Observed amplification of the seasonal CO2 cycle at the Southern Ocean Time Series

Frontiers in Marine Science

Marine Science

Eric Schulz¹  Peter Jansen²  Richard J. Matear²  Elizabeth H. Shadwick³  Cathryn A. Wynn-Edwards³  Adrienne J. Sutton⁴ 

[1] Bureau of Meteorology, Melbourne, VIC, Australia;Commonwealth Scientific and Industrial Research Organisation (CSIRO), Environment, Hobart, TAS, Australia;Commonwealth Scientific and Industrial Research Organisation (CSIRO), Environment, Hobart, TAS, Australia;Australian Antarctic Program Partnership (AAPP), University of Tasmania, Hobart, TAS, Australia;Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration (NOAA), Seattle, WA, United States;

关键词: CO partial pressure (pCO);    Southern Ocean Time Series (SOTS);    pCO seasonality;    air-sea CO flux;    ocean acidification;   

DOI  :  10.3389/fmars.2023.1281854

 received in 2023-08-23, accepted in 2023-09-25,  发布年份 2023

来源: Frontiers

【 摘 要 】

The Subantarctic Zone, the circumpolar region of the Southern Ocean between the Subtropical and Subantarctic fronts, plays an important role in air-sea CO2 exchange, the storage of anthropogenic CO2, and the ventilation of the lower thermocline. Here we use a time series from moored platforms deployed between 2011 and 2021 as part of the Southern Ocean Time Series (SOTS) observatory to investigate the seasonality and interannual variability of upper ocean hydrography and seawater CO2 partial pressure (pCO2). The region is a net sink for atmospheric CO2 over the nearly 10-year record, with trends revealing that the ocean pCO2 may be increasing slightly faster than the atmosphere, suggesting that oceanic as well as anthropogenic atmospheric forcing contributes to the decadal change, which includes a decline in pH on the order of 0.003 yr−1. The observations also show an amplification of the seasonal cycle in pCO2, potentially linked to changes in mixed layer depth and biological productivity.

【 授权许可】

Unknown   
Copyright © 2023 Shadwick, Wynn-Edwards, Matear, Jansen, Schulz and Sutton