APPLICATION OF COMPOSITION METHODS FOR COMPUTING RUNOFF     

L. T. FEDOROV 《水文科学杂志》2013,58(4):64-69

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Periglacial sediment variations controlled by late Quaternary climate and lake level change at Elgygytgyn Crater, Arctic Siberia     

GEORG SCHWAMBORN  GRIGORY FEDOROV  LUTZ SCHIRRMEISTER  HANNO MEYER  HANS-W. HUBBERTEN 《Boreas: An International Journal of Quaternary Research》2008,37(1):55-65

Late Quaternary sediments in a permafrost environment recovered from the Elgygytgyn Impact Crater were studied to determine regional palaeoenvironmental variability and infer past water-level changes of the crater lake. Stratigraphic analysis of a 5 m long permafrost core is based on various lithological (grain size, total organic carbon, magnetic susceptibility) and hydrochemical (oxygen isotope composition, major cation content) properties and pore ice content. The results show that alluvial sediments accumulated on top of cryogenically weathered volcanic rock. Changes in the hydrochemical properties reflect different stages of cryogenic weathering. The lithological characteristics mark the transition from an erosive site to a site with accumulation. This environmental change is linked to a relative lake level highstand at >13 000 yr BP, when a shoreline bar was formed leading to slope sedimentation. Lake level dropped by 4 m during the Holocene.  相似文献