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A global database of Holocene paleotemperature records

first_imgA comprehensive database of paleoclimate records is needed to place recent warming into the longer-term context of natural climate variability. We present a global compilation of quality-controlled, published, temperature-sensitive proxy records extending back 12,000 years through the Holocene. Data were compiled from 679 sites where time series cover at least 4000 years, are resolved at sub-millennial scale (median spacing of 400 years or finer) and have at least one age control point every 3000 years, with cut-off values slackened in data-sparse regions. The data derive from lake sediment (51%), marine sediment (31%), peat (11%), glacier ice (3%), and other natural archives. The database contains 1319 records, including 157 from the Southern Hemisphere. The multi-proxy database comprises paleotemperature time series based on ecological assemblages, as well as biophysical and geochemical indicators that reflect mean annual or seasonal temperatures, as encoded in the database. This database can be used to reconstruct the spatiotemporal evolution of Holocene temperature at global to regional scales, and is publicly available in Linked Paleo Data (LiPD) format.last_img read more

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Rita Jeptoo: Kenyan marathon runner banned for doping

first_imgKenya’s Rita Jeptoo, winner of the Boston and Chicago marathons, has been banned for two years after failing a drugs test.She became Kenya’s first high-profile athlete to fail a test, when she tested positive for performance-enhancing drugs in September.Jeptoo, 33, says she may have been prescribed some banned substances at a local hospital after a road accident.She has become the 45th Kenyan athlete to have failed a doping test.David Rudisha, the Olympic 800 metres champion, said he fears for Kenya’s hard-won reputation after repeat allegations of doping.”Athletics Kenya followed due process in her matter and it was appropriate that she serves a two-year ban,” said the governing body’s chief executive Isaac Kamande. The ban comes only a few days after Athletics Kenya announced that eight more Kenyan athletes have been suspended for between one to four years for taking performance-enhancing drugs.Over the last two years Kenya has been in the spotlight after a German television programme claimed that many Kenyan athletes are doping.Jeptoo, one of most successful runners in Kenyan history, was due to be crowned world Marathon Major Champion for the year 2014 but the ceremony was called off soon after news of her failed test.She has won the previous three Boston and two Chicago marathons and also previously won the Stockholm, Paris, Milan and Lisbon marathons.last_img read more