caa a22 4500 475823222 CHVBK 20180406123824.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1023/A:1006383030362 doi (NATIONALLICENCE)springer-10.1023/A:1006383030362 Factors Influencing the Atmospheric Depositional Fluxes of Stable Pb, 210Pb, and 7Be into Chesapeake Bay [Elektronische Daten] [Guebuem Kim, N. Hussain, J. Scudlark, T. Church] Atmospheric depositional fluxes of 7Be and210Pb (bulk) and stable Pb (wet) were measuredsimultaneously for one year (from September 1995-August 1996) atStillpond, Maryland on the uppereastern shore of the Chesapeake Bay. The annual total(bulk) depositional fluxes of 210Pb and 7Bewere 0.78 and 13 dpm cm-2, respectively, andagree well with other previously reported results atnearby locations such as Norfolk, VA and Lewes, DE. The wet depositional flux of stable Pb (58 ng cm-2 yr-1)was also similar to thatmeasured at other Chesapeake sites during 1990-1991(55 ng cm-2 yr-1, for both Wye and Elms,Maryland). This suggests that a constant Pb flux hasbeen reached since the mandatory use of unleadedgasoline was instituted. The concentrations of7Be, 210Pb, and to a lesser extent stable Pbwere diluted exponentially by precipitation, based onconcentrations versus precipitation plots. Due tohigher enrichment of 210Pb in the lowertroposphere, the dilution effect was largest on210Pb (i.e., controlled mainly by below-cloudscavenging processes), and thus its depositional fluxincrease is negligible as precipitation amountincreases. A good correlation between the amount ofprecipitation and total depositional flux of 7Beand stable Pb, which are more enriched in the uppertroposphere, suggests that precipitation amount isimportant in controlling their fluxes (i.e.,controlled by both below-cloud scavenging and in-cloudcondensation processes). Based on 7Be versus210Pb plots, it appears that 7Be, relativeto 210Pb, is less efficiently scavenged bysnowfall. Our results suggest that in addition toprecipitation amounts, marine air-mass transport orsnowfall may be important factors in controlling theseasonal variability of the fallout fluxes of tracemetals in coastal areas. Kluwer Academic Publishers, 2000 lead nationallicence pollution nationallicence mid-Atlantic bight nationallicence radionuclide nationallicence air mass nationallicence Kim Guebuem Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A. aut Hussain N. Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A. aut Scudlark J. Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A. aut Church T. Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A. aut Journal of Atmospheric Chemistry Kluwer Academic Publishers 36/1(2000-05-01), 65-79 0167-7764 36:1<65 2000 36 10874 https://doi.org/10.1023/A:1006383030362 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1006383030362 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Guebuem Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A aut NATIONALLICENCE 700 1- Hussain N. Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A aut NATIONALLICENCE 700 1- Scudlark J. Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A aut NATIONALLICENCE 700 1- Church T. Graduate College of Marine Studies, University of Delaware, 19716, Newark, DE, U.S.A aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers 36/1(2000-05-01), 65-79 0167-7764 36:1<65 2000 36 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer