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Seasonal variations of biogenic and anthropogenic halocarbons in seawater from a coastal site
Author(s) -
Klick Silke
Publication year - 1992
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.1992.37.7.1579
Subject(s) - jetty , bay , seawater , oceanography , environmental science , fucus vesiculosus , seasonality , plankton , phytoplankton , algae , thallus , environmental chemistry , chemistry , ecology , geology , biology , botany , nutrient
Volatile halocarbons were measured weekly throughout 13 months in seawater sampled at a station on the western coast of Sweden. Samples were taken in a macroalgal belt among the submerged thalli of the dominating brown seaweed Fucus vesiculosus and compared to those taken from a nearby jetty that extended into a shallow bay and allowed water sampling at a total depth of 3.5 m. With regard to their seasonality, at least three different groups of halocarbons could be distinguished and suggested different sources. The polybrominated substances CHBr 3 , CH 2 Br 2 , and CHBr 2 Cl showed summer maxima and winter minima, and the concentrations were generally higher in the algal belt, indicating their macroalgal origin. CH 2 I 2 and CH 2 ClI showed distinct concentration maxima in spring and fall that were similar in the algal belt and at the jetty. These substances are most likely produced by planktonic organisms. Finally, airborne contaminants such as CCl 4 occurred at higher concentrations in winter and decreased with increasing water temperature in summer.