_:genid1 . _:genid1 "NSIDC-0440" . _:genid2 . _:genid2 . _:genid2 "-81.65"^^ . _:genid2 "-81.65"^^ . _:genid2 "-148.81"^^ . _:genid2 "-148.81"^^ . _:genid3 . _:genid3 . _:genid3 "2007-01-01T00:00:00"^^ . _:genid3 "2009-12-31T00:00:00"^^ . "nsidc-0440" . "Methane Measurements from the GISP2 and Siple Dome Ice Cores"^^ . "10.7265/N58P5XFZ" . _:genid1 . . "This data set contains methane measurements made in trapped air in the Holocene sections of two ice cores: the Siple Dome ice core in Antarctica, and the Greenland Ice Sheet Project 2 (GISP2) ice core in Greenland. The measurements were made at Oregon State University between 2007 and 2009. Measurements were made relative to the NOAA04 methane concentration scale using a working standard internally calibrated to NOAA certified air standards. Concentrations are corrected for gravitational fractionation and solubility effects in the melt-refreeze extraction. Data are available via FTP in Microsoft Excel (.xls) format."^^ . "2009-12-09T00:00:00"^^ . _:genid2 . _:genid3 . . _:genid4 . _:genid4 . _:genid4 . _:genid4 . "oai:nsidc/NSIDC-0440" . "http://nsidc.org/api/dataset/2/oai?verb=GetRecord&metadataPrefix=dif&identifier=oai:nsidc/NSIDC-0440" . .