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From top to bottom: * Levels of carbon dioxide (CO2). High rates of snow accumulation provide excellent time resolution, and bubbles in the ice core preserve actual samples of the world’s ancient atmosphere. By looking at past concentrations of greenhouse gasses in layers in ice cores, scientists can calculate how modern amounts of carbon dioxide and methane compare to those of the past, and, essentially, compare past concentrations of greenhouse gasses to temperature. Ice cores have been drilled in ice sheets worldwide, but notably in Greenland and Antarctica[4, 5]. Last year researchers said they had identified regions in Antarctica they believe could have the oldest ice, including some that could be 1.5 million years old.“The mid-Pleistocene transition is a most important and enigmatic time interval in the more recent climate history of our planet,” Hubertus Fischer, an experimental climate physics professor at the University of Bern in Switzerland and a lead author of the study, said in a press release in November 2013.
But scientists want to go even farther back in time, to what is known as the mid-Pleistocene transition, which took place 900,000 to 1.2 million years ago. You can’t just ask what your potential date does for a living, either: it’s already on their profile.420,000 years of ice core data from Vostok, Antarctica research station. From bottom to top: * Solar variation at 65°N due to en: Milankovitch cycles (connected to 18O). They spent two nights at each site, first collecting radar data and secondly collecting a 15 m shallow ice core. This schematic cross section of an ice sheet shows an ideal drilling site at the centre of the polar plateau near the ice divide, with ice flowing away from the ice divide in all direction. The large Greenland and Antarctic ice sheets have huge, high plateaux where snow accumulates in an ordered fashion. I try to give a short compliment, comment about something in their profile, and close with an open ended question in hopes for a response, but so far I have not had good results. The Hymen and Your First Time: You Do Not Have to Feel Pain or Bleed!