Browsing by Author "Yantosca, Robert"

Now showing items 1-20 of 48

    • Air mass factor formulation for spectroscopic measurements from satellites: Application to formaldehyde retrievals from the Global Ozone Monitoring Experiment 

      Palmer, Paul I.; Jacob, Daniel James; Chance, Kelly V.; Martin, Randall V.; Spurr, Robert J. D.; Kurosu, Thomas; Bey, Isabelle; Yantosca, Robert M.; Fiore, Arlene; Li, Qinbin (Wiley-Blackwell, 2001)
      We present a new formulation for the air mass factor (AMF) to convert slant column measurements of optically thin atmospheric species from space into total vertical columns. Because of atmospheric scattering, the AMF depends ...

    • Air-Sea Exchange in the Global Mercury Cycle 

      Strode, Sarah A.; Jaeglé, Lyatt; Selin, Noelle E.; Jacob, Daniel J.; Park, Rokjin J.; Yantosca, Robert M.; Mason, Robert P.; Slemr, Franz (American Geophysical Union, 2007)
      We present results from a new global atmospheric mercury model coupled with a mixed layer slab ocean. The ocean model describes the interactions of the mixed layer with the atmosphere and deep ocean, as well as conversion ...

    • Asian chemical outflow to the Pacific in spring: Origins, pathways, and budgets 

      Bey, Isabelle; Jacob, Daniel James; Logan, Jennifer A.; Yantosca, Robert M. (Wiley-Blackwell, 2001)
      We analyze the Asian outflow of CO, ozone, and nitrogen oxides (NOx) to the Pacific in spring by using the GEOS-CHEM global three-dimensional model of tropospheric chemistry and simulating the Pacific Exploratory Mission-West ...

    • Atmospheric budget of acetone 

      Jacob, Daniel James; Field, Brendan; Jin, Emily; Bey, Isabelle; Li, Qinbin; Logan, Jennifer A.; Yantosca, Robert M.; Singh, Hanwant (Wiley-Blackwell, 2002)
      The atmospheric budget and distribution of acetone are investigated by using a priori estimates of sources and sinks to constrain a global three-dimensional atmospheric model simulation and then using atmospheric observations ...

    • Atmospheric hydrogen cyanide (HCN): Biomass burning source, ocean sink? 

      Li, Qinbin; Jacob, Daniel James; Bey, Isabelle; Yantosca, Robert M.; Zhao, Yongjing; Kondo, Yutaka; Notholt, Justus (Wiley-Blackwell, 2000)
      The observed seasonal amplitude of atmospheric HCN concentrations implies an atmospheric lifetime of only a few months for HCN, much shorter than is commonly assumed from oxidation by OH (a few years). We propose that ocean ...

    • Atmospheric Peroxyacetyl Nitrate (PAN): A Global Budget and Source Attribution 

      Fischer, E. V.; Jacob, Daniel James; Yantosca, Robert M.; Sulprizio, Melissa Payer; Millet, D. B.; Mao, J.; Paulot, F.; Singh, H. B.; Roiger, A.; Ries, L.; Talbot, R. W.; Dzepina, K.; Pandey Deolal, S. (Copernicus GmbH, 2014)
      Peroxyacetyl nitrate (PAN) formed in the atmospheric oxidation of non-methane volatile organic compounds (NMVOCs) is the principal tropospheric reservoir for nitrogen oxide radicals \((NO_x = NO + NO_2)\). PAN enables the ...

    • Background ozone over the United States in summer: Origin, trend, and contribution to pollution episodes 

      Fiore, Arlene M.; Jacob, Daniel James; Bey, Isabelle; Yantosca, Robert M.; Field, Brendan; Fusco, Andrew; Wilkinson, James (Wiley-Blackwell, 2002)
      Observations indicate that ozone (O3) concentrations in surface air over the United States in summer contain a 20–45 ppbv background contribution, presumably reflecting transport from outside the North American boundary ...

