Does export production measure transient changes of the biological carbon pump’s feedback to the atmosphere under global warming?.

Koeve, Wolfgang , Kähler, Paul and Oschlies, Andreas (2020) Does export production measure transient changes of the biological carbon pump’s feedback to the atmosphere under global warming?. Open Access Geophysical Research Letters, 47 (22). Art.Nr. e2020GL089928. DOI 10.1029/2020GL089928.

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Abstract

In a widely‐held conception, the biological carbon pump (BCP) is equal to the export of organic matter out of the euphotic zone. Using global ocean‐atmosphere model experiments we show that the change in export production is a poor measure of the biological pump's feedback to the atmosphere. The change in global true oxygen utilization (TOU), an integrative measure of the imprint of the BCP on marine oxygen, however, is in good agreement with the net change in the biogenic air‐sea flux of oxygen. Since TOU correlates very well with apparent oxygen utilization (AOU) in our experiments, we propose to measure the change of AOU from data of global float programs to monitor the feedback of the BCP to the atmosphere. For the current ocean we estimate that BCP changes effect a CO2 uptake by the ocean in the range of 0.07 to 0.14 GtC/yr.

Document Type: Article
Keywords: biological carbon pump; export production; climate change; AOU
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2020GL089928
ISSN: 0094-8276
Projects: BIOACID, SFB754
Date Deposited: 20 Nov 2020 13:04
Last Modified: 20 Nov 2020 13:04
URI: http://oceanrep.geomar.de/id/eprint/51091

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