Presenter: WEI-JUN CAI (University of Delaware)
Description:
Since the industrial revolution, the ocean has taken up 25-30% of the anthropogenic carbon emitted into the atmosphere. The South Atlantic Ocean is one of the most important anthropogenic CO2 (Canth) uptake areas in the world ocean, yet is less studied especially in its eastern basin. Here, after an extensive sensitivity test and method comparison, we applied a specific extended multiple linear regression (eMLR) method to estimate anthropogenic carbon changes (ΔCanth) between mid to late 1980s and early 2010s in the South Atlantic Ocean based on two meridional transects on the east (A13.5) and west (A16S) of the Mid-Atlantic Ridge (MAR), and one zonal transect (A10) across both A13.5 and A16S along 30°S. Over a period of about 25 years, the basin-wide Canth storage rate in the South Atlantic Ocean is 3.86 ± 0.14 Pg C decade-1. The two basins flanking the MAR have different meridional patterns of ΔCanth, yielding an average depth‐integrated ΔCanth for the top 2000 m of 0.91±0.25 mol m-2 yr-1 along A16S and 0.57±0.22 mol m-2 yr-1 along A13.5. The east-west basin ΔCanth contrasts are most prominent in the tropical region (0-20°S) within the Surface Water (SW), approximately from equator to 35°S in the Subantarctic Mode Water (SAMW), and all latitudes in the Antarctic Intermediate Water (AAIW). The spatial DCanth differences between the western and eastern basins are likely caused by transport driven by SAMW and AAIW formation and subduction and air-sea exchange at recent outcrops. In addition to the spatial heterogeneity, ΔCanth increases accelerated from the previous decade to the later decade, in line with the increase in air-sea CO2 exchange.
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Full list of Authors
- Hui Gao (University of Delaware & Nanjing University of Information Science and Technology)
- Rik Wanninkhof (NOAA Atlantic Oceanographic and Meteorological Laboratory)
- , Meibing Jin (International Arctic Research Center)
- Changming Dong (Nanjing University of information Science and Technology)
- Amanda Timmerman (University of Delaware)
- WEI-JUN CAI (University of Delaware)
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Anthropogenic CO2 changes (1980s to 2010) in the South Atlantic Ocean
Category
Scientific Session > OC - Climate and Ocean Change > OC21 GO-SHIP: Integrating physical, chemical, and biological oceanography using Global Repeat Hydrographic Surveys
Description
Presentation Preference: Oral
Supporting Program: None
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