ENV100H1 Lecture Notes - Lecture 8: Calcite, Upwelling, Walker Circulation

• School: UTSG
• Department: School of Environment
• Course: ENV100H1
• Professor: Helene Cyr

Document Summary

Ocean sediment core from indian ocean- mass accumulation rate increased in the last. 40mil years formation of himalayas increase erosion decrease co2. Thermohaline circulation conveyor belt of deep water circulation. 4c highest density cooling- heavier evaporation > salination cold + salty= dense transport warm water towards higher latitudes towards the north deep water formation thermohaline circulation could stop- alter climate. 18,000 years ago- last ice age in toronto melt glacier- fresh water into ocean form light water prevent sinking. 13,000 years ago-younger-dramas (multi-proxy paleoenvironmental evidence) major declines in tree pollen increase pollen from tundra plants increase in polar foraminifera in marine sediments. Aerosols- small airborne particles (many sulfur components- volcanoes, land and ocean organisms) acidity in ice core (indication of volcanic eruptions) Claw hypothesis earth has mechanisms to regulate temp by itself warmer seawater- more organisms- dms (sulphate components from microbial activities)- more clouds- more albedo- cooling (counter warming of seawater)