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  • SAGE Publications  (3)
  • 2005-2009  (3)
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  • SAGE Publications  (3)
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  • 2005-2009  (3)
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Fachgebiete(RVK)
  • 1
    Online-Ressource
    Online-Ressource
    Late-Holocene summer temperature reconstruction from chironomid assemblages of Lake Anterne, northern French Alps
    SAGE Publications ; 2009
    In:  The Holocene Vol. 19, No. 2 ( 2009-03), p. 317-328
    Details
    In: The Holocene, SAGE Publications, Vol. 19, No. 2 ( 2009-03), p. 317-328
    Kurzfassung: We present a chironomid-based reconstruction of late-Holocene temperature from Lake Anterne (2060 m a.s.l.) in the northern French Alps. Chironomid assemblages were studied in 49 samples along an 8 m long sediment core covering the last 1800 years. July air temperatures were inferred using an inference model based on the distribution of chironomid assemblages in 100 Swiss lakes. The transfer function has a leave-one-out cross-validated coefficient of determination ( r ) of 0.88, a root mean square error of prediction (RMSEP) of 1.40°C. Despite possible biases induced by methodological aspects and the ecological complexity of the chironomid response to both climate and environmental changes, the concordance of the Lake Anterne temperature reconstruction with other Alpine records suggests that the transfer function has successfully reconstructed past summer temperature during the last two millennia. The twentieth century is the only section of the record which shows a poor agreement with other climate reconstructions and the distinct warming found in most instrumental records for this period is not apparent in the Lake Anterne record. Stocking of the lake with fish from the early twentieth century onwards was found to be a possible cause of changes in the chironomid fauna and subsequent distortion in the inferred climate signal. Evidence was found of a cold phase at Lake Anterne between AD 400 and 680, a warm episode between AD 680 and 1350, and another cold phase between AD 1350 and 1900. These events were possibly correlated to the so-called `Dark Age Cold Period' (DACP), the `Mediaeval Warm Period' (MWP) and the `Little Ice Age' (LIA). The chironomid-based inference model reconstructed a July air temperature decrease of c. 0.7°C for the DACP and 1.3°C for the LIA compared with the temperature prevailing during the MWP.
    Materialart: Online-Ressource
    ISSN: 0959-6836 , 1477-0911
    URL: Article
    DOI: 10.1177/0959683608100576
    RVK:
    RA 1000
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2009
    ZDB Id: 2027956-5
    SSG: 14
    SSG: 3,4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    High-resolution chironomid-inferred temperature history since ad 1580 from varved Lake Silvaplana, Switzerland: comparison with local and regional reconstructions
    SAGE Publications ; 2009
    In:  The Holocene Vol. 19, No. 8 ( 2009-12), p. 1201-1212
    Details
    In: The Holocene, SAGE Publications, Vol. 19, No. 8 ( 2009-12), p. 1201-1212
    Kurzfassung: Chironomids were used to reconstruct mean July air temperatures between c. AD 1580 and 2001 at Lake Silvaplana, a varved lake located in the Engadine, eastern Swiss Alps. The goal of this study was to reconstruct temperature changes at near-annual resolution, and validate the reconstruction by comparison with records based on early instrumental data, documentary proxy evidence, dendrochronology, geochemical (biogenic silica (BSi)) and mineralogical data (quartz/mica ratios) at local and regional scales. Warmer than-the-climate-normal (AD 1961—1990) mean July air temperatures were inferred between c. AD 1610 and 1662, AD 1710 and 1740, AD 1790 and 1866, AD 1940 and 1960 and AD 1990 and 2001. Colder-than-the-climate-normal July air temperatures were reconstructed between c. AD 1662 and 1710, AD 1740 and 1790, AD 1866 and 1919, and AD 1970 and 1990. The 420-year chironomid-inferred mean July air temperature record was significantly ( p 〈 0.01) related to June—September (JJAS) temperatures reconstructed from early instrumental and documentary data at regional scale, JJA temperature inferred from documentary proxy evidence at local scale and summer temperatures based on early instrumental data in central Europe. When the Z-scores of warm/cold periods were compared between records, only one period ( c. AD 1740—1790) did not show significant correlations between the chironomid record and any of the eight other records considered here, probably because of increased precipitation and changes in the sediment composition which influenced the chironomid assemblages. 75% of the periods considered had significant correlations between the chironomid records, and both the reconstruction based on quartz/mica ratios and the inferred JJAS early instrumental and documentary proxy evidence, while 60% of the periods showed significant correlations between the chironomid-based record and the reconstruction based on early instrumental data of Central Europe. These results suggest that chironomids in the sediment of Lake Silvaplana yield valid temperature reconstructions at regional scales for the last 420 years.
    Materialart: Online-Ressource
    ISSN: 0959-6836 , 1477-0911
    URL: Article
    DOI: 10.1177/0959683609348253
    RVK:
    RA 1000
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2009
    ZDB Id: 2027956-5
    SSG: 14
    SSG: 3,4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Vegetation history, fire history and lake development recorded for 6300 years by pollen, charcoal, loss on ignition and chironomids at a small lake in southern Kyrgyzstan (Alay Range, Central Asia)
    SAGE Publications ; 2007
    In:  The Holocene Vol. 17, No. 7 ( 2007-11), p. 977-985
    Details
    In: The Holocene, SAGE Publications, Vol. 17, No. 7 ( 2007-11), p. 977-985
    Kurzfassung: Analyses of pollen, microscopic charcoal, loss on ignition (LOI) and chironomids in the sediment of the small sub-alpine lake Kichikol (2541 m a.s.l.; 39°59'N, 73°33'E; Alay Range, Kyrgyzstan) provide new data to reconstruct the vegetational and lacustrine history during the past 6300 years. From 6300—5100 calibrated 14 C years BP (cal. yr BP) semi-deserts with Chenopodiaceae and Ephedra and rather open Juniperus stands persisted around the lake. At 5100—4000 cal. yr BP dense Juniperus forest established. Around 4000 cal. yr BP the forest retreated and was probably restricted to north-facing slopes, as is the case today. Changes in the hydrology of Kichikol are inferred from lithological properties, pollen of aquatic plants and remains of aquatic invertebrates. The lacustrine development of Kichikol suggests a step-wise increase in humidity during the mid and late Holocene, with major shifts recorded at 5000 and 4000 cal. yr BP. At the beginning of the record Kichikol was a very shallow, possibly temporary pond. An initial rise in water-table is registered at c. 5000 cal. yr BP, followed by a second rise to near present levels at c. 4000 cal. yr BP. These hydrological shifts could be related to an increase of westerly moisture transport from the Mediterranean region as a consequence of a late-Holocene weakening of the Central Asian High and Indian monsoon systems. Moderate human impact in the region is recorded after 2100 cal. yr BP, as indicated by pollen of Plantago lanceolata-type and a slight increase of charcoal accumulation rates. Considering the general course of climate as well as human impact we conclude that the present forest composition is natural or quasi-natural.
    Materialart: Online-Ressource
    ISSN: 0959-6836 , 1477-0911
    URL: Article
    DOI: 10.1177/0959683607082413
    RVK:
    RA 1000
    Sprache: Englisch
    Verlag: SAGE Publications
    Publikationsdatum: 2007
    ZDB Id: 2027956-5
    SSG: 14
    SSG: 3,4
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
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