What question did this study set out to answer?

To reconstruct ecosystem and climatic variations during the last glacial–interglacial transition in southwestern Alaska and evaluate biotic sensitivity to Younger Dryas cooling.

September 30, 2002Global Change Biology

Response of tundra ecosystem in southwestern Alaska to Younger‐Dryas climatic oscillation

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Authors

FHFeng Sheng HuBeijing Normal University BLBethany LeeUniversity of Illinois Urbana-Champaign DKDarrell S. KaufmanNorthern Arizona University

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Implication

Palaeolimnological analysis reveals rapid tundra ecosystem shifts during Younger Dryas cooling, indicating synchronous North Pacific and North Atlantic climate sensitivity.

Key Points

To reconstruct ecosystem and climatic variations during the last glacial–interglacial transition in southwestern Alaska and evaluate biotic sensitivity to Younger Dryas cooling.
Analyzed southwestern Alaskan lake sediment cores for fossil pollen assemblages, biogenic-silica content (BSiO2 %), and organic-carbon content (OC %).
Established a chronology using radiocarbon dating calibrated to calendar years before present (cal BP).
Compared regional vegetation and geochemical trajectories with Greenland ice-core δ18O palaeoclimate records.
Betula shrub tundra expanded at ~13,600 cal BP (Betula pollen rose from <<5% to >>20%), abruptly collapsed to herb tundra at ~13,000 cal BP (dropping from 28% to <<5%), and recovered at 11,600 cal BP.
Higher BSiO2 % and OC % coincided with shrub-tundra phases, indicating increased aquatic productivity and soil stability relative to herb-dominated cold intervals.
Sediment records closely tracked the Greenland ice-core δ18O profile from onset to termination, demonstrating that Younger Dryas climatic oscillations occurred synchronously across the North Pacific and North Atlantic.

Cite This Study

Hu et al. (2002) studied this question.

synapsesocial.com/papers/6a0e4add2d2f13287578d513 https://doi.org/10.1046/j.1365-2486.2002.00550.x

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Implication

Palaeolimnological analysis reveals rapid tundra ecosystem shifts during Younger Dryas cooling, indicating synchronous North Pacific and North Atlantic climate sensitivity.

Response of tundra ecosystem in southwestern Alaska to Younger‐Dryas climatic oscillation

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Implication

Key Points

Cite This Study

Response of tundra ecosystem in southwestern Alaska to Younger‐Dryas climatic oscillation

Discussion

Member takes

Implication

Key Points

Cite This Study

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