L12_Limiting_Nutrients_Ocean_Acidification_Fate_of_Fossil_Fuel_Carbon

L12_Limiting_Nutrients_Ocean_Acidification_Fate_of_Fossil_Fuel_Carbon

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Lecture’12:’Where’are’the’fossil’fuel’carbon’emissions’going?’ Reading:’Chapter’8’ Key’concepts’/’facts’/’vocab’etc.:’ Only’about’half’of’the’C’we’put’into’the’atmosphere’stays’in’the’atmosphere’ Growth’of’biomass’in’temperate’and’high’laEtudes’accounts’for’about’half’of’this’ sink’(Q:’why’not’tropical’ecosystems?)’ SequestraEon’in’the’oceans’accounts’for’the’other’half’ Influence’of’limiEng’nutrients’ Can’we’ bioecogeo-engineer’a’way’to’remove’CO 2 ’from’the’atmosphere?’
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atmosphere’ (800’ Gt)’ lithosphere’ (78,000,000’ Gt)’ hydrosphere’ (38,400’ Gt)’ land’ bioshpere’ (2200’ Gt)’ 1a:’ 63’ Gt/y’ 1b:’ 45’ Gt/y 2b:’ 45.2’ Gt /y’ 6:’ 0.4’Gt/y’ 7:’ 0.12’Gt/y’ 8:’ 8Gt/y A’“simple”’view’of’the’carbon’cycle’ Note:’the’fossil’fuel’flux’is’~8’ Gt/yr,’NOT’~0.12’ Gt/yr’as’indicated’in’ previous’versions’of’this’Fgure’
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1a:’Photosynthesis’(land):’ CO 2 ’+’H 2 O’ à ’CH 2 O’+’O 2’ 1b:’Photosynthesis’(marine):’ CO 2 ’+’H 2 O’ à ’CH 2 O’+’O 2 2a:’ ResipiraEon’(marine):’ CH 2 O’+’O 2 à ’CO 2 ’+’H 2 O’ 2b:’RespiraEon’(marine):’ CH 2 O’+’O 2 à ’CO 2 ’+’H 2 O’ 3:’Chemical’Weathering’(step’1)’:’ CaCO 3 ’+’CO 2 à ’Ca 2+ ’+’2HCO 3 -’ ’’’’’’’ CaSiO 3 ’+’CO 2 ’+’H 2 O’ à ’Ca 2+ ’+’2HCO 3 -’ +’SiO 2’ (Urey’ReacEon)’ 4a,’4b:’Geological’Burial’of’Organic’C’(to’produce’coal,’oil,’gas,’&’sedimentary’ ’ organic’C)’ 5:’Chemical’Weathering’(step’2,’creaEon’of’carbonate’rock):’ Ca 2+ ’+’2HCO 3 -’ à ’CaCO 3 ’+’2H +’ +’CO 3 2-’ ’’’ (Overall’SimpliFed’Urey’ReacEon:’ CaSiO 3 ’+’CO 2 à ’CaCO 3 ’+’SiO 2 )’ 6:’UpliD’and’oxidaEon’of’Geological’Organic’C:’ CH 2 O’+’O 2 à ’CO 2 ’+’H 2 O’ 7:’Metamorphism’and’volcanism:’ CaCO 3 ’+’SiO 2 à ’CO 2 ’+’CaSiO 3’ ’’’’’’ (“Reverse”’Urey’ReacEon)’ 8:’±ossil’±uel’Burning:’ CH 2 O’+’O 2 à ’CO 2 ’+’H 2 O’ 9:’Land’Use’Change:’ CH 2 O’+’O 2 à ’CO 2 ’+’H 2 O’ Note that there are only two general reac2ons here: Photosynthesis / respira2on Urey / reverse Urey reac2on
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If’we±re’adding’8’ Gt/yr’of’C’to’the’atmosphere,’and’the’atmosphere’reservoir’ size’is’800’ Gt,’what’is’the’per’year’increase’in’pCO 2’ (in’ppm)?’
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If’we±re’adding’8’ Gt/yr’of’C’to’the’atmosphere,’and’the’atmosphere’reservoir’ size’is’800’ Gt,’what’is’the’per’year’increase’in’pCO 2’ (in’ppm)?’
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L12_Limiting_Nutrients_Ocean_Acidification_Fate_of_Fossil_Fuel_Carbon

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