A diatom record of CO2 decline since the late Miocene

Mejía, Luz María; Méndez-Vicente, Ana; Abrevaya, Lorena; Lawrence, K. T.; Ladlow, Caroline; Bolton, Clara T; Cacho, Isabel; Stoll, Heather

doi:10.1016/j.epsl.2017.08.034

Cited by 59 publications

(53 citation statements)

References 67 publications

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“…Here, we only consider simulations with 280 ppm CO 2 concentrations, given the little difference found by Marzocchi et al (2015) in the amount of monsoonal rainfall in the African region between 280 and 400 ppm. This is also in agreement with the suggested CO 2 concentrations below 300 ppm for the late Miocene (Bolton and Stoll, 2013;Mejia et al, 2017) and with the observed global cooling trends that have been associated with an ongoing decline in CO 2 concentrations during this time period (Herbert et al, 2016). A late Miocene paleogeography (Markwick, 2007) is used in the simulations, including an open Panama Gateway and a closed Bering Strait; see Marzocchi et al (2015) for further details and Paleoceanography 10.1029/2019PA003721 a full description of the model in its late Miocene setup and an assessment of its performance can also be found in (Bradshaw et al, 2012).…”

Section: Model Description and Experimental Designsupporting

confidence: 91%

Precessional Drivers of Late Miocene Mediterranean Sedimentary Sequences: African Summer Monsoon and Atlantic Winter Storm Tracks

Marzocchi

Flecker

Lunt

et al. 2019

Paleoceanog and Paleoclimatol

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Cyclic sedimentary patterns in the marine record of the Mediterranean Sea have been consistently correlated with orbitally-driven shifts in climate. Freshwater input driven by the African summer monsoon is thought to be the main control of such hydrological changes, where the runoff signal is transferred from the eastern to the western Mediterranean. The geological record from the Atlantic margin also contains precession-driven dilution cycles that have been correlated with the sedimentary sequences in the western and eastern Mediterranean despite the lack of a direct connection with the basin. In these regions, Atlantic winter storms have also been invoked to explain the wet phases. In the absence of seasonally-resolved proxy data, climate simulations at high temporal resolution can be used to investigate the drivers of Mediterranean hydrologic changes both on precessional and seasonal timescales. Here, we use the results of 22 ocean-atmosphere-vegetation simulations through an entire late Miocene precession cycle. These show that the African summer monsoon drives the hydrologic budget in the Eastern Mediterranean during precession minima, while the western marginal basins are generally dominated by local net evaporative loss. During precession minima, the western Mediterranean and the Atlantic margin are also influenced by enhanced winter precipitation from the Atlantic storm tracks. We can, therefore, identify two different moisture sources affecting the circum-Mediterranean area, characterized by the same phasing with respect to precession, but with opposite seasonality. This supports the interregional correlation of geological sections in these areas, as we show for the Messinian and speculate for other time periods.

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Section: Model Description and Experimental Designsupporting

confidence: 91%

Precessional Drivers of Late Miocene Mediterranean Sedimentary Sequences: African Summer Monsoon and Atlantic Winter Storm Tracks

Marzocchi

Flecker

Lunt

et al. 2019

Paleoceanog and Paleoclimatol

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“…(f) shows the variance in changes in paleotemperature between the Xining Basin and SSTs at a similar latitude, as well as the differences in terrestrial paleotemperatures between tectonically active and stable areas by subtracting the 5‐point running mean curves in (b) and (c) from that in (a), respectively. (g) Reconstructed CO 2 data compiled after Ji et al (): foraminifera δ 11 B (Badger et al, ; Foster et al, ), stomata (Beerling et al, ; Kürschner et al, ; Retallack, ; Stults et al, ; Van Der Burgh et al, ; Y. Q. Wang et al, ), paleosols (Breecker & Retallack, ; Ji et al, ), pennate diatoms (Mejía et al, ), and haptophyte algae (using alkenones; Bolton et al, ; Pagani et al, , Seki et al, , Y. Zhang et al, ). The black and pink dotted arrows in (g) show two decreasing CO 2 trends based on paleosols and diatoms, respectively.…”

Section: Paleoenvironmental Data Based On Gdgtsmentioning

confidence: 99%

“…As potentially intensifying mechanisms, the intensifications of the Asian winter monsoon, the biological pump, and the carbon cycle involving both terrestrial and deep-ocean carbon reservoirs have all been associated with the LMC event (Holbourn et al, 2018). Recently, reconstructed CO 2 concentrations (Figure 2g) based on coccolithophorids and pennate diatoms have shown a significant reduction during the Late Miocene (Bolton et al, 2016;Mejía et al, 2017), probably indicating that CO 2 played a more important role during the LMC. In spite of that, the different cooling amplitudes over land and sea during the LMC, at both high and low latitudes, need to be explained.…”

