AbstractMacroalgae aquaculture ecosystems have been increasingly recognized as coastal biogeochemical hotspots of air–sea net ecosystem carbon dioxide (CO2) exchange; however, their roles in regulating the temporal variability of net ecosystem methane (CH4) exchange (NME) receive little attention mainly due to very limited data availability. Here, we applied the eddy covariance (EC) technique to acquire ...
AbstractThe biological carbon pump (BCP) plays a critical role in sequestering atmospheric CO2 into the deep ocean; however, the influence of fine-scale oceanic processes, encompassing mesoscale and submesoscale features, on basin-scale carbon export remains poorly understood. Using a high-resolution physical-biogeochemical model and Biogeochemical-Argo (BGC-Argo) observations in the Subtropical Countercurrent ...
AbstractThe biological carbon pump (BCP) transfers CO2 from the surface ocean to depth, helping regulate atmospheric CO2 and accounting for roughly one-third of glacial–interglacial CO2 changes. Its strength is widely estimated from satellite-based relationships between net primary production (NPP) and export efficiency, but these approaches cannot distinguish organic matter rapidly recycled near ...
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....
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