JacquesCummingSmol2009

Référence

St-Jacques, J.-M., Cumming, B.F., Smol, J.P. (2009) A 900-yr diatom and chrysophyte record of spring mixing and summer stratification from varved Lake Mina, west-central Minnesota, USA. Holocene, 19(4):537-547.

Résumé

A high-resolution, independent pollen-inferred paleoclimate record and direct algal seasonality data from the actual time of sediment deposition are used to interpret the high-resolution diatom and chrysophyte record of varved Lake Mina, west-central Minnesota, USA during AD 1116ĝ€"2002. This direct algal seasonality information was obtained by splitting varves into constituent winter-spring and summer lamina, and separately analyzing the siliceous algae in each layer. Analyses of integrated, continuous four-year diatom and chrysophyte samples from a sedimentary sequence show that the time period AD 1116ĝ€"1478 (ie, the Atlantic-centered 'Medieval Climate Anomaly' (MCA)) was characterized by periods of vigorous and prolonged spring mixing, suggesting that ice-out occurred early. However, the warm summer temperatures in the MCA, particularly in a massive drought spanning AD 1300ĝ€"1400, frequently caused the lake to stratify strongly, leading to nutrient depletion. During AD 1478ĝ€"1870 (ie, the Atlantic-centered 'Little Ice Age' (LIA)), Lake Mina was characterized by weak spring circulation and increasing nutrient depletion, suggesting late ice-out conditions. Strong summer stratification and/or nutrient depletion in both time periods is shown by the occurrence of the nutrient-poor oligotrophic taxon Cyclotella pseudostelligera. The diatom and chrysophyte assemblages of the period of Euro-American settlement AD 1870ĝ€"2002 show higher nutrient availability and increased spring mixing intensity, as a result of forest clearance and increasingly earlier ice-out (documented in regional historical records).

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@ARTICLE { JacquesCummingSmol2009,
    AUTHOR = { St-Jacques, J.-M. and Cumming, B.F. and Smol, J.P. },
    TITLE = { A 900-yr diatom and chrysophyte record of spring mixing and summer stratification from varved Lake Mina, west-central Minnesota, USA },
    JOURNAL = { Holocene },
    YEAR = { 2009 },
    VOLUME = { 19 },
    NUMBER = { 4 },
    PAGES = { 537-547 },
    ABSTRACT = { A high-resolution, independent pollen-inferred paleoclimate record and direct algal seasonality data from the actual time of sediment deposition are used to interpret the high-resolution diatom and chrysophyte record of varved Lake Mina, west-central Minnesota, USA during AD 1116ĝ€"2002. This direct algal seasonality information was obtained by splitting varves into constituent winter-spring and summer lamina, and separately analyzing the siliceous algae in each layer. Analyses of integrated, continuous four-year diatom and chrysophyte samples from a sedimentary sequence show that the time period AD 1116ĝ€"1478 (ie, the Atlantic-centered 'Medieval Climate Anomaly' (MCA)) was characterized by periods of vigorous and prolonged spring mixing, suggesting that ice-out occurred early. However, the warm summer temperatures in the MCA, particularly in a massive drought spanning AD 1300ĝ€"1400, frequently caused the lake to stratify strongly, leading to nutrient depletion. During AD 1478ĝ€"1870 (ie, the Atlantic-centered 'Little Ice Age' (LIA)), Lake Mina was characterized by weak spring circulation and increasing nutrient depletion, suggesting late ice-out conditions. Strong summer stratification and/or nutrient depletion in both time periods is shown by the occurrence of the nutrient-poor oligotrophic taxon Cyclotella pseudostelligera. The diatom and chrysophyte assemblages of the period of Euro-American settlement AD 1870ĝ€"2002 show higher nutrient availability and increased spring mixing intensity, as a result of forest clearance and increasingly earlier ice-out (documented in regional historical records). },
    DOI = { 10.1177/0959683609104030 },
}

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