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Distribution of greenhouse gases, nitrite, and δ13C of dissolved inorganic carbon in Lake Biwa: Implications for hypolimnetic metabolism

Distribution of greenhouse gases, nitrite, and δ13C of dissolved inorganic carbon in Lake Biwa:... The vertical distribution of dissolved greenhouse gases (CH4,ΣCO2 and N2O), NO $${\text{NO}}_{\text{2}} - $$ ,and δ13C of ΣCO2 in Lake Biwa during a stagnantperiod was precisely determined. ΣCO2 as well as NO $${\text{NO}}_{\text{3}} - $$ was accumulated in the hypolimnion, whereas NO $${\text{NO}}_{\text{2}} - $$ and CH4concen\-trations were generally higher in theepilimnion than in the hypolimnion. In August, NO $${\text{NO}}_{\text{2}} - $$ andCH4 were ephemerally accumulated at the thermocline. Theconcentration of CH4 always exceeded equilibrium with respectto air/water exchange. N2O was rather uniformly distributed inboth time and space, and remained near equilibrium with respect toair/water exchange. All of these observations are similar to otherstratified, oligotrophic lakes, in which the hypolimnia were welloxygenated. The δ13C of ΣCO2 became morenegative with increasing depth, and showed a strong negativecorrelation with apparent oxygen utilization. From the data, the δ13Cvalue of organic matter decomposed into ΣCO2 inthe hypolimnion was calculated by isotope mass-balance, and found tobe in a similar range to δ13C of phytoplankton and benthic algaeand distinctively higher than δ13C of both terrestrial andsedimentary organic matters. This suggests that autochthonous organicmatter was the major source of ΣCO2. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biogeochemistry Springer Journals

Distribution of greenhouse gases, nitrite, and δ13C of dissolved inorganic carbon in Lake Biwa: Implications for hypolimnetic metabolism

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References (63)

Publisher
Springer Journals
Copyright
Copyright © 1997 by Kluwer Academic Publishers
Subject
Earth Sciences; Biogeosciences; Ecosystems; Environmental Chemistry; Life Sciences, general
ISSN
0168-2563
eISSN
1573-515X
DOI
10.1023/A:1005702707183
Publisher site
See Article on Publisher Site

Abstract

The vertical distribution of dissolved greenhouse gases (CH4,ΣCO2 and N2O), NO $${\text{NO}}_{\text{2}} - $$ ,and δ13C of ΣCO2 in Lake Biwa during a stagnantperiod was precisely determined. ΣCO2 as well as NO $${\text{NO}}_{\text{3}} - $$ was accumulated in the hypolimnion, whereas NO $${\text{NO}}_{\text{2}} - $$ and CH4concen\-trations were generally higher in theepilimnion than in the hypolimnion. In August, NO $${\text{NO}}_{\text{2}} - $$ andCH4 were ephemerally accumulated at the thermocline. Theconcentration of CH4 always exceeded equilibrium with respectto air/water exchange. N2O was rather uniformly distributed inboth time and space, and remained near equilibrium with respect toair/water exchange. All of these observations are similar to otherstratified, oligotrophic lakes, in which the hypolimnia were welloxygenated. The δ13C of ΣCO2 became morenegative with increasing depth, and showed a strong negativecorrelation with apparent oxygen utilization. From the data, the δ13Cvalue of organic matter decomposed into ΣCO2 inthe hypolimnion was calculated by isotope mass-balance, and found tobe in a similar range to δ13C of phytoplankton and benthic algaeand distinctively higher than δ13C of both terrestrial andsedimentary organic matters. This suggests that autochthonous organicmatter was the major source of ΣCO2.

Journal

Biogeochemistry – Springer Journals

Published: Sep 18, 2004

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