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Chemical weathering controls erosion rates in rivers
Chemical weathering controls erosion rates rivers
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2016/4/25
Chemical weathering can control how susceptible bedrock in river beds is to erosion, according to new research. In addition to explaining how climate can influence landscape erosion rates, the r...
Modeling of photolysis rates over Europe: impact on chemical gaseous species and aerosols
photolysis rates Europe chemical gaseous species and aerosols
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2011/2/25
This paper evaluates the impact of photolysis rate calculation on simulated European air composition and air quality. In particular, the impact of the cloud parametrisation and the impact of aerosols ...
Radiative heating rates profiles associated with a springtime case of Bodélé and Sudan dust transport over West Africa
Bodélé and Sudan dust Radiative heating rates West Africa
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2010/9/14
The radiative heating rate due to mineral dust over West Africa is investigated using the radiative code STREAMER, as well as remote sensing and in situ observations gathered during the African Monsoo...
Volume nucleation rates for homogeneous freezing in supercooled water microdroplets: results from a combined experimental and modelling approach
Volume nucleation rates supercooled water microdroplets a combined experimental and modelling approach
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2010/9/1
Temperature-dependent volume nucleation rate coefficients for supercooled water droplets, JV(T), are derived from infrared extinction measurements in a cryogenic laminar aerosol flow tube using a micr...
Vertical transport rates and concentrations of OH and Cl radicals in the Tropical Tropopause Layer from observations of CO2 and halocarbons: implications for distributions of long- and short-lived chemical species
Vertical transport rates OH and Cl radicals the Tropical Tropopause Layer long- and short-lived chemical species
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2010/8/16
Rates for large-scale vertical transport of air in the Tropical Tropopause Layer (TTL) were determined using high-resolution, in situ observations of CO2 concentrations in the tropical upper troposphe...
Enhancement of marine cloud albedo via controlled sea spray injections: a global model study of the influence of emission rates, microphysics and transport
marine cloud albedo emission rates microphysics transport
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2010/8/12
Modification of cloud albedo by controlled emission of sea spray particles into the atmosphere has been suggested as a possible geoengineering option to slow global warming. Previous global studies ha...
Composition and properties of atmospheric particles in the eastern Atlantic and impacts on gas phase uptake rates
atmospheric particles eastern Atlantic gas phase uptake rates
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2009/12/31
Marine aerosol composition continues to represent a large source of uncertainty in the study of climate and atmospheric chemistry. In addition to their physical size and chemical composition, hygrosco...
The effect of nonlinearity in CO2 heating rates on the attribution of stratospheric ozone and temperature changes
CO2 heating rates stratospheric ozone temperature changes
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2009/11/19
An analysis of the attribution of past and future changes in stratospheric ozone and temperature to anthropogenic forcings is presented. The analysis is an extension of the study of Shepherd and Jonss...
Rates and regimes of photochemical ozone production over Central East China in June 2006: a box model analysis using comprehensive measurements of ozone precursors
photochemical ozone Central East China comprehensive measurements ozone precursors
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2009/11/9
An observation-based box model approach was undertaken to estimate concentrations of OH, HO2, and RO2 radicals and the net photochemical production rate of ozone at the top of Mount Tai, located in th...
Observations of high rates of NO2-HONO conversion in the nocturnal atmospheric boundary layer in Kathmandu, Nepal
NO2-HONO conversion nocturnal atmospheric boundary layer Kathmandu Nepal
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2009/9/11
Nitrous acid (HONO) plays a significant role in the atmosphere, especially in the polluted troposphere. Its photolysis after sunrise is an important source of hydroxyl free radicals (OH). Measurements...
Charged and total particle formation and growth rates during EUCAARI 2007 campaign in Hyytiälä
growth rates EUCAARI 2007 campaign Hyytiä lä
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2009/6/23
Despite the fact that frequent aerosol formation has been observed in various locations in the atmosphere, the overall magnitude of the new particle formation as a particle source is still unclear. In...
Uncertainty in global CCN concentrations from uncertain aerosol nucleation and primary emission rates
global CCN concentrations uncertain aerosol nucleation emission rates
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2009/3/13
The indirect effect of aerosols on climate is highly uncertain and limits our ability to assess anthropogenic climate change. The foundation of this uncertainty is uncertainty in the number of cloud c...
Twilight tropospheric and stratospheric photodissociation rates derived from balloon borne radiation measurements
Twilight tropospheric and stratospheric photodissociation rates balloon borne radiation
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2009/3/10
A new ligthweight multichannel moderate bandwidth filter instrument designed to be flown on balloons, is described. The instrument measures the radiation field within the short UV (center wavelength a...
A quantitative analysis of grid-related systematic errors in oxidising capacity and ozone production rates in chemistry transport models
grid-related systematic errors oxidising capacity ozone production rates chemistry transport models
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2009/3/5
Limited resolution in chemistry transport models (CTMs) is necessarily associated with systematic errors in the calculated chemistry, due to the artificial mixing of species on the scale of the model ...
Diurnal and annual variations of meteor rates at the arctic circle
meteor rates arctic circle Diurnal and annual variations
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2009/3/4
Meteors are an important source for (a) the metal atoms of the upper atmosphere metal layers and (b) for condensation nuclei, the existence of which are a prerequisite for the formation of noctilucent...