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Sub-seasonal variability in air-sea exchange of CO2. PowerPoint Presentation
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Sub-seasonal variability in air-sea exchange of CO2.

Sub-seasonal variability in air-sea exchange of CO2.

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Sub-seasonal variability in air-sea exchange of CO2.

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  1. Sub-seasonal variability in air-sea exchange of CO2. • We know ocean CO2 uptake is seasonal due to • Temperature related change in solubility. • Light mediate biological growth. • Stratification changes that affect stability of water column. • Q: How much sub-seasonal variability is there and what causes it? • Physical effects of wind. Efficiency of uptake proportional to (wind speed)3 e.g. • Upper panel  strong winter storm 2000-20,000 T CO2/hour increase in Atlantic. • v • Lower panel  calm weather 2000-20,000 T CO2/hour decrease David Wang, MIT (+Chris Hill, StephDutkiewicz, Mick Follows, DimitrisMenemenlis, Holger Brix)

  2. Sub-seasonal variability in air-sea exchange of CO2. At individual points “synoptic variability” is large compared to seasonal cycle. May also be true in integrals. Implications for uptake and burial depend on correlations with physical subductionand/or biological growth. 100 100 100 • Ocean uptake variability detectable on synoptic meteorology time-scales? • Ocean swallows carbon in sizable gulps, not a slowly varying, seasonal drip feed? David Wang, MIT (+Chris Hill, StephDutkiewicz, Mick Follows, DimitrisMenemenlis, Holger Brix)