Geoengineered ocean vertical water exchange can accelerate global deoxygenation.

Feng, Yuming , Su, Bei and Oschlies, Andreas (2020) Geoengineered ocean vertical water exchange can accelerate global deoxygenation. Open Access Geophysical Research Letters, 47 (16). Art.Nr. e2020GL088263. DOI 10.1029/2020GL088263.

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Abstract

Ocean deoxygenation is a threat to marine ecosystems. We evaluated the potential of two ocean intervention technologies, i.e. “artificial downwelling (AD)” and “artificial upwelling (AU)”, for remedying the expansion of Oxygen Deficient Zones (ODZs). The model‐based assessment simulated AD and AU implementations for 80 years along the eastern Pacific ODZ. When AD was simulated by pumping surface seawater to the 178 ~ 457 m depth range of the ODZ, vertically integrated oxygen increased by up to 4.5% in the deployment region. Pumping water from 457 m depth to the surface (i.e. AU), where it can equilibrate with the atmosphere, increased the vertically integrated oxygen by 1.03%. However, both simulated AD and AU increased biological production via enhanced nutrient supply to the sea surface, resulting in enhanced export production and subsequent aerobic remineralization also outside of the actual implementation region, and an ultimate net decline of global oceanic oxygen.

Document Type: Article
Keywords: deoxygenation; geoengineering; artificial upwelling; artificial downwelling; Earth system model marine hypoxia
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2020GL088263
ISSN: 0094-8276
Related URLs:
Projects: Future Ocean, SFB754, SPP 1689
Date Deposited: 03 Aug 2020 07:23
Last Modified: 19 Nov 2020 14:31
URI: http://oceanrep.geomar.de/id/eprint/50244

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