A19ge Carbon cycle

3 main GHG

H2, CH4, CO2

carbon reservoir content (pg)

Surface ocean - 700

atmosphere - 750

plants and soils - 2000

deep ocean - 37300

earths crust - 100,000,000

describe oceon/atmosphere gas exchange

CO2 dissolves in upper layer ocean

under natural conditions, the same amount would be vented back out

describe the carbon cycle processes

photosynthesis - CO2 + H20 + Nutrients + energy → organic matter + O2

respiration and decomp - reverse of photosynthesis

combustion - burnign of organic materials to release CO2

volcanic erruptions

weathering - carbonate and silicate weathering, decarbonation reactions release CO2 back into atmosphere

describe CO2 interactions during glacials

increased CO2 solubility in ocean reservoirs

increased photosynthesis storage in biomass = increased rock and sediment storage

reduced calcification

Ocean inorganic carbon (coral)

sources of inorganic CO2 - calcification of reef building, coccolithophores and foraminifera

when shelves exposed during glacial periods, less calcification

Terrestrial carbon (vegetation)

NPP significantly lower during glacials

carbon storage in peat frozen in tundra

causes and reservoirs for lower glacial atmospheric CO2

cooler SW temps = increased CO2 solubility

ocean inorganic carbon

ocean biological carbon