Inception of a global atlas of sea levels since the Last Glacial Maximum

Quaternary Science Reviews, Journal Year: 2019, Volume and Issue: 220, P. 359 - 371

Published: Aug. 20, 2019

Determining the rates, mechanisms, and geographic variability of relative sea-level (RSL) change following Last Glacial Maximum (LGM) provides insight into sensitivity ice sheets to climate change, response solid Earth gravity field ice-mass redistribution, constrains statistical physical models used project future rise. To do so in a scientifically robust way requires standardized datasets that enable broad spatial comparisons minimize bias. As part larger goal develop unified, spatially-comprehensive post-LGM global RSL database, this special issue we provide synthesis regional data resulted from first ‘Geographic HOLocene SEA level (HOLSEA)’ meetings Mt Hood, Oregon (2016) St Lucia, South Africa (2017). The HOLSEA brought together researchers agree upon consistent protocol standardize, interpret, incorporate realistic uncertainties data. This ten geographical regions including new databases Atlantic Europe Russian Arctic revised/expanded Canada, British Isles, Netherlands, western Mediterranean, Adriatic, Israel, Peninsular Malaysia, Southeast Asia, Indian Ocean. In total, database derived includes 5634 (5290 validated) index (n = 3202) limiting points 2088) span ∼20,000 years ago present. Progress improving standardization has also been accompanied by advancements analytical methods infer patterns rates geological have spatially temporally sparse distribution geochronological elevational uncertainties. marks inception database.

Language: Английский

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Mapping Sea-Level Change in Time, Space, and Probability

Annual Review of Environment and Resources, Journal Year: 2018, Volume and Issue: 43(1), P. 481 - 521

Published: Aug. 3, 2018

Future sea-level rise generates hazards for coastal populations, economies, infrastructure, and ecosystems around the world. The projection of future relies on an accurate understanding mechanisms driving its complex spatio-temporal evolution, which must be founded history. We review current methodologies data sources used to reconstruct history change over geological (Pliocene, Last Interglacial, Holocene) instrumental (tide-gauge satellite alimetry) eras, tools project spatial temporal evolution sea level. summarize level near (through 2050), medium (2100), long (post-2100) terms. Using case studies from Singapore New Jersey, we illustrate ways in can constrain projections, how projections motivate development new research questions across relevant timescales.

Language: Английский

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Holocene seasonal temperature evolution and spatial variability over the Northern Hemisphere landmass

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Sept. 10, 2022

The origin of the temperature divergence between Holocene proxy reconstructions and model simulations remains controversial, but it possibly results from potential biases in seasonality or climate sensitivity models. Here we present an extensive dataset seasonal temperatures reconstructed using 1310 pollen records covering Northern Hemisphere landmass. Our indicate that both summer winter warmed early to mid-Holocene (~11-7 ka BP) then cooled thereafter, with significant spatial variability. Strong warming trend occurred mainly Europe, eastern North America northern Asia, which can be generally captured by is likely associated retreat continental ice sheets. subsequent cooling pervasively recorded except for Asia southeastern America, may reflect cross-seasonal impact decreasing insolation through climatic feedbacks, season not well reproduced challenge proposal proxies are main model-data discrepancies highlight critical feedbacks on changes, warrant closer attention future modelling.

Language: Английский

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Sea-level rise in Venice: historic and future trends (review article)

Natural hazards and earth system sciences, Journal Year: 2021, Volume and Issue: 21(8), P. 2643 - 2678

Published: Sept. 1, 2021

Abstract. The city of Venice and the surrounding lagoonal ecosystem are highly vulnerable to variations in relative sea level. In past ∼150 years, this was characterized by an average rate sea-level rise about 2.5 mm/year resulting from combined contributions vertical land movement rise. This literature review reassesses synthesizes progress achieved quantification, understanding prediction individual local level, with a focus on most recent studies. Subsidence contributed half historical Venice. current best estimate during observational period 1872 2019 based tide-gauge data after removal subsidence effects is 1.23 ± 0.13 mm/year. A higher – but more uncertain observed for years. Between 1993 2019, change +2.76 1.75 estimated subsidence. Unfortunately, satellite altimetry does not provide reliable within Lagoon. Local changes closely depend Adriatic Sea, which turn linked Mediterranean Sea. Water mass exchange through Strait Gibraltar its drivers currently constitute source substantial uncertainty estimating future deviations mean trend global-mean value. Regional atmospheric oceanic processes will likely contribute significant interannual interdecadal variability Venetian level magnitude comparable that past. On basis regional projections affecting trends Venice, range atmospherically corrected 2100 ranges between 32 62 cm RCP2.6 scenario 58 110 RCP8.5 scenario, respectively. plausible unlikely high-end strong ice-sheet melting yields 180 2100. Projections human-induced motions available, evidence demonstrates they have potential produce contribution exacerbating hazard posed climatically induced changes.

