Step-wise change of Asian interior climate preceding the Eocene–Oligocene Transition (EOT)

Abels, Hemmo A.; Dupont‐Nivet, Guillaume; Xiao, Guoqiao; Bosboom, Roderic; Krijgsman, Wout

doi:10.1016/j.palaeo.2010.11.028

Cited by 147 publications

(144 citation statements)

References 43 publications

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“…Despite the long-term stability of δ 18 O pp and δ 18 O pp gradients, many sedimentary records in Central Asia indicate step-wise shifts into an increasingly arid climate through the Cenozoic (Abels et al, 2011;Bosboom et al, 2014a;Dupont-Nivet et al, 2007;Licht et al, 2014;Liu et al, 2014;Lu et al, 2010;Song et al, 2014;Zhang et al, 2013). The discrepancy between these records and our conclusion of approximately constant δ 18 O through time may be explained by two factors.…”

Section: Quantifying the Role Of Westerly Moisture Transportcontrasting

confidence: 78%

Role of the westerlies in Central Asia climate over the Cenozoic

Caves

Winnick

Graham

et al. 2015

Earth and Planetary Science Letters

169

137

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There remains substantial debate concerning the relative roles of tectonics and of global climate in pacing the evolution of aridity in Central Asia over the Cenozoic. Tibetan Plateau uplift, variable monsoonal strength, Paratethys retreat, and reduced moisture transport from the North Atlantic have all been hypothesized to drive aridity in Central Asia. Distinguishing between these mechanisms requires knowledge of moisture transport pathways to Central Asia through time. Presently, Central Asia receives recycled, high δ 18 O moisture that has been transported across Eurasia by the westerlies, while southern Tibet receives low δ 18 O moisture distilled by passage over the Himalaya. Here, we reconstruct the spatial distribution of oxygen isotopes in precipitation since the early Eocene, using a compilation of δ 18 O data from 2750 sedimentary carbonate samples. Across Asia, the spatial distribution of paleo-precipitation δ 18 O remains remarkably similar through time, with low δ 18 O values in the lee of the Himalaya in southern Tibet, constant, high δ 18 O values in Central Asia, and intermediate values on the central Plateau despite independent evidence for substantial changes in both topography and climate through time.These results suggest that a long-standing topographic feature has continuously blocked southerly moisture, and subsequent progressive uplift of the Tibetan Plateau has had little impact on Central Asian climate. In turn, southerly monsoonal moisture has never persistently extended northward of the central Plateau. As a result, the westerlies have remained the dominant moisture source in Central Asia since at least the early Eocene. Therefore, sedimentary aridity indicators in Central Asia, such as loess deposition, are controlled by the trans-Eurasian, westerly moisture flux rather than Tibetan Plateau uplift.

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Section: Quantifying the Role Of Westerly Moisture Transportcontrasting

confidence: 78%

Role of the westerlies in Central Asia climate over the Cenozoic

Caves

Winnick

Graham

et al. 2015

Earth and Planetary Science Letters

169

137

View full text Add to dashboard Cite

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“…Abels et al (2011) showed that the first phase was characterized by a distinct decrease in gypsum content relative to red mudstone at 36.6 Ma (at the top of chron C17n.1n) and that the second phase was characterized by a substantial increase in the clastic sedimentation rate at 34.7 Ma (at the base of chron C13r). Furthermore, Xiao et al (2010) demonstrated that the third phase of aridification was characterized by a major reduction in the thickness of the gypsum bed at 34.2 Ma (in the middle of chron C13r).…”

Section: Desertificationmentioning

confidence: 99%

Evolution and variability of the Asian monsoon and its potential linkage with uplift of the Himalaya and Tibetan Plateau

Tada

Zheng

Clift

2016

Prog. in Earth and Planet. Sci.

171

119

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Uplift of the Himalaya and Tibetan Plateau (HTP) and its linkage with the evolution of the Asian monsoon has been regarded as a typical example of a tectonic-climate linkage. Although this linkage remains unproven because of insufficient data, our understanding has greatly advanced in the past decade. It is thus timely to summarize our knowledge of the uplift history of the HTP, the results of relevant climate simulations, and spatiotemporal changes in the Indian and East Asian monsoons since the late Eocene. Three major pulses of the HTP uplift have become evident: (1) uplift of the southern and central Tibetan Plateau (TP) at ca. 40-35 Ma, (2) uplift of the northern TP at ca. 25-20 Ma, and (3) uplift of the northeastern to eastern TP at ca. 15-10 Ma. Modeling predictions suggest that (i) uplift of the southern and central TP should have intensified the Indian summer monsoon (ISM) and the Somali Jet at 40-35 Ma; (ii) uplift of the northern TP should have intensified the East Asian summer monsoon (EASM) and East Asian winter monsoon (EAWM), as well as the desertification of inland Asia at 25-20 Ma; and (iii) uplift of the northeastern and eastern TP should have further intensified the EASM and EAWM at 15-10 Ma.We tested these predictions by comparing them with paleoclimate data for the time intervals of interest. There are insufficient paleoclimate data to test whether the ISM and Somali Jet intensified with the uplift of the southern and central TP at 40-35 Ma, but it is possible that such uplift enhanced erosion and weathering that drew down atmospheric CO 2 and resulted in global cooling. There is good evidence that the EASM and EAWM intensified, and desertification started in inland Asia at 25-20 Ma in association with the uplift of the northern TP. The impact of the uplift of the northeastern and eastern TP on the Asian monsoon at 15-10 Ma is difficult to evaluate because that interval was also a time of global cooling and Antarctic glaciation that might also have influenced the intensity of the Asian monsoon.

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“…Eocene-Oligocene deposition in the Xining Basin (Dai et al, 2006) occurred primarily within playa and marginal lacustrine environments (Abels et al, 2011;Dupont-Nivet et al, 2007) that were limited in spatial extent. Clastic input and inferred aridity generally increase within the younger deposits.…”

Section: Guide Guide Basin Basinmentioning

confidence: 99%