Global vegetation dynamics and latitudinal temperature gradients during the Mid to Late Miocene (15.97–5.33Ma)

Pound, Matthew J.; Haywood, Alan M.; Salzmann, Ulrich; Riding, James B.

doi:10.1016/j.earscirev.2012.02.005

Cited by 306 publications

(334 citation statements)

References 136 publications

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“…However, the observed cooling significantly precedes the establishment of large-scale glaciations in the Northern Hemisphere (Kleiven et al, 2002). The vegetation changes in the high latitudes (Pound et al, 2012) and particularly the general impoverishment of vegetation on Iceland (Denk et al, 2011) is in agreement with these findings and reveals a cool-temperate climate.…”

Section: The Palynologically Barren Interval (81-74 Ma)supporting

confidence: 62%

“…Reichart and Brinkhuis, 2003;Holzwarth et al, 2010), their low abundance during this interval in the Iceland Sea does not support substantial upwelling as suggested by Stabell and Koç (1996). Since selective degradation is excluded due to light to dark brown colors of cyst walls and no evidence of oxidative damage of Barssidinium and Cristadinium specimens encountered, the high paleoproductivity likely resulted from increased nutrient input due to enhanced chemical weathering during a much warmer and humid climate (Wan et al, 2009;Ma et al, 2011;Pound et al, 2012). The significant decline in the Shannon-Wiener index towards lowest Miocene values at~13.7 Ma likely depicts the impact of subsequent cooling during the MMCT (14.2-13.…”

Section: Discussionmentioning

confidence: 86%

“…Flower and Kennett, 1994;John et al, 2011;Paschier et al, 2011). This transition marked the onset of progressive long-term cooling both on land (Pound et al, 2012) and in sea (Zachos et al, 2008) that ultimately pushed the climate system into the bipolar glaciated mode of today. Superimposed, distinct short-term climate variability has been observed in marine records (Miller et al, 1991;Turco et al, 2001;Andersson and Jansen, 2003;Westerhold et al, 2005;John et al, 2011) and partly attributed to ice sheet growth on Antarctica and/or bottom-water cooling (Mi events sensu Miller et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

Schreck

Méheust

Stein

et al. 2013

Marine Micropaleontology

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The present study on ODP Leg 151 Hole 907A combines a detailed analysis of marine palynomorphs (dinoflagellate cysts, prasinophytes, and acritarchs) and a low-resolution alkenone-based sea-surface temperature (SST) record for the interval between 14.5 and 2.5 Ma, and allows to investigate the relationship between palynomorph assemblages and the paleoenvironmental evolution of the Iceland Sea. A high marine productivity is indicated in the Middle Miocene, and palynomorphs and SSTs both mirror the subsequent long-term Neogene climate deterioration. The diverse Middle Miocene palynomorph assemblages clearly diminish towards the impoverished assemblages of the Late Pliocene; parallel with a somewhat gradual decrease of SSTs being as high as 20°C at~13.5 Ma to around 8°C at~3 Ma. Superimposed, palynomorph assemblages not only reflect Middle to Late Miocene climate variability partly coinciding with the short-lived global Miocene isotope events (Mi-events), but also the initiation of a proto-thermohaline circulation across the Middle Miocene Climate Transition, which led to increased meridionality in the Nordic Seas. Last occurrences of species cluster during three events in the Late Miocene to Early Pliocene and are ascribed to the progressive strengthening and freshening of the proto-East Greenland Current towards modern conditions. A significant high latitude cooling between 6.5 and 6 Ma is depicted by the supraregional "Decahedrella event" coeval with lowest Miocene productivity and a SST decline. In the Early Pliocene, a transient warming is accompanied by surface water stratification and increased productivity that likely reflects a high latitude response to the global biogenic bloom. The succeeding crash in palynomorph accumulation, and a subsequent interval virtually barren of marine palynomorphs may be attributed to enhanced bottom water oxygenation and substantial sea ice cover, and indicates that conditions seriously affecting marine productivity in the Iceland Sea were already established well before the marked expansion of the Greenland Ice Sheet at 3.3 Ma.

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Section: The Palynologically Barren Interval (81-74 Ma)supporting

confidence: 62%

Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

Schreck

Méheust

Stein

et al. 2013

Marine Micropaleontology

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“…The Miocene climate exhibited marked changes including the Mid-Miocene Climatic Optimum (MMCO, *15-17.0 Ma [2]) during which temperatures were inferred to be *3-8°C higher than preindustrial level [3,4]. The mechanisms leading to the MMCO are still debated [2], but evidence points to an increase in the concentration of atmospheric CO 2 [4].…”

Section: Introductionmentioning

confidence: 99%

Lake geochemistry reveals marked environmental change in Southwest China during the Mid Miocene Climatic Optimum

Lebreton-Anberrée

et al. 2016

Science Bulletin

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The Mid-Miocene Climatic Optimum (MMCO; *15-17 Ma) was one of the short-term climatic warm events that punctuated the Cenozoic long-term cooling trend. Because there are very few terrestrial records of this event, most of our understanding comes from marine cores. In this report, we first present new palaeomagnetic data that revises the dating of our 400 m-thick lacustrine section in Wenshan (Yunnan), previously thought to be Late Miocene. These new data suggest an older age, ca. 15.2-16.5 Ma, coinciding with the MMCO. We measured d 13 C on bulk organic matter (d 13 C org ), total organic carbon (TOC), total nitrogen (TN) and C/N ratios at a high sample resolution to: (1) reconstruct the palaeoenvironmental changes in the lake catchment area, and (2) infer mechanisms responsible for these changes. Our results show that all four geochemical parameters demonstrate that a strong environmental change occurred around the middle of the section, shortly after the C5Cn/C5Br geomagnetic reversal and the Early/Middle Miocene boundary at 15.97 Ma. We propose that the environmental shift may be due to a combination of a change in climate, which became cooler, together with a change in organic matter cycling within the lake. This study provides a new insight into the MMCO and demonstrates that although the MMCO was generally a warm event, it was also a time of climatic instability and abrupt environmental changes.Keywords Yunnan Á Mid-Miocene Climatic Optimum Á Bulk organic carbon isotopes (d 13 C org ) Á C/N ratio Á TOC Electronic supplementary material The online version of this article

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“…4) were based on Pound et al (2012), Wolfe (1985) and Morley (2011). The study by Pound et al (2012) (Kaplan, 2001), while Wolfe (1985) uses the classification scheme described in Wolfe (1979).…”

Section: Global Vegetationmentioning

confidence: 99%

Boundary conditions for the Middle Miocene Climate Transition (MMCT v1.0)

Frigola¹,

Prange²,

Schulz³

2017

Preprint

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Global vegetation dynamics and latitudinal temperature gradients during the Mid to Late Miocene (15.97–5.33Ma)

Cited by 306 publications

References 136 publications

Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

Lake geochemistry reveals marked environmental change in Southwest China during the Mid Miocene Climatic Optimum

Boundary conditions for the Middle Miocene Climate Transition (MMCT v1.0)

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