Quaternary glaciations in the Verkhoyansk Mountains, Northeast Siberia

2010 ◽  
Vol 74 (1) ◽  
pp. 145-155 ◽  
Author(s):  
Georg Stauch ◽  
Frank Lehmkuhl
Keyword(s):  
Climate Changes ◽  
Ice Sheets ◽  
Optically Stimulated Luminescence ◽  
Ural Mountains ◽  
The West ◽  
Local Climate ◽  
Terminal Moraine ◽  
Geomorphological Mapping ◽  
Eurasian Continent ◽  
Polar Ural

AbstractGeomorphological mapping revealed five terminal moraines in the central Verkhoyansk Mountains. The youngest terminal moraine (I) was formed at least 50 ka ago according to new IRSL (infrared optically stimulated luminescence) dates. Older terminal moraines in the western foreland of the mountains are much more extensive in size. Although the smallest of these older moraines, moraine II, has not been dated, moraine III is 80 to 90 ka, moraine IV is 100 to 120 ka, and the outermost moraine V was deposited around 135 ka. This glaciation history is comparable to that of the Barents and Kara ice sheet and partly to that of the Polar Ural Mountains regarding the timing of the glaciations. However, no glaciation occurred during the global last glacial maximum (MIS 2). Based on cirque orientation and different glacier extent on the eastern and western flanks of the Verkhoyansk Mountains, local glaciations are mainly controlled by moisture transport from the west across the Eurasian continent. Thus glaciations in the Verkhoyansk Mountains not only express local climate changes but also are strongly influenced by the extent of the Eurasian ice sheets.

Antarctic Climate History and Global Climate Changes

2017 ◽  
Author(s):  
Pontus Lurcock ◽  
Fabio Florindo
Keyword(s):  
Ocean Circulation ◽  
Climate Changes ◽  
Numerical Models ◽  
Global Climate ◽  
Sediment Cores ◽  
Ice Sheets ◽  
Global Ocean ◽  
Climate History ◽  
Global Climate Changes ◽  
Planetary Albedo

Antarctic climate changes have been reconstructed from ice and sediment cores and numerical models (which also predict future changes). Major ice sheets first appeared 34 million years ago (Ma) and fluctuated throughout the Oligocene, with an overall cooling trend. Ice volume more than doubled at the Oligocene-Miocene boundary. Fluctuating Miocene temperatures peaked at 17–14 Ma, followed by dramatic cooling. Cooling continued through the Pliocene and Pleistocene, with another major glacial expansion at 3–2 Ma. Several interacting drivers control Antarctic climate. On timescales of 10,000–100,000 years, insolation varies with orbital cycles, causing periodic climate variations. Opening of Southern Ocean gateways produced a circumpolar current that thermally isolated Antarctica. Declining atmospheric CO2 triggered Cenozoic glaciation. Antarctic glaciations affect global climate by lowering sea level, intensifying atmospheric circulation, and increasing planetary albedo. Ice sheets interact with ocean water, forming water masses that play a key role in global ocean circulation.

scholarly journals HEAVY CLASTIC MINERALS AS AN INDICATOR OF GEODYNAMIC SETTINGS OF ACCUMULATION AND PROVENANCE OF CRETACEOUS SEDIMENTS OF THE WEST SAKHALIN TERRANE

2021 ◽  
pp. 68-86
Author(s):  
A.I. Malinovsky ◽  
Keyword(s):  
Large Scale ◽  
Volcanic Rocks ◽  
Source Area ◽  
Heavy Minerals ◽  
Clastic Material ◽  
The West ◽  
Geodynamic Settings ◽  
Eurasian Continent ◽  
Ocean Boundary ◽  
By Products

The article discusses the results of studying heavy clastic minerals from the Cretaceous sandy rocks of the West Sakhalin Terrane, and also presents their paleogeodynamic interpretation. It is shown that in terms of mineralogical and petrographic parameters, the terrane sandstones correspond to typical graywackes and are petrogenic rocks formed mainly by destruction of igneous rocks of the source areas. The sediments were found to contain both sialic, granite-metamorphic association minerals, and femic, formed by products of the destruction of basic and ultrabasic volcanic rocks. The interpretation of the entire set of data on the content, distribution and microchemical composition of heavy minerals was carried out by comparing them with minerals from older rocks and modern sediments accumulated in known geodynamic settings. The results obtained indicate that during the Cretaceous, sedimentation occurred along the continent-ocean boundary in a basin associated with large-scale left-lateral transform movements of the Izanagi Plate relative to the Eurasian continent. The source area that supplied clastic material to that basin combined a sialic landmass composed of granite-metamorphic and sedimentary rocks, a mature deeply dissected ensialic island arc, and fragments of accretion prisms, in the structure of which involved ophiolites.

