caa a22 4500 477061389 CHVBK 20180405111401.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00053287 doi (NATIONALLICENCE)springer-10.1007/BF00053287 Cooper David Atmospheric and Oceanic Sciences, University of Wisconsin, 1225 W. Dayton St., 53706, Madison, WI, U.S.A. aut Estimation of hydroxyl radical concentrations in the marine atmospheric boundary layer using a reactive atmospheric tracer [Elektronische Daten] [David Cooper] Hydroxyl radical (OH) concentrations in the atmospheric boundary layer over a number of remote ocean locations are calculated from the measured diurnal variation in atmospheric dimethylsulfide (DMS). By using averaged DMS data sets from extended periods, the calculation yields OH concentrations averaged over periods from several days to weeks. These average OH concentrations range from 7×105 to 2.9×106 molecules cm-3, corresponding to midday maxima of 3 to 12×106 molecules cm-3. The lowest values correspond to studies with the lowest light intensity (Antarctic summer and South Atlantic winter), and the highest values to regions with probable anthropogenic influence. In addition to the long term averages, daily average OH levels can be calculated for most days in a two week period from a cruise in the tropical eastern Pacific. These calculations are in good argeement with global average OH levels derived from other tracers, and are consistent with model OH calculations when allowance is made for variation in ambient ozone levels between the studies. Estimates of gas exchange made from the diurnal variation of DMS suggest that either the gas exchange coefficient of DMS or the boundary layer mixing depth may have been overestimated in past analyses. Kluwer Academic Publishers, 1996 hydroxyl radical nationallicence marine boundary layer nationallicence atmospheric tracer nationallicence dimethylsulfide nationallicence sea-air exchange nationallicence Journal of Atmospheric Chemistry Kluwer Academic Publishers; http://gopger://gopher.wkap.nl 25/1(1996-09-01), 97-113 0167-7764 25:1<97 1996 25 10874 https://doi.org/10.1007/BF00053287 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00053287 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Cooper David Atmospheric and Oceanic Sciences, University of Wisconsin, 1225 W. Dayton St., 53706, Madison, WI, U.S.A aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers; http://gopger://gopher.wkap.nl/ 25/1(1996-09-01), 97-113 0167-7764 25:1<97 1996 25 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer