A19GE Marine carbon cycling and ocean circulation

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Last updated 4:51 PM on 4/17/26
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6 Terms

1
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how does climate isolate CO2 from atmosphere into ocean

Increased export and production

2
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explain thermohaline circulation

1000 years to make a loop

reduction in deep atlantic circulation during glacial due to cold water

3
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thermohaline circulation proxies

nutrients - isotope 13C DIC distribution atlantic inverse to nutrients

water mass tracers

open circulation proxies

4
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depleted organic material of isotope 13C

during phtosynthesis plants take up lighter 12C isotope leaving organic material depleted in heavier 13C isotope

5
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what proxies show reduction in atlantic ocean ventilation

past SW 13C DIC inferred form of benthic foraminifera

SW 13C DIC has 1:1 ratio with benthic foraminiferal shell 13C

neodymium isotopes (nd) - less in atlantic deep water and more in antarctic bottom water

6
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condition for better preserved organic material

less dissolved O2 in SW