Pollen Evidence for Late Pleistocene Bering Land Bridge Environments from Norton Sound, Northeastern Bering Sea, Alaska
| Autor: | Thomas A. Ager, R. Lawrence Phillips |
|---|---|
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Arctic, Antarctic, and Alpine Research. 40:451-461 |
| ISSN: | 1938-4246 1523-0430 |
| DOI: | 10.1657/1523-0430(07-076)[ager]2.0.co;2 |
| Popis: | After more than half a century of paleoenvironmental investigations, disagreements persist as to the nature of vegetation type and climate of the Bering land bridge (BLB) during the late Wisconsin (Sartan) glacial interval. Few data exist from sites on the former land bridge, now submerged under the Bering and Chukchi Seas. Two hypotheses have emerged during the past decade. The first, based on pollen data from Bering Sea islands and adjacent mainlands of western Alaska and Northeast Siberia, represents the likely predominant vegetation on the Bering land bridge during full-glacial conditions: graminoid-herb-willow tundra vegetation associated with cold, dry winters and cool, dry summer climate. The second hypothesis suggests that dwarf birch-shrub-herb tundra formed a broad belt across the BLB, and that mesic vegetation was associated with cold, snowier winters and moist, cool summers. As a step towards resolving this controversy, a sediment core from Norton Sound, northeastern Bering Sea was ra... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|