GEOG 3110 Lecture Notes - Lecture 20: Stoma, Great Tit, Pinus Albicaulis
9 Apr 2018
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Dec 1, 2017-12-01 lag between co2 and temperature because oceans suck up heat heat catches up with. Co2 a(cid:374)d that"s (cid:271)ad wihi(cid:272)h releases (cid:373)ore co2 temp gets warmer lose water. Trends seen now may not be indicative of long term trends . Insects and wildfire prone to these exposures: short term we know exactly results from this, the life (cid:272)(cid:455)(cid:272)le that"s (cid:373)ore affe(cid:272)ted (cid:271)(cid:455) the e(cid:454)posures, the baby seedlings. Rising water use efficiency when co2 go up. Co2 enrichment so far: fossil record based on very long term experiments, all other based on, short term experiments, step shift in co2. Get every tree ring and remove effects of global warming, drying and wet. Results: 3201 tree ring sites 20% of trees are increasing growth rates as a response to rising co2, 80% of trees are not being affected (more than?) a hint of differences between species. Evidence for very limited co2 fertilization (~20% of sites.
