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SOSA – a new model to simulate the concentrations of organic vapours and sulphuric acid inside the ABL – Part 1: Model description and initial evaluation
SOSA organic vapours sulphuric acid the ABL initial evaluation
2011/1/18
Chemistry in the atmospheric boundary layer (ABL) is controlled by complex processes of surface fluxes, flow, turbulent transport, and chemical reactions. We present a new model SOSA (model to simulat...
Climate impact on airborne particulate matter concentrations in California using seven year analysis periods
Climate impact airborne particulate matter California seven year analysis periods
2010/11/30
The effect of global climate change on the annual average concentration of fine particulate matter (PM2.5) in California was studied using a climate-air quality modeling system composed of global thro...
Role of aldehyde chemistry and NOx concentrations in secondary organic aerosol formation
aldehyde chemistry NOx concentrations secondary organic aerosol formation
2010/8/16
Aldehydes are an important class of products from atmospheric oxidation of hydrocarbons. Isoprene (2-methyl-1,3-butadiene), the most abundantly emitted atmospheric non-methane hydrocarbon, produces a ...
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
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...
Explaining global surface aerosol number concentrations in terms of primary emissions and particle formation
global surface aerosol number primary emissions particle formation
2010/8/13
We synthesised observations of total particle number (CN) concentration from 36 sites around the world. We found that annual mean CN concentrations are typically 300–2000 cm−3 in the marine boun...
Seasonal variations of concentrations and optical properties of water soluble HULIS collected in urban environments
Seasonal variations water soluble HULIS urban environments
2010/8/12
Major contributors to the organic aerosol include water-soluble macromolecular compounds (e.g. HULISWS: Water Soluble Humic LIke Substances). The nature and sources of HULISWS are still largely unknow...
Fluorescent biological aerosol particle concentrations and size distributions measured with an Ultraviolet Aerodynamic Particle Sizer (UV-APS) in Central Europe
Fluorescent biological aerosol particle concentrations and size distributions an Ultraviolet Aerodynamic Particle Sizer (UV-APS) Central Europe
2010/8/12
Primary Biological Aerosol Particles (PBAPs), including bacteria, spores and pollen, are essential for the spread of organisms and disease in the biosphere, and numerous studies have suggested that th...
Atmospheric gaseous elemental mercury (GEM) concentrations and mercury depositions at a high-altitude mountain peak in south China
Atmospheric gaseous elemental mercury concentrations mercury depositions high-altitude mountain peak
2010/3/16
China is regarded as the largest contributor of mercury (Hg) to the global atmospheric Hg budget. However, concentration levels and depositions of atmospheric Hg in China are poorly known. Continuous ...
Simulation of particle size distribution with a global aerosol model: contribution of nucleation to aerosol and CCN number concentrations
particle size distribution global aerosol model aerosol CCN number concentrations
2009/11/9
An advanced particle microphysics model with a number of computationally efficient schemes has been incorporated into a global chemistry transport model (GEOS-Chem) to simulate particle number size di...
Long-term tropospheric formaldehyde concentrations deduced from ground-based fourier transform solar infrared measurements
Long-term tropospheric formaldehyde concentrations ground-based fourier transform solar infrared measurements
2009/9/27
We report a 13-year (1992–2005) dataset of total column measurements of formaldehyde (HCHO) over Lauder, New Zealand, inferred from solar infrared spectra measured using a high-resolution Fourier Tran...
Increasing surface ozone concentrations in the background atmosphere of Southern China, 1994–2007
Increasing surface ozone concentrations background atmosphere Southern China
2009/9/2
Tropospheric ozone is of great importance with regard to air quality, atmospheric chemistry, and climate change. In this paper we report the first continuous record of surface ozone in the background ...
The relationship between aerosol and cloud drop number concentrations in a global aerosol microphysics model
aerosol cloud drop number concentrations global aerosol microphysics model
2009/6/23
Empirical relationships that link cloud droplet number (CDN) to aerosol number or mass are commonly used to calculate global fields of CDN for climate forcing assessments. In this work we use a sectio...
Validation of urban NO2 concentrations and their diurnal and seasonal variations observed from the SCIAMACHY and OMI sensors using in situ surface measurements in Israeli cities
urban NO2 concentrations SCIAMACHY OMI sensors
2009/6/16
We compare a full-year (2006) record of surface air NO2 concentrations measured in Israeli cities to coinciding retrievals of tropospheric NO2 columns from satellite sensors (SCIAMACHY aboard ENVISAT ...
Sensitivity of aerosol concentrations and cloud properties to nucleation and secondary organic distribution in ECHAM5-HAM global circulation model
aerosol concentrations cloud properties secondary organic distribution ECHAM5-HAM global circulation model
2009/3/13
The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in the boundary layer. Activation-type nucleation mechanism was introduced to produce o...
Uncertainty in global CCN concentrations from uncertain aerosol nucleation and primary emission rates
global CCN concentrations uncertain aerosol nucleation emission rates
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...