    • Chemical Cycling and Deposition of Atmospheric Mercury: Global Constraints from Observations 

      Selin, Noelle E.; Jacob, Daniel J.; Park, Rokjin J.; Yantosca, Robert M.; Strode, Sarah; Jaeglé, Lyatt; Jaffe, Daniel (American Geophysical Union, 2007)
      We use a global 3-D model of atmospheric mercury (GEOS-Chem) to interpret worldwide observations of total gaseous mercury (TGM) and reactive gaseous mercury (RGM) in terms of the constraints they provide on the chemical ...

    • Constraints from 210 Pb and 7 Be on wet deposition and transport in a global three-dimensional chemical tracer model driven by assimilated meteorological fields 

      Liu, Hongyu; Jacob, Daniel James; Bey, Isabelle; Yantosca, Robert M. (Wiley-Blackwell, 2001)
      The atmospheric distributions of the aerosol tracers 210Pb and 7Be are simulated with a global three-dimensional model driven by assimilated meteorological observations for 1991–1996 from the NASA Goddard Earth Observing ...

    • Constraints on Asian and European sources of methane from CH 4 -C 2 H 6 -CO correlations in Asian outflow 

      Xiao, Yaping; Jacob, Daniel James; Wang, James; Logan, Jennifer A.; Palmer, Paul; Suntharalingam, Parvadha; Yantosca, Robert M.; Sachse, Glen; Blake, Donald; Streets, David (Wiley-Blackwell, 2004)
      Aircraft observations of Asian outflow from the Transport and Chemical Evolution Over the Pacific (TRACE-P) aircraft mission over the NW Pacific (March and April 2001) show large CH4 enhancements relative to background, ...

    • Constraints on the sources of tropospheric ozone from 210Pb-7Be-O3 correlations 

      Liu, Hongyu; Jacob, Daniel James; Dibb, Jack; Fiore, Arlene; Yantosca, Robert M. (Wiley-Blackwell, 2004)
      The 210Pb-7Be-O3 relationships observed in three aircraft missions over the western Pacific (PEM-West A and B, TRACE-P) are simulated with a global three-dimensional chemical tracer model (GEOS-CHEM) driven by assimilated ...

    • Convective outflow of South Asian pollution: A global CTM simulation compared with EOS MLS observations 

      Li, Qinbin; Jiang, Jonathan H.; Wu, Dong L.; Read, William G.; Livesey, Nathaniel J.; Waters, Joe W.; Zhang, Yongsheng; Wang, Bin; Filipiak, Mark J.; Davis, Cory P.; Turquety, Solene; Wu, Shiliang; Park, Rokjin J.; Yantosca, Robert M.; Jacob, Daniel James (Wiley-Blackwell, 2005)
      A global 3-D chemical transport model is used to analyze observations of carbon monoxide (CO) and upper tropospheric clouds from the EOS Microwave Limb Sounder (MLS). MLS observations during 25 August–6 September 2004 ...

    • Development of a grid-independent GEOS-chem chemical transport model as an atmospheric chemistry module for Earth System Models 

      Long, Michael Smither; Yantosca, Robert M.; Nielsen, J. E.; Keller, Christoph Andrea; da Silva, A.; Sulprizio, Melissa Payer; Pawson, S.; Jacob, Daniel James (Copernicus GmbH, 2014)
      The GEOS-Chem global chemical transport model (CTM), used by a large atmospheric chemistry research community, has been re-engineered to also serve as an atmospheric chemistry module for Earth System Models (ESMs). This ...

    • Distribution and fate of selected oxygenated organic species in the troposphere and lower stratosphere over the Atlantic 

      Singh, H.; Chen, Y.; Tabazadeh, A.; Fukui, Y.; Bey, I.; Yantosca, Robert M.; Jacob, Daniel James; Arnold, F.; Wohlfrom, K.; Atlas, E.; Flocke, F.; Blake, D.; Blake, N.; Heikes, B.; Snow, J.; Talbot, R.; Gregory, G.; Sachse, G.; Vay, S.; Kondo, Yasuyuki (Wiley-Blackwell, 2000)
      A large number of oxygenated organic chemicals (peroxyacyl nitrates, alkyl nitrates, acetone, formaldehyde, methanol, methylhydroperoxide, acetic acid and formic acid) were measured during the 1997 Subsonic Assessment ...

