Drought coincident with aeolian activity in a Great Lakes coastal dune setting during the Algoma Phase (3.1–2.4 ka), southwest Michigan
| Autor: | Edward C. Hansen, Kenneth Lepper, Suzanne DeVries-zimmerman, Julie A. Wolin, Trisha L. Spanbauer, Timothy G. Fisher |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category Ecology 010604 marine biology & hydrobiology Wetland 010501 environmental sciences Aquatic Science Sedimentation medicine.disease_cause 01 natural sciences Coastal dunes Weak correlation Oceanography Pollen Aeolian sand visual_art medicine visual_art.visual_art_medium Aeolian processes Charcoal Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Great Lakes Research. 47:1468-1484 |
| ISSN: | 0380-1330 |
| DOI: | 10.1016/j.jglr.2021.04.017 |
| Popis: | Aeolian studies of Lake Michigan’s coastal dunes have yet to elucidate what factors control their episodic activity over the past 5000 years. High lake levels exposing sand along with increased storminess is generally accepted for high perched dunes. This hypothesis, however, remains poorly tested for low perched dunes along the southeast Lake Michigan coastline. Here, small lakes in the lee of dune complexes contain aeolian sand and various biological proxies. Age and sedimentation rate models from Gilligan Lake cores guide analysis of aeolian sand, charcoal, pollen, and diatoms at high resolution (1 cm [10.4 yr/cm]) during the high-water Algoma Phase (3.1–2.4 ka) of the upper Great Lakes. The diatoms record a transition from a deep, more acidic lake to a shallower, more alkaline lake with fewer wetlands. This transition is accompanied by a stepped increase in the amount of aeolian sand. There is a weak correlation (R2 0.5, p |
| Databáze: | OpenAIRE |
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