Distribution of helium and tritium in Lake Baikal

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HOHMANN, Roland, Markus HOFER, Rolf KIPFER, Frank PEETERS, Dieter M. IMBODEN, 1998. Distribution of helium and tritium in Lake Baikal. In: Journal of Geophysical Research. 103(C6), pp. 12, 823-12, 838. ISSN 0148-0227

@article{Hohmann1998Distr-6620, title={Distribution of helium and tritium in Lake Baikal}, year={1998}, doi={10.1029/97JC02218}, number={C6}, volume={103}, issn={0148-0227}, journal={Journal of Geophysical Research}, pages={12, 823--12, 838}, author={Hohmann, Roland and Hofer, Markus and Kipfer, Rolf and Peeters, Frank and Imboden, Dieter M.} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/6620"> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:27:50Z</dcterms:available> <dcterms:issued>1998</dcterms:issued> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:27:50Z</dc:date> <dc:contributor>Kipfer, Rolf</dc:contributor> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/6620"/> <dc:contributor>Peeters, Frank</dc:contributor> <dc:creator>Peeters, Frank</dc:creator> <dcterms:title>Distribution of helium and tritium in Lake Baikal</dcterms:title> <dc:creator>Kipfer, Rolf</dc:creator> <dcterms:bibliographicCitation>First publ. in: Journal of Geophysical Research 103 (1998), C6, pp. 12,823-12,838</dcterms:bibliographicCitation> <dc:language>eng</dc:language> <dc:creator>Hohmann, Roland</dc:creator> <dc:creator>Hofer, Markus</dc:creator> <dc:rights>deposit-license</dc:rights> <dc:contributor>Hohmann, Roland</dc:contributor> <dc:format>application/pdf</dc:format> <dc:contributor>Hofer, Markus</dc:contributor> <dc:contributor>Imboden, Dieter M.</dc:contributor> <dcterms:rights rdf:resource="https://creativecommons.org/licenses/by-nc-nd/2.0/legalcode"/> <dcterms:abstract xml:lang="eng">The 3H-3He age of a water mass is a measure of the time that has passed since the water mass was last in contact with the atmosphere. Between 1992 and 1995 a detailed study of3H-3He ages was conducted in Lake Baikal, the deepest and largest lake by volume on Earth, to investigate deep water renewal in its three major basins. Maximum 3H-3He ages are 14-17 years in the southern basin, 16-18 years in the central basin, and 10-11 years in the northern basin. Rates of renewal of deep water with surface water, deduced from volume-weighted mean3 H-3He ages below 250 m depth, are about 10% yr-l in the southern and central basins and 15% yr-l in the northern basin. In the southern basin the mean 3H-3He age below 250 m depth increased steadily from 9.6 years in 1992 to 11 years in 1995, indicating a slight diminution in deep water renewal during this time. Bottom water renewal by largescale advection was estimated from the mass balance of 3He in the 200 m thick bottom layer of each basin. Bottom water renewal rates in the northern basin were found to be between 80 and 150 km3 yr-l and in the central basin between 10 and 20 km3 yrl, whereas in the southern basin they were practically zero. Correlating oxygen and dissolved helium-4 concentrations with 3H-3He age aallowed us to determine the mean hypolimnetic oxygen depletion rate in the water column (4.5 nanomol L -1 yr-l), as well as mean helium fluxes from the lake bottom (2.8 x 1011 atoms m-2 s-l in the northern basin, and 1.3 x 10 11 atoms m-2 s-l in the central and southern basins). The helium isotope ratio of the terrigenic helium component injected from the lake bottom, determined from measurements of water from hydrothermal s rings in the vicinity of the lake, was found to be ~2.2xl0-7.</dcterms:abstract> <dc:creator>Imboden, Dieter M.</dc:creator> </rdf:Description> </rdf:RDF>

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