Orbitally-paced variations of water availability in the SE Asian Monsoon region following the Miocene Climate Transition

Heitmann, Emma O.; Ji, Shunchuan; Nie, Junsheng; Breecker, Daniel O.

doi:10.1016/j.epsl.2017.06.006

Cited by 16 publications

(10 citation statements)

References 49 publications

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“…Similarly, middle Miocene (14-10 Ma) lake expansion in Northeast Tibet displayed cyclic variations following~100 kyr cycles and weaker~41 kyr cycles (Wang et al, 2018). In contrast, Heitmann et al (2017) suggested that obliquity might have been the main forcing of moisture supply during this period, though this assessment is based on a thin (12 m thick) outcrop in the Tianshui basin covering just the interval from 13.7 to 13.2 Ma.…”

Section: Introductionmentioning

confidence: 93%

“…In the Chinese Loess Plateau, strong 400-kyr and weak~100-kyr signals in grain size and MS have been reported for most of the Pliocene: in the Lingtai red clay section (Sun et al, 2006), in the Chaona red clay section (Nie et al, 2008), and in the Shilou section (Anwar et al, 2015). In contrast, Heitmann et al (2017) suggested that obliquity might have been the main forcing of moisture supply during this period, though this assessment is based on a thin (12 m thick) outcrop in the Tianshui basin covering just the interval from 13.7 to 13.2 Ma. Earlier, late Miocene (8.5-7 Ma) lacustrine expansions in the Qaidam basin of North Tibet have been shown to be mainly controlled by~100 kyr cycles .…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Huang

Licht

et al. 2019

Geophysical Research Letters

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The East Asian summer monsoon (EASM) variability on orbital time scale has been extensively investigated in Quaternary loess and speleothems. However, EASM variability during pre‐Quaternary time remains poorly understood. Here we report a continuous upper Miocene cyclostratigraphic record from lake deposits of the Tianshui basin, Northeast Tibet, to reconstruct past variations of the regional hydrological cycle. Our results, combined with previously published cyclostratigraphic records from Northeast Tibet, show that regional lake expansion cycles have been consistently dominated by ~100‐kyr eccentricity forcing over most of the middle to late Miocene. These ~100 kyr cycles corroborate a significant forcing of the East Asian hydrological cycle by Antarctic ice sheet variations at that time. It is, however, unclear if this forcing affected EASM intensity or westerly derived moisture supply to the far east. Regardless of the nature of the main source of precipitation in Northeast Tibet during the Miocene, these results emphasize the existence of a strong teleconnection between Antarctic ice sheet modulations and the continental climate of Asia.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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

Wang

Huang

Licht

et al. 2019

Geophysical Research Letters

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“…The lack of obliquity signal in the Zhada Basin's δ 18 O carb record is consistent with our interpretation that high-frequency variation is controlled by direct irradiative heating of the plateau due to changes in daily insolation, which is dominated by 19 and 23 kyr periodicities. However, Miocene-Pleistocene records of the EAM found a direct link between variations in monsoon precipitation and obliquity (41 kyr) forcing (Heitmann et al, 2017;. Heitmann et al (2017) attribute changes in EAM circulation to variations in the cross-equatorial pressure gradient.…”

Section: Comparison Of Ism and Eam Forcing Mechanismsmentioning

confidence: 99%

“…The history and forcing mechanisms controlling the EAM are relatively well-established from records on the Chinese Loess Plateau (CLP). In the EAM domain, orbital cyclicity related to eccentricity (~100 and 400 kyr cycles), obliquity (~40 kyr cycles), and precession (19 and 23 kyr cycles) are noted in paleosol-loess deposits on the CLP (e.g., An et al, 2001;Clemens et al, 2008;Guo et al, 2002;Heitmann et al, 2017;Nie et al, 2014;Sun & An, 2005), in cave stalagmites in southern China (e.g., Cai et al, 2015;Cheng et al, 2016;Yuan et al, 2004), as well as in marine records (e.g., Clemens et al, 2008;Lisiecki & Raymo, 2005).…”

Section: 1029/2019pa003781mentioning

confidence: 99%

“…In addition to the role orbital forcing plays in monsoon circulation, changes in global ice-volume are also thought to influence the strength of the AMS during the late Miocene (Nie et al, 2017). For example, an increase in Southern Hemisphere ice volume has been linked to stronger AMS (including both ISM and EAM systems) circulation in both Cenozoic proxy records and climate models (An et al, 2011;Ao et al, 2016;Heitmann et al, 2017). In contrast, an increase in Northern Hemisphere ice volume is thought to weaken the AMS in response to a weakened land-sea pressure gradient (Heitmann et al, 2017, and references therein), a cooler North Atlantic, and possibly more snow cover on the Tibetan Plateau and in central Asia (see above).…”

Section: 1029/2019pa003781mentioning

confidence: 99%

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Orbital Forcing of Late Miocene–Early Pleistocene Environmental Change in the Zhada Basin, SW Tibetan Plateau

Saadeh

Saylor

Nie

et al. 2020

Paleoceanog and Paleoclimatol

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Mechanisms controlling the long‐ and short‐term variability of the Indian Summer Monsoon (ISM) and high‐elevation environmental change have largely been examined using low‐elevation or marine records with less emphasis on high‐elevation non‐marine records. We address this using a high‐resolution, long‐term record from upper Miocene–lower Pleistocene (~9.0–2.2 Ma) fluvio‐lacustrine strata in the Zhada Basin, southwestern Tibetan Plateau. Long‐term changes include the onset of lacustrine deposition, a decrease in mean grain size, and an increase in δ18Ocarb and δ13Ccarb values at ~6.0 Ma in response to basin closure following regional extension. This was followed by a return to palustrine/fluvial deposition, an increase in mean grain size, and a decrease in δ18Ocarb and δ13Ccarb values at ~3.5 Ma in response to tectonically driven long‐term ISM weakening. Spectral analysis reveals that high‐frequency variations in the δ18Ocarb record are dominated by 100 and ~20 kyr cycles from ~6.0–2.2 Ma. Wavelet and spectral analysis of the most densely sampled interval (4.23–3.55 Ma), tuned to the record of daily insolation (21 June at 35°N) confirms and highlights 100 and 20 kyr cycles. The tuned Pliocene δ18Ocarb record is coherent with the record of Northern Hemisphere insolation at precession periods but not at obliquity or eccentricity periods. Additionally, the tuned δ18Ocarb record is anticorrelated to the insolation record, indicating that stronger Northern Hemisphere insolation correlates with a stronger ISM. These results suggest that variations in daily insolation drove late Miocene–early Pleistocene high‐frequency ISM variability and environmental changes in the high‐elevation southwestern Tibetan Plateau.

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