A lacustrine carbonate record of Holocene seasonality and climate

Citation:
Wittkop, CA, Teranes JL, Dean WE, Guilderson TP.  2009.  A lacustrine carbonate record of Holocene seasonality and climate. Geology. 37:695-698.

Date Published:

Aug

Keywords:

cycle, event, insolation, lake-sediments, level, michigan, system, united-states, usa, variability

Abstract:

Annually laminated (varved) Holocene sediments from Derby Lake, Michigan, display variations in endogenic calcite abundance reflecting a long-term (millennial-scale) decrease in burial punctuated with frequent short-term (decadal-scale) oscillations due to carbonate dissolution. Since 6000 cal yr B. P., sediment carbonate abundance has followed a decreasing trend while organic-carbon abundance has increased. The correlation between organic-carbon abundance and the sum of March-April-October-November insolation has an r(2) value of 0.58. We interpret these trends to represent a precession-driven lengthening of the Holocene growing season that has reduced calcite burial by enhancing net annual organic-matter production and associated calcite dissolution. Correlations with regional paleoclimate records suggest that changes in temperature and moisture balance have impacted the distribution of short-term oscillations in carbonate and organic-matter abundance superimposed on the precession-driven trends.

Notes:

n/a

Website

DOI:

10.1130/g30056a.1