TY - JOUR
T1 - Tracer studies of 14C in the Nordic Seas by AMS measurements
AU - Gislefoss, J. S.
AU - Nydal, R.
AU - Donahue, D. J.
AU - Jull, A. J.T.
AU - Toolin, L. T.
N1 - Funding Information:
The authors are especiallyt hankful to the captains and crews of the researchv esselsL ance, Mosby, G.O. Sam and Johan Hjort. We are also thankful for helpful discussions and assistanceo n board the ships from Johan Blindheim, Institute of Marine ResearchB ergen; Torgny Vinje, The NorwegianP olar ResearchI nstitute and Svein Osterhus,G eophysicalI nstitute, Bergen.W e are especiallyi ndepted to Ingunn Skjelvan,n ow at the Centre for studies of Environment and Resources (GARDEEP), Bergen,f or processingt he CO, samples on board Lance (1990)a nd Mosby (1991).W e thank T. Lange and A.L. Hathewayf or technical assistancein the AMS measurementsT.h e main financial supporti s provided by the Norwegian Research Council for Sci-encesa nd the Humanities (NAVF). The measurements at the Arizona AMS Facility were supportedi n part by a grant (EAR 88-22292)f rom the U.S. National Science Foundation.
PY - 1994/6/3
Y1 - 1994/6/3
N2 - At a time of important interest in climate, the Nordic Seas are especially in focus as a sink for CO2 and the further transfer to the deep water in the Atlantic Ocean. The relatively short time constant in this process provides possibilities to study the circulation by application of tracers. 14C is one of the most representative isotopes in this study, and several deep sea profiles have been obtained in seven summer cruises during the last years. For modelling studies it has been especially important to repeat some GEOSECS profiles obtained 20 years earlier in this area. Some of the first 14C profiles were obtained with conventional CO2 counting technique based on 100-200 l seawater. Most of the later profiles have, however, been measured with the AMS technique at the Arizona AMS facility, based on 0.5 l seawater. The small samples make this technique especially preferable for sample collection on board ship and in further laboratory treatment. The precision in the isotope ratio measurements is generally 6%. for a counting time of 20 min per sample. Higher precision (3-5%.) has, however been achieved with several accelerator targets.
AB - At a time of important interest in climate, the Nordic Seas are especially in focus as a sink for CO2 and the further transfer to the deep water in the Atlantic Ocean. The relatively short time constant in this process provides possibilities to study the circulation by application of tracers. 14C is one of the most representative isotopes in this study, and several deep sea profiles have been obtained in seven summer cruises during the last years. For modelling studies it has been especially important to repeat some GEOSECS profiles obtained 20 years earlier in this area. Some of the first 14C profiles were obtained with conventional CO2 counting technique based on 100-200 l seawater. Most of the later profiles have, however, been measured with the AMS technique at the Arizona AMS facility, based on 0.5 l seawater. The small samples make this technique especially preferable for sample collection on board ship and in further laboratory treatment. The precision in the isotope ratio measurements is generally 6%. for a counting time of 20 min per sample. Higher precision (3-5%.) has, however been achieved with several accelerator targets.
UR - http://www.scopus.com/inward/record.url?scp=38149146107&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=38149146107&partnerID=8YFLogxK
U2 - 10.1016/0168-583X(94)96049-6
DO - 10.1016/0168-583X(94)96049-6
M3 - Article
AN - SCOPUS:38149146107
VL - 92
SP - 431
EP - 435
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
SN - 0168-583X
IS - 1-4
ER -