Had to break away for a bit...
The difficulty is that there are no historical measurments of phytoplankton cycles, if there are some.
That hasn't stopped scientists from referring to historical levels of C02, now has it? We REALLY HAVE NO IDEA just how high levels of C02 were just prior to the last ice age.
Really?
"Ice cores have been drilled in Antarctica and Greenland to examine the variation of the composition of air trapped in bubbles in the ice, representing global atmospheric conditions as much as 160,000 years BP (1). The first and deepest ice core was drilled at Vostok in central Antarctica, originally by a French-Russian team (Fig 1). Drilling of the core still continues, and it is expected that, when drilling is completed in a few years time, an age of up to 500,000 years will have been reached. Starting on the right-hand side of the graph at about 140,000 years ago, the climate was about 6?C colder than it is today. This was an ice age. Then at about 130,000 years ago, there was a quite rapid warming period until about 125,000 years ago, when the climate was, perhaps, 1?C or 2?C warmer than today. These short warmer periods are called interglacials."
www-das.uwyo.edu
See the chart in the link for atmospheric CO2 levels over the last 160,000 years. [Figure 1].
See figure 2 for atmospheric CO2 levles over the last 1000 years.
You get the honor of showing me what you have on global historical levels of phytoplankton.
jttmab |
