Zobrazeno 1 - 10
of 68
pro vyhledávání: '"David P. Chock"'
Publikováno v:
Atmospheric Environment. 39:4015-4023
Eulerian-based air quality models encounter a serious numerical problem in solving the advection equation. In addition, mass conservation is often violated when meteorological model output is used as input to air quality models. The Trajectory-Grid a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ecf731d5aa09d7e52700a3d2d626e9ae
https://doi.org/10.1016/j.atmosenv.2005.03.037
https://doi.org/10.1016/j.atmosenv.2005.03.037
Publikováno v:
Atmospheric Environment. 37:3303-3316
Condensation of gases (H2SO4, NH3, HNO3, low vapor pressure organics, etc.) onto existing aerosols can account for a significant portion of fine particulate matter. Since aerosols affect human health, visibility, and climate change, it is important t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b48451adf8fe11a03ed824bc06c02c18
https://doi.org/10.1016/s1352-2310(03)00267-x
https://doi.org/10.1016/s1352-2310(03)00267-x
Publikováno v:
Atmospheric Environment. 36:4649-4662
We have introduced a new and elaborate approach to understand the impact of grid resolution and subgrid chemistry assumption on the grid-model prediction of species concentrations for a system with highly non-homogeneous chemistry—a reactive buoyan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0cf44f6adc179502ac899ab0acefd1fa
https://doi.org/10.1016/s1352-2310(02)00422-3
https://doi.org/10.1016/s1352-2310(02)00422-3
Autor:
Sandra L. Winkler, David P. Chock
Publikováno v:
Atmospheric Environment. 34:2957-2973
The trajectory-grid method (Chock et al., Atmospheric Environment 30 (1996) 857–868) for solving the transport equation in a grid model can be easily adapted to solve the condensation/evaporation equations of internally mixed multicomponent aerosol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f9f46005e52194a7d16b66607e951f79
https://doi.org/10.1016/s1352-2310(00)00069-8
https://doi.org/10.1016/s1352-2310(00)00069-8
Publikováno v:
Atmospheric Environment. 33:2471-2485
The new National Ambient Air Quality Standard for ozone in the US uses 8 h averaging for the concentration. Based on the 1993 ambient data for Southern California, 8 h averaging has a moderate tendency to move the location of the peak ozone concentra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88e773d359d111743e19991783ca3c4a
https://doi.org/10.1016/s1352-2310(98)00381-1
https://doi.org/10.1016/s1352-2310(98)00381-1
Publikováno v:
Environmental Health Perspectives
Confounding between the model covariates and causal variables (which may or may not be included as model covariates) is a well-known problem in regression models used in air pollution epidemiology. This problem is usually acknowledged but hardly ever
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d9df93e4ec69c2f6501f790fcd2a7e9
https://doi.org/10.1289/ehp.99107217
https://doi.org/10.1289/ehp.99107217
Publikováno v:
Atmospheric Environment. 31:2787-2794
Interest in semiempirical approaches for relating precursor emissions (VOC and NOx to ozone air quality has been renewed recently. Of particular interest is a semi-empirical approach [called Smog Production Model (SPM) or SP Algorithm] initiated by J
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd03158dadcaabae92182b213901b069
https://doi.org/10.1016/s1352-2310(97)00086-1
https://doi.org/10.1016/s1352-2310(97)00086-1
Autor:
Sandra L. Winkler, David P. Chock
Publikováno v:
Environmental Science & Technology. 31:359-370
A model with a varying layer-depth structure tends to have excessive vertical diffusion but can accommodate a well-defined mixing height. It also requires a modified vertical wind field to minimize possible local accumulation or drainage of species m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e082d0d51bb01ac2b3cef0985b76992f
https://doi.org/10.1021/es9601292
https://doi.org/10.1021/es9601292
Autor:
Sandra L. Winkler, David P. Chock
Publikováno v:
Environmental Science & Technology. 30:1163-1175
We have carried out an extensive study on the effect of replacing the advection and chemistry algorithms of the Urban Airshed Model (UAM) with more accurate algorithms, using the SCAQS episode of August 26−28, 1987, and input data supplied by the C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89eecf18f7dd7abe61e349434171934a
https://doi.org/10.1021/es950403c
https://doi.org/10.1021/es950403c
Publikováno v:
Atmospheric Environment. 30:857-868
We propose a new method, called the trajectory-grid (T-G) approach, which contains a fully Lagrangian advection scheme coupled with an Eulerian diffusion scheme, to remove the numerical problems associated with the advection equation in air quality m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b8dfdcf854d85580910c7adeb223454f
https://doi.org/10.1016/1352-2310(95)00332-0
https://doi.org/10.1016/1352-2310(95)00332-0