Shifts in precipitation during the last millennium in northern Scandinavia from lacustrine isotope records

Rosqvist, Gunhild; Leng, Melanie J.; Goslar, Tomasz; Sloane, Hilary J.; Bigler, Christian; Cunningham, Laura; Dadal, Anna; Bergman, Jonas; Berntsson, Annika; Jonsson, Christina E.; Wastegård, Stefan

doi:10.1016/j.quascirev.2012.10.030

Cited by 22 publications

(28 citation statements)

References 43 publications

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“…There is limited information on precipitation changes in the early LIA, but isotopes from tree rings and lake sediments from northern Scandinavian indicates that wet summers occurred between ca. 1300 and 1450 (Young et al, 2012;Rosqvist et al, 2013), while moisture sensitive tree-ring data from Finland indicate that this was quite a dry period (Helama et al, 2009a). Moreover, glacial expansion in Norway (Dahl and Nesje, 1994), an extended period of positive NAO (Trouet et al, 2009), increasing lake levels in Finland (Nevalainen et al, 2013), as well as high return intervals of forest fires in Sweden (Drobyshev et al, 2014) all indicate an increase in precipitation during this particular period.…”

Section: Tree-rings and Climate-early Liamentioning

confidence: 97%

Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

et al. 2014

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Trees growing at their altitudinal or latitudinal distribution in Fennoscandia have been widely used to reconstruct warm season temperatures, and the region hosts some of the world's longest tree-ring chronologies. These multi-millennial long chronologies have mainly been built from tree remains found in lakes (subfossil wood from lake-shore trees). We used a unique dataset of Scots pine tree-ring data collected from wood remains found on a mountain slope in the central Scandinavian Mountains, yielding a chronology spanning over much of the last 1200 years. This data was compared with a local subfossil wood chronology with the aim to (1) describe growth variability in two environments during the Medieval Climate Anomaly (MCA) and the early Little Ice Age (LIA), and (2) investigate differences in growth characteristics during these contrasting periods. It was shown that the local tree-line during both the MCA and early LIA was almost 150 m higher that at present. Based on living pines from the two environments, tree-line pine growth was strongly associated with mid-summer temperatures, while the lake-shore trees showed an additional response to summer precipitation. During the MCA, regarded to be a period of favorable climate in the region, the tree-ring data from both environments showed strong coherency and moderate growth variability. In the early LIA, the two chronologies were less coherent, with the tree-line chronology showing more variability, suggesting different growth responses in the two environments during this period of less favorable growing conditions. Our results indicate that tree-ring width chronologies mainly based on lake-shore trees may need to be re-evaluated.

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Section: Tree-rings and Climate-early Liamentioning

confidence: 97%

Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

et al. 2014

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“…a BP has been inferred from two highly resolved lake sediment records in NW and west‐central Sweden (Rosqvist et al . ). From c .…”

Section: Environmental and Climatic Implicationsmentioning

confidence: 97%

Late Holocene high precipitation events recorded in lake sediments and catchment geomorphology, Lake Vuoksjávrátje, NW Sweden

Berntsson

Jansson

Kylander

et al. 2015

Boreas

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In this paper, we show the potential of combining multi-proxy analysis of lake sediments with catchment geomorphology to better understand palaeoenvironmental changes. Previous studies have suggested that alpine lakes in N Sweden may be highly sensitive to variations in catchment erosion and precipitation, and that this sensitivity may influence ecologically based reconstructions of past temperature changes. We analysed lake sediments covering the last 5100 years from the alpine Lake Vuoksjavratje in NW Sweden in order to identify different erosional regimes in the lake catchment, sediment sources and lake sedimentary processes, which ultimately affect the palaeoecological record. The measured proxies include elemental geochemistry from XRF core scanning, grain size, sediment accumulation rates, fraction of terrestrial organic carbon and geomorphological mapping, supported by previously published chironomid and total organic carbon data. From the integrated results we identified time intervals when increased intensity of precipitation altered sedimentation and lake catchment erosional processes. The most prominent event occurred c. 2900 cal. a BP and is interpreted to be the result of excessive precipitation, possibly related to the climatic shift towards cooler and wetter conditions referred to as the 2.8 ka event

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“…yr BP, and linked the cloudiness to shifts in regional atmospheric circulation. Rosqvist et al (2013) concluded based on higher δ 18 O registered in diatom silica from Lake Spåime and Lake Stuor Guossasjavri (67°50′, 19°40′), that these shifts in atmospheric circulation caused wet summers in both Lapland and Jamtli in northern Sweden. We note a higher but less reliable inferred JulyT and raised Ti values in the Vuoksjávrátje stratigraphy during these times.…”

Section: Comparison With Other Palaeoclimate Recordsmentioning

confidence: 99%

Late-Holocene temperature and precipitation changes in Vindelfjällen, mid-western Swedish Lapland, inferred from chironomid and geochemical data

2013

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In this article, we present results from a palaeolimnological study from Lake Vuoksjávrátje in the mountain tundra region in the Vindelfjällen Mountains, northwest Sweden. We suggest that the influence of precipitation may be one of the factors causing discrepancies between chironomid-based late-Holocene July temperature (JulyT) reconstructions from Fennoscandia. We combine quantitative temperature reconstruction using chironomids for the last 5100 years with qualitative analysis of chironomid composition and geochemical analyses, such as x-ray fluorescence (XRF), total organic carbon (TOC) and C/N analysis. The studied sequence is dated by 210 Pb, 137 Cs and 11 14 C datings from terrestrial macrofossils. The aim of the study was to use chironomids to reconstruct late-Holocene summer temperature variation on a multi-centennial to centennial timescale and to use geochemical data to identify periods during which the changes in chironomid composition might have been forced by environmental variables other than temperature, such as within lake processes or precipitation. Based on ordination techniques, and a comparison between chironomid-inferred JulyTs and changes in minerogenic sedimentation with regional temperature and wetness records, it is concluded that the JulyT signal was modulated by precipitation. The proxies indicate that both JulyT and annual precipitation have influenced the chironomid communities in Lake Vuoksjávrátje, and that catchment-related processes caused by enhanced precipitation have overridden the summer temperature signal between 3000 and 2200 cal. yr BP, and between 1050 and 100 cal. yr BP.

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Shifts in precipitation during the last millennium in northern Scandinavia from lacustrine isotope records

Cited by 22 publications

References 43 publications

Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

Growth dynamics of tree-line and lake-shore Scots pine (Pinus sylvestris L.) in the central Scandinavian Mountains during the Medieval Climate Anomaly and the early Little Ice Age

Late Holocene high precipitation events recorded in lake sediments and catchment geomorphology, Lake Vuoksjávrátje, NW Sweden

Late-Holocene temperature and precipitation changes in Vindelfjällen, mid-western Swedish Lapland, inferred from chironomid and geochemical data

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