Middle to Late Miocene Eccentricity Forcing on Lake Expansion in NE Tibet

Wang, Zhixiang; Huang, Chunju; Licht, Alexis; Zhang, Rui; Kemp, David B.

doi:10.1029/2019gl082283

Cited by 23 publications

(22 citation statements)

References 57 publications

(130 reference statements)

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“…In addition to the suggested insolation forcing of the observed orbital changes, we also note that the weakening of the 100-kyr eccentricity cycles and intensification of the 41-kyr cycles (Figures 3a and S6) after ca. 7.7 Ma were consistent with the variations of global ice volume (Figure 3c; Levy et al, 2019;Westerhold et al, 2020), suggesting that Antarctic ice sheet size variations might be an additional or alternative forcing, as has been proposed before (Ao et al, 2016;Nie et al, 2017;Z. X. Wang et al, 2019.…”

Section: Discussionsupporting

confidence: 86%

Millennial Resolution Late Miocene Northern China Precipitation Record Spanning Astronomical Analogue Interval to the Future

Gao

Nie

Yan

et al. 2021

Geophysical Research Letters

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Asian monsoon precipitation heavily influences economic and societal activity for nearly half of the world population (Figure 1), and correct prediction of its future variations requires a complete understanding of its past variations and dynamic mechanisms. The modern climate is characterized by low orbital eccentricity (Laskar et al., 2004). Therefore, knowledge of Asian monsoon precipitation variability under astronomical settings similar to the present interglacial is crucial for understanding its future behavior. The closest interval that Earth's eccentricity was close to the current interglacial is at ca. 440-340 kyr ago of the late Quaternary (Loutre & Berger, 2003). Therefore, many studies focused on the late Quaternary period. For example, both millennial timescale and 100-kyr East Asian summer monsoon (EASM) changes have been detected from the loess sequences on the Chinese Loess Plateau (Fang et al., 1999;Sun et al., 2006Sun et al., , 2012. The dominant viewpoint for the millennial cycles in the late Quaternary is that they are sourced from Northern Hemisphere (NH) ice sheet variation which modulated strength of the Atlantic meridional overturning circulation, and this variation was transported to Asia via westerlies (Fang et al., 1999;Sun et al., 2012). For the 100 kyr cycles, they were normally attributed to be sourced from the variations of NH ice sheets (Sun et al., 2006(Sun et al., , 2015. However, 100-kyr cycles are weak in the East Asian speleothem oxygen isotope records (Cheng et al., 2016; Y. J. Wang et al., 2008), suggesting a dominant forcing of EASM by NH summer insolation at the orbital timescales.

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Section: Discussionsupporting

confidence: 86%

Millennial Resolution Late Miocene Northern China Precipitation Record Spanning Astronomical Analogue Interval to the Future

Gao

Nie

Yan

et al. 2021

Geophysical Research Letters

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“…In contrast, the Miocene Guide Basin in northeast Tibet exhibits highest lake levels between 11.4 and 10.5 Ma (Wang et al, 2018) and seems to follow the climate development of Western Eurasia and the Ili Basin. In this context, Wang et al (2018, 2019) discuss a substantial moisture supply by the westerlies to the Miocene Guide and Tianshui Basin, where lake level variations are predominantly eccentricity controlled. Contrary hypotheses exist about the Miocene hydroclimate of the Tarim Basin, south of the Ili Basin.…”

Section: Discussionmentioning

confidence: 99%

“…Outcrop images and geographic overview of Europe and Central Asia. (a) Modern topography of Europe and Central Asia with the position of the study area (Aktau, black dot) and the location of coeval paleoclimate records (numbered white dots, 1: Junggar Basin, Tang et al, 2011; 2: Junggar Basin, Sun, et al, 2010; 3: Junggar Basin, Charreau et al, 2012; 4: Tarim Basin, Sun et al, 2015; 5: Qaidam Basin, Song et al, 2014; 6: Qaidam Basin, Zhuang et al, 2011; 7: Tianshui Basin, Hui et al, 2011, Wang et al, 2019; 8: Guide Basin, Wang et al, 2018; 9: Tarim Basin, Zheng et al, 2015; 10: Lanzhou Basin, Y. Zhang, et al, 2014, 11: Ballato et al, 2010; and 12: Mourik et al, 2011). 2009Base map provided by GeoMapApp (www.geomapapp.org) / CC BY / CC BY (Ryan et al, 2009).…”

Section: Geographical Geological and Climatological Settingmentioning

confidence: 99%

Long‐Period Astronomical Forcing of Westerlies' Strength in Central Asia During Miocene Climate Cooling

