Temperature average global

Yamamoto R., Hoshiari M. and Iwashima T., Changes of surface air temperature averaged globally during the years 1937-1972. Archiv. Meteor. Geophys. Bioklim., B25, 05-115 (1977). 

A rise in average temperature of 1 °C may not seem enough to cause dramatic shifts in the weather, but the historical record shows otherwise. The period from 1500 to 1850 is called the Little Ice Age, because there were extensive increases in the sizes of the glaciers in all alpine regions. During that period, the average global temperature was just 0.5 °C lower than in 1900. 

During the past millennium the average global temperature was essentially flat until about 1900, then spiked upward, like the upturned blade of a hockey stick. Some view this as a clear indication that humans are warming the globe, but others hold that the climate is undergoing a natural fluctuation not unlike those in past eras. 

Paleocene eocene thermal maximum (PETM) A hyperthermal period, 55.8mybp, during which average global temperatures increased by 6°C for a period of 20,000 years. 

Note that the units of kH0. are (molecule cm"3) 1 s l and that tm,w has been calculated for an average global tropospheric HO concentration of 1 x 106 molecule cm-3 at 25°C. We should also note that, as a first approximation, we neglect the effect of temperature on k H0., because over the temperature range of the lower troposphere (-40° to 30°C), this effect is less than a factor of 2 to 3 for many compounds of interest to us (Atkinson 1989 and 1994). 

An average global temperature increase of only a few degrees would not be felt uniformly around the world. 

One thing that is certain is that if the levels of greenhouse gases in the atmosphere continue to rise, there will definitely be an increase in average global temperatures. 

The solution to Equation (4.32) enables us to trace temperature variations Tw(z, t) and suggests the conclusion that in this case these variations weakly depend on TW(Q, t). Even if 7V(0, /) increases by 2°C, then according to (4.32), the amplitude of temperature changes with depth will rapidly decrease to 0.97°C, 0.33°C, and 0.01°C at depths 40cm, 2m, and 3m, respectively. Hence, with a 2°C increase in the average global atmospheric temperature, flux FlCH4 will increase by no more than 1.4%. 

Coral reefs are likely to undergo annual bleaching and eventually experience severe damage if the average global temperature increases more than 1 degree Celsius. Coral reefs are home to some of the ocean s richest biodiversity. 

---