MSC 111 Lecture Notes - Lecture 21: Milankovitch Cycles, Glacial Period, Ice Core

• School: University of Miami
• Department: Marine Science
• Course: MSC 111
• Professor: Peterson Larry

Document Summary

Water with light 16-o evaporates more readily- locked up in ice sheets. More 18-o remains in ocean when temperatures drop an ce sheets increase. Oceans 18-)/16-o ratio recorded in skeletal carbonates and provides index of global ice volume: interglacial period, glacial period. Des(cid:272)(cid:396)i(cid:271)es (cid:272)ha(cid:374)ges i(cid:374) sola(cid:396) i(cid:374)solatio(cid:374) due to (cid:448)a(cid:396)iatio(cid:374)s i(cid:374) ea(cid:396)th"s o(cid:396)(cid:271)it. Developed further formulas alling info to calculate insolation budget for any latitude. Milankovitch periodicities dominate the climate record of global ice volume. Via time-series analysis of deep sea oxygen isotope records. E(cid:454)plai(cid:374) g(cid:396)o(cid:449)th a(cid:374)d (cid:396)et(cid:396)eat of i(cid:272)e ages (cid:862)pa(cid:272)e(cid:373)ake(cid:396)s(cid:863) Uncertain how weak insolation signals result in dramatic climatic changes. Must be additional factors/feedbacks that synchronize responses between. I(cid:374)solatio(cid:374) (cid:448)a(cid:396)iatio(cid:374)s a(cid:396)e out of phase (cid:271)et(cid:449)ee(cid:374) he(cid:373)isphe(cid:396)es due to ea(cid:396)th"s tilt hemispheres. Provide up to 800,000 years of informative. Gas composition of atmosphere is preserved in bubbles (co2 and methane concentrations) Ipcc ar4 executive summary: very likely that interglacial-glacial co1 variations have strongly amplified climate variations.