Tracking Improvement in Simulated Marine Biogeochemistry Between CMIP5 and CMIP6

Current Climate Change Reports, Journal Year: 2020, Volume and Issue: 6(3), P. 95 - 119

Published: Aug. 18, 2020

The changes or updates in ocean biogeochemistry component have been mapped between CMIP5 and CMIP6 model versions, an assessment made of how far these led to improvements the simulated mean state marine biogeochemical models within current generation Earth system (ESMs).The representation has progressed models. However, it remains difficult identify which are responsible for a given improvement. In addition, full potential terms interactions climate feedback poorly examined models.Increasing availability data, as well improved understanding underlying processes, allows advances components ESMs. present study scrutinizes extent ESMs 5th 6th phases Coupled Model Intercomparison Project (CMIP).

Language: Английский

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Impacts of Global Change on Ocean Dissolved Organic Carbon (DOC) Cycling

Frontiers in Marine Science, Journal Year: 2020, Volume and Issue: 7

Published: June 23, 2020

The marine dissolved organic carbon (DOC) pool is an important player in the functioning of ecosystems. DOC at interface between chemical and biological worlds, it fuels food webs, a major component Earth's system. Here, we review research showing impacts global change stressors on cycling, specifically: ocean warming stratification, acidification, deoxygenation, glacial sea ice melting, changed inflow from rivers, changing circulation upwelling, wet/dry deposition. A unified outcome future these production degradation not possible, due to regional differences impacts, but general patterns for each stressor are presented.

Language: Английский

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Changing atmospheric acidity as a modulator of nutrient deposition and ocean biogeochemistry

Science Advances, Journal Year: 2021, Volume and Issue: 7(28)

Published: July 7, 2021

Changing atmospheric acidity alters the delivery of nutrients to ocean and affects marine productivity ecology.

Language: Английский

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Dimethyl Sulfide‐Induced Increase in Cloud Condensation Nuclei in the Arctic Atmosphere

Global Biogeochemical Cycles, Journal Year: 2021, Volume and Issue: 35(7)

Published: June 18, 2021

Abstract Oceanic dimethyl sulfide (DMS) emissions have been recognized as a biological regulator of climate by contributing to cloud formation. Despite decades research, the climatic role DMS remains ambiguous largely because limited observational evidence for DMS‐induced condensation nuclei (CCN) enhancement. Here, we report concurrent measurement DMS, physiochemical properties aerosol particles, and CCN in Arctic atmosphere during phytoplankton bloom period 2010. We encountered multiple episodes new particle formation (NPF) growth when mixing ratios were both low high. The particles sizes at which they can act accelerated response an increase atmospheric DMS. Explicitly, sequential all relevant parameters (including source rate condensable vapor, Aitken mode hygroscopicity, CCN) was pronounced DMS‐derived NPF events. This field study unequivocally demonstrates previously unconfirmed roles into climate‐relevant size eventual activation.

Language: Английский

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The biogeochemistry of marine dimethylsulfide

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 4(6), P. 361 - 376

Published: June 7, 2023

Language: Английский

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CMEMS-LSCE: a global, 0.25°, monthly reconstruction of the surface ocean carbonate system

Earth system science data, Journal Year: 2024, Volume and Issue: 16(1), P. 121 - 160

Published: Jan. 10, 2024

Abstract. Observation-based data reconstructions of global surface ocean carbonate system variables play an essential role in monitoring the recent status carbon uptake and acidification, as well their impacts on marine organisms ecosystems. So far, ongoing efforts are directed towards exploring new approaches to describe complete better recover its fine-scale features. In this respect, our research activities within Copernicus Marine Environment Monitoring Service (CMEMS) aim develop a sustainable production chain observation-derived datasets at high space–time resolutions. As start long-term objective, study introduces 0.25∘ monthly reconstruction, namely CMEMS-LSCE (Laboratoire des Sciences du Climat et de l'Environnement) for period 1985–2021. The reconstruction derives six variables, including partial pressure CO2 (pCO2), total alkalinity (AT), dissolved inorganic (CT), pH, saturation states with respect aragonite (Ωar) calcite (Ωca). Reconstructing pCO2 relies ensemble neural network models mapping gridded observation-based provided by Surface Ocean ATlas (SOCAT). AT is estimated multiple-linear-regression approach, remaining resolved speciation given reconstructed AT; 1σ uncertainty associated these estimates also provided. Here, σ stands either standard deviation or each five other propagated through processing input uncertainty. We demonstrate that resolution product outperforms coarser spatial (1∘) thanks higher coverage nearshore description horizontal temporal variations across diverse basins, particularly coastal–open-ocean continuum. Product qualification confirms reliable root-mean-square from observations less than 8 %, 4 1 % relative mean pCO2, pH. average below 5 Ωar (Ωca), 2 CT, 0.4 pH values. Both model–observation misfit model indicate coastal reproduction still needs further improvement, wherein gradients representative sampling would be taken into account priority. This presents potential use case tracking state acidification. available https://doi.org/10.14768/a2f0891b-763a-49e9-af1b-78ed78b16982 (Chau al., 2023).

