论文部分内容阅读
Arctic ice ice coring outside the Greenland ice cap is challenging due to summer melting that make interpretation difficult-but rewarding with modern techniques.We propose ice coring on Agassiz ice cap, Canada where ice extending to the Glacial maximum can be found at 130 m depth, and no chemical analysis has yet been made.This would provide a valuable addition to Greenland ice cores, helping establish ice sheet deglaciation history and regional features like sea ice extent histories.Vestfonna, Svalbard is a more convenient 300 m deep ice cap, frozen to bed and likely to contain high resolution records of Euro-Arctic regional environment spanning 2-3000 years.The Arctic is one place where climate change is having immediate impacts on permafrost,sea ice and ice sheets.Therefore it is a target of climate amelioration using geoengineering techniques such as stratospheric aerosols or surface albedo modification.Indeed since permafrost stores huge amounts of carbon that would be released on melting, it may create a potential climate emergency in the next few decades.We show Earth System Model simulations from 12 groups in the Geomip consortium, that simulate the global effects of geoengineering by balancing greenhouse gas radiative forcing with reduction of incoming solar radiation.We also present other potential Arctic geoengineering ideas and discuss the severe governance,engineering and ethical problems of geoengineering the climate.