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International Journal of Geosciences 2018年第6期9卷 308-319页

作者： Alexander orkhonselenge Munkhjargal Uuganzaya Laboratory of Geochemistry & Geomorphology School of Arts & Sciences National University of Mongolia Ulaanbaatar Mongolia

This study provides a map of glacial geomorphology of Mt. Asralt Khairkhan and Mt. Baga Khentii Saridag in Khentii Mountain Range in northeastern Mongolia. In the Khentii Mountain Range, only two types of glacial landforms including glacial cirques and terminal moraines are observed for the paleoglacial reconstructions of Mt. Asralt Khairkhan and Mt. Baga Khentii Saridag, and are mapped based on a mapping from 30 m resolution ASTER DEM and Landsat 8 satellite imagery. Spatial distribution of the glacial landforms indicates that the Khentii Mountain Range has experienced valley glaciations with small ice caps centered on the high mountains. The glacial cirques mark numerous glacial erosional landforms, while the terminal moraines indicate glacial advances and depositional landforms at outlets of valleys. Outer limits of these glacial landforms show their maximum glaciation of 10.0 km2 and 0.7 km2 for Mt. Asralt Khairkhan and Mt. Baga Khentii Saridag, respectively. This study demonstrates that spatial analysis of the glacial landforms is crucial for reviewing the paleoglacier extent. The map of the glacial geomorphology will be a key for further detailed studies in paleoglaciology and paleoclimate of the mountain range.

关键词： Glacial Landforms Paleoglaciers Khentii Mountain Range Mongolia

Impacts of Modern Glacier Changes on Surface Water Resources in Western and Northern Mongolia

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Journal of Water Resource and Protection 2018年第6期10卷 559-576页

作者： Alexander orkhonselenge Jonathan M. Harbor Laboratory of Geochemistry & Geomorphology National University of Mongolia Ulaanbaatar Mongolia Department of Earth Atmospheric & Planetary Sciences Purdue University Lafayette Indiana USA Department of Physical Geography & Quaternary Geology Stockholm University Stockholm Sweden

Water trapped in glaciers and in lakes impounded by landforms created by glaciers (glacial lakes) are an important component of the hydrology and water resources in high mountain areas of Central Asia. Changes in modern glaciers and glacial lakes are an important component of the hydrology of watersheds in the Mongolian Altai and Khuvsgul Mountain Ranges, western and northern Mongolia, respectively. Here we focus on Mt. Ikh Turgen and Mt. Munkh Saridag, isolated mountains of the Mongolian Altai and Khuvsgul Mountain Ranges, respectively. We use remote sensing to track changes in modern glaciers over time with mapping at scales of 1:200,000 for Mt. Ikh Turgen and 1:90,000 for Mt. Munkh Saridag based on imagery from Google Earth, 30 m resolution Aster Digital Elevation Model (DEM) and 30 m resolution Landsat 5 TM. Mt. Ikh Turgen lost 45.6% of its total glacier area between 1970 (41.4 km2) and 2011 (18.9 km2) and the Equilibrium Line Altitude (ELA) of the glaciers increased in elevation by 98 m and 144 m on north and south aspects, respectively. Mt. Munkh Saridag lost 57.3% of its total glacier area between 1970 (901 m2) and 2007 (381 m2) and the local ELA rose by 47 m and 80 m on north and south aspects, respectively. These mountains are located at similar latitudes, and so the greater percentage loss of glacier area in Mt. Munkh Saridag and faster changes in ELAs in Mt. Ikh Turgen may reflect variations in elevation and aspect, duration of solar radiation, and vulnerability to solar radiation, as well as variations in glacier scale. This study demonstrates the importance of spatial analyses of modern glaciers in understanding the context of hydrological changes within which any sustainable water resource management plan must be situated.

关键词： Surface Water Overflow Dynamics Modern Glaciers Altai Mountains Khuvsgul Mountains Mongolia

Climate-Driven Changes in Lake Areas for the Last Half Century in the Valley of Lakes, Govi Region, Southern Mongolia

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Natural Science 2018年第7期10卷 263-277页

作者： Alexander orkhonselenge Goro Komatsu Munkhjargal Uuganzaya Laboratory of Geochemistry & Geomorphology National University of Mongolia Ulaanbaatar Mongolia International Research School of Planetary Sciences Università d’Annunzio Pescara Italy

This study presents the changes in lake areas in the Valley of Lakes, the Govi region, southern Mongolia. The recent changes in lake areas show decreases depending on vulnerability of lake basins and response of Govi landscape to the present climatic warming. During the recent 44 - 45 years (from 1970 to 2014 or 2015), modern lakes have encountered the present rapid increase in temperature, water evaporation and drying up that induced the reduction in lake areas in the Valley of Lakes. The finding of the reduction in lake areas is consistent with the trends on increasing in temperature since 1995 and fluctuating precipitation since 1975. Investigations with detailed chronology of lake sediment are needed from the lakes to review a more complete evolution of lake basins during the Late Quaternary paleoclimatic history in Mongolia and Central Asia.

