SCI1300 Lecture Notes - Lecture 11: Daisyworld, Glacier Mass Balance, Arctic Ocean

• School: Monash University
• Department: Science
• Course: SCI1300
• Professor: Christian Jakob

Document Summary

Salt rejection in sea-ice formation drives ocean circulations: water storage and fresh water source. Some characteristics: c(cid:396)(cid:455)osphe(cid:396)e o(cid:374) la(cid:374)d sto(cid:396)es 75% of the (cid:449)o(cid:396)ld"s f(cid:396)esh(cid:449)ate(cid:396, permanently ice covers 10% of the land surface (mostly antarctica and greenland) Ice covers about 7% of the oceans on average. In mid-winter, snow covers 49% of the land surface of the northern hemisphere. Forms when ocean water freezes: note that due to the salinity, the freezing temperature of ocean water is around -1. 8oc, the ice lattice structure cannot accommodate the salt particles and they are rejected into the. Sea ice forms an insulating layer at the top of the ocean. (cid:449)ate(cid:396), lo(cid:272)all(cid:455) i(cid:374)(cid:272)(cid:396)easi(cid:374)g the o(cid:272)ea(cid:374)"s sali(cid:374)it(cid:455) (cid:894)a(cid:374)d he(cid:374)(cid:272)e de(cid:374)sit(cid:455)(cid:895). > initiates deep ocean currents: as it oats o(cid:374) the (cid:449)ate(cid:396), sea i(cid:272)e is st(cid:396)o(cid:374)gl(cid:455) affe(cid:272)ted (cid:271)(cid:455) o(cid:272)ea(cid:374) su(cid:396)fa(cid:272)e (cid:272)u(cid:396)(cid:396)e(cid:374)ts. Ice thickness increases with the age of the ice.