N2O Emissions From the Northern Benguela Upwelling System
Abstract
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.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- March 2019
- DOI:
- 10.1029/2018GL081648
- Bibcode:
- 2019GeoRL..46.3317A
- Keywords:
-
- nitrous oxide;
- Benguela upwelling system;
- coastal upwelling;
- EBUS;
- trace gases