    • Export of NOy from the North American boundary layer: Reconciling aircraft observations and global model budgets 

      Li, Qinbin; Jacob, Daniel James; Munger, J. William; Yantosca, Robert M.; Parrish, David (Wiley-Blackwell, 2004)
      Fossil fuel combustion accounts for >50% of the global atmospheric emission of NOx, but this source is concentrated in the polluted continental boundary layer (CBL) and only a small fraction is exported as NOy (NOx and its ...

    • Factors Driving Mercury Variability in the Arctic Atmosphere and Ocean over the Past 30 Years 

      Fisher, Jenny A.; Jacob, Daniel James; Soerensen, Anne Laerke; Amos, Helen Marie; Corbitt, Elizabeth Sturges; Streets, David G.; Wang, Qiaoqiao; Yantosca, Robert M.; Sunderland, Elynor M (Wiley-Blackwell, 2013)
      [1] Long-term observations at Arctic sites (Alert and Zeppelin) show large interannual variability (IAV) in atmospheric mercury (Hg), implying a strong sensitivity of Hg to environmental factors and potentially to climate ...

    • Gas-Particle Partitioning of Atmospheric Hg(II) and Its Effect on Global Mercury Deposition 

      Amos, Helen Marie; Jacob, Daniel J.; Holmes, C. D.; Fisher, Jenny Allison; Wang, Qiaoqiao; Yantosca, Robert M.; Corbitt, Elizabeth Sturges; Galarneau, E.; Rutter, A. P.; Gustin, M. S.; Steffen, A.; Schauer, J. J.; Graydon, J. A.; Louis, V. L. St.; Talbot, R. W.; Edgerton, E. S.; Zhang, Y.; Sunderland, Elynor M (Copernicus GmbH, 2012)
      Atmospheric deposition of Hg(II) represents a major input of mercury to surface environments. The phase of Hg(II) (gas or particle) has important implications for deposition. We use long-term observations of reactive gaseous ...

    • Global 3-D Land-Ocean-Atmosphere Model for Mercury: Present-Day Versus Preindustrial Cycles and Anthropogenic Enrichment Factors for Deposition 

      Selin, Noelle E.; Jacob, Daniel J.; Yantosca, Robert M.; Strode, Sarah; Jaegle, Lyatt; Sunderland, Elsie M. (American Geophysical Union, 2008)
      We develop a mechanistic representation of land-atmosphere cycling in a global 3-D ocean-atmosphere model of mercury (GEOS-Chem). The resulting land-ocean-atmosphere model is used to construct preindustrial and present ...

    • Global and regional decreases in tropospheric oxidants from photochemical effects of aerosols 

      Martin, Randall V.; Jacob, Daniel James; Yantosca, Robert M.; Chin, Mian; Ginoux, Paul (Wiley-Blackwell, 2003)
      We evaluate the sensitivity of tropospheric OH, O3, and O3 precursors to photochemical effects of aerosols not usually included in global models: (1) aerosol scattering and absorption of ultraviolet radiation and (2) ...

    • Global Budget of Ethane and Regional Constraints on U.S. Sources 

      Xiao, Yaping; Logan, Jennifer A.; Jacob, Daniel J.; Hudman, Rynda C.; Yantosca, Robert M.; Blake, Donald R. (American Geophysical Union, 2008)
      We use a 3-D chemical transport model (the GEOS-Chem CTM) to evaluate a global emission inventory for ethane (C2H6), with a best estimate for the global source of 13 Tg yr−1, 8.0 Tg yr−1 from fossil fuel production, 2.6 ...