Carbon as Velcro: Connecting physical climate variability and biogeochemical dynamics in the Southern Ocean Nikki Lovenduski Department of Atmospheric.

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Presentation transcript:

Carbon as Velcro: Connecting physical climate variability and biogeochemical dynamics in the Southern Ocean Nikki Lovenduski Department of Atmospheric and Oceanic Sciences Institute of Arctic and Alpine Research University of Colorado at Boulder

Part 1: The Mean State

Observed sea-air CO 2 flux Takahashi et al. (2009) into oceanout of ocean (mol m -2 yr -1 )

Ocean circulation and CO 2 Modified from Speer et al. (2000)

Integrated (<44 o S) sea-air CO 2 flux data from Gruber et al. (2009) into ocean

Why the model spread? Orr et al. (2002) cumulative anthropogenic CO 2 uptake Latitude Getting the physics “right”

Small-scale variability Ito et al. (2010) uptake storage Anthropogenic CO 2 (mol m -2 yr -1 ) (mol m -2 )

Ecologists aren’t off the hook! data from T. Ito (unpublished) into ocean OCMIP Dutkiewicz Integrated (<44 o S) sea-air CO 2 flux

Modeling the ecosystem data provided by M. Vogt The MAREMIP project: Phase I results CCSM-BECSeaWiFSNEMUROPISCESGreen surface chlorophyll concentration [ln(mg m -3 )]

Part 2: Variability

Historical evolution of CO 2 exchange

Variability and trends in CO 2 Lovenduski et al. (2008)

Modes of climate variability Southern Annular Mode (SAM) El Niño – Southern Oscillation (ENSO)

SAM drives CO 2 flux variability Lovenduski et al. (2007) SAM index CO 2 flux (Pg C yr -1 ) spatially-integrated (<35 o S), de-trended CO 2 fluxes de-trended SAM index

SAM drives CO 2 flux trend Lovenduski et al. (2008) pre-industrial CO 2 flux trend trend congruent with SAM (mol m -2 yr -2 )

Causes of variability Lovenduski et al. (2008) zonal-mean dissolved inorganic carbon (  mol kg -1 ) increased meridional overturning stronger wind stress

The great eddy debate a few references... Hallberg and Gnadadesikan (2006) Boning et al. (2008) Hogg et al. (2008) Screen et al. (2009) Farneti et al. (2010) Spence et al. (2010) Farneti and Gent (2011) Gent and Danabasoglu (in press) Can coarse-resolution ocean models simulate an appropriate response to increasing Southern Hemisphere winds?

SAM drives ecosystem variability Sallée et al. (2010) Mixed Layer Depth anomaly (+ SAM) surface chlorophyll anomaly vs. mixed layer depth anomaly

Part 3: Future Changes

Stratification Marinov et al. (2010)

Wind-driven circulation Sigmond et al. (2011)  Meridional Overturning GHG simulation  Meridional Overturning Ozone Recovery simulation SAM index GHGOzone Recovery Depth (m)

Acidification Orr et al. (2005) supersaturation undersaturation surface  CO 3 2- in 2100  CO 3 2- = [CO 3 2- ] - [CO 3 2- ] sat

The issues that plague us... 1.How large is the Southern Ocean CO 2 sink? 2.Can we accurately model CO 2 uptake? a)Accurately representing physics b)Accurately representing ecology 3.What is the role of eddies in CO 2 uptake and transport? The Mean State

The issues that plague us... 1.How do eddies respond to increasing wind stress? 2.Can we observe variability and trends? 1.physical circulation 2.CO 2 fluxes, storage 3.ecology Variability

The issues that plague us... 1.Stratification of the Southern Ocean 1.Impacts on carbon storage 2.Impacts on ecology 2.Wind-driven circulation changes 1.Will the wind stress continue to increase? 2.How will this impact carbon and ecology? 3.How quickly will Southern Ocean acidification proceed? Future Changes

The End!