Atmospheric Environment (1967)最新文献_第9页

Parameterization of surface resistances to gaseous dry deposition in regional-scale numerical models 区域尺度数值模式中气相干沉积表面阻力的参数化

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90153-4

M.L. Wesely

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引用次数: 0

Recent titles of interest 最近感兴趣的标题

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90274-6

引用次数: 0

Recent titles of interest 最近感兴趣的标题

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90541-6

引用次数: 0

The preparation of papers for Atmospheric environment 大气环境论文的制备

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90141-8

引用次数: 0

Major factors influencing gas-phase chemistry in power plant plumes during long range transport—II. Release time and dispersion rate for dispersion into an ‘urban’ ambient atmosphere 远程输送过程中影响电厂羽流气相化学的主要因素ⅱ。进入“城市”环境大气的释放时间和扩散速率

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90561-1

Alan T. Cocks, Ian S. Fletcher

{"title":"Major factors influencing gas-phase chemistry in power plant plumes during long range transport—II. Release time and dispersion rate for dispersion into an ‘urban’ ambient atmosphere","authors":"Alan T. Cocks, Ian S. Fletcher","doi":"10.1016/0004-6981(89)90561-1","DOIUrl":"https://doi.org/10.1016/0004-6981(89)90561-1","url":null,"abstract":"<div>A gas-phase chemical kinetic scheme combined with a simple dispersion model has been used to examine the influence of season, time of release, and dispersion rate on the chemical behaviour of a power-plant plume emitted into an ambient atmosphere defined by urban emissions. Simulations were carried out over 24 h for a plume trajectory primarily over the sea at a typical Northern European latitude.The temporal behaviour of in-plume OH radical concentrations is a complex function of the parameters studied. For daytime releases, mean OH concentrations over 24 h are predicted to be lower than the ambient values. For evening and night releases, mean OH concentrations are calculated to be greater than the corresponding ambient values for rapidly dispersing plumes.Mean effective first-order rate constants for the gas-phase oxidation of plume SO2 are estimated to be ca 0.4% h−1, 0.2% h−1 and 0.02% h−1, for summer, autumn/spring, and winter, respectively, and are lower than the mean values calculated for the ambient troposphere.Ozone, H2O2 and PAN concentrations in power plant plumes are normally predicted to be less than the corresponding ambient values over most of the simulation period. A significant ozone excess in plumes is only expected for slowly dispersing plumes under summer conditions after 24 h.Most of the plume and ambient NOx is predicted to be converted to HNO3 in summer and autumn/spring within 24 h and concentrations of HNO3 are predicted to greatly exceed those of H2SO4.These results are compared with those obtained previously for simulations of dispersion into a ‘rural’ ambient atmosphere.</div>","PeriodicalId":100138,"journal":{"name":"Atmospheric Environment (1967)","volume":"23 12","pages":"Pages 2801-2812"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0004-6981(89)90561-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137229260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Authors' reply 作者的回复

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90422-8

Vincent A. Dutkiewicz , Llaquat Husain

引用次数: 0

Mass budget studies of photochemical ozone production over the U.K. 英国光化学臭氧生产的大规模预算研究

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90158-3

K.J. Weston, P.J.A. Kay, D. Fowler, A. Martin, J.S. Bower

{"title":"Mass budget studies of photochemical ozone production over the U.K.","authors":"K.J. Weston, P.J.A. Kay, D. Fowler, A. Martin, J.S. Bower","doi":"10.1016/0004-6981(89)90158-3","DOIUrl":"10.1016/0004-6981(89)90158-3","url":null,"abstract":"<div>During late April 1987 an ozone episode occurred during which mid-afternoon hourly O3concentrations reached between 80 and 100 ppbV at many sites in the U.K. during a 5-day period. Such an occurrence is exceptional for April. Data from the recently-established U.K. network of O3-monitoring stations is used to estimate O3concentrations in the mixed layer of the lower troposphere as air moves across the U.K. Detailed analyses of individual episode days have enabled estimates to be made of the contribution of ‘local’ photochemical O3production to the observed concentrations at various U.K. sites.Ozone budgets are derived by following air columns between well-mixed phases on successive days along trajectories, which take into account their variation with height. Surface deposition is estimated using a diurnally-varying deposition velocity and observed O3concentrations along the trajectory. Net photochemical production is deduced as a residual, knowing O3concentrations at the end points of the trajectory.The results from 10 budget calculations show a clear relationship between the apparent generation of O3in the mixed layer and the sunshine experienced along the respective trajectory. A net O3generation of about 4 ppbV h −1 of bright sunshine is indicated, implying maximum daily generations of about 45 ppbV in April and about 60 ppbV in mid-summer under similar conditions.</div>","PeriodicalId":100138,"journal":{"name":"Atmospheric Environment (1967)","volume":"23 6","pages":"Pages 1349-1360"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0004-6981(89)90158-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52834099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Particulate emissions from ‘in-use’ motor vehicles—II. Diesel vehicles “使用中”机动车辆的微粒排放——ii。柴油汽车

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90545-3

D.J. Williams, J.W. Milne, S.M. Quigley, D.B. Roberts, M.C. Kimberlee

{"title":"Particulate emissions from ‘in-use’ motor vehicles—II. Diesel vehicles","authors":"D.J. Williams, J.W. Milne, S.M. Quigley, D.B. Roberts, M.C. Kimberlee","doi":"10.1016/0004-6981(89)90545-3","DOIUrl":"10.1016/0004-6981(89)90545-3","url":null,"abstract":"<div>A detailed study has been undertaken of the exhaust particulate matter (EPM) emitted by 19 light-duty and 13 heavy-duty diesel vehicles. Eighteen of the light-duty vehicles were of the indirect injection types, whereas the heavy-duty ones were all four stroke. The light-duty vehicles were tested under a standard city drive cycle, the heavy-duty vehicles being subjected to a multi-mode test cycle. Although considerable variability was found in emission rates between individual vehicles of the same make and model, light-duty diesel vehicles emitted 3–6 g EPM kg−1 of fuel consumed, which was six times as much as spark ignition (S.I.) vehicles. The heavy-duty diesel vehicles emitted most EPM, giving rise to >6.6g EPM kg−1 on average. For both classes of diesel vehicles, higher EPM rates were generally associated with higher CO emission rates. Light-duty diesel EPM was found to consist mostly of C, two-thirds of which was in the ‘sooty’ or elemental (EC) form with the remainder organic (OC). The heavy-duty diesel EPM contained a higher proportion of OC than that from the light-duty diesels. Tests carried out with 13C-labelled lubricating oil indicated a significant oil contribution to EPM from diesel vehicles. In addition to measuring variations in EPM emission rates between different diesel vehicles, the influences of fuel supply, injection timing and fuel quality were also studied, using a light-duty indirect injection engine. Injection timing was found to have the greatest influence, with EPM emissions decreasing on retardation. The influence of injection timing was also assessed using a direct injection vehicle.</div>","PeriodicalId":100138,"journal":{"name":"Atmospheric Environment (1967)","volume":"23 12","pages":"Pages 2647-2661"},"PeriodicalIF":0.0,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0004-6981(89)90545-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52836434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 48

Semi-quantitative X-ray diffraction analysis of size fractionated atmospheric particles 大气颗粒尺寸分馏的半定量x射线衍射分析

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90196-0

Briant L. Davis

引用次数: 7

Volcanism and nuclear winter 火山活动和核冬天

Atmospheric Environment (1967) Pub Date : 1989-01-01 DOI: 10.1016/0004-6981(89)90207-2

Sherwood B. Idso

引用次数: 1