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Relating tropical ocean clouds to moist processes using water vapor isotope measurements
tropical ocean clouds moist water vapor isotope measurements
2011/2/24
We examine the co-variations of tropospheric water vapor, its isotopic composition and cloud types and relate these distributions to tropospheric mixing and distillation models using satellite observa...
Isotope effect in the formation of H2 from H2CO studied at the atmospheric simulation chamber SAPHIR
Isotope effect the formation of H2 from H2CO the atmospheric simulation chamber SAPHIR
2010/8/13
Formaldehyde of known, near-natural isotopic composition was photolyzed in the SAPHIR atmosphere simulation chamber under ambient conditions. The isotopic composition of the product H2 was used to det...
Uptake of HNO3 to deliquescent sea-salt particles: a study using the short-lived radioactive isotope tracer 13N
HNO3 deliquescent sea-salt particles short-lived radioactive isotope tracer 13N
2009/3/12
The uptake of HNO3 to deliquescent airborne sea-salt particles (RH = 55%, P = 760 torr, T = 300 K) at concentrations from 2 to 575 ppbv is measured in an aerosol flow tube using 13N as a tracer. Small...
Wavelength dependence of isotope fractionation in N2O photolysis
Wavelength dependence isotope fractionation N2O photolysis
2009/3/10
In previous reports on isotopic fractionation in the ultraviolet photolysis of nitrous oxide (N2O) only enrichments of heavy isotopes in the remaining N2O fraction have been found. However, most direc...
Kinetic isotope effects in the gas phase reactions of OH and Cl with CH3Cl, CD3Cl, and 13CH3Cl
Kinetic isotope effects gas phase reactions 13CH3Cl
2009/2/17
The kinetic isotope effects in the reactions of CH3Cl, 13CH3Cl and CD3Cl with OH radicals and Cl atoms were studied in relative rate experiments at 298±2 K and 1013±10 mbar. The reactions were carried...
High-precision isotope measurements of H216O, H217O, H218O, and the Δ 17O-anomaly of water vapor in the southern lowermost stratosphere
High-precision isotope measurements water vapor southern lowermost stratosphere
2009/1/14
We report the first high-precision measurements of δ 18O and Δ 17O at high southern latitudes that can resolve changes in the isotopic composition of water vapor in the lowermost stratosphere and uppe...
Constraints on N2O budget changes since pre-industrial time from new firn air and ice core isotope measurements
N2O budget changes pre-industrial time new firn air ice core isotope measurements
2008/12/31
A historical record of changes in the N2O isotope composition is important for a better understanding of the global N2O atmospheric budget. Here we have combined measurements of trapped gases in the f...
Long-term observation of mass-independent oxygen isotope anomaly in stratospheric CO2
mass-independent oxygen isotope anomaly stratospheric CO2
2008/11/24
Stratospheric and upper tropospheric air samples were collected during 1994–2004 over Sanriku, Japan and in 1997 over Kiruna, Sweden. Using these archived air samples, we determined the triple oxygen-...
Hydrogen isotope fractionation in the photolysis of formaldehyde
Hydrogen isotope fractionation in the photolysis of formaldehyde
2008/10/31
Experiments investigating the isotopic fractionation in the formation of H2 by the photolysis of CH2O under tropospheric conditions are reported and discussed. The deuterium (D) depletion in the H2 pr...