期刊
JOURNAL OF PALEOLIMNOLOGY
卷 43, 期 2, 页码 393-412出版社
SPRINGER
DOI: 10.1007/s10933-009-9338-3
关键词
Anthropocene; Arctic; Diatoms; Nitrogen; Paleolimnology; Spitsbergen
资金
- Swedish Research Council
Lake sediments from four small lakes on western Spitsbergen (Svalbard Archipelago, Norwegian High Arctic) preserve biostratigraphic and isotopic evidence for a complex suite of twentieth century environmental changes. At Lake Skardtjorna and Lake Tjornskardet on Nordenskioldkysten, there is a marked diatom floristic change coupled to increased diatom concentrations beginning around 1920. At Lake Istjorna and Lake Istjornelva, 25 km southwest of Longyearbyen, both diatom total valve and chrysophyte stomatocyst concentrations have increased dramatically since the beginning of the 1900s. The early twentieth century changes are probably related to climate warming after the Little Ice Age. However, the most pronounced changes in diatom assemblages seem to have occurred in the last few decades. At the same time, nitrogen stable isotopes in sediment organic matter in two of the lakes became progressively depleted by similar to 2 parts per thousand, which is consistent with diffuse atmospheric inputs from anthropogenic sources and attendant fertilization. These data suggest that climate change and nitrogen deposition may be acting together in driving these lakes towards new ecological states that are unique in the context of the Holocene.
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