Sedimentary evidence for recent increases in production in Tibetan plateau lakes

The Tibetan Plateau is a vast, elevated plateau in Central Asia with an average elevation of over 4,500 m and contains the world’s third largest store of ice. It occupies a climatic transition zone between the Asian monsoons and westerly airflow. As a result of this location, the region is sensitive to changes in climate on timescales of decades to millennia and longer. Long-term data are needed to evaluate climatic changes and their impact on ecosystems, but in areas as remote as the Tibetan Plateau, long-term instrumental records of environmental change are geographically sparse and monitoring has only been undertaken in recent times. Paleolimnological approach might be then one of the few means by which environmental variability can be ascertained at scales that allow comparison with contemporary monitoring data and future model projections. Therefore, a paleolimnological study was undertaken in eight different lakes sampled along a North–South transect across the Tibetan Plateau analysing geochemistry and algal pigment in order to assess longer term variability in the trophic condition of these systems and their potential to reconstruct changes in relation to recent climate evolution and possible human impacts. Chronologies for the last century were based on radiometric techniques (210Pb, 241Am and 137Cs). Results show that inorganic sediment dominates the composition of the cores used in this study. Organic carbon constitutes less than 5% d.w. in all the lake cores, except for Kemen Co core where concentrations up to 14% d.w., are observed. Corg:N ratios are generally in the order of 5–10, indicating that autochthonous algal production is the principal biological source of organic matter. Pigment preservation is generally good throughout the cores from all lakes as shown by the 430:410 nm ratio that is generally around 1.0 or higher. Six out of eight lakes show an increase in primary production in recent times. High pre-1800 AD pigment concentrations were detected only in Qinghai Lake. Since most of the lakes show a similar behaviour in the most recent section of the core, we interpret this as a response to climate and land-use changes that have increased autochthonous production throughout the Tibetan Plateau.
 
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Andrea Lami (The Institute of Ecosystem Study(ISE)-CNR) - Simona Musazzi (The Institute of Ecosystem Study(ISE)-CNR) - Piero Guilizzoni (The Institute of Ecosystem Study(ISE)-CNR) - Stefano Gerli (The Institute of Ecosystem Study(ISE)-CNR) - Simon Turner (Department of Geography University College London- Environmental Change Research Centre) - Neil Rose (Department of Geography University College London- Environmental Change Research Centre) - Handong Yang (Department of Geography University College London- Environmental Change Research Centre) - Guangjian Wu (Institute of Tibetan Plateau Research (ITP), Chinese Academy of Sciences,) - Ruiqian Yang (Institute of Tibetan Plateau Research (ITP), Chinese Academy of Sciences,) (2010) . Sedimentary evidence for recent increases in production in Tibetan plateau lakes. https://geoportal.mountaingenius.org/geonetwork/srv/api/records/1f5bf07c-771e-41d4-b694-7da49cb8cd90
 

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2010-04-28T00:00:00
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Global change impacts on mountain lakes
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175-187
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HYDROBIOLOGIA Volume 648, Number 1,
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Global change impacts on mountain lakes
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0018-8158
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The issue entitled ""Global change impacts on mountain lakes” belongs to a "Hydrobiologia" series.
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Keywords ( Theme )
  • SHARE
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  • Tibet , Lakes
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  • Palaeolimnology , Geochemistry
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  • Algal pigment
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Abstract:"Sedimentary evidence for recent increases in production in Tibetan plateau lakes."  

Abstract:"Sedimentary evidence for recent increases in production in Tibetan plateau lakes."

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HYDROBIOLOGIA

Volume 648, Number 1, 175-187, DOI: 10.1007/s10750-010-0263-2

MOUNTAIN LAKES

Sedimentary evidence for recent increases in production in Tibetan plateau lakes

Andrea Lami, Simon Turner, Simona Musazzi, Stefano Gerli, Piero Guilizzoni, Neil L. Rose, Handong Yang, Guangjian Wu and Ruiqian Yang

From the issue entitled "Global change impacts on mountain lakes / Guest Editors: Hilde Eggermont, Martin Kernan & Koen Martens"

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746ec3c3-dab4-47c7-acbe-440122d4335e
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2012-02-01T16:42:48
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