Frisch

Voigt

Verestek

et al. 2019

Paleoceanog and Paleoclimatol

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The continental expression of global cooling during the Miocene Climate Transition in Central Asia is poorly documented, as the tectonically active setting complicates the correlation of Neogene regional and global climatic developments. This study presents new geochemical data (CaSO 4 content, carbonate δ 13 C and δ 18 O) from the endorheic alluvial-lacustrine Aktau succession (Ili Basin, southeast Kazakhstan) combined with findings from the previously published facies evolution. Time series analysis revealed long-eccentricity forcing of the paleohydrology throughout the entire succession, split into several facies-dependent segments. Orbital tuning, constrained by new laser ablation U-Pb dates and a preexisting magnetostratigraphy, places the succession in a 5.0 Ma long interval in the middle to late Miocene (15.6 to 10.6 Ma). The long-term water accumulation in the Ili Basin followed the timing of the Miocene Climate Transition, suggesting increased precipitation in the catchment area in response to climate cooling and stronger westerly winds. This was paced by minima of the 2.4 Ma eccentricity cycle, which favored the establishment of a discharge playa (~14.3 Ma) and a perennial lake (12.6 to 11.8 Ma). Furthermore, low obliquity amplitudes (nodes) caused a transient weakening of the westerlies at~13.7 to 13.5 Ma and at~12.7 Ma, resulting in negative hydrological budgets and salinization. Flooding of the windward Ili Basin coeval with aridification in the leeward basins suggests that the Tian Shan was a climate boundary already in the middle Miocene. Our results emphasize the impact of climate fluctuations on the westerlies' strength and thus on Central Asian hydrology. Plain Language Summary The global climate changed from an exceptional warm to a colder state in the middle Miocene epoch, representing a milestone in the evolution of today's climate. This study focuses on the, so far fragmentary, understanding of the Central Asian climate response to this global climate transition by investigating deposits of a former (salt) lake in the Ili Basin, southeast Kazakhstan. Regular sediment alternations represent cycles of low and high water level, overprinted by a long-term lake expansion. Time series analysis of climate sensitive geochemical and environmental parameters, together with the determination of absolute rock ages, enabled the identification of sedimentary cycles (405 ka and 1.2 Ma long), which are equivalent to climate influencing variations of the Earth's orbit and tilt angle. We conclude that water level maxima are linked to periods of low seasonal climate differences reoccurring every 405 ka. The lake expansion is caused by more precipitation due to strengthened westerly winds, in response to global cooling. Westerly winds were transiently weakened during periods of low variability of the Earth's tilt angle, promoting high evaporation and salinization. Our results emphasize the impact of climate change on the westerlies' strength and thus on Central Asian moisture supply.

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“…Marine records show that the lower frequency cycles such as the 405‐kyr eccentricity cycle are preferentially amplified in the carbon cycle during the Cenozoic (Kocken et al., 2019) and therefore may have affected the Xining Basin via CO 2 forcing. Additionally, teleconnections with the Antarctic ice sheets are proposed for the occurrence of 100‐kyr eccentricity cycles in various Miocene records across the northeastern Tibetan Plateau (Z. Wang et al., 2019) and the incipient Eocene ice sheets may have similarly modulated the paleoenvironment in the Xining Basin. Regardless of the explanation for the 400‐kyr cycles, our cyclostratigraphic analysis reveals no higher frequency cycles in the record before 40 Ma, even though the sampling resolution of ∼0.5 m corresponds to ∼17 kyrs (based on the average accumulation rate of 3 cm/kyr from Meijer et al., 2019) and should be enough to detect obliquity and 100‐kyr eccentricity cyclicities.…”

Section: Cyclostratigraphymentioning

confidence: 99%

Loess‐Like Dust Appearance at 40 Ma in Central China

Meijer

Dupont‐Nivet

Barbolini

et al. 2021

Paleoceanog and Paleoclimatol

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During wintertime, the Asian continent is characterized by a high atmospheric pressure system developing over southern Siberia and Mongolia. This semi-permanent high-pressure system known as the Siberian High drives strong northwesterly winds of the modern-day East Asian winter monsoon bringing cold and dry air from the Asian interior (Chang et al., 2006). During springtime, the Siberian High creates a strong meridional temperature contrast between cold air in the north and warmer air in the lower mid-latitudes that can result in frequent dust storms (Roe, 2009). These storms transport silt-sized material (with median grain-sizes of 20-60 µm) from the arid upwind areas to the Chinese Loess Plateau located downwind (J. Sun, 2002). This Plateau provides a unique record for studying the history of Asian aridification and atmospheric circulation (Maher, 2016). Furthermore, the transported mineral dust plays an important role in cooling the atmosphere by scattering solar radiation, promoting cloud formation and providing nutrients to the Pacific Ocean (

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Middle to Late Miocene Eccentricity Forcing on Lake Expansion in NE Tibet

Cited by 23 publications

References 57 publications

Millennial Resolution Late Miocene Northern China Precipitation Record Spanning Astronomical Analogue Interval to the Future

Millennial Resolution Late Miocene Northern China Precipitation Record Spanning Astronomical Analogue Interval to the Future

Long‐Period Astronomical Forcing of Westerlies' Strength in Central Asia During Miocene Climate Cooling

Loess‐Like Dust Appearance at 40 Ma in Central China

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