The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7

Integrated monthly wet-only and bulk precipitation samples for Be-7 and Pb-210 analysis were collected from November 1982 through October 1983 at two sites in lower Chesapeake Bay. Atmospheric deposition fluxes for Be-7 in wet-only and bulk precipitation averaged 0.013 and 0.014 pCi/cm2/d, respectiv...

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Main Author: Todd, James Forrest
Format: Text
Language:unknown
Published: ODU Digital Commons 1984
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Online Access:https://digitalcommons.odu.edu/oeas_etds/159
https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1159&context=oeas_etds
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spelling ftolddominionuni:oai:digitalcommons.odu.edu:oeas_etds-1159 2023-05-15T17:54:03+02:00 The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7 Todd, James Forrest 1984-04-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_etds/159 https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1159&context=oeas_etds unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_etds/159 https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1159&context=oeas_etds In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). OES Theses and Dissertations Geochemistry text 1984 ftolddominionuni 2023-01-16T18:44:52Z Integrated monthly wet-only and bulk precipitation samples for Be-7 and Pb-210 analysis were collected from November 1982 through October 1983 at two sites in lower Chesapeake Bay. Atmospheric deposition fluxes for Be-7 in wet-only and bulk precipitation averaged 0.013 and 0.014 pCi/cm2/d, respectively, and for Pb-210 averaged 0.36 and 0.40 pCi/cm2/yr, respectively, suggesting that dry deposition makes only a minor contribution to the total fluxes. A seasonal trend was observed in the depositional flux of Be-7, with a pronounced maximum in the Spring. Approximately 40 percent of the annual Be-7 deposition occurred between February and April, with a maximum in March. This is consistent with the injection of Be-7 of statospheric origin into the tropopause during the vernal tropopause break. Pb-210 exhibited a slightly weaker seasonal trend, with ca. 35 percent delivered between February and April, which appears to be related to the rate at which its parent, Rn-222, emanates from the earth. The average deposition velocities for Be-7 and Pb-210 in bulk precipitation were 1.5 and 0.8 cm/s, respectively. The removal behaviors of two atmospherically-derived radionuclides, Pb-210 and Be-7, have been examined in real-time following their deposition to a shallow coastal bay by four precipitation events. In general, there was a marked elevation in the water column concentrations following a precipitation event and the concentrations decreased with time. The removal residence times of these radionuclides were on the order of several days. Po-210 exhibited similar behavior. Since the atmospheric flux of Po-210 is small, the elevated concentrations of Po-210 following a precipitation event may result from the mobilization of Po-210, in the dissolved form, from sediments. Vertical profiles of dissolved Po-210, Pb-210, and Ra-226 were obtained from the Orca Basin, an anoxic, hypersaline and yet non-sulfide bearing basin. At the seawater-brine interface at 2230 m, a sharp maximum was observed in the profiles of Po-210 and ... Text Orca Old Dominion University: ODU Digital Commons
institution Open Polar
collection Old Dominion University: ODU Digital Commons
op_collection_id ftolddominionuni
language unknown
topic Geochemistry
spellingShingle Geochemistry
Todd, James Forrest
The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
topic_facet Geochemistry
description Integrated monthly wet-only and bulk precipitation samples for Be-7 and Pb-210 analysis were collected from November 1982 through October 1983 at two sites in lower Chesapeake Bay. Atmospheric deposition fluxes for Be-7 in wet-only and bulk precipitation averaged 0.013 and 0.014 pCi/cm2/d, respectively, and for Pb-210 averaged 0.36 and 0.40 pCi/cm2/yr, respectively, suggesting that dry deposition makes only a minor contribution to the total fluxes. A seasonal trend was observed in the depositional flux of Be-7, with a pronounced maximum in the Spring. Approximately 40 percent of the annual Be-7 deposition occurred between February and April, with a maximum in March. This is consistent with the injection of Be-7 of statospheric origin into the tropopause during the vernal tropopause break. Pb-210 exhibited a slightly weaker seasonal trend, with ca. 35 percent delivered between February and April, which appears to be related to the rate at which its parent, Rn-222, emanates from the earth. The average deposition velocities for Be-7 and Pb-210 in bulk precipitation were 1.5 and 0.8 cm/s, respectively. The removal behaviors of two atmospherically-derived radionuclides, Pb-210 and Be-7, have been examined in real-time following their deposition to a shallow coastal bay by four precipitation events. In general, there was a marked elevation in the water column concentrations following a precipitation event and the concentrations decreased with time. The removal residence times of these radionuclides were on the order of several days. Po-210 exhibited similar behavior. Since the atmospheric flux of Po-210 is small, the elevated concentrations of Po-210 following a precipitation event may result from the mobilization of Po-210, in the dissolved form, from sediments. Vertical profiles of dissolved Po-210, Pb-210, and Ra-226 were obtained from the Orca Basin, an anoxic, hypersaline and yet non-sulfide bearing basin. At the seawater-brine interface at 2230 m, a sharp maximum was observed in the profiles of Po-210 and ...
format Text
author Todd, James Forrest
author_facet Todd, James Forrest
author_sort Todd, James Forrest
title The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
title_short The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
title_full The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
title_fullStr The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
title_full_unstemmed The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
title_sort aquatic geochemistry of the particle-reactive radionuclides po-210, pb-210, and be-7
publisher ODU Digital Commons
publishDate 1984
url https://digitalcommons.odu.edu/oeas_etds/159
https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1159&context=oeas_etds
genre Orca
genre_facet Orca
op_source OES Theses and Dissertations
op_relation https://digitalcommons.odu.edu/oeas_etds/159
https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1159&context=oeas_etds
op_rights In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
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