow at sites in Idaho and Utah by Doherty, Sarah J., Hegg, Dean A., Johnson, James E., Quinn, Patricia K., Schwarz, Joshua P., Dang, Cheng, Warren, Stephen G.

“…A characterization of black carbon (BC) and other light‐absorbing particles in snow is presented for three mountain valley sites in Idaho in early 2014 and for…”
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SAM-CAAM: A Concept for Acquiring Systematic Aircraft Measurements to Characterize Aerosol Air Masses by Kahn, Ralph A., Berkoff, Tim A., Brock, Charles, Chen, Gao, Ferrare, Richard A., Ghan, Steven, Hansico, Thomas F., Hegg, Dean A., Martins, J. Vanderlei, McNaughton, Cameron S., Murphy, Daniel M., Ogren, John A., Penner, Joyce E., Pilewskie, Peter, Seinfeld, John H., Worsnop, Douglas R.

“…A modest program of systematic aircraft measurements can resolve key satellite-aerosol-data-record limitations. Satellite observations provide frequent, global…”
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Reconciliation of coarse mode sea-salt aerosol particle size measurements and parameterizations at a subtropical ocean receptor site by Reid, Jeffrey S., Brooks, Barbara, Crahan, Katie K., Hegg, Dean A., Eck, Thomas F., O'Neill, Norm, de Leeuw, Gerrit, Reid, Elizabeth A., Anderson, Kenneth D.

“…In August/September of 2001, the R/P FLIP and CIRPAS Twin Otter research aircraft were deployed to the eastern coast of Oahu, Hawaii, as part of the Rough…”
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An exploration of aqueous oxalic acid production in the coastal marine atmosphere by Crahan, Kathleen K, Hegg, Dean, Covert, David S, Jonsson, Haflidi

“…Oxalic acid is the most abundant dicarboxylic acid found in the troposphere, yet there is still no scientific consensus concerning its origins or formation…”
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Humidification factors for atmospheric aerosols off the mid-Atlantic coast of the United States by Kotchenruther, Robert A., Hobbs, Peter V., Hegg, Dean A.

“…The light‐scattering coefficients of aerosols as a function of relative humidity (RH) and wavelength were measured in flights off the mid‐Atlantic coast of the…”
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Chemical apportionment of aerosol column optical depth off the mid-Atlantic coast of the United States by Hegg, Dean A., Livingston, John, Hobbs, Peter V., Novakov, T., Russell, Philip

“…Aerosol column optical depths derived from airborne Sun photometer and in situ measurements of aerosol properties in 14 vertical profiles off the mid‐Atlantic…”
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Microphysical and dynamical controls on cirrus cloud optical depth distributions by Kay, Jennifer E., Baker, Marcia, Hegg, Dean

“…We assess microphysical and dynamical controls on cirrus cloud optical depth distributions [P(σ)] along idealized air parcel trajectories. We find P(σ) shape…”
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Water-soluble organic components in aerosols associated with savanna fires in southern Africa: Identification, evolution, and distribution by Gao, Song, Hegg, Dean A., Hobbs, Peter V., Kirchstetter, Thomas W., Magi, Brian I., Sadilek, Martin

“…During the SAFARI 2000 field campaign, both smoke aerosols from savanna fires and haze aerosols in the boundary layer and in the free troposphere were…”
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Airborne measurements of carbonaceous aerosols on the East Coast of the United States by Novakov, T., Hegg, Dean A., Hobbs, Peter V.

“…In this paper we report results of aircraft measurements of mass concentrations of carbonaceous aerosols, total aerosol mass, and simultaneously determined…”
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A comparison and summary of aerosol optical properties as observed in situ from aircraft, ship, and land during ACE-Asia by Doherty, Sarah J., Quinn, Patricia K., Jefferson, Anne, Carrico, Christian M., Anderson, Theodore L., Hegg, Dean

“…During the ACE‐Asia campaign in March–May 2001, in situ measurements of aerosol optical properties were made from multiple airborne and land‐ or ship‐based…”
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Estimates of aqueous-phase sulfate production from tandem differential mobility analysis by Santarpia, Joshua L., Collins, Don R., Hegg, Dean A., Kaku, Kathleen C., Covert, David S., Jonsson, Haflidi, Buzorius, Gintautas

“…During June and July of 2004, airborne measurements of size-resolved aerosol properties were made over the coastal Pacific near Marina, California. Tandem…”
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Determination of the Transmission Efficiency of an Aircraft Aerosol Inlet by Hegg, Dean A., Covert, David S., Jonsson, Haflidi, Covert, Paul A.

“…Data are reported for both airborne and wind tunnel testing of the aerosol inlet on the CIRPAS Twin Otter research aircraft. Though utilizing different…”
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An Instrument for Measuring Size-Resolved Aerosol Hygroscopicity at both Sub- and Super-Micron Sizes by Hegg, Dean A., Covert, David S., Jonsson, Haflidi, Covert, Paul A.

“…A new instrument to measure the size-resolved hygroscopic growth of both sub- and super-micron atmospheric aerosol is described. It consists of two white-light…”
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