In:
Nature Communications, Springer Science and Business Media LLC, Vol. 14, No. 1 ( 2023-05-04)
Kurzfassung:
Eastern Boundary Upwelling Systems (EBUS) are highly productive ecosystems. However, being poorly sampled and represented in global models, their role as atmospheric CO 2 sources and sinks remains elusive. In this work, we present a compilation of shipboard measurements over the past two decades from the Benguela Upwelling System (BUS) in the southeast Atlantic Ocean. Here, the warming effect of upwelled waters increases CO 2 partial pressure (pCO 2 ) and outgassing in the entire system, but is exceeded in the south through biologically-mediated CO 2 uptake through biologically unused, so-called preformed nutrients supplied from the Southern Ocean. Vice versa, inefficient nutrient utilization leads to preformed nutrient formation, increasing pCO 2 and counteracting human-induced CO 2 invasion in the Southern Ocean. However, preformed nutrient utilization in the BUS compensates with ~22–75 Tg C year −1 for 20–68% of estimated natural CO 2 outgassing in the Southern Ocean’s Atlantic sector (~ 110 Tg C year −1 ), implying the need to better resolve global change impacts on the BUS to understand the ocean’s role as future sink for anthropogenic CO 2 .
Materialart:
Online-Ressource
ISSN:
2041-1723
DOI:
10.1038/s41467-023-38208-y
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2023
ZDB Id:
2553671-0
