Atmospheric Chemistry and Physics Discussions This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract We report laboratory observations of H 2 SO 4 and H 2 O homogeneous nucleation made under atmospherically relevant conditions ([H 2 SO 4 ] of 10 6 – 10 7 cm −3 and 287 K)....

a Department of Organismic and Evolutionary Biology, 16 Divinity Avenue, Room 3092, Harvard University, Cambridge, MA 02138, United States b United States Geological Survey, 345 Middlefield Road, MS 434, Menlo Park, CA 94025, United States c University of California Santa Cruz, Institute of Marine Sciences, 1156 High Street, Santa Cruz, CA 95064, United States d H. Steinitz Marine Biological La...

We present two applications of adjoint modelling with the objective of diagnosing and simulating air pollution in an urban atmosphere. The concerned city is Paris and its surroundings. The first application is the sensitivity of an afternoon ozone peak to anthropogenic emissions and reaction rates. We show in particular the diurnal profile of sensitivity. Despite the paper being mostly methodol...

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Measuring atmospheric naphthalene with laser-induced fluorescence M. Martinez , H. Harder , X. Ren, R. L. Lesher, and W. H. Brune Department of Meteorology, Pennsylvania State University, University Park, Pennsylvania, USA now at: Max-Planck-Institut für Chemie, Mainz, Germany Received: 9 December 2003 – Accepted: 18 December 2003 – Published: 19 January 2004 Correspondence to: M. Martinez (mar...

Measurements of the sum of HO2NO2 and CH3O2NO2 in the remote troposphere J. G. Murphy, J. A. Thornton1 , P. J. Wooldridge, D. A. Day, R. S. Rosen, C. Cantrell, R. E. Shetter, B. Lefer, and R. C. Cohen 3, 4 University of California at Berkeley, Department of Chemistry, Berkeley, CA, USA National Center for Atmospheric Research, Atmospheric Chemistry Division, Boulder, CO, USA University of Calif...

Precambrian atmospheric pCO2 levels were previously estimated using a simple thermodynamic model based on the mineral assemblage in paleosols. In addition to theoretical flaws with that model, recalculation of pCO2 levels using more recent thermodynamic data gives significantly lower values. A new model based on the mass balance of weathering in paleosols gives consistent results from three sep...