scholarly journals Global Change Modulated Asian Inland Climate Since 7.3 Ma: Carbonate Manganese Records in the Western Qaidam Basin

2021 ◽  
Vol 9 ◽  
Author(s):  
Yudong Liu ◽  
Yibo Yang ◽  
Chengcheng Ye ◽  
Rongsheng Yang ◽  
Erwin Appel ◽  
...  
Keyword(s):  
High Latitude ◽  
Qaidam Basin ◽  
Global Climate ◽  
Regional Climate ◽  
Lacustrine Sediments ◽  
Regional Environment ◽  
Secular Evolution ◽  
Driving Mechanisms ◽  
Western Qaidam Basin ◽  
Redox Evolution

Late Cenozoic drying of the Asian inland has not only exerted a profound impact on the regional environment but also affected global climate as an important source of global atmospheric dust. Continuous and accurately dated sediment records from the Asian interior are pivotal to a better understanding of the evolutionary history of Asian inland drying and the associated driving mechanisms. In this study, we present a continuous record of climate change in the Asian interior spanning the past 7.3 Myr, reconstructed by the redox evolution of a paleolake in the western Qaidam Basin, NE Tibetan Plateau. The paleolake redox conditions are linked to the oxygen concentration of lake bottom water and lake level, and were revealed by the manganese (Mn) concentration in the carbonate fraction (leached by the diluted acetic acid) of the carbonate-rich lacustrine sediments retrieved from two drill-cores (SG-1 and SG-1b). The reconstructed regional climate in the western Qaidam Basin shows long-term fluctuations, consistent with the secular evolution of the coeval global climate, especially the sea surface temperature variation in the high latitude North Atlantic. Three transitions of the paleolake hydrochemical system occurred at 6.2, 5.3, and 2.6 Ma, with a short drying stage at 6.2–5.3 Ma and prolonged Quaternary drying since 2.6 Ma. We argue that drying of the Asia interior has been dominantly forced by global cooling, in particular, the high-latitude cooling of the Northern Hemisphere.

Clay minerals and isotopes of Pleistocene lacustrine sediments from the western Qaidam Basin, NE Tibetan Plateau

2018 ◽  
Vol 162 ◽  
pp. 382-390 ◽  
Author(s):  
Minghui Li ◽  
Shurui Sun ◽  
Xiaomin Fang ◽  
Chunhong Wang ◽  
Zhengrong Wang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Clay Minerals ◽  
Qaidam Basin ◽  
Lacustrine Sediments ◽  
Western Qaidam Basin ◽  
Ne Tibetan Plateau

Chronological and rock magnetic constraints on the transition of the Quaternary paleoclimate in the western Qaidam Basin, NE Tibetan Plateau

2021 ◽  
pp. 1-12
Author(s):  
Weilin Zhang ◽  
Tao Li ◽  
Xiaomin Fang ◽  
Tao Zhang ◽  
Maodu Yan ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Tibetan Plateau ◽  
Qaidam Basin ◽  
Lacustrine Sediments ◽  
Fine Sediments ◽  
Western Qaidam Basin ◽  
Salt Minerals ◽  
Climate Transition ◽  
Saline Minerals ◽  
Ne Tibetan Plateau

Abstract A closed Quaternary saline paleolake, currently still a lake and named Dalangtan after one of its largest sub-basins, has widely distributed sediments in the western Qaidam Basin, NE Tibetan Plateau. Lacustrine salt minerals and fine sediments from this paleolake provide an environmental record for investigating paleoclimatic evolution in the Asian interior. However, detailed continuous Pliocene–Quaternary paleoclimatic records are broadly lacking from the NE Tibetan Plateau owing to poor exposure of the outcrops in section. For this study, we performed a detailed magnetostratigraphic dating and rock magnetic analysis on a 590-m-long core from the SG-5 borehole in the western Qaidam Basin. The results demonstrate that the lacustrine sediments in the SG-5 borehole were deposited more than ~3.0 Ma. Saline minerals began to increase at 1.2 Ma, and the magnetic susceptibility (χ) also changed at that time; the percentage frequency-dependent magnetic susceptibility was relatively low and uniform throughout the whole core. These observations, combined with the χ, pollen, salt ion, and grain-size records from other boreholes, indicate that the western Qaidam Basin and the greater Asian interior had a significant climate transition at 1.2 Ma during an extreme drought.

