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Tropospheric chemistry: A global perspective
A model for the photochemistry of the global troposphere constrained by observed concentrations of H2O, O3, CO, CH4, NO, NO2, and HNO3 is presented. Data for NO and NO2 are insufficient to define the
Isotopic composition of atmospheric CO2 inferred from carbon in C4 plant cellulose
The isotopic composition of atmospheric carbon dioxide provides an important constraint for models of the global carbon cycle. It is shown that carbon in C4 plants preserves an isotopic record of the
Three-dimensional climatological distribution of tropospheric OH: Update and evaluation
A global climatological distribution of tropospheric OH is computed using observed distributions of O3, H2O, NOt (NO2 +NO + 2N2O5 + NO3 + HNO2 +HNO4), CO, hydrocarbons, temperature, and cloud optical
Regional CO pollution and export in China simulated by the high-resolution nested-grid GEOS-Chem model
Abstract. An updated version of the nested-grid GEOS-Chem model is developed allowing for higher horizontal (0.5°×0.667°) resolution as compared to global models. CO transport over a heavily polluted
Glacial-to-interglacial variations in the carbon isotopic composition of atmospheric CO2
Samples of the C4 shrub Atriplex confertifolia recovered from packrat middens in the western United States provide a record of changes in the 13C/12C ratio (δ13C) of atmospheric carbon dioxide.
Production of NO2- and N2O by Nitrifying Bacteria at Reduced Concentrations of Oxygen
The results support the view that nitrification is an important source of N(2)O in the environment and that nitrite-oxidizing bacteria (Nitrobacter sp.) and the dinoflagellate Exuviaella sp.
Composition and structure of Mars' Upper atmosphere: Results from the neutral mass spectrometers on Viking 1 and 2
The upper atmospheric mass spectrometers flown on Viking 1 and 2 are described, and results obtained for the composition and structure of Mars' upper atmosphere are summarized. Carbon dioxide is the
Reductions of Antarctic ozone due to synergistic interactions of chlorine and bromine
The vertical column density of ozone observed in October over Antarctica has fallen precipitously over the past 10 yr. The concentration at Halley Bay (76° S 27° W), expressed conventionally in
A nested grid formulation for chemical transport over Asia: Applications to CO
[1] A global three-dimensional chemical transport model (GEOS-CHEM) was modified to permit treatment of a limited spatial regime with resolution higher than that adopted for the global background.
Global potential for wind-generated electricity
The analysis indicates that a network of land-based 2.5-megawatt turbines restricted to nonforested, ice-free, nonurban areas operating at as little as 20% of their rated capacity could supply >40 times current worldwide consumption of electricity, >5 times total global use of energy in all forms.