An ion drift-chemical ionization mass spectrometry (ID-CIMS) technique has been developed to detect and quantify trace gases, including volatile organic compounds and inorganic species. The trace species are chemically ionized into positive or negative product ions with a well-controlled ion-molecule reaction time. The ID-CIMS method allows for quantification of the trace gases without the nece...

We present a one-dimensional model of scavenging of soluble gaseous pollutants by evaporating droplets which is valid for arbitrary initial vertical distribution of soluble trace gases in the atmosphere. It is shown that for low gradients of soluble trace gases in the atmosphere gas scavenging is determined by a linear wave equation that describes propagation of a wave in one direction. The der...

Palaeoclimate data show that the Earth's climate is remarkably sensitive to global forcings. Positive feedbacks predominate. This allows the entire planet to be whipsawed between climate states. One feedback, the 'albedo flip' property of ice/water, provides a powerful trigger mechanism. A climate forcing that 'flips' the albedo of a sufficient portion of an ice sheet can spark a cataclysm. Ine...

Differential optical absorption spectroscopy (DOAS) has become a widely used method to measure trace gases in the atmosphere. Their concentration is retrieved by a numerical analysis of the atmospheric absorption spectra, which often are a combination of overlapping absorption structures of several trace gases. A new analysis procedure was developed, modeling atmospheric spectra with the absorp...

A cloud resolving online chemistry transport model was developed based on WRF and has been used to study the transport of trace gases, the scavenging of soluble trace gases, and influences of lightning produced nitrogen oxides (NOx=NO+NO2) on local photochemistry. This presentation mainly focuses on the influence of the retention coefficient (i.e. the fraction of a dissolved trace gas which is ...

The problem concerning the greenhouse effects of human activities has broadened in scope frbm the CO2-climate problem to the trace gas-climate problem. The climate ffects of non-CO 2 trace gases are strongly governed by interactions between chemistry, radiation, and dynamics. We discuss in delfiil the natuie of the trace gas radiative heating and describe the importance of radiative-chemical in...

[1] We have analyzed thirteen years (1993 to 2005) of HALOE and over two years of EOS MLS observations (September 2004 to December 2006) for QBO and annual cycle trace variations in tropical H2O, HCl, ozone, N2O, CO, HF, and CH4. We use these results to develop the theory explaining both Brewer-Dobson circulation (BDC) and QBO driven fluctuations in tropical trace gases. For H2O, BDC variations...

The role of the retention coefficient (i.e. the fraction of a dissolved trace gas which is retained in hydrometeors during freezing) for the scavenging and redistribution of highly soluble trace gases by deep convective cloud systems is investigated using a modified version of the Weather Research and Forecasting (WRF) model. Results from cloud system resolving model runs (in which deep convect...