Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina)

Pappalardo, Marta; Richiano, Sebastián; Aguirre, Marina Laura; Sandstrom, Michael; Hearty, Paul J.; Austermann, Jacqueline; Castellanos, Ignacio; Raymo, Maureen E

doi:10.1038/s43247-020-00067-6

Cited by 10 publications

(43 citation statements)

References 71 publications

(115 reference statements)

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“…Considering 70 m of early Pliocene marine deposits measured in Ajaches, Lanzarote [5] and subtracting the approximately 40 m of the tectonic uplift from Tortonian to present, we obtain about 30 m of early Pliocene relative sea level. This result coincides with the global eustatic mean sea level from ca 5 My ago calculated at 28.4 ± 11.7 m ASL [15] (Figure 2(b)).…”

Section: Global Sea Level At Early Pliocenesupporting

confidence: 88%

“…These marine deposits extend parallel to the current coast for more than 50 km and their K/Ar ages are about 4.8 My [4]. If we compare this data to the value from the global mean sea level [15], they show a total stability of cen-International Journal of Geosciences tral Fuerteventura from the lower Pliocene to the present. This data has allowed us to quantify the influence of local tectonics in the interglacials that occurred during the last half a million years.…”

Section: Tectonic Stability Of Central Fuerteventura Islandmentioning

confidence: 82%

“…The Canaries are also far from any subduction zone that could produce uplifts on their coasts. Moreover, this eastern zone is in a far-field region in the model of Glacial Isostatic Adjustment (GIA) processes [14] [15] or effects of weight change by fusion of the distant Fenoscandian and Laurentian ice sheets, where the coasts would be subjected to Holocene uplift ( [16]: Figure 6). The remoteness in time and space to the ice-sheets is favourable in making tectonic stability visible.…”

Section: Situation With Respect To Global Modelsmentioning

confidence: 99%

“…using the contact between the shoreface and the foreshore or intertidal zone as a sea level indicator. Although South Africa's far-field south coast experienced low GIA ( [24]; see also Figure 5(a), [15]) and is tectonically stable, it requires a precisely measured MIS 11 sea level to 13 m ± 2 m ASL (corrected for tectonic uplift and GIA). This figure approximates to that previously deduced for the Bahamas and Bermuda, using a GIA model produced by the disappearance of ice on the North American ice sheets, with a theoretical result of ~6 m to 13 m ASL during the second half of MIS 11 [29].…”

Section: The Warmest Mid-pleistocene Interglacial or Mis 11mentioning

confidence: 99%

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Earth-Moon Barycentre Excursions and Anomalous Quaternary Sea Level Highstands

Meco¹,

Sendino²,

Lomoschitz³

et al. 2022

IJG

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Plate tectonics is driven by Earth-Moon barycentre shifts in the lower mantle. The eastern Canary Islands have geographic and geological conditions derived from the movements of the Central American plates. Some features of these islands are influenced by the rotation of the Earth from west to east in the evolution of the marine currents that surround them and the opening of the North Atlantic to the North Pole with little dependence of the glacial isostatic adjustment (GIA). In addition, their position with respect to the Tropic of Cancer and the African continent affect the north-south and east-west climatic change dynamics and their tectonic stability respectively. Dated lavas contain marine and aeolian deposits and some of the Pleistocene marine deposits indicate higher sea level in cooler circumstances, which is anomalous. Relating those marine deposits produced during the warmest interglacial, the last interglacial and the Holocene with their equivalents in the Southern Hemisphere, they reflect shifts in the barycentre. Thanks to Holocene radiocarbon, topographic and day length data and alkenone temperature, we describe a mechanism by which the oscillation of the Moon's inclination (and declination) reaches extreme values (14˚ and 34˚; about 4.9˚ more than current values) approximately every 1450 years. These values occur when there is a harmonic distortion in surface areas of the Earth's crust as response associated with oscillations in the displacements of the barycentre of the Earth-Moon

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Section: Global Sea Level At Early Pliocenesupporting

confidence: 88%

Section: Tectonic Stability Of Central Fuerteventura Islandmentioning

confidence: 82%

Section: Situation With Respect To Global Modelsmentioning

confidence: 99%

Section: The Warmest Mid-pleistocene Interglacial or Mis 11mentioning

confidence: 99%

See 2 more Smart Citations

Earth-Moon Barycentre Excursions and Anomalous Quaternary Sea Level Highstands

Meco¹,

Sendino²,

Lomoschitz³

et al. 2022

IJG

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“…There is a need to overcome this challenge to run simulations over longer time periods in the past (e.g., from the warm mid-Pliocene to the modern) or in higher spatiotemporal resolutions in order to accurately capture rapid paleoice-sheet variability and sea-level rise events observed in geological records (e.g., ice rafted debris events - Weber et al, 2014;Meltwater Pulse 1A event -Fairbanks, 1989;Deschamps et al, 2012;Brendryen et al, 2019), especially with the improving spatiotemporal resolution and extent of paleorecords (e.g., Khan et al, 2019;Rovere et al, 2020;Gowan et al, 2021). Furthermore, the present-day West Antarctic Ice Sheet (WAIS) sits atop fast-responding bedrock (e.g., Barletta et al, 2018;Lloyd et al, 2020;Powell et al, 2020) and is under the threat of rapid retreat in a warming climate (e.g., SROCC, 2019).…”