Section: Climate Change Driven By Uplift and Co 2 Levelsmentioning

confidence: 99%

“…CO 2 levels in this period exhibited some small volatility (Beerling & Royer, ; Ji et al, ), with an enigmatic decoupling between the climate, which was much warmer than todays (Pound et al, ; Zachos et al, ), and low atmospheric CO 2 concentrations (Pagani et al, ; Pearson & Palmer, ; Ruddiman, ). Recently, based on research using coccolithophorids and pennate diatoms, reconstructions have indicated a dramatic decrease in CO 2 concentrations during the Late Miocene, providing new evidence for the aforementioned enigma (Bolton et al, ; Bolton & Stoll, ; Mejía et al, ). New sea surface temperature (SST) data based on alkenone measurements have revealed a global Late Miocene cooling (LMC) event during the period ~7–5.4 Ma, which was coupled with a decline in atmospheric CO 2 concentrations (Herbert et al, ; Tzanova et al, ).…”

Section: Introductionmentioning

confidence: 99%

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A Late Miocene Terrestrial Temperature History for the Northeastern Tibetan Plateau's Period of Tectonic Expansion

Chen

Bai

Fang

et al. 2019

Geophysical Research Letters

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Key Points The uplift event (~10.5–8 Ma) revealed by glycerol dialkyl glycerol tetraethers temperature records from the Xining Basin is synchronous with regional drying The cooling amplitude over land is less than that over the ocean during the CO2‐dominated Late Miocene cooling event (~7–5.4 Ma) Tectonic forcing, rather than pCO2, dominated regional continental climate patterns and ecosystem transitions during the Late Miocene

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“…The asymmetric mean state seen between 6.5 and~5.7 Ma likely arose because of trade wind intensification and eastern equatorial Pacific thermocline cooling at the peak of the late Miocene cooling, amplified by glacio-eustatic driven ITF restriction and/or increased CAS shoaling. In turn, global precipitation patterns Paleoceanography and Paleoclimatology 10.1002/2017PA003245 may have undergone considerable perturbation in response to the oscillation in equatorial Pacific mean state, late Miocene SST changes (with associated changes in atmospheric and oceanic circulation) (Herbert et al, 2016) and implied decrease in atmospheric pCO 2 concentrations (Bolton & Stoll, 2013;Herbert et al, 2016;Mejía et al, 2017). Such perturbations in global precipitation may have played a role in bringing about the onset of widespread aridity and associated continental C 4 -grassland expansion during the late Miocene (Cerling et al, 1997;Christensen et al, 2017;Herbert et al, 2016;Lyle et al, 2008;Pagani et al, 1999;Uno et al, 2016).…”

Section: Equatorial Mean State and The Late Miocene Global Coolingmentioning

confidence: 99%

Deciphering the State of the Late Miocene to Early Pliocene Equatorial Pacific

Drury

Lee

Gray

et al. 2018

Paleoceanog and Paleoclimatol

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The late Miocene‐early Pliocene was a time of global cooling and the development of modern meridional thermal gradients. Equatorial Pacific sea surface conditions potentially played an important role in this global climate transition, but their evolution is poorly understood. Here we present the first continuous late Miocene‐early Pliocene (8.0–4.4 Ma) planktic foraminiferal stable isotope records from eastern equatorial Pacific Integrated Ocean Drilling Program Site U1338, with a new astrochronology spanning 8.0–3.5 Ma. Mg/Ca analyses on surface dwelling foraminifera Trilobatus sacculifer from carefully selected samples suggest that mean sea surface temperatures (SSTs) are ~27.8 ± 1.1°C (1σ) between 6.4 and 5.5 Ma. The planktic foraminiferal δ18O record implies a 2°C cooling between 7.2 and 6.1 Ma and an up to 3°C warming between 6.1 and 4.4 Ma, consistent with observed tropical alkenone paleo‐SSTs. Diverging fine‐fraction‐to‐foraminiferal δ13C gradients likely suggest increased upwelling between 7.1–6.0 and 5.8–4.6 Ma, concurrent with the globally recognized late Miocene Biogenic Bloom. This study shows that both warm and asymmetric mean states occurred in the equatorial Pacific during the late Miocene‐early Pliocene. Between 8.0–6.5 and 5.2–4.4 Ma, low east‐west δ18O and SST gradients and generally warm conditions prevailed. However, an asymmetric mean climate state developed between 6.5 and 5.7 Ma, with larger east‐west δ18O and SST gradients and eastern equatorial Pacific cooling. The asymmetric mean state suggests stronger trade winds developed, driven by increased meridional thermal gradients associated with global cooling and declining atmospheric pCO2 concentrations. These oscillations in equatorial Pacific mean state are reinforced by Antarctic cryosphere expansion and related changes in oceanic gateways (e.g., Central American Seaway/Indonesian Throughflow restriction).

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A diatom record of CO2 decline since the late Miocene

Cited by 59 publications

References 67 publications

Precessional Drivers of Late Miocene Mediterranean Sedimentary Sequences: African Summer Monsoon and Atlantic Winter Storm Tracks

Precessional Drivers of Late Miocene Mediterranean Sedimentary Sequences: African Summer Monsoon and Atlantic Winter Storm Tracks

A Late Miocene Terrestrial Temperature History for the Northeastern Tibetan Plateau's Period of Tectonic Expansion

Deciphering the State of the Late Miocene to Early Pliocene Equatorial Pacific

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