AbstractProtactinium-231 (231Pa) is a particle-reactive radionuclide whose distribution integrates the effects of scavenging and ocean transport, making it a powerful tracer of particle dynamics and a potentially useful tracer for ocean circulation. We present the first global 231Pa inverse model that couples reversible scavenging by biogenic and lithogenic particles with two explicitly parameterized ...
AbstractSpring sea ice cover in the Barents-Kara Seas (BKS) exhibits notable interannual to decadal variability with spatial patterns distinct from winter. While previous studies suggest that internal climate variability dominates, the specific drivers remain to be identified. Using observations and model simulations, we reveal that atmospheric teleconnection from the western North Pacific accounts ...
AbstractClimate oscillations like the El Niño-Southern Oscillation and Pacific Decadal Oscillation significantly impact marine ecosystems. Traditionally, warm events are thought to suppress nutrient availability, reduce phytoplankton biomass, and change community structure. However, using two decades of field observations, remote sensing, Copernicus reanalysis, and Earth system modeling, we find very ...
AbstractAmong various proposed geoengineering methods, ocean alkalinity enhancement (OAE) stands out as a unique solution. By mimicking natural weathering processes, OAE can simultaneously enhance oceanic carbon uptake and mitigate ocean acidification. However, the full efficacy and potential side effects of OAE remain to be fully understood. To evaluate the efficacy of OAE through natural pathways ...
AbstractThe seasonal mixed layer pump (MLP) is an important pathway transporting organic carbon from the upper ocean to the ocean interior. While the MLP’s export role has been well-studied in high latitudes, its contribution in low latitudes remains uncertain. Here, we quantify the seasonal MLP-driven carbon export (EMLP) in low-latitude oceans using data from 26 biogeochemical profiling floats. ...
AbstractExcess anthropogenic carbon dioxide (CO2) emissions are a major driver of the ongoing climate crisis, underscoring the urgent need for scalable CO2 removal technologies Photosynthesis enhancement via microalgae represents a promising pathway. Here, we report a targeted CO2 removal strategy using a metal-organic framework (MOF), ZIF-8-NH2, assembled directly onto the surface of Spirulina platensis....
AbstractThe twilight zone plays a pivotal role in the oceanic carbon cycle because large amounts of organic carbon (OC) exported from the euphotic zone are degraded within this layer. However, the magnitude and variability of this remineralization flux remain incompletely understood, particularly across varying regional scales. Using a new particulate excess barium (PBaxs)-oxygen utilization rate transfer ...
AbstractBy disturbing the upper ocean, typhoons may play a crucial role in marine ecosystems. Previous studies mostly demonstrated surface chlorophyll a (Chl a) increase under typhoon conditions. By using satellite data and a physical–biogeochemical model, however, we show that approximately 49% of typhoons crossing the northern shelf of the South China Sea induced surface Chl a decline. Cases with ...
AbstractAquaculture sector growth is challenged by feed constraints, particularly the erratic availability and cost of fishmeal and oil from wild forage fish. Limited attention is given to the risks that forage fish shortfalls pose to aquaculture feed supplies. Here we develop a shortfall impact model to investigate the effects of varying forage fish supply scenarios on global fed aquaculture. Results ...
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