Section: Introductionmentioning

confidence: 99%

Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm

2022

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Abstract. Retreat and advance of ice sheets perturb the gravitational field, solid surface and rotation of the Earth, leading to spatially variable sea-level changes over a range of timescales O(100−6 years), which in turn feed back onto ice-sheet dynamics. Coupled ice-sheet–sea-level models have been developed to capture the interactive processes between ice sheets, sea level and the solid Earth, but it is computationally challenging to capture short-term interactions O(100−2 years) precisely within longer O(103−6 years) simulations. The standard forward sea-level modelling algorithm assigns a uniform temporal resolution in the sea-level model, causing a quadratic increase in total CPU time with the total number of input ice history steps, which increases with either the length or temporal resolution of the simulation. In this study, we introduce a new “time window” algorithm for 1D pseudo-spectral sea-level models based on the normal mode method that enables users to define the temporal resolution at which the ice loading history is captured during different time intervals before the current simulation time. Utilizing the time window, we assign a fine temporal resolution O(100−2 years) for the period of ongoing and recent history of surface ice and ocean loading changes and a coarser temporal resolution O(103−6 years) for earlier periods in the simulation. This reduces the total CPU time and memory required per model time step while maintaining the precision of the model results. We explore the sensitivity of sea-level model results to the model temporal resolution and show how this sensitivity feeds back onto ice-sheet dynamics in coupled modelling. We apply the new algorithm to simulate sea-level changes in response to global ice-sheet evolution over two glacial cycles and the rapid collapse of marine sectors of the West Antarctic Ice Sheet in the coming centuries and provide appropriate time window profiles for each application. The time window algorithm reduces the total CPU time by ∼ 50 % in each of these examples and changes the trend of the total CPU time increase from quadratic to linear. This improvement would increase with longer simulations than those considered here. Our algorithm also allows for coupling time intervals of annual temporal scale for coupled ice-sheet–sea-level modelling of regions such as West Antarctica that are characterized by rapid solid Earth response to ice changes due to the thin lithosphere and low mantle viscosities.

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Comparison and synthesis of sea-level and deep-sea temperature variations over the past 40 million years

Rohling

Foster

Gernon

et al. 2022

Preprint

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Global ice volume (sea level) and deep-sea temperature are key measures of Earth's climatic state. We synthesize evidence for multi-centennial to millennial ice-volume and deep-sea temperature variations over the past 40 million years, which encompass the early glaciation of Antarctica at ˜34 million years ago (Ma), the end of the Middle Miocene Climate Optimum, and the descent into the bipolar glaciation state from ˜3.4 Ma. We compare different sea-level and deep-water temperature reconstructions that are grounded in data to build a resource for validation of long-term numerical model-based approaches. We present: (a) a new ice-volume and deep-sea temperature synthesis for the past 5.3 million years; (b) a single template reconstruction of ice-volume and deep-sea temperature for the interval between 5.3 and 40 Ma; and (c) a discussion of uncertainties and limitations. We highlight key issues associated with glacial state changes in the geological record from 40 Ma to the present that require specific attention in further research. These include offsets between calibration-sensitive versus more thermodynamically guided deep-sea paleothermometry proxy measurements; a conundrum related to the magnitudes of sea-level and deep-sea temperature change at the Eocene-Oligocene transition at 34 Ma; a discrepancy in deep-sea temperature levels during the Middle Miocene between proxy reconstructions and model-based deconvolutions of deep-sea oxygen isotope data; and a hitherto unquantified non-linear reduction of glacial deep-sea temperatures through the past 3.4 million years toward a near-freezing deep-sea temperature asymptote, while sea level stepped down in a more linear manner.

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Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina)

Cited by 10 publications

References 71 publications

Earth-Moon Barycentre Excursions and Anomalous Quaternary Sea Level Highstands

Earth-Moon Barycentre Excursions and Anomalous Quaternary Sea Level Highstands

Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm

Comparison and synthesis of sea-level and deep-sea temperature variations over the past 40 million years

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