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- Title
Observation‐Based Trends of the Southern Ocean Carbon Sink.
- Authors
Ritter, R.; Landschützer, P.; Gruber, N.; Fay, A. R.; Iida, Y.; Jones, S.; Nakaoka, S.; Park, G.‐H.; Peylin, P.; Rödenbeck, C.; Rodgers, K. B.; Shutler, J. D.; Zeng, J.
- Abstract
Abstract: The Southern Ocean (SO) carbon sink has strengthened substantially since the year 2000, following a decade of a weakening trend. However, the surface ocean <italic>p</italic>CO2 data underlying this trend reversal are sparse, requiring a substantial amount of extrapolation to map the data. Here we use nine different <italic>p</italic>CO2 mapping products to investigate the SO trends and their sensitivity to the mapping procedure. We find a robust temporal coherence for the entire SO, with eight of the nine products agreeing on the sign of the decadal trends, that is, a weakening CO2 sink trend in the 1990s (on average 0.22 ± 0.24 pg C yr−1 decade−1), and a strengthening sink trend during the 2000s (−0.35 ± 0.23 pg C yr−1 decade−1). Spatially, the multiproduct mean reveals rather uniform trends, but the confidence is limited, given the small number of statistically significant trends from the individual products, particularly during the data‐sparse 1990–1999 period.
- Publication
Geophysical Research Letters, 2017, Vol 44, Issue 24, p12,339
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1002/2017GL074837