期刊
MARINE MICROPALEONTOLOGY
卷 126, 期 -, 页码 1-18出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.marmicro.2016.05.002
关键词
Diatoms; Silicoflagellates; Holocene; Gulf of Alaska; SST; Salinity; Fjord
类别
资金
- NSF [OCE02-41828]
- USGS Climate and Land Use Change, Research and Development Program
Diatom and silicoflagellate assemblages in cores EW0408-47JC, -47TC, -46MC (57 degrees 34.5278' N, 136 degrees 3.7764' W, 114 m water depth) taken from the outer portion of Slocum Arm, a post-glacial fjord in southeastern Alaska, reveal the paleoclimatic and paleoceanographic evolution of the eastern margin of the Gulf of Alaska (GoA) during the past 10,000 years. Between similar to 10 and 6.8 cal ka, periods of low salinity and cool water conditions alternated with brief intervals marked by the increased influx of oceanic, more saline and likely warmer waters. Increased surface water stability characterized by a middle Holocene interval between similar to 6.8 and 3.2 cal ka is typified by increased abundances of northeastern Pacific Thalassiosira spp. that are indicative of spring coastal blooms and decreased abundances of warm and higher salinity oceanic diatoms. At similar to 3.2 cal ka, an abrupt increase in both the relative contribution of oceanic diatoms and silicoflagellates suggestive of cooler upwelling conditions occurred in the -47JC record. A stepwise increase in alkenone sea surface temperature in northern GoA core EW0408-85JC and increase in southern sourced precipitation in the carbonate 6180 record of Jellybean Lake (Yukon) present evidence that this similar to 3.2 cal ka event coincided with the onset of enhanced positive Pacific Decadal Oscillation like (PDO) conditions in the GoA. These positive PDO-like conditions persisted until similar to 1.0 cal ka and were followed by high amplitude fluctuations in the relative abundance of diatom and silicoflagellate assemblages. Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据