colleagues at the Statewide Air Pollution Research Center at the University of California, Riverside; the Departments of Chemistry and Earth System Science at the University of California, Irvine; and the California Air Resources Board.We thank T. Nielsen, J. Johnson, J. Seiber, A. R. Ravishankara, M. O. Andreae, and P. J. Crutzen for helpful discussions; B. T. Jobson and D. Kley for permission...

In this technical note we present the multipurpose atmospheric chemistry model MECCA. Owing to its versatility and modular structure, it can be used for tropospheric as well as stratospheric chemistry calculations. Extending the code to other domains (e.g. mesospheric or oceanic chemistry) is easily possible. MECCA contains a compre-5 hensive atmospheric reaction mechanism that currently includ...

1 Molina Center for the Energy and the Environment, San Diego, California, USA 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA 3 Center for Atmospheric and Environmental Chemistry; Center for Cloud and Aerosol Chemistry, Aerodyne Research Inc., Billerica, Massachusetts, USA 4 Department of Chemistry, Montana State U...

Particles present in the Earth’s atmosphere provide reactive surfaces for potentially important chemistry. The role of heterogeneous reactions of trace atmospheric gases on solid aerosol surfaces present in the troposphere is not well understood. Laboratory investigations can provide a basis for understanding the detailed molecularlevel physical chemistry of these atmospheric reactions. Kinetic...

The NOAA-15 weather satellite carries the Advanced Microwave Sounding Units-A and -B (AMSU-A, AMSU-B) which measure thermal emission from an atmospheric oxygen band, two water lines, and several window frequencies. An iterated minimum-variance algorithm retrieves profiles of temperature and humidity in the atmosphere from this data. Relative humidity is converted into absolute humidity with use...

The process of collision between particles is a subject of interest in many fields of physics, astronomy, polymer physics, atmospheric physics, and colloid chemistry. If two types of particles are allowed to participate in the cluster coalescence, then the time evolution of the cluster distribution has been described by an infinite system of ordinary differential equations. In this paper, we de...

1 Laboratory for Atmospheric Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland 2 Leibniz-Institute for Tropospheric Research, 04318 Leipzig, Germany 3 School of Earth, Atmospheric and Environmental Sciences, University of Manchester, M60 1QD, UK 4 Institute for Atmospheric Physics, German Aerospace Centre, 82234 Wessling, Germany * now at: Institute for Atmospheric and Climate S...

The characterisation of pollution aerosol in a changing photochemical environment M. J. Cubison, M. R. Alfarra, J. Allan, K. N. Bower, H. Coe, G. B. McFiggans, J. D. Whitehead, P. I. Williams, Q. Zhang, J. L. Jimenez, J. Hopkins, and J. Lee School of Earth, Atmospheric and Environmental Science, University of Manchester, Manchester, UK Dept. of Chemistry and Biochemistry and Cooperative Institu...