Distribution of helium and tritium in Lake Baikal

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1998
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Hohmann, Roland
Hofer, Markus
Kipfer, Rolf
Imboden, Dieter M.
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Journal of Geophysical Research. 1998, 103(C6), pp. 12, 823-12, 838. ISSN 0148-0227. Available under: doi: 10.1029/97JC02218
Zusammenfassung

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.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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helium, tritium, Lake Baikal, deep water, surface water
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undefined / . - undefined, undefined
Zitieren
ISO 690HOHMANN, Roland, Markus HOFER, Rolf KIPFER, Frank PEETERS, Dieter M. IMBODEN, 1998. Distribution of helium and tritium in Lake Baikal. In: Journal of Geophysical Research. 1998, 103(C6), pp. 12, 823-12, 838. ISSN 0148-0227. Available under: doi: 10.1029/97JC02218
BibTex
@article{Hohmann1998Distr-6620,
  year={1998},
  doi={10.1029/97JC02218},
  title={Distribution of helium and tritium in Lake Baikal},
  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.}
}
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