Language: Английский

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New relative sea-level insights into the isostatic history of the Western Mediterranean

Quaternary Science Reviews, Journal Year: 2018, Volume and Issue: 201, P. 396 - 408

Published: Oct. 29, 2018

Language: Английский

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Stability of the Antarctic Ice Sheet during the pre-industrial Holocene

Nature Reviews Earth & Environment, Journal Year: 2022, Volume and Issue: 3(8), P. 500 - 515

Published: July 12, 2022

Language: Английский

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Contributions of core, mantle and climatological processes to Earth’s polar motion

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(7), P. 705 - 710

Published: July 1, 2024

Abstract Earth’s spin axis slowly moves relative to the crust over time. A 120-year-long record of this polar motion from astronomical and more modern geodetic measurements displays interannual multidecadal fluctuations 20 40 milliarcseconds superimposed on a secular trend about 3 per year. is thought be driven by various surface interior processes, but how these processes operate interact produce observed signal remains enigmatic. Here we show that predictions made an ensemble physics-informed neural networks trained capture geophysical can explain main features motion. We find glacial isostatic adjustment mantle convection primarily account for trend. Mass redistribution surface—for example, ice melting global changes in water storage—yields relatively weak explains 90% variations. also core contribute both motion, either due variations torque at core–mantle boundary or dynamical feedback response mass changes. Our findings provide constraints interactions which observations are rare balance past century suggest operating between climate-related dynamics.

Language: Английский

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Meltwater Pulse 1A sea-level-rise patterns explained by global cascade of ice loss

Nature Geoscience, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 18, 2025

Language: Английский

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SELEN<sup>4</sup> (SELEN version 4.0): a Fortran program for solving the gravitationally and topographically self-consistent sea-level equation in glacial isostatic adjustment modeling

Geoscientific model development, Journal Year: 2019, Volume and Issue: 12(12), P. 5055 - 5075

Published: Dec. 4, 2019

Abstract. We present SELEN4 (SealEveL EquatioN solver), an open-source program written in Fortran 90 that simulates the glacial isostatic adjustment (GIA) process response to melting of Late Pleistocene ice sheets. Using a pseudo-spectral approach complemented by spatial discretization on icosahedron-based spherical geodesic grid, solves generalized sea-level equation (SLE) for spherically symmetric Earth with linear viscoelastic rheology, taking migration shorelines and rotational feedback sea level into account. The is gravitationally topographically self-consistent, since it considers gravitational interactions between solid Earth, cryosphere, oceans, accounts evolution Earth's topography changes level. can be employed study broad range geophysical effects GIA, including past relative variations induced sheets, time paleogeography ocean function Last Glacial Maximum, history variations, present-day geodetic signals observed Global Navigation Satellite Systems, gravity field detected satellite missions like GRACE (the Gravity Recovery Climate Experiment). “GIA fingerprints” constitute standard output SELEN4. Along source code, we provide supplementary document full account theory, some numerical results obtained from run, user guide. Originally, SELEN was conceived Giorgio Spada (GS) 2005 as tool students eager learn about has been first SLE solver made available community.

Language: Английский

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Climate pacing of millennial sea-level change variability in the central and western Mediterranean

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: June 29, 2021

Abstract Future warming in the Mediterranean is expected to significantly exceed global values with unpredictable implications on sea-level rise rates coming decades. Here, we apply an empirical-Bayesian spatio-temporal statistical model a dataset of 401 index points from central and western reconstruct change for past 10,000 years. We demonstrate that mean industrial-era have been faster than any other period since ~4000 years ago. further highlight previously unrecognized variability rates. In Common Era, this correlates occurrence major regional-scale cooling/warming episodes. Our data show stabilization during Late Antique Little Ice Age cold event, which interrupted general rising trend ~0.45 mm −1 characterized episodes Era. By contrast, event had only minor regional effects

Language: Английский

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