800-yr-long records of annual air temperature and precipitation over southern Siberia inferred from Teletskoye Lake sediments   总被引：2，自引：0，他引：2  

Ivan Kalugin  Andrei Daryin  Lyubov Smolyaninova  Andrei Andreev  Bernhard Diekmann  Oleg Khlystov 《Quaternary Research》2007,67(3):400-410

A unique 800-yr-long record of annual temperatures and precipitation over the south of western Siberia has been reconstructed from the bottom sediments of Teletskoye Lake, Altai Mountains using an X-ray fluorescence scanner (XRF) providing 0.1-mm resolution timeseries of elemental composition and X-ray density (XRD). Br content appears to be broadly correlative with mean annual temperature variations because of changes in catchment vegetation productivity. Sr/Rb ratio reflects the proportion of the unweathered terrestrial fraction. XRD appears to reflect water yield regime and sediment flux. Sedimentation is rather continuous because annual clastic supply and deposited mass are the same. The artificial neural networks method was applied to convert annual sedimentary time-series of XRD, Br content, and Sr/Rb ratio to annual records of temperature and precipitation using a transfer function. Comparison of these reconstructed Siberian records with the annual record of air temperature for the Northern Hemisphere shows similar trends in climatic variability over the past 800 yr. Estimated harmonic oscillations of temperature and precipitation values for both historical and reconstructed periods reveal subdecadal cyclicity.  相似文献   

Assessment of runoff,water and sediment quality in the Selenga River basin aided by a web-based geoservice     

Daniel Karthe  Sergey Chalov  Vsevolod Moreido  Margarita Pashkina  Anna Romanchenko  Gunsmaa Batbayar  Andrei Kalugin  Katja Westphal  Marcus Malsy  Martina Flörke 《Water Resources》2017,44(3):399-416

The Selenga River is the main artery feeding Lake Baikal. It has a catchment of ~450000 km² in the boundary region between Northern Mongolia and Southern Siberia. Climate, land use and dynamic socioeconomic changes go along with rising water abstractions and contaminant loads originating from mining sites and urban wastewater. In the future, these pressures might have negative impacts on the ecosystems of Lake Baikal and the Selenga River Delta, which is an important wetland region in itself and forms the last geobiochemical barrier before the Selenga drains into Lake Baikal. The following study aims to assess current trends in hydrology and water quality in the Selenga-Baikal basin, identify their drivers and to set up models (WaterGAP3 framework and ECOMAG) for the prediction of future changes. Of particular relevance for hydrological and water quality changes in the recent past were climate and land use trends as well as contaminant influx from mining areas and urban settlements. In the near future, additional hydrological modifications due to the construction of dams and abstractions/water diversions from the Selenga’s Mongolian tributaries could lead to additional alterations.  相似文献   

Traces of the Tunguska Event (1908) in Sediments of Zapovednoe Lake Based on SR–XRF Data     

Darin  A. V.  Rogozin  D. Yu.  Meydus  A. V.  Babich  V. V.  Kalugin  I. A.  Markovich  T. I.  Rakshun  Ya. V.  Darin  F. A.  Sorokoletov  D. S.  Gogin  A. A.  Senin  R. A.  Degermendzhi  A. G. 《Doklady Earth Sciences》2020,492(2):442-445

Doklady Earth Sciences - An anomalous layer enriched with chemical elements indicating the presence of terrigenous matter was discovered in the sediment core of Zapovednoe Lake located 60 km from...  相似文献