Publication Date:
2024-02-02
Description:
The Benguela Upwelling System (BUS) is the most productive of all eastern boundary upwelling ecosystems and it hosts a well-developed oxygen minimum zone. As such, the BUS is a potential hotspot for production of N2O, a potent greenhouse gas derived from microbially driven decay of sinking organic matter. Yet, the extent at which near-surface waters emit N2O to the atmosphere in the BUS is highly uncertain. Here we present the first high-resolution surface measurements of N2O across the northern part of the BUS (nBUS).We found strong gradients with a threefold increase in N2O concentrations near the coast as compared with open ocean waters. Our observations show enhanced sea-to-air fluxes of N2O (up to 1.67 nmol m−2 s−1) in association with local upwelling cells. Based on our data we suggest that the nBUS can account for 13% of the total coastal upwelling source of N2O to the atmosphere
Keywords:
CT; DATE/TIME; DEPTH, water; Gas chromatography (unfiltered); LATITUDE; LONGITUDE; M99; M99-track; Meteor (1986); Nitrous oxide, dissolved; Nitrous oxide, dry-air mole fraction; Sea surface salinity; Sea surface temperature; SOPRAN; Southeast Atlantic; Surface Ocean Processes in the Anthropocene; Temperature at equilibration; Underway cruise track measurements
Type:
Dataset
Format:
text/tab-separated-values, 92358 data points
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