Factors explaining the yearly changes in minimum bottom dissolved oxygen concentrations in Lake Biwa, a warm monomictic lake.

ABSTRACT: Vertical profiles of dissolved oxygen (DO) and water temperature (WT) measured bi-monthly for 36 years (1980-2015) near the deepest part of a warm monomictic lake were analyzed with special reference to yearly minimum DO at bottom (DOmin). DOmin changed yearly (3.0 ± 1.2 mg l^-1) and significant differences in DOmin were not observed between Period I (1980-1993; cooler and worse in water quality) and Period II (1994-2015; warmer and better in water quality). This unclear trend in DOmin was probably due to the offsetting influences between warming induced by global warming and oligotrophication attempted by local governments etc. for the study period. DOmin was positively correlated with disturbance time (timing of last cold water intrusion observed from Mar to Aug), which could b

SUBMITTER: Fukushima T 

PROVIDER: S-EPMC6342936 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature