Publication Date:
2014-09-16
Description:
Storfjorden, Svalbard, is an area of intense brine formation. The brine is cold, dense, rich in oxygen and CO 2 and has reduced pH. Storfjorden is unique because it contains well preserved agglutinated foraminifera dating back to the beginning of the last deglaciation. . We have investigated the distribution of calcareous and agglutinated benthic foraminifera, benthic oxygen and carbon isotopes, calcium carbonate, total organic carbon (TOC) and ice rafted debris (IRD) in five cores from Storfjorden comprising the Holocene and the deglaciation. The purpose of the study is to reconstruct brine formation in the past under different climate scenarios. The data indicate that in Storfjorden the ratio of agglutinated to calcareous benthic foraminifera can be taken as a measure of the strength of brine formation. The foraminiferal data, which are supported by stable isotopes, degree of fragmentation and geochemical parameters, signify that brine formation intensified during cold periods and weakened during warm periods. During the deglaciation, increased brine flow coincides with the Older Dryas, the Intra-Allerød Cold Period and the Younger Dryas. Brine formation increased from c. 8200 years BP reaching periodic maxima during the last 4000 years BP in response to the unstable climate. Maximum brine production correlates with the Dark Ages Cold Period c. 1500–1100 years BP and the Little Ice Age c. 600–100 years BP. Lower production correlates with the Roman Warm Period c. 2500–2000 years BP and the Medieval Warm Period c. 1000–700 years BP.
Print ISSN:
0883-8305
Electronic ISSN:
1944-9186
Topics:
Geosciences
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