Project Information
Collaborative Research: Surface pCO2 and the effects of Winter Time Overturning in the Drake Passage
Start Date:
End Date:
The proposed project will expand the suite of observations and lengthen the existing time series of underway surface dissolved carbon dioxide (pCO2) measurements transects across the Drake Passage on the R/VIB L.M. Gould. The additional observations include oxygen, nutrients and total CO2 (TCO2) concentrations, and the 13C to 12C ratio of TCO2. The continued and expanded time series will contribute towards two main scientific goals: the quantification of the spatial and temporal variability and the trends of surface carbon dioxide species in four major water mass regimes in the Drake Passage, and the understanding of the dominant processes and changes in those processes that contribute to the variability in surface pCO2 and the resulting air-sea flux of CO2 in the Drake Passage. The expanded program will also include the analysis of the 14C/12C of TCO2 and the specific study of the observations on one short wintertime cruise, with the objective of testing the hypothesis that the dissolved carbon dioxide in surface waters of the Drake Passage is determined by the degree of winter mixing. This is of special significance in light of two scenarios that may be affecting the ventilation of Southern Ocean deep water now and in the future: a decrease in water column stratification with the observations of higher zonal winds, or an increase in stratification due to higher precipitation and warming from climate change. If winter mixing determines the mean annual pCO2 in the Drake Passage, the increasing trend in atmospheric pCO2 should have little effect on sea surface pCO2.
Person Role
Sweeney, Colm Investigator
Sweeney, Colm Investigator
Antarctic Ocean and Atmospheric Sciences Award # 0636975
Deployment Type
LMG0909 ship expedition
Data Management Plan
None in the Database
Product Level:
Not provided
Repository Title (link) Format(s) Status
R2R Expedition data of LMG0909 None exists
  1. Quay, P., Sonnerup, R., Munro, D., & Sweeney, C. (2017). Anthropogenic CO2accumulation and uptake rates in the Pacific Ocean based on changes in the13C/12C of dissolved inorganic carbon. Global Biogeochemical Cycles, 31(1), 59–80. (doi:10.1002/2016gb005460)
  2. Landschützer, P., Gruber, N., Haumann, F. A., Rödenbeck, C., Bakker, D. C. E., van Heuven, S., … Wanninkhof, R. (2015). The reinvigoration of the Southern Ocean carbon sink. Science, 349(6253), 1221–1224. (doi:10.1126/science.aab2620)
Platforms and Instruments

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