The seasonal cycle of inorganic carbon species in Cazenovia Lake, New York, 1977 *

Abstract

Spatial and temporal distiibutions of inorganic carbon and related ionic species (Ca-+ , H') were monitored weekly for 1 year in Cazenovia Lake, a small mesotrophic marl lake. Attendant [H,CO:t]([H,CO;,] + [CO,(aq)]) and CaCO:, equilibtium conditions were determined through application of equilibrium equations adjusted for appropriate temperatures and ionic strength.A seasonal cycle was demonstrated for the inorganic carbon species whieh was temporally correlated to the lake's thermal and productivity cycles. Vertical homogeneity in carbonate chemistry was evident during turnover periods while dramatic differences developed between the epilimnion and hypolimnion during winter and summer stratification. The lake was supersaturated throughout the year with H^CO*, though saturation was approached during the productive summer months in the epilimnion. The epilimnion was supersaturated with respect to CaCO;, from the start of spring turnover to the end of autumn turnover. Calcium (Ca' '') levels within the epilimnion decreased through much of the same period. Dissolution of CaCO:t in the hypolimnion is indicated by increases in Ca^' and alkalinity as stratification periods progress. Analysis of potentially influencing factors indicates that the seasonal trends were mostly a result of COj metabolism. This was further supported by concurrent algal biomass and "C uptake.

The oxygen resources of the hypolimnion of ionically enriched onondaga lake, NY, U.S.A.

“…The variability in the spring and early summer conditions is largely attributable to meterorologically-driven differences in density stratification. anoxia in the hypolimnion) in Onondaga Lake was long by comparison to other lakes in the region of similar dimensions (Effler et al, 1982;Litten et al, 1980;Emer etal., 1985b;Carter 1980). Turnover was observed on April 16, 1981; however, by April 18, 1980 the lake was already well stratified, and anoxia was established in the lowermost layers ( Figure 4).…”

Characterizations of calcite particles and evaluations of their light scattering effects in lacustrine systems

“…The details of the timing of the whiting events appear to be dictated by that of the cyanobacteria serving as heteronuclei. Near seasonal peak T is required (Table ), but this interval and that of enabling bulk oversaturation commonly are wide relative to the duration of the whiting events (Effler et al ; Stabel ; Hodell et al ). Future research of whiting events in lacustrine waters is necessary to further advance the understanding and implications of this phenomenon.…”

“…The importance of the autochthonous population of calcite has been described as biogeochemical, influencing lake chemistry including the cycling of key constituents (Danen-Louwerse et al 1995;Dittrich and Koschel 2002), biological communities such as those of the plankton (Dittrich and Obst 2004), and the sediment record (Hodell et al 1998;Homa and Chapra 2011). The precipitation is active for only a portion of the summer interval of oversaturation of the mineral (Effler et al 1982;Effler 1984), apparently associated with the availability of appropriate heteronuclei (Thompson et al 1997;Dittrich and Obst 2004;Obst et al 2009). Recognition of occurrences of extensive precipitation of calcite has, however, most often been based on visual (optical) effects, from which the "whiting event" expression emerged (Thompson et al 1997).…”

Characterizations of the light-scattering attributes of mineral particles in Lake Ontario and the effects of whiting

“…Often this precipitation occurs only over a portion of the interval of oversaturation, when the degree of oversaturation is high and appropriate nucleation sites are available (Hodell et al, 1998;Homa and Chapra, 2011). The temporal patterns of calcite precipitation events have been linked to increases in temperature or primary production or both (Effler et al, 1982;Hodell et al, 1998;Homa and Chapra, 2011;Strong and Eadie, 1978;Vanderploeg et al, 1987). Picoplankton has been identified as primary nucleation sites (Dittrich and Obst, 2004;Thompson et al, 1997).…”