The delta values of the isotope composition atmospheric ozone is ~100‰ (referenced to O2). Previous photochemical models, which considered fractionation processes from both formation and photolysis ozone, predicted δ49O3 δ50O3 values, in versus space, that are >10‰ larger than measurements. We propose difference between model observations could be explained either by temperature variation, C...

density, viscosity and refractive index of pure, binary and ternary mixtures of diethanolamine (dea) and methyl diethanolamine (mdea) with water have been measured at different temperatures from 288.15 k to 323.15 k at atmospheric pressure. also, this study presents the effects of mixture composition and temperature upon these thermo- physical properties. to measure the density and refractive i...

Introduction: Atmospheric and volatile measurements are crucial to understanding both Mars' climate history and its potential for harboring life. Our present knowledge of the Mars atmosphere comes primarily from the Viking mass spectrometers, gases trapped in the martian meteorites, and from telescopic observations. The Viking landers measured the chemical composition of all major atmospheric s...

During springtime, the Arctic atmospheric boundary layer undergoes frequent rapid depletions in ozone and gaseous elemental mercury due to reactions with halogen atoms, influencing atmospheric composition and pollutant fate. Although bromine chemistry has been shown to initiate ozone depletion events, and it has long been hypothesized that iodine chemistry may contribute, no previous measuremen...

New particle formation and growth has a very important role in many climate processes. However, the overall knowlegde of the chemical composition of atmospheric nucleation mode (particle diameter, d<20 nm) and the lower end of Aitken mode particles (d≤50 nm) is still insufficient. In this work, we have applied the UFO-TDMA (ultrafine organic tandem differential mobility analyzer) method to shed...

Lake sediments provide a record of atmospheric Pb deposition and changes in Pb isotope composition. To our knowledge, such an approach has not previously been performed in The Netherlands or linked to national air monitoring data. Results are presented for Pb content and isotope composition of (137)Cs dated lake sediments from 2 Dutch urban lakes. Between 1942 and 2002A.D. anthropogenic atmosph...

The Craig-Gordon evaporative enrichment model of the hydrogen (deltaD) and oxygen (delta(18)O) isotopes of water was tested in a controlled-environment gas exchange cuvette over a wide range (400 per thousand deltaD and 40 per thousand delta(18)O) of leaf waters. (Throughout this paper we use the term "leaf water" to describe the site of evaporation, which should not be confused with "bulk leaf...

Modern wetlands are the world's strongest methane source. But what was the role of this source in the past? An analysis of global 14C data for basal peat combined with modelling of wetland succession allowed us to reconstruct the dynamics of global wetland methane emission through time. These data show that the rise of atmospheric methane concentrations during the Pleistocene-Holocene transitio...

Fine aerosol bulk composition measured on WP-3D research aircraft in vicinity of the Northeastern United States – results from NEAQS R. E. Peltier, A. P. Sullivan, R. J. Weber, C. A. Brock, A. G. Wollny, J. S. Holloway, J. A. de Gouw, and C. Warneke School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA National Oceanic and Atmospheric Administration, Earth S...