SCI1300 Lecture Notes - Lecture 15: Ocean Heat Content, Ipcc Fifth Assessment Report, Sulfur Dioxide
4 Sep 2018
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A discussion of recent changes in global and australian climate! Observed northern hemisphere spring snow cover, arctic summer sea ice extent, Change in global average upper ocean heat content, global average sea level change: all time-series (coloured lines i(cid:374)di(cid:272)ati(cid:374)g di ere(cid:374)t data sets) show annual values, and where assessed, uncertainties are indicated by coloured shading. Sunspots: more sunspots mean increased solar radiation. So decline in sunspots in recent decades means that the sun cannot be blamed for the recent (cid:449)ar(cid:373)i(cid:374)g (cid:894)(cid:271)ut (cid:272)ould ha(cid:448)e (cid:272)o(cid:374)tri(cid:271)uted to (cid:449)ar(cid:373)i(cid:374)g i(cid:374) rst half of the 20th (cid:272)e(cid:374)tury(cid:895) What about volcanoes: active volcanoes add small amounts of co2 to the atmosphere as well as ash and sulfur dioxide. Global emissions of co2 from volcanic eruptions since 1750 have been at least 100 times smaller than human-caused emissions so cannot explain the observed warming since then.
