Impact of Dust and Temperature on Primary Productivity in Late Miocene Oceans DOI Creative Commons
Quentin Pillot, Anta‐Clarisse Sarr, Yannick Donnadieu

et al.

Paleoceanography and Paleoclimatology, Journal Year: 2025, Volume and Issue: 40(1)

Published: Jan. 1, 2025

Abstract Most of the primary productivity in ocean comes from phytoplankton, and is impacted, among other things, by amount nutrients available, as well temperature. The Late Miocene Pliocene were marked global aridification, linked to emergence large deserts, likely increasing input dust thus into ocean. There was also a decrease temperature during this period, decline atmospheric CO 2 concentration. objective study explore sensitivity levels on oceans under boundary conditions. Here we used simulations performed with coupled ocean‐atmosphere model IPSL‐CM5A2 its marine biogeochemistry component PISCES paleogeography. Our results show that an increase produces quasi‐generalized productivity, associated nutrient limitation. This leads deficits some areas, such coastlines Eastern Equatorial Pacific. lower water temperatures lead reduction productivity. mainly due supply resulting less intense remineralization. In addition, our change carbon export are highly heterogeneous spatially. Simulations combined sedimentary data suggesting link between cooling Biogenic Bloom Pliocene.

Language: Английский

The physical science basis of climate change empowering transformations, insights from the IPCC AR6 for a climate research agenda grounded in ethics DOI Creative Commons
Valérie Masson‐Delmotte

PLOS Climate, Journal Year: 2024, Volume and Issue: 3(8), P. e0000451 - e0000451

Published: Aug. 5, 2024

Language: Английский

Citations

5
Covalent Porous Catalysts for Electrochemical Reduction of CO2 DOI Creative Commons
Shuanglong Lu,

Hongyin Hu,

Huimin Sun

et al.

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(10), P. 5744 - 5769

Published: Jan. 1, 2024

This article reviews different types of covalent porous catalysts for eCO2RR, including their design principles, the latest progress and structure–activity relationships reported in recent literature.

Language: Английский

Citations

4
Continuous sterane and phytane δ13C record reveals a substantial pCO2 decline since the mid-Miocene DOI Creative Commons
Caitlyn R. Witkowski, Anna S. von der Heydt, Paul J. Valdes

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: June 18, 2024

Abstract Constraining the relationship between temperature and atmospheric concentrations of carbon dioxide ( p CO 2 ) is essential to model near-future climate. Here, we reconstruct values over past 15 million years (Myr), providing a series analogues for possible temperatures , from single continuous site (DSDP Site 467, California coast). We using sterane phytane, compounds that many phytoplankton produce then become fossilised in sediment. From 15.0-0.3 Myr ago, our reconstructed steadily decline 650 ± 150 280 75 ppmv, mirroring global decline. Using new range values, calculate average Earth system sensitivity equilibrium climate sensitivity, resulting 13.9 °C 7.2 per doubling respectively. These are significantly higher than IPCC warming estimations, consistent or some recent state-of-the-art models, with other proxy-based estimates.

Language: Английский

Citations

4
Southern Ocean control on atmospheric CO2 changes across late Pliocene Marine Isotope Stage M2 DOI Creative Commons
Suning Hou,

Leonie Toebrock,

Mart van der Linden

et al.

Climate of the past, Journal Year: 2025, Volume and Issue: 21(1), P. 79 - 93

Published: Jan. 14, 2025

Abstract. During the Pliocene, atmospheric CO2 concentrations (pCO2) were probably sometimes similar to today's, and global average temperature was ∼3 °C higher than preindustrial. However, relationships phasing between variability in climate pCO2 on orbital timescales are not well understood. Specifically, questions remain about nature of a lag relative benthic foraminiferal δ18O late Pliocene Marine Isotope Stage (MIS) M2 (3300 ka), which longer during Pleistocene. Here, we present multiproxy paleoceanographic reconstruction subtropical–subantarctic zone. New dinoflagellate cyst assemblage data combined with previously published sea surface reconstructions reveal past conditions, including latitudinal migrations subtropical front (STF) over at Ocean Drilling Program (ODP) Site 1168, offshore western Tasmania. We observe strong oceanographic STF glacial–interglacial timescales, especially interval (3320–3260 ka) across MIS M2. By providing tight independent age constraints from δ18O, find that, much more or local SST, tightly coupled variations northerly position deglaciation coincides generally low pCO2. postulate that Southern outgassing varied strongly this part accounted for

Language: Английский

Citations

0
Increased North African Dust Fluxes and Higher Productivity in the Eastern Equatorial Atlantic Ocean Linked to Stronger Trade Winds From About 2.7 Million Years ago DOI Creative Commons
Anya J. Crocker, Amy Jewell, Bryce Mitsunaga

et al.

