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Oxygen depletion in lake hypolimnia
Author(s) -
Rippey Brian,
McSorley Catherine
Publication year - 2009
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.2009.54.3.0905
Subject(s) - hypolimnion , eutrophication , trophic level , sediment , oxygen , trophic state index , environmental science , chlorophyll a , phosphorus , hydrology (agriculture) , environmental chemistry , nutrient , ecology , chemistry , geology , biology , geomorphology , botany , geotechnical engineering , organic chemistry
The Livingstone and Imboden (1996) model for the oxygen depletion rate in lake hypolimnia was evaluated with field results in 32 lakes. The volumetric oxygen consumption rate ( J V ) was strongly related to lake trophic state, as represented by the growing season mean chlorophyll a (Chl a ) and annual mean total phosphorus concentration, and might reach a maximum of 0.23‐0.24 g O 2 m −3 d −1 in eutrophic lakes. The areal oxygen consumption rate ( J A ) was not related to trophic state and was lower than the value estimated by the sediment core method, particularly in eutrophic lakes; the mean was 0.0816 6 0.0150 g O 2 m −2 whole sediment d −1 . We modified the model and it was used to confirm that the field J A , the average for the hypolimnion for the deoxygenation period, is influenced by J V and the range of sediment area to water volume ratio, α( Z ) ( Z is water depth), in the hypolimnion, as well as the oxygen consumption rate in whole sediment ( R ). It was suggested that this is the reason for the difference between field and sediment core J A values. The R in 10 lakes varied from 7 to 460 g O 2 m −3 whole sediment d −1 . Overall, the Livingstone and Imboden model with constant J A and with a J V value derived from an empirical relationship with either measure of trophic state was considered to be a suitable condensed model for oxygen depletion in lake hypolimnia.