scholarly journals Tajikistan’s Perspective on Eurasia

2019 ◽  
Vol 75 (1) ◽  
pp. 100-107
Author(s):  
Jovid Ikromov
Keyword(s):  
South Asia ◽  
Central Asia ◽  
World Economy ◽  
Asian Countries ◽  
The West ◽  
Eurasian Continent ◽  
Central Asian ◽  
The World ◽  
Central Asian Countries

In this article, the place of Central Asia, particularly of Tajikistan, in the Eurasian continent has been examined. The slow and confident transfer of engine of the world economy from the West to the East and South increasing the role of the countries located between them. Located between Europe, Russia and South Asia, five Central Asian countries are interested in the development and participation in broader transcontinental trade and transit corridors connecting in all directions. Tajikistan has a unique opportunity to become a hub of trade and transit as it is located at the crossroads of growing ties between South and Central Asia.

Glacial and environmental changes over the last 60 000 years in the Polar Ural Mountains, Arctic Russia, inferred from a high‐resolution lake record and other observations from adjacent areas

Boreas ◽  
2018 ◽  
Vol 48 (2) ◽  
pp. 407-431 ◽  
Author(s):  
John Inge Svendsen ◽  
Lars Martin B. Færseth ◽  
Richard Gyllencreutz ◽  
Haflidi Haflidason ◽  
Mona Henriksen ◽  
...  
Keyword(s):  
High Resolution ◽  
Environmental Changes ◽  
Ural Mountains ◽  
Lake Record ◽  
Arctic Russia ◽  
Polar Ural

scholarly journals Comparison of the Impact of Global Climate Changes and Urbanization on Summertime Future Climate in the Tokyo Metropolitan Area

2012 ◽  
Vol 51 (8) ◽  
pp. 1441-1454 ◽  
Author(s):  
Sachiho A. Adachi ◽  
Fujio Kimura ◽  
Hiroyuki Kusaka ◽  
Tomoshige Inoue ◽  
Hiroaki Ueda
Keyword(s):  
Climate Change ◽  
Metropolitan Area ◽  
Global Climate Change ◽  
Temperature Increase ◽  
Climate Changes ◽  
Global Climate ◽  
Local Climate ◽  
Tokyo Metropolitan Area ◽  
Global Climate Changes ◽  
The Impact

AbstractIn this study, the impact of global climate change and anticipated urbanization over the next 70 years is estimated with regard to the summertime local climate in the Tokyo metropolitan area (TMA), whose population is already near its peak now. First, five climate projections for the 2070s calculated with the aid of general circulation models (GCMs) are used for dynamical downscaling experiments to evaluate the impact of global climate changes using a regional climate model. Second, the sensitivity of future urbanization until the 2070s is examined assuming a simple developing urban scenario for the TMA. These two sensitivity analyses indicate that the increase in the surface air temperature from the 1990s to the 2070s is about 2.0°C as a result of global climate changes under the A1B scenario in the Intergovernmental Panel on Climate Change’s Special Report on Emissions Scenarios (SRES) and about 0.5°C as a result of urbanization. Considering the current urban heat island intensity (UHII) of 1.0°C, the possible UHII in the future reaches an average of 1.5°C in the TMA. This means that the mitigation of the UHII should be one of the ways to adapt to a local temperature increase caused by changes in the future global climate. In addition, the estimation of temperature increase due to global climate change has an uncertainty of about 2.0°C depending on the GCM projection, suggesting that the local climate should be projected on the basis of multiple GCM projections.

