Sauerstoff ist mit 49,4 Gewichtsprozent das häufigste Element der Erdkruste und der Ozeane und mit 20,4 Gewichtsprozent in der Atmosphäre enthalten.
mol
H2O
CH4
CO2
NO2
SF6
ppm
~10000
1,8
395
0,32
--
stay
eternal
5a-10a
500a-1000a (flux) 2a (δ17O)
100a
3 Ka
climasens
3
20
1
300
23000
Januar 18, 2023
Scientists have long suspected that silicate weathering plays a major role in regulating the Earth’s carbon cycle. The mechanism of silicate weathering could provide a geologically constant force in keeping carbon dioxide — and global temperatures — in check. ‘Silikatverwitterung’.
Modification of δ17O: combustion and isotope exchange with water. They produce CO2 with δ17O = 0.21‰, & air O2 = 0.21‰ The oxygen of near-surface CO2 in this region is primarily affected by biogeochemistry with minor influences from the stratosphere and human activities. The atmospheric CO2δ17O values vary from 0.216 to 0.415‰ with an average of 0.335‰. Difference=+30%.