{"NOAAStudyId":"24330","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2018-05-30","dataPublisher":"NOAA","dataType":"CLIMATE FORCING","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/climate-forcing","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-forcing-24330.xml","doi":null,"earliestYearBP":16380000,"earliestYearCE":-16378050,"entryId":"noaa-forcing-24330","funding":[{"fundingAgency":"Natural Environment Research Council (NERC)","fundingGrant":"NE/D00876X/2, NE/I006176/1, NE/D008654/1"}],"investigators":"Foster, G.L.; Lear, C.H.; Rae, J.W.B.","mostRecentYearBP":12280000,"mostRecentYearCE":-12278050,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/24330","originalSource":null,"publication":[{"abstract":"The middle Miocene Climatic Optimum (17-15 Ma; MCO) is a period of global warmth and relatively high CO2 and is thought to be associated with a significant retreat of the Antarctic Ice Sheet (AIS). We present here a new planktic foraminiferal d11B record from 16.6 to 11.8 Ma from two deep ocean sites currently in equilibrium with the atmosphere with respect to CO2. These new data demonstrate that the evolution of global climate during the middle Miocene (as reflected by changes in the cyrosphere) was well correlated to variations in the concentration of atmospheric CO2. What is more, within our sampling resolution (~1 sample per 300 kyr) there is no evidence of hysteresis in the response of ice volume to CO2 forcing during the middle Miocene, contrary to what is understood about the Antarctic Ice Sheet from ice sheet modelling studies. In agreement with previous data, we show that absolute levels of CO2 during the MCO were relatively modest (350-400 ppm) and levels either side of the MCO are similar or lower than the pre-industrial (200-260 ppm). These new data imply the presence of either a very dynamic AIS at relatively low CO2 during the middle Miocene or the advance and retreat of significant northern hemisphere ice. Recent drilling on the Antarctic margin and shore based studies indicate significant retreat and advance beyond the modern limits of the AIS did occur during the middle Miocene, but the complete loss of the AIS was unlikely. Consequently, it seems that ice volume and climate variations during the middle Miocene probably involved a more dynamic AIS than the modern but also some component of land-based ice in the northern hemisphere.","author":{"name":"Gavin L. Foster, Caroline H. Lear, James W.B. Rae"},"citation":"Gavin L. Foster, Caroline H. Lear, James W.B. Rae. 2012. The evolution of pCO2, ice volume and climate during the middle Miocene. Earth and Planetary Science Letters, 341-344, 243-254. doi: 10.1016/j.epsl.2012.06.007","edition":null,"identifier":{"id":"10.1016/j.epsl.2012.06.007","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2012.06.007"},"issue":null,"journal":"Earth and Planetary Science Letters","pages":"243-254","pubRank":"1","pubYear":2012,"reportNumber":null,"title":"The evolution of pCO2, ice volume and climate during the middle Miocene","type":"publication","volume":"341-344"}],"reconstruction":"Y","scienceKeywords":null,"site":[{"NOAASiteId":"30613","geo":{"geoType":"Feature","geometry":{"coordinates":["3.72","-42.92"],"type":"POINT"},"properties":{"easternmostLongitude":"-42.92","maxElevationMeters":"-3598","minElevationMeters":"-3598","northernmostLatitude":"3.72","southernmostLatitude":"3.72","westernmostLongitude":"-42.92"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic 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