Dynamical Downscaling for Assessment of the Climate in Ghana

2014 ◽  
Vol 9 (4) ◽  
pp. 412-421
Author(s):  
Masaru Inatsu ◽  
◽  
Tsubasa Nakayama ◽  
Yoshie Maeda ◽  
Hirotaka Matsuda ◽  
...  
Keyword(s):  
Dynamical Downscaling ◽  
West African Monsoon ◽  
Satellite Observation ◽  
Atmospheric Model ◽  
West African ◽  
Present Climate ◽  
The West ◽  
Local Climate ◽  
Regional Atmospheric Model ◽  
Spatio Temporal

Dynamical downscaling (DDS), in which a regional atmospheric model (RAM) experiment nested into coarser-resolution data provides a spatio-temporal fine dataset for a particular region, was performed to assess the present climate in Ghana. The DDS successfully evaluated realistic seasonal march and inter-annual variability in rainfall, in comparison with gauge and satellite observation. The DDS also indicated that land-lake and land-sea circulation interacted with the West African monsoon likely characterized the local climate in Ghana.

scholarly journals Evidence from the Rio Bayo valley on the extent of the North Patagonian Icefield during the Late Pleistocene–Holocene Transition

2006 ◽  
Vol 65 (1) ◽  
pp. 70-77 ◽  
Author(s):  
Neil F. Glasser ◽  
Stephan Harrison ◽  
Susan Ivy-Ochs ◽  
Geoffrey A.T. Duller ◽  
Peter W. Kubik
Keyword(s):  
Late Pleistocene ◽  
Climatic Conditions ◽  
Optically Stimulated Luminescence ◽  
Luminescence Dating ◽  
Age Dating ◽  
Outlet Glacier ◽  
Geomorphological Mapping ◽  
Cosmogenic Nuclide ◽  
The North ◽  
Exposure Age

AbstractThis paper presents data on the extent of the North Patagonian Icefield during the Late Pleistocene–Holocene transition using cosmogenic nuclide exposure age and optically stimulated luminescence dating. We describe geomorphological and geochronological evidence for glacier extent in one of the major valleys surrounding the North Patagonian Icefield, the Rio Bayo valley. Geomorphological mapping provides evidence for the existence of two types of former ice masses in this area: (i) a large outlet glacier of the North Patagonian Icefield, which occupied the main Rio Bayo valley, and (ii) a number of small glaciers that developed in cirques on the slopes of the mountains surrounding the valley. Cosmogenic nuclide exposure-age dating of two erratic boulders on the floor of the Rio Bayo valley indicate that the outlet glacier of the icefield withdrew from the Rio Bayo valley after 10,900 ± 1000 yr (the mean of two boulders dated to 11,400 ± 900 yr and 10,500 ± 800 yr). Single-grain optically stimulated luminescence (OSL) dating of an ice-contact landform constructed against this glacier indicates that this ice mass remained in the valley until at least 9700 ± 700 yr. The agreement between the two independent dating techniques (OSL and cosmogenic nuclide exposure age dating) increases our confidence in these age estimates. A date obtained from a boulder on a cirque moraine above the main valley indicates that glaciers advanced in cirques surrounding the icefield some time around 12,500 ± 900 yr. This evidence for an expanded North Patagonian Icefield between 10,900 ± 1000 yr and 9700 ± 700 yr implies cold climatic conditions dominated at this time.

David Barker, Buruli ulcer and the epidemiology of a neglected tropical disease

2015 ◽  
Vol 6 (5) ◽  
pp. 425-427
Author(s):  
D. I. W. Phillips
Keyword(s):  
Role Model ◽  
Research Council ◽  
Medical Research Council ◽  
Buruli Ulcer ◽  
The West ◽  
Local Climate ◽  
Disease Patterns ◽  
Research And Teaching ◽  
International Reputation ◽  
The 1960S

In 1969, David Barker, his wife and four children moved to Uganda to work at Makerere Medical School in the capital Kampala. During the 1960s, Makerere had become a research and teaching centre with an international reputation based on the work of Trowell, Burkitt, Hutt and many others who had pioneered studies explaining the disease patterns in the West Nile area on the basis of the local climate, nutrition and lifestyle. David Barker was funded by the Medical Research Council to carry out research on a poorly understood disease, Buruli ulcer, joining Scottish surgeon Wilson Carswell, who was later to achieve fame as the role model for Dr Garrigan in Giles Foden’s novel The Last King of Scotland.

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