High-frequency redox variations of the Eocene cyclic lacustrine sediments in the Yingxi area, western Qaidam Basin, China

2019 ◽  
Vol 174 ◽  
pp. 135-151 ◽  
Author(s):  
Qicai Jiang ◽  
Yongsheng Ma ◽  
Yingchu Shen ◽  
Rongtao Guo ◽  
Xiaoqiao Gao ◽  
...  
Keyword(s):  
High Frequency ◽  
Qaidam Basin ◽  
Lacustrine Sediments ◽  
Western Qaidam Basin ◽  
Yingxi Area

Late Plio-Pleistocene humidity fluctuations in the western Qaidam Basin (NE Tibetan Plateau) revealed by an integrated magnetic–palynological record from lacustrine sediments

2015 ◽  
Vol 84 (3) ◽  
pp. 457-466 ◽  
Author(s):  
Christian Herb ◽  
Andreas Koutsodendris ◽  
Weilin Zhang ◽  
Erwin Appel ◽  
Xiaomin Fang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Summer Monsoon ◽  
Qaidam Basin ◽  
Lacustrine Sediments ◽  
Winter Monsoon ◽  
The Tibetan Plateau ◽  
Arid Environments ◽  
Asian Winter Monsoon ◽  
Western Qaidam Basin ◽  
Dry Conditions

Deciphering the climatic evolution of the Tibetan Plateau region during the Plio-Pleistocene is hampered by the lack of continuous archives and proxy datasets indicative of moisture availability. Here we assess the suitability of magnetic susceptibility (χ) measured on lacustrine sediments as a paleohydrological proxy based on material from drill core SG-1 (2.69–0.08 Ma) from the western Qaidam Basin. Our assessment is based on directly comparing χ with theArtemisia/Chenopodiaceae (A/C) pollen ratio, which represents a sensitive, well-established proxy for moisture changes in arid environments. We find that higher and lower χ values represent drier and less dry conditions, respectively, for the Late Plio-Pleistocene. Less dry phases were likely caused by transiently increased influence of the westerlies and/or decreased influence of the Asian winter monsoon on glacial–interglacial time scales. An exception from this relationship is the interval between ~ 1.9 and 1.3 Ma, when the SG-1 χ record exhibits a 54 ka cyclicity, which may indicate summer monsoon influence on the Qaidam Basin during that time. After ~ 1.3 Ma, the summer monsoon influence may have ceased due to global cooling, with the consequence that the Asian winter monsoon and the westerlies exerted a stronger control on the hydrology of the Qaidam Basin.

Magnetostratigraphy of deep drilling core SG-1 in the western Qaidam Basin (NE Tibetan Plateau) and its tectonic implications

2012 ◽  
Vol 78 (1) ◽  
pp. 139-148 ◽  
Author(s):  
Weilin Zhang ◽  
Erwin Appel ◽  
Xiaomin Fang ◽  
Chunhui Song ◽  
Olaf Cirpka
Keyword(s):  
Tibetan Plateau ◽  
Accumulation Rate ◽  
Qaidam Basin ◽  
Sediment Accumulation ◽  
Lacustrine Sediments ◽  
Deep Drilling ◽  
Core Recovery ◽  
Western Qaidam Basin ◽  
Geomagnetic Polarity ◽  
Ne Tibetan Plateau

AbstractThe Qaidam Basin is the largest intermontane basin of the northeastern Tibetan Plateau and contains a continuous Cenozoic sequence of lacustrine sediments. A ~ 1000-m-deep drilling (SG-1) with an average core recovery of ~ 95% was carried out in the depocenter of the Chahansilatu playa (sub-depression) in the western Qaidam Basin, aimed to obtain a high-resolution record of the paleoenvironmental evolution and the erosion history. Stepwise alternating field and thermal demagnetization, together with rock magnetic results, revealed a stable remanent magnetization for most samples, carried by magnetite. The polarity sequence consisted of 16 normal and 15 reverse zones which can be correlated with chrons 1n to 2An of the global geomagnetic polarity time scale. Magnetostratigraphic results date the entire core SG-1 at ~ 2.77 Ma to ~ 0.1 Ma and yielded sediment accumulation rate (SAR) ranging from 26.1 cm/ka to 51.5 cm/ka. Maximum SARs occurred within the intervals of ~ 2.6–2.2 Ma and after ~ 0.8 Ma, indicating two episodes of erosion, which we relate to pulse tectonic uplift of the NE Tibetan Plateau with subsequent global cooling.

