Driving force behind global cooling in the Cenozoic: an ongoing mystery

Lu, Huayu

doi:10.1007/s11434-015-0973-y

Cited by 13 publications

(3 citation statements)

References 34 publications

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“…The Taklimakan, Qaidam, and Badain Jaran deserts are located on the edges of northern and northeastern Tibetan Plateau (Figures a, and f) and have high Fe ox1 , Fe ox1 /Fe T , and Fe Oxides /Fe Total . This active neotectonic zone has long been associated with tectonically driven increased chemical weathering rates or climate change‐driven erosion rates since the late Cenozoic (Lu, ; Molnar et al, ; Raymo & Ruddiman, ; Zhang et al, ). With high erosion rates, abundant weathering materials are produced by rock denudation, glacial grinding, and river downing‐cutting in high mountain regions (Sun, ; West et al, ).…”

Section: Discussionmentioning

confidence: 99%

Iron Mineralogy and Speciation in Clay‐Sized Fractions of Chinese Desert Sediments

Zhao

Balsam

et al. 2017

JGR Atmospheres

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Iron released from Asian desert dust may be an important source of bioavailable iron for the North Pacific Ocean and thereby may stimulate primary productivity. However, the Fe species of the fine dusts from this source region are poorly characterized. Here we investigate iron species and mineralogy in the clay‐sized fractions (<2 μm), the size fraction most prone to long‐distance transport as dust. Samples were analyzed by sequential chemical extraction, X‐ray diffraction, and diffuse reflectance spectrometry. Our results show that Fe dissolved from easily reducible iron phases (ferrihydrite and lepidocrocite) and reducible iron oxides (dominated by goethite) are 0.81 wt % and 2.39 wt %, respectively, and Fe dissolved from phyllosilicates extracted by boiling HCl (dominated by chlorite) is 3.15 wt %. Dusts originating from deserts in northwestern China, particularly the Taklimakan desert, are relatively enriched in easily reducible Fe phases, probably due to abundant Fe contained in fresh weathering products resulting from the rapid erosion associated with active uplift of mountains to the west. Data about Fe speciation and mineralogy in Asian dust sources will be useful for improving the quantification of soluble Fe supplied to the oceans, especially in dust models.

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Section: Discussionmentioning

confidence: 99%

Iron Mineralogy and Speciation in Clay‐Sized Fractions of Chinese Desert Sediments

Zhao

Balsam

et al. 2017

JGR Atmospheres

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“…[22][23][24][25][26] This insolation varies on orbital time-scales, for example the 2.3 myr, 1.2 myr, 0.4 myr, ~100 kyr, 40 kyr and 20 kyr cycles of eccentricity, obliquity and precession [27][28][29] which have modulated the Asian palaeoclimate over a long period. [30][31][32][33][34][35][36][37] However, tectonic processes and their palaeoclimate effects occurred in addition to these insolation variations and have dedicated the long-term monsoon evolution. 38 Meanwhile, atmospheric changes in CO 2 concentration have been regarded as a key driver of long-term Earth surface cooling during the Cenozoic.…”

Section: Introductionmentioning

confidence: 99%

Formation and evolution of the Asian landscape during the Cenozoic

Lu,

Feng,

Lyu

et al. 2023

TIG

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<p>Asia has a unique set of landscapes, notably characterized by the highest plateau in the world, the strongest monsoon circulation, and an immense arid region. When and how this landscape was formed have long been investigated, but explanations remain elusive. In this paper, through a synthesis of both terrestrial and marginal marine sedimentary records and numerical simulation analyses, we propose that tectonic uplift/deformation and global cooling during the Cenozoic have controlled the evolution of Asian topography and climate, respectively, and, the Asian landscape. The Asian landscape has undergone three main stages of evolution, <i>viz</i>: development of low-relief topography and warm-dry climate during the Eocene (~50-34 Ma); emergence of high relief topography in the southwest, along with a diverse range of landforms elsewhere, associated with a warm monsoon-arid climate coupling system during the Oligocene to early Pliocene (34-3.0 Ma); and development of the typical Asian summer and winter monsoon circulation and present landscape since the late Pliocene, accompanied by significant global cooling. Our analyses reveal that the distribution of river catchments, flora, fauna and soils are controlled by tectonic uplift/deformation and palaeoclimate changes. Stepwise evolution of the Asian landscape since ~50 Ma was driven by tectonic deformation and global temperature changes, each of which may play different role(s) in landscape evolution. For instance, the India-Asia collision played a vital role in the formation of the Asian topographic configuration in the middle Eocene, which generated regional atmospheric circulation. On the other hand, global cooling during the late Pliocene played an important role in generating the modern-like Asian landscape including the rapid accumulation of loess deposits, strengthening of the Asian monsoon circulation, and the evolution of modern topography. To summarize, we broadly propose a three-stage history of landscape evolution in Asia during the Cenozoic. The detailed processes of Asian landscape evolution and the specific roles of tectonism and global temperature in controlling Asian landscapes and palaeoclimate evolution need to be further investigated.</p>

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“…10 Ma北半球高纬冰筏沉积的发现和~2.7 Ma大冰期的来临, 是引人注目的事件 [27] . 著名的高原隆升-风化吸收CO 2 -全球降温的假说 [36] , 提供了一个解释地球变冷的思路.…”

Section: 晚新生代地球气候是阶段性变冷的尤其是在unclassified