scholarly journals Mercury in Hair of Mammoth and Other Prehistorical Mammals as a Proxy of Hg Level in the Environment Associated with Climate Changes

2020 ◽  
Vol 10 (23) ◽  
pp. 8664
Author(s):  
Stella Eyrikh ◽  
Gennady Boeskorov ◽  
Tatyana Serykh ◽  
Marina Shchelchkova ◽  
Tatyana Papina
Keyword(s):  
Climate Changes ◽  
Global Climate ◽  
Ice Core ◽  
Ice Age ◽  
Global Climate Changes ◽  
First Results ◽  
Thawing Permafrost ◽  
Steppe Bison ◽  
Dust Load

The paper presents the first results of Hg determination in the hair of prehistorical animals (woolly mammoth, steppe bison, and woolly rhino). Hair of prehistorical mammals can be used as an archive that preserves changes of environmental pollution at the paleoscale. The aim of our study was to assess the levels of Hg exposure of ancient animals and to understand whether Hg concentration in hair could be used as a proxy indicating changes of mercury levels in the environment following global climate changes. We assessed changes of Hg exposure recorded in hairs of seven specimens of mammoth fauna mammals that inhabited the Yakutia region in the period from 45 to 10 ka yr BP. Hg concentrations in hair varied from 0.017 to 0.177 µg/g; the lowest Hg concentration were determined in older specimens (45–33 kyr yr BP). The two highest concentrations belonged sample from the Last Glacial Maximum and the Karginian interstadial (57–24 kyr BP) periods. Our hypothesis is the increase of Hg concentrations in hair reflecting environmental Hg level might be forced by high dust load in cold periods and thawing permafrost in warm climatic periods. Long-term variations of Hg level recovered from Ice Age animals’ hair correlate with Hg profiles of concentration and deposition reconstructed from the Antarctica ice core.

scholarly journals An ice core record of near-synchronous global climate changes at the Bølling transition

2014 ◽  
Vol 7 (6) ◽  
pp. 459-463 ◽  
Author(s):  
Julia L. Rosen ◽  
Edward J. Brook ◽  
Jeffrey P. Severinghaus ◽  
Thomas Blunier ◽  
Logan E. Mitchell ◽  
...  
Keyword(s):  
Climate Changes ◽  
Global Climate ◽  
Ice Core ◽  
Global Climate Changes ◽  
Ice Core Record

scholarly journals Agriculture Adaptation to Consequences of Global Climate Changes

2021 ◽  
Vol 18 (2) ◽  
pp. 13-20
Author(s):  
D. G. Galkin
Keyword(s):  
Climate Change ◽  
Agricultural Production ◽  
Climate Changes ◽  
Greenhouse Gas Emission ◽  
Traditional Approach ◽  
Global Climate ◽  
Global Climate Changes ◽  
Change Impact ◽  
Agriculture Development

The goal of the article is to work out recommendations aimed at providing sustainability of agriculture development on the level of national economy in conditions of changing climate. The agriculture development within the frames of traditional approach can be studied in two aspects: as a sector subjected to the global climate change impact; as a sector promoting climate change due to greenhouse gas emission. The authors showed that in regard to present trends scientific recommendations aimed at agriculture adaptation to climate changes are the most significant for Russia. On the basis of provided concepts they identified key lines in the said adaptation: to develop innovation connected with adaptation to consequences of climate changes; to upgrade the system of agro-insurance; to use methods of organic food production; to monitor and appraise adaptation of agriculture to climate changes; to introduce strategic planning of sustainable development and location of agricultural production. These lines should be realized on the basis of integrity, strategic orientation and scientific support of agricultural production. These lines can stabilize the level of key parameters of the sector in the long-term perspective.

scholarly journals Erratum: Corrigendum: An ice core record of near-synchronous global climate changes at the Bølling transition

2014 ◽  
Vol 7 (7) ◽  
pp. 547-547
Author(s):  
Julia L. Rosen ◽  
Edward J. Brook ◽  
Jeffrey P. Severinghaus ◽  
Thomas Blunier ◽  
Logan E. Mitchell ◽  
...  
Keyword(s):  
Climate Changes ◽  
Global Climate ◽  
Ice Core ◽  
Global Climate Changes ◽  
Ice Core Record

scholarly journals Impact of Holocene climate variability on lacustrine records and human settlements in South Greenland

2015 ◽  
Vol 11 (6) ◽  
pp. 5401-5438 ◽  
Author(s):  
T. Guillemot ◽  
V. Bichet ◽  
A. Simonneau ◽  
D. Rius ◽  
C. Massa ◽  
...  
Keyword(s):  
Climate Changes ◽  
Global Climate ◽  
Sediment Cores ◽  
Atomic Ratio ◽  
Ice Age ◽  
Flood Events ◽  
Human Settlements ◽  
Global Climate Changes ◽  
High Precipitation ◽  
Suitable Area

Abstract. Due to its sensitivity to climate changes, south Greenland is a particularly suitable area to study past global climate changes and their influence on locale Human settlements. A paleohydrological investigation was therefore carried out on two river-fed lakes: Lake Qallimiut and Little Kangerluluup, both located close to the Labrador Sea in the historic farming center of Greenland. Two sediment cores (QAL-2011 and LKG-2011), spanning the last four millennia, were retrieved and showed similar thin laminae, described by high magnetic susceptibility and density, high titanium and TOC / TN atomic ratio, and coarse grain size. They are also characterized either by inverse grading followed by normal grading or by normal grading only and a prevalence of red amorphous particles and lignocellulosic fragments, typical of flood deposits. Flood events showed similar trend in both records: they mainly occurred during cooler and wetter periods characterized by weaker Greenlandic paleo-temperatures, substantial glacier advances, and a high precipitation on the Greenlandic Ice Sheet and North Atlantic ice-rafting events. They can therefore be interpreted as a result of ice and snow-melting episodes. They occurred especially during rapid climate changes (RCC) such as the Middle to Late Holocene transition around 2250 BC, the Sub-boreal/Sub-atlantic transition around 700 BC and the Little Ice Age (LIA) between AD 1300 and AD 1900, separated by cycles of 1500 years and driven by solar forcing. These global RCC revealed by QAL-2011 and LKG-2011 flood events may have influenced Human settlements in south Greenland, especially the paleo-Eskimo cultures and the Norse settlement, and have been mainly responsible for their demise.

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.

Regional model assessments of fire risks under global climate changes

2006 ◽  
Vol 411 (2) ◽  
pp. 1485-1488 ◽  
Author(s):  
I. I. Mokhov ◽  
A. V. Chernokulsky ◽  
I. M. Shkolnik
Keyword(s):  
Climate Changes ◽  
Global Climate ◽  
Regional Model ◽  
Global Climate Changes
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