Late Pliocene–Quaternary evolution of redox conditions in the western Qaidam paleolake (NE Tibetan Plateau) deduced from Mn geochemistry in the drilling core SG-1

2013 ◽  
Vol 80 (3) ◽  
pp. 586-595 ◽  
Author(s):  
Yibo Yang ◽  
Xiaomin Fang ◽  
Erwin Appel ◽  
Albert Galy ◽  
Minghui Li ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Qaidam Basin ◽  
Lacustrine Sediments ◽  
Acid Leaching ◽  
Redox Conditions ◽  
Catchment Scale ◽  
Oxide Phases ◽  
Redox Evolution ◽  
Mn Concentrations

Manganese (Mn) in lake sediments reacts strongly to changes of redox conditions. This study analyzed Mn concentrations in oxides, carbonates, and bulk phases of the calcareous lacustrine sediments of a 938.5-m-long core (SG-1) taken from the western Qaidam Basin, well dated from 2.77 Ma to 0.1 Ma. Comparisons of extractions from diluted hydrochloric acid, acetic acid and citrate"bicarbonate"dithionite demonstrate that variations of Mn concentrations from acetic acid leaching (MnHOAc) are mostly responsible for Mn (II) fluctuations in the carbonate phase. Taking into account the relevant processes during weathering, transportation, deposition and post-deposition of Mn-bearing rocks, we conclude that Mn input from catchment weathering and paleolake redox condition provide the primary controls on variations in the Mn records of carbonate and oxide phases. We propose MnHOAc as a new sensitive indicator of paleolake redox evolution and catchment-scale climate change. The MnHOAc variations show a long-term upward decreasing trend, indicating a long-term decrease of Mn input from catchment weathering associated with increasing oxygen content in the paleolake bottom water. The great similarities of the MnHOAc record with other regional and global records suggest that paleolake redox changes and climatic drying in the Qaidam Basin may be largely related to global cooling.

scholarly journals Detailed Processes and Potential Mechanisms of Pliocene Salty Lake Evolution in the Western Qaidam Basin

2021 ◽  
Vol 9 ◽  
Author(s):  
Qingda Su ◽  
Hannah Riegel ◽  
Lisha Gong ◽  
Richard Heermance ◽  
Junsheng Nie
Keyword(s):  
Organic Carbon ◽  
Asian Summer Monsoon ◽  
Qaidam Basin ◽  
Lacustrine Sediments ◽  
Weight Ratio ◽  
Chinese Loess Plateau ◽  
Early Pleistocene ◽  
Organic Carbon Content ◽  
Chinese Loess ◽  
Western Qaidam Basin

Hyperarid climate and salty lakes prevail in the current Qaidam Basin, but this basin was once a large paleolake until the early Quaternary. However, its evolution history and relationship with climate and tectonics are still elusive. Here we present detailed stratigraphic descriptions combined with total organic carbon content and weight ratio of organic carbon to total nitrogen records from fluvio-lacustrine sediments in the western Qaidam Basin to infer how the lake evolved during the late Pliocene-early Pleistocene. These data reveal a drying trend since 3.3 Ma, which we attribute to low latitude forcing and/or local tectonic activities. However, this trend was interrupted during 2.84–2.48 Ma, in which climate wetting was observed. We attribute the climate wetting during 2.84–2.48 Ma to intensified East Asian summer monsoon as is documented by the Chinese Loess Plateau records. Halite and gypsum content increased dramatically after 2.5 Ma, indicating the formation of salty lake in the western Qaidam Basin. These data improve our understanding of the detailed processes of Qaidam aridification and its potential forcing mechanisms.

Regional Climate Scenarios for use in Nordic Water Resources Studies

2003 ◽  
Vol 34 (5) ◽  
pp. 399-412 ◽  
Author(s):  
M. Rummukainen ◽  
J. Räisänen ◽  
D. Bjørge ◽  
J.H. Christensen ◽  
O.B. Christensen ◽  
...  
Keyword(s):  
Water Resources ◽  
Climate Models ◽  
Global Climate ◽  
Regional Climate ◽  
Regional Climate Models ◽  
Climate Projections ◽  
Climate Scenarios ◽  
Soil Frost ◽  
Nordic Region ◽  
Regional Climate Projections

According to global climate projections, a substantial global climate change will occur during the next decades, under the assumption of continuous anthropogenic climate forcing. Global models, although fundamental in simulating the response of the climate system to anthropogenic forcing are typically geographically too coarse to well represent many regional or local features. In the Nordic region, climate studies are conducted in each of the Nordic countries to prepare regional climate projections with more detail than in global ones. Results so far indicate larger temperature changes in the Nordic region than in the global mean, regional increases and decreases in net precipitation, longer growing season, shorter snow season etc. These in turn affect runoff, snowpack, groundwater, soil frost and moisture, and thus hydropower production potential, flooding risks etc. Regional climate models do not yet fully incorporate hydrology. Water resources studies are carried out off-line using hydrological models. This requires archived meteorological output from climate models. This paper discusses Nordic regional climate scenarios for use in regional water resources studies. Potential end-users of water resources scenarios are the hydropower industry, dam safety instances and planners of other lasting infrastructure exposed to precipitation, river flows and flooding.

Sign in / Sign up

Export Citation Format

Share Document