Comparison of dry deposition velocities for SO2, HNO3 and SO4 2? estimated with two inferential models

1996 ◽  
Vol 87 (1-4) ◽  
pp. 205-218 ◽  
Author(s):  
J. R. Brook ◽  
A. Sirois ◽  
J. F. Clarke
Keyword(s):  
Dry Deposition ◽  
Deposition Velocities

scholarly journals Evaluation and improvements of two community models in simulating dry deposition velocities for peroxyacetyl nitrate (PAN) over a coniferous forest

2012 ◽  
Vol 117 (D4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Zhiyong Wu ◽  
Xuemei Wang ◽  
Andrew A. Turnipseed ◽  
Fei Chen ◽  
Leiming Zhang ◽  
...  
Keyword(s):  
Dry Deposition ◽  
Coniferous Forest ◽  
Peroxyacetyl Nitrate ◽  
Deposition Velocities

scholarly journals Revising global ozone dry deposition estimates based on a new mechanistic parameterisation for air-sea exchange and the multi-year MACC composition reanalysis

2017 ◽  
Author(s):  
Ashok K. Luhar ◽  
Matthew T. Woodhouse ◽  
Ian E. Galbally
Keyword(s):  
Chemical Reaction ◽  
Dry Deposition ◽  
Tropospheric Ozone ◽  
Surface Resistance ◽  
Chemical Reactivity ◽  
Deposition Velocity ◽  
Water Layer ◽  
Turbulent Transfer ◽  
Dominant Term ◽  
Deposition Velocities

Abstract. Dry deposition at the Earth’s surface is an important sink of atmospheric ozone. Currently, dry deposition of ozone to the ocean surface in atmospheric chemistry models has the largest uncertainty compared to deposition to other surface types, with implications for global tropospheric ozone budget and associated radiative forcing. Most models assume that the dominant term of surface resistance in the parameterisation of ozone dry deposition velocity at the oceanic surface is constant. We present a consistent, process-based parameterisation scheme for air-sea exchange in which the surface resistance accounts for the simultaneous waterside processes of ozone solubility, molecular diffusion, turbulent transfer, and a first-order chemical reaction of ozone with dissolved iodide. The new scheme makes the following realistic assumptions: (a) the thickness of the top water layer is of the order of a reaction-diffusion length scale (a few micrometres) within which ozone loss is dominated by chemical reaction and the influence of waterside turbulent transfer is negligible; (b) in the water layer below, both chemical reaction and waterside turbulent transfer act together and are accounted for; and (c) iodide (hence chemical reactivity) is present through the depth of the oceanic mixing layer. The asymptotic behaviour of the new scheme is consistent with the known limits when either chemical reaction or turbulent transfer dominates. It has been incorporated into the ACCESS-UKCA global chemistry-climate model and the results are evaluated against dry deposition velocities from currently best available open-ocean measurements. In order to better quantify the global dry deposition loss and its interannual variability, the modelled 3-h ozone deposition velocities are combined with the 3-h MACC (Monitoring Atmospheric Composition and Climate) reanalysis ozone for the years 2003–2012. The resulting ozone dry deposition is found to be 98.4 ± 4.5 Tg O3 yr−1 for the ocean and 722.8 ± 20.9 O3 yr−1 globally. The new estimate of the ocean component is approximately a third of the current model estimates. This reduction corresponds to an approximately 20 % decrease in the total global ozone dry deposition, which is equivalent to an increase of approximately 5 % in the modelled tropospheric ozone burden and a similar increase in tropospheric ozone lifetime.

scholarly journals Airborne particles in snow

1993 ◽  
Vol 39 (132) ◽  
pp. 239-244
Author(s):  
Jost Heintzenberg ◽  
Markku Rummukainen
Keyword(s):  
Dry Deposition ◽  
Natural Ventilation ◽  
Ice Sheets ◽  
Relative Magnitude ◽  
Airborne Particles ◽  
Crucial Importance ◽  
Deposition Velocities ◽  
Glacier Ice ◽  
Atmospheric Concentrations ◽  
Ventilation Velocity

AbstractIn a pilot experiment, airborne particles were shown to exist in snow. In newly deposited snow they could be traced down to 17 cm below the surface. With our particle sensor, the snow was ventilated on the level of expected natural ventilation velocities. We show with a simple deposition model that air/snow exchange of airborne particles must be considered in the interpretation of impurities in snow and glacier ice. However, the relative magnitude of ventilation velocity compared to dry-deposition velocities at the surface is of crucial importance for determining total deposition. In particular, in ice sheets with high ventilation velocities, seasonal variations in atmospheric concentrations can be dampened and age distributions of deposited particles need to be considered similarly to the occlusion of gases.

VERTICAL CONCENTRATION PROFILES OF FINE AND COARSE AEROSOL PARTICLES OVER A SUBURBAN SAMPLING SITE NEAR BUDAPEST, HUNGARY

1992 ◽  
Vol 02 (02) ◽  
pp. 179-187 ◽  
Author(s):  
S. AMEMIYA ◽  
T. KATOH ◽  
I. BORBÉLY-KISS ◽  
E. KOLTAY ◽  
GY. SZABÓ ◽  
...  
Keyword(s):  
Dry Deposition ◽  
Atmospheric Aerosol ◽  
Aerosol Particles ◽  
Sampling Site ◽  
Enrichment Factors ◽  
Concentration Profiles ◽  
Height Distribution ◽  
Deposition Velocities ◽  
Coarse Aerosol ◽  
Pixe Method

Samples of atmospheric aerosol particles collected at various height over a suburban sampling site were analyzed with respect to 13 elements by PIXE method. Concentrations, enrichment factors, and fine-to-coarse concentration ratios of the fractions were obtained by averaging over height distribution. In one of the sampling experiments dry-deposition velocities were deduced for seven elements from the height distribution.

Biosphere atmosphere exchanges: Ozone and aerosol dry deposition velocities over a pine forest

1994 ◽  
Vol 31-31 (1-2) ◽  
pp. 175-181 ◽  
Author(s):  
E. Lamaux ◽  
A. Labatut ◽  
J. Fontan ◽  
A. Lopez ◽  
A. Druilhet ◽  
...  
Keyword(s):  
Dry Deposition ◽  
Pine Forest ◽  
Deposition Velocities
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