scholarly journals Observation of daytime N2 O5 in the marine boundary layer during New England Air Quality Study-Intercontinental Transport and Chemical Transformation 2004

2006 ◽  
Vol 111 (D23) ◽  
Author(s):  
Hans D. Osthoff ◽  
Roberto Sommariva ◽  
Tahllee Baynard ◽  
Anders Pettersson ◽  
Eric J. Williams ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Air Quality ◽  
New England ◽  
Chemical Transformation ◽  
Marine Boundary Layer ◽  
Intercontinental Transport ◽  
Quality Study

scholarly journals Shipboard multisensor merged wind profiles from the New England Air Quality Study 2004

2007 ◽  
Vol 112 (D10) ◽  
Author(s):  
D. E. Wolfe ◽  
W. A. Brewer ◽  
S. C. Tucker ◽  
A. B. White ◽  
D. E. White ◽  
...  
Keyword(s):  
Air Quality ◽  
New England ◽  
Quality Study ◽  
Wind Profiles

scholarly journals Radicals in the marine boundary layer during NEAQS 2004: a model study of day-time and night-time sources and sinks

2009 ◽  
Vol 9 (9) ◽  
pp. 3075-3093 ◽  
Author(s):  
R. Sommariva ◽  
H. D. Osthoff ◽  
S. S. Brown ◽  
T. S. Bates ◽  
T. Baynard ◽  
...  
Keyword(s):  
Boundary Layer ◽  
New England ◽  
Gas Phase ◽  
Marine Boundary Layer ◽  
Peroxy Radical ◽  
Chemical Mechanism ◽  
Physical Parameters ◽  
Peroxy Radicals ◽  
Night Time ◽  
Aerosol Composition

Abstract. This paper describes a modelling study of several HOx and NOx species (OH, HO2, organic peroxy radicals, NO3 and N2O5) in the marine boundary layer. A model based upon the Master Chemical Mechanism (MCM) was constrained to observations of chemical and physical parameters made onboard the NOAA ship R/V Brown as part of the New England Air Quality Study (NEAQS) in the summer of 2004. The model was used to calculate [OH] and to determine the composition of the peroxy radical pool. Modelled [NO3] and [N2O5] were compared to in-situ measurements by Cavity Ring-Down Spectroscopy. The comparison showed that the model generally overestimated the measurements by 30–50%, on average. The model results were analyzed with respect to several chemical and physical parameters, including uptake of NO3 and N2O5 on fog droplets and on aerosol, dry deposition of NO3 and N2O5, gas-phase hydrolysis of N2O5 and reactions of NO3 with NMHCs and peroxy radicals. The results suggest that fog, when present, is an important sink for N2O5 via rapid heterogeneous uptake. The comparison between the model and the measurements were consistent with values of the heterogeneous uptake coefficient of N2O5 (γN2O5)>1×10−2, independent of aerosol composition in this marine environment. The analysis of the different loss processes of the nitrate radical showed the important role of the organic peroxy radicals, which accounted for a significant fraction (median: 15%) of NO3 gas-phase removal, particularly in the presence of high concentrations of dimethyl sulphide (DMS).

scholarly journals Analysis of the isoprene chemistry observed during the New England Air Quality Study (NEAQS) 2002 intensive experiment

2006 ◽  
Vol 111 (D23) ◽  
Author(s):  
James M. Roberts ◽  
Mathew Marchewka ◽  
Steven B. Bertman ◽  
Paul Goldan ◽  
William Kuster ◽  
...  
Keyword(s):  
Air Quality ◽  
New England ◽  
Quality Study

scholarly journals Evaluation of urban surface parameterizations in the WRF model using measurements during the Texas Air Quality Study 2006 field campaign

2010 ◽  
Vol 10 (10) ◽  
pp. 25033-25080 ◽  
Author(s):  
S.-H. Lee ◽  
S.-W. Kim ◽  
W. M. Angevine ◽  
L. Bianco ◽  
S. A. McKeen ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Air Quality ◽  
Surface Temperature ◽  
Latent Heat ◽  
Urban Boundary Layer ◽  
Urban Surface ◽  
Urban Vegetation ◽  
Field Campaign ◽  
Quality Study ◽  
Surface Parameterizations

Abstract. The impact of urban surface parameterizations in the WRF (Weather Research and Forecasting) model on the simulation of local meteorological fields is investigated. The Noah land surface model (LSM), a modified LSM, and a single-layer urban canopy model (UCM) have been compared, focusing on urban patches. The model simulations were performed for 6 days from 12 August to 17 August during the Texas Air Quality Study 2006 field campaign. Analysis was focused on the Houston-Galveston metropolitan area. The model simulated temperature, wind, and atmospheric boundary layer (ABL) height were compared with observations from surface meteorological stations (Continuous Ambient Monitoring Stations, CAMS), wind profilers, the NOAA Twin Otter aircraft, and the NOAA Research Vessel Ronald H. Brown. The UCM simulation showed better results in the comparison of ABL height and surface temperature than the LSM simulations, whereas the original LSM overestimated both the surface temperature and ABL height significantly in urban areas. The modified LSM, which activates hydrological processes associated with urban vegetation mainly through transpiration, slightly reduced warm and high biases in surface temperature and ABL height. A comparison of surface energy balance fluxes in an urban area indicated the UCM reproduces a realistic partitioning of sensible heat and latent heat fluxes, consequently improving the simulation of urban boundary layer. However, the LSMs have a higher Bowen ratio than the observation due to significant suppression of latent heat flux. The comparison results suggest that the subgrid heterogeneity by urban vegetation and urban morphological characteristics should be taken into account along with the associated physical parameterizations for accurate simulation of urban boundary layer if the region of interest has a large fraction of vegetation within the urban patch. Model showed significant discrepancies in the specific meteorological conditions when nocturnal low-level jets exist and a thermal internal boundary layer over water forms.

scholarly journals Boundary-Layer and Air Quality Study at “Station Nord” in Greenland

2014 ◽  
pp. 525-529 ◽  
Author(s):  
Ekaterina Batchvarova ◽  
Sven-Erik Gryning ◽  
Henrik Skov ◽  
Lise Lotte Sørensen ◽  
Hristina Kirova ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Air Quality ◽  
Quality Study
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