GEOG 205 Lecture Notes - Photic Zone, Global Temperature Record, Thermocline
Document Summary
Question about thermohaline circulation will be on the final! How do we know the earth"s temperature is increasing: surface thermometer record instrumental land temperature record. 12 of last 13 years (1995-2006) rank among warmest. Average surface temperature rose by 0. 74c from 1906 to 2004. Where the measurements were taken affects the data rural areas can now be urban: ocean temperatures. Water doesn"t heat or cool down as fast as land when there are increases in temperature, the ocean will not feel the same effect right away. Differences in ocean depths first 100 m euphotic zone often referred to as mixed or surface layer. 100 m 300 (to 500 m) thermocline, subject to fluctuations from tides, waves & winds. Beyond 500 m depths of the oceans, not influenced by surface phenomena: ocean conveyor belt waters in circulation at bottom for thousands of years.