Language: Английский

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Between shells and seas: Effects of ocean acidification on calcification and osmoregulation in yellow clam (Amarilladesma mactroides)

Marine Environmental Research, Journal Year: 2025, Volume and Issue: 207, P. 107083 - 107083

Published: March 10, 2025

Language: Английский

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Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models

Biogeosciences, Journal Year: 2021, Volume and Issue: 18(12), P. 3823 - 3860

Published: June 29, 2021

Abstract. Characteristics and trends of surface ocean dimethylsulfide (DMS) concentrations fluxes into the atmosphere four Earth system models (ESMs: CNRM-ESM2-1, MIROC-ES2L, NorESM2-LM, UKESM1-0-LL) are analysed over recent past (1980–2009) future, using Coupled Model Intercomparison Project 6 (CMIP6) simulations. The DMS in historical simulations systematically underestimate most widely used observed climatology but compare more favourably against two observation-based datasets. better reproduce observations mid to high latitudes, as well polar westerlies marine biomes. resulting multi-model estimate contemporary global emissions is 16–24 Tg S yr−1, which narrower than observational-derived range 16 28 yr−1. disagree on sign trend flux from 1980 onwards, with showing an increase a decrease. At scale, these dominated by changes all models, irrespective air–sea parameterisation used. In turn, three consistently show that correlated productivity; however, productivity poorly constrained current generation ESMs, thus limiting predictive ability this relationship. contrast, consensus found among latitudes where increasing predominantly driven retreating sea-ice extent. However, magnitude between differs factor 3, 2.9 9.2 Gg decade−1 period 1980–2014, at low end satellite-derived analysis. Similar climate projections 21st century.

Language: Английский

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Climate Change Impacts on the Marine Cycling of Biogenic Sulfur: A Review

Microorganisms, Journal Year: 2022, Volume and Issue: 10(8), P. 1581 - 1581

Published: Aug. 5, 2022

A key component of the marine sulfur cycle is climate-active gas dimethylsulfide (DMS), which synthesized by a range organisms from phytoplankton to corals, and accounts for up 80% global biogenic emissions. The DMS starts with intracellular synthesis non-gaseous precursor dimethylsulfoniopropionate (DMSP), released water column various food web processes such as zooplankton grazing. This dissolved DMSP pool rapidly turned over microbially mediated conversion using two known pathways: demethylation (releasing methanethiol) cleavage (producing DMS). Some formed ventilated atmosphere, where it undergoes rapid oxidation contributes formation sulfate aerosols, potential affect cloud microphysics, thus regional climate. phase cycling complex, however, heterotrophs also contribute consumption newly DMS. Interestingly, due microbial other sinks photolysis, amount that enters atmosphere currently thought be relatively minor fraction total cycled through web-less than 10%. These are temperature, but response assemblages ocean warming poorly characterized, although bacterial degradation appears increase an in temperature. review will focus on impact climate change It likely vary across different biogeographical regions polar tropical. For example, oceans, communities associated dramatically during 21st century decline sea ice. At lower latitudes, corals form important source (P), shifts microbiome composition have been observed thermal stress alter cycle.

Language: Английский

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Promotion effects of alkali metals on iron molybdate catalysts for CO2 catalytic hydrogenation

Journal of Energy Chemistry, Journal Year: 2023, Volume and Issue: 85, P. 291 - 300

Published: June 30, 2023

Language: Английский

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