Paleoceanography and Paleoclimatology, Journal Year: 2025, Volume and Issue: 40(1)

Published: Jan. 1, 2025

Abstract For at least the last 11 million years, North African landscape has repeatedly oscillated on astronomical timescales between dry dusty conditions of today and more humid, vegetated such as those documented for mid‐Holocene. These changes were primarily driven by expansion contraction tropical rainbelt in response to summer insolation. However, other mechanisms are needed explain temporal variability sensitivity humidity this rhythmic forcing. A main interval observed change is Pliocene‐Pleistocene transition (∼3.5–2.4 Ma) when Africa widely (but not universally) suggested have become drier dustier. Here we present new suborbitally resolved records surface ocean temperature, foraminiferal stable isotopes export productivity from Northwest margin eastern equatorial Atlantic Ocean compare them published records. We find strong coupling dust fluxes throughout our study interval, indicating sustained influence northeast trade winds transport, upwelling strength perhaps dust‐driven fertilization. attribute increases delivered NW strengthening steepening latitudinal temperature gradients associated with intensification Northern Hemisphere glaciation. Taken together evidence increased mid‐latitude westerlies time, results point invigoration large‐scale atmospheric circulation globally during intensified glacial periods transition.

Language: Английский

Citations

0
Late Pliocene evolution of hydroclimate, temperature and ecosystem in the Tianshui Basin, northeastern Tibetan Plateau, China: A multiproxy geochemical approach DOI
Tingjiang Peng,

Xiaomiao Li,

Hui Hua

et al.

Palaeogeography Palaeoclimatology Palaeoecology, Journal Year: 2025, Volume and Issue: 663, P. 112791 - 112791

Published: Feb. 1, 2025

Language: Английский

Citations

0
Phanerozoic icehouse climates as the result of multiple solid-Earth cooling mechanisms DOI Creative Commons
Andrew Merdith, Thomas M. Gernon, Pierre Maffre

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(7)

Published: Feb. 14, 2025

The Phanerozoic climate has been interrupted by two long "icehouse" intervals, including the current icehouse of last ~34 million years. While these cool intervals correspond to lower atmospheric CO2, it is unclear why CO2 levels fell, with hypotheses suggesting changes in degassing rates or modification silicate weathering through changing continental lithology paleogeography. Here, we construct an Earth System Model that integrates proposed cooling mechanisms detail. model can reproduce broad geologic record ice cap expansion, allowing us infer primary drivers long-term change. Our results indicate recent climates required a combination different acting simultaneously and were not driven single known process, potentially explaining icehouses have rarer than greenhouses over history.

Language: Английский

Citations

0
Collision, mantle convection and Tethyan closure in the Eastern Mediterranean DOI
Eivind O. Straume, Claudio Faccenna, T. W. Becker

et al.

Nature Reviews Earth & Environment, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Language: Английский

Citations

0
Importance of Longwave Radiative Forcing by Icy Clouds in Maintaining Miocene High‐Latitude Warmth DOI Creative Commons
Xiaoqing Liu, Adam Griffin, Müge Kömürcü

et al.

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(7)

Published: April 1, 2025

Abstract During the early‐to‐middle Miocene, global mean surface temperature (GMST) was approximately 8°C warmer than preindustrial, with a greater increase in polar regions tropics. However, existing Miocene simulations underestimate this warmth, particularly northern high latitudes. To address discrepancy, we investigate potential role of cloud phase. Using Community Earth System Model, conduct paleoclimate sensitivity study focused on modifying ice nucleation and phase partitioning schemes. These modifications GMST, strong rise latitudes muted increases are driven by enhanced longwave forcing, resulting from increased amounts water content, amplified vapor lapse rate feedbacks Arctic. Our highlights that improved parameterizations processes enhance models' capability to simulate high‐latitude warmth potentially other warm climates.

Language: Английский

Citations

0
Triple oxygen isotopes in eggshell carbonate as a proxy of late Cenozoic CO2 and primary productivity DOI Creative Commons
Vincent Hare,

Drake Yarian,

J. Tyler Faith

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

Citations

0