Abstract
Abstract. To date, terrestrial archives of long-term climatic change within the Arctic have widely been restricted to ice cores from Greenland and, more recently, sediments from Lake El'gygytgyn in northeast Arctic Russia. Sediments from this lake contain a paleoclimate record of glacial-interglacial cycles during the last three million years. Low-resolution studies at this lake have suggested that changes observed during Transition IV (the transition from marine isotope stage (MIS) 10 to MIS 9) are of greater amplitude than any observed since. In this study, geochemical parameters are used to infer past climatic conditions thus providing the first high-resolution analyses of Transition IV from a terrestrial Arctic setting. These results demonstrate that a significant shift in climate was subsequently followed by a rapid increase in biogenic silica (BSi) production. Following this sharp increase, bioproductivity remained high, but variable, for over a thousand years. This study reveals differences in the timing and magnitude of change within the ratio of silica to titanium (Si/Ti) and BSi records that would not be apparent in lower resolution studies. This has significant implications for the increasingly common use of Si/Ti data as an alternative to traditional BSi measurements.
Highlights
Recent rapid warming observed within the latter part of the 20th century has raised many questions about the rate at which global climate can change
The magnetic susceptibility (MS) values continue to increase until ∼ 334.5 ka when maximum values are reached, coinciding with maximal total organic carbon (TOC) values and a notable increase in the sediment accumulation rate (SAR)
The first high-resolution records of Transition IV from a terrestrial Arctic setting suggest the occurrence of a short interstadial period prior to deglaciation
Summary
Recent rapid warming observed within the latter part of the 20th century has raised many questions about the rate at which global climate can change. Paleoclimatic data from a variety of proxies have demonstrated multiple, rapid shifts in climate have punctuated earth’s history. That abrupt climate changes can, and have occurred, is accepted, there is a need for an increased understanding of such changes, the rate at which they occur, and modelling to underSstaonldidtheEmaercthhanisms behind such changes. These data will inform us of essential information for predicting tuning climate models used for predicting future climate change
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