关键词： Lakes Lake Areas Climate Change Govi Region Southern Mongolia

Holocene sedimentary records in Inner Continental Asia:Mongolian Plateau and Tibetan Plateau

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地球环境学报 2011年第1期 320-321页

作者： orkhonselenge a Kashiwaya K Krivonogov S Nakamura S Institute of Nature and Environmental Technology Kanazawa University Korean Institute of Geology and Mineralogy 3. Center for Chronological Research Nagoya University

This study aims to reveal Holocene environmental changes on the bases of the physical and chemical analyses of the sediment core obtained from Lake Kliuvsgul in Mongolian Plateau and Lake Siling-co in Tibetan *** results of the Holocene sedimentary sequence in Borsog Bay of Lake Khuvsgul shows that certain environmental shifts at about Little Ice Age and 3.5 ka BP;noticeable increases are detected in mineral grain size,whole grain size,mineral content and grain density during the periods when the organic matter content,biogenic silica content and diatom abundance *** sediment in Lake Siling-co indicates a comparatively large fluctuations in hydrological conditions at a water inflow for a short period at about 3000;000 a BP;and decreases in the water level at about 4000 a BP and 3500 a BP,when mineral fractions and whole sediments return to coarse grains,mineral content increased,and organic matter and biogenic silica *** results suggest the comparatively large hydrological changes in the inner Asia during the Late Holocene with a similar pattern of the humidity and aridity in the both lakes.

关键词： Asia Holocene sedimentary records in Inner Continental Asia

Effects of feeding a diet containing Gymnema sylvestre extract: attenuating progression of obesity in C57BL/6J mice

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Asian Pacific Journal of Tropical Medicine 2016年第5期9卷 425-431页

作者： Hyeon-Jeong Kim Seong-Ho Hong Seung-Hee Chang Sanghwa Kim Ah Young Lee Yoonjeong Jang orkhonselenge Davaadamdin Kyeong-Nam Yu Ji-Eun Kim Myung-Haing Cho Laboratory of Toxicology College of Veterinary Medicine Seoul National University Graduate Group of Tumor Biology Seoul National University Graduate School of Convergence Science and Technology Seoul National University Advanced Institutes of Convergence Technology Seoul National University Institute of Green Bio Science Technology Seoul National University

Objective: To investigate the effect of Gymnema sylvestre extract(GS) on initial anti-obesity, liver injury, and glucose homeostasis induced by a high-fat diet(HFD). Methods: The dry powder of GS was extracted with methanol, and gymnemic acid was identified by high performance liquid chromatography as deacyl gymnemic acid. Male C57BL/6J mice that fed on either a normal diet, normal diet containing 1 g/kg GS(CON+GS) HFD, or HFD containing 1.0 g/kg GS(HFD+GS) for 4 weeks were used to test the initial anti-obesity effect of GS. Body weight gain and food intake, and serum levels about lipid and liver injury markers were measured. Histopathology of adipose tissue and liver stained with hematoxylin and eosin(H&E) and oil-red O were analyzed. After 4 weeks of GS extract feeding, intraperitoneal glucose tolerance test(IPGTT) was performed. Results: The methanol extracts of GS exerted significant anti-obesity effects in HFD+GS group. They decreased body weight gain, a lower food and energy efficiency ratio, and showed lower serum levels of total cholesterol(TC), triglyceride(TG), low-density lipoprotein(LDL)-cholesterol, very-low density lipoprotein(VLDL)-cholesterol and leptin compared with the HFD group. The decreases of abdominal as well as epididymal fat weight and adipocyte hypertrophy, lipid droplets in liver, and serum levels of aspartate aminotransferase(AST) and alanine transaminase(ALT) were also observed. The CON+GS group showed an effect of glucose homeostasis compared to the CON group. Conclusions: This study shows that GS provide the possibility as a key role in an initial anti-obesity effects feeding with a HFD.

关键词： Gymnema sylvestre extract Obesity Adipocyte Body weight gain High-fat diet Liver injury

从Borsog湾Khuvsgul湖的湖泊沉积物推得的蒙古北部全新世水文环境的变化（英文）

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地球环境学报 2011年第3期2卷 457-461页

作者： orkhonselenge a MINO K KASHIWAYA K KRIVONOGOV S YAMAMOTO T SAKAGUCHI A NAKAMURA T Institute of Nature&Environmental Technology Kanazawa University LLRL Institute of Nature&Environmental TechnologyKanazawa University Institute of Geology Geophysics & MineralogySB RAS Department of Earth&Planetary System Sciences Hiroshima University Center for Chronological Research Nagoya University

A 13-m long sediment core from Borsog Bay of Lake Khuvsgul,northern Mongolia records hydro-environmental changes during the past 10000 years;three rapid environmental changes(ca.2700 a BP,ca.6000 a BP and ca.8000 a BP based on ^(14)C dates of organic carbon materials) are detected in depth profiles of sediment physical *** changes in the physical properties of the core(grain size,grain density and water content) also suggest three periods of large discharge from outside and three periods of stable input(200-500 cm,800-980 cm and 1050-1200 cm).The sedimentation rates in the stable period are 0.102 cm·a^(-1),0.085 cm·a^(-1) and 0.139 cm·a^(-1),*** periods of large discharge likely correspond to the intervals of the three rapid environmental changes,indicating that there were three rapid and high discharge periods related to melt water and/or heavy rainfall during the past 10000 years in this *** analytical results also show that the physical properties are valuable in reconstructing past hydro-geomorphological fluctuations in the lake-catchment system.

关键词： sedimentation rate hydro-geomorphology environmental change Holocene Lake Khuvsgul Mongolia