Impact of climate change on the global oceanic sink of CO 2 Corinne Le Quéré, University of East Anglia and British Antarctic Survey
Smith and Reynolds 2005 and IPCC 2007 water energy observed warming trend decadal changes in the earth’s physical system winds
geological reservoirs fossil fuel emissions land use change land sink ocean sink atmosphere CO 2 budget (GtC/y) Global Carbon Project, Canadell et al. 2007
decadal trend in the Airborne Fraction atm CO 2 CO 2 emissions (FF + Land Use) gain of (p = 0.89) time Airborne fraction Canadell et al. 2007, PNAS
geological reservoirs fossil fuel emissions land use change land sink ocean sink atmosphere CO 2 budget (GtC/y) Global Carbon Project, Canadell et al. 2007
physical transport CO 2 chemical reactions atmosphere ocean biological activity
Mauna Loa observatory (Hawaii) Alert (Canada) Palmer (Antarctica)
Alert (Canada) Palmer (Antarctica) atmospheric CO 2 time (y)
Alert (Canada) Palmer (Antarctica) atmospheric CO 2
Atmospheric Inverse Model: C measured ↔ C modeled = Af +c o model and approach: Christian Rödenbeck
CO 2 sink (PgC/y) expected trend Le Quéré, Rödenbeck, Buitenhuis et al change in Southern Ocean CO 2 sink
data from Takahashi et al., DSR (2008) Feely et al., 2006, Schuster and Watson, 2007, Takahashi et al., 2006 deseasonalised observations, evenly distributed over 3 decades longest data series from: Richard Feely, Cathy E. Cosca, Rik Wanninkhof, David W. Chipman, Colm Sweeney, Andrew Watson, Dorothee C. E. Bakker, Ute Schuster, H. Yoshikawa-Inoue, Masao Ishii and T. Modorikawa, Y. Nojiri, Jon Olafsson, C. S. Wong., Arne Kroetzinger, Bronte Tilbrook, Truls Johannessen and Are Olsen. trend in oceanic pCO (uatm/y)
data from Takahashi et al., DSR (2008) Feely et al., 2006, Schuster and Watson, 2007, Takahashi et al., 2006 deseasonalised observations, evenly distributed over 3 decades longest data series from: Richard Feely, Cathy E. Cosca, Rik Wanninkhof, David W. Chipman, Colm Sweeney, Andrew Watson, Dorothee C. E. Bakker, Ute Schuster, H. Yoshikawa-Inoue, Masao Ishii and T. Modorikawa, Y. Nojiri, Jon Olafsson, C. S. Wong., Arne Kroetzinger, Bronte Tilbrook, Truls Johannessen and Are Olsen. trend in oceanic pCO (uatm/y)
PISCES-T ecosystem model 2 phyto, 2 zoo., 2 sinking particles limitation by Fe, P, and Si initialise with observations in 1948 (Buitenhuis et al., GBC 2006) identifying the processes with the OPA model OPA General Circulation model o x2 o resolution 31 vertical levels calculated vertical mixing NCEP daily forcing
SSMI winds (Wentz et al 2007)updated from Reynolds and Smith (1994) Obs NCEP NCEP 2 Trends SST winds +1°C +0.4 m/s
Obs CO 2 only Trends in ocean pCO 2 (uatm/y) Le Quéré, Takahashi, Buitenhuis, Rödenbeck & Sutherland, in prep.
Obs NCEP NCEP 2 Trends in ocean pCO 2 (uatm/y) Le Quéré, Takahashi, Buitenhuis, Rödenbeck & Sutherland, in prep. CO 2 and climate
CO 2 sink (PgC/y) CO 2 only Time (y) change in Global Ocean CO 2 sink Le Quéré, Takahashi, Buitenhuis, Rödenbeck & Sutherland, in prep. CO 2 and climate
Atmospheric inversion Ocean model CO 2 and climateCO 2 only globe ± north0.04 ± tropics ± south ± Trend in ocean CO 2 sink (PgC/y per decade, ) difference of 0.20 PgC/y per decade Le Quéré, Takahashi, Buitenhuis, Rödenbeck & Sutherland, in prep.
PISCES-T ecosystem model 2 phyto, 2 zoo., 2 sinking particles limitation by Fe, P, and Si initialise with observations in 1948 (Buitenhuis et al., GBC 2006) identifying the processes with the OPA model OPA General Circulation model o x2 o resolution 31 vertical levels calculated vertical mixing NCEP daily forcing no T effect on CO 2 constant fluxes Le Quéré, Takahashi, Buitenhuis, Rödenbeck & Sutherland, in prep.
Climate only combinedtempwindfluxes globe north tropics south Trend in ocean CO 2 sink (PgC/y per decade, ) ~50% of recent trends in ocean CO 2 sink can be attributed to human activities Le Quéré, Takahashi, Buitenhuis, Rödenbeck & Sutherland, in prep.
the Airborne Fraction atm CO 2 CO 2 emissions (FF + Land Use) (p = 0.89) time Airborne fraction Canadell et al. 2007, PNAS trend in airborne fraction: 0.07 PgC/y per decade trend in ocean CO 2 sink from climate (since 1981): 0.20 PgC/y per decade
modelled change in carbon storage (μmol/L) depth (m)
modelled change in surface pH depth (m)
conditions deep ocean C deep = 2260 C surface = 2120 higher winds causes CO 2 outgassing human CO 2 emissions 65ºS 35ºS
conditions under very high atmospheric CO 2 deep ocean C deep = 2260 C surface > 2260 human CO 2 emissions higher winds causes CO 2 uptake 65ºS35ºS
>100 years after CO 2 emissions stop deep ocean C deep = C C surface = C higher winds causes CO 2 outgassing 65ºS35ºS
Raupach et al., 2007 fossil fuel CO 2 emissions for the world