Record Display for the EPA National Library Catalog
RECORD NUMBER: 11 OF 24
|OLS Field Name||OLS Field Data|
|Main Title||Global distribution of selected halocarbons, hydrocarbons, SF6 and N2O /|
|Author||Singh, Hanwant B. ; Salas, L. J. ; Shigeishi, H. ; Scribner, E.|
|CORP Author||SRI International, Menlo Park, CA.;Environmental Sciences Research Lab., Research Triangle Park, NC.|
|Publisher||Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,|
|Report Number||PB289925; EPA-600/3-78-100; R-8038020-02|
|Stock Number||PB-289 925|
|Subjects||Halocarbons. ; Hydrocarbons. ; Halocarbons. ; Hydrocarbons.|
|Additional Subjects||Halogen organic compounds ; Hydrocarbons ; Sulfur hexafluoride ; Nitrogen oxide(N2O) ; Chemical analysis ; Gas analysis ; Water analysis ; Atmospheric motion ; Concentration(Composition) ; Troposphere ; Sampling ; Trace elements ; Sea water ; Pacific Ocean ; Air pollution ; Water pollution ; Atmospheric chemistry ; Air pollution detection ; Water pollution detection ; Air water interface|
|Collation||73 p. : ill. ; 28 cm.|
Northern and Southern hemispheric distributions of halogenated species, hydrocarbons, SF6, and N2O are presented. The atmospheric growth rates of selected halocarbons and N2O are characterized. The fluorocarbon 11 and 12 global burden and hemispheric distribution is consistent with the view that no significant sinks in the troposphere exist. The north-south gradients of fluorocarbon 11, 12, 113, 114, CCl4, and SF6 suggest rapid global mixing with an interhemispheric exchange rate of about one year. Within each hemisphere, these species are well mixed. N2O shows the least variations around the globe. The global distribution of CH3CCl3 is found to be complex and suggests higher HO levels in the southern hemisphere and around the equator, when compared to the northern hemispheric HO levels. The global distribution of CH3Cl is almost uniform and a significant natural source has been identified in the ocean. It is also shown that large anthropogenic primary or secondary sources of CH3Cl and CCl4 exist. Species such as CHCl3, CH2Cl2, C2HCl3, and C2Cl4 show very large north-south gradients. The atmospheric growth of fluorocarbons 11, 12, CH3CCl3, and CCl4 appear to be consistent with the emissions of these constituents.
"EPA-600/3-78-100." "December 1978." "PB 289 925"--NTIS. Includes bibliographical references (p. 71-72).