Antarctic climate variability during the past few centuries based on ice core records from coastal Dronning Maud Land and its implications on the recent warming

noaa-icecore-22451 Dronning Maud Land Coastal Ice Core 470 Year Oxygen Isotope Data Meloth, T.; Naik, S.S.; Laluraj, C.M.; Chaturvedi, A.; Ravindra, R. Dronning Maud Land Coastal Ice Core 470 Year Oxygen Isotope Data 2017-05-19 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22451 Investigator T. Meloth Investigator S.S. Naik Investigator C.M. Laluraj Investigator A. Chaturvedi Investigator R. Ravindra earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,composited,isotope ratio mass spectrometry,N,null earth science paleoclimate ice cores age,null,null,year Common Era,null,ice cores,null,null,N,null earth science paleoclimate ice core oxygen isotopes geoscientificInformation 1533 AD 1994 AD 417 cal yr BP -44 cal yr BP Complete -70.86 -70.86 11.54 11.54 500 500 Continent Antarctica IND-22/B4>LATITUDE -70.86>LONGITUDE 11.54 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Meloth Thamban, Sushant S. Naik, C.M. Laluraj, Arun Chaturvedi, Rasik Ravindra 2012 Antarctic climate variability during the past few centuries based on ice core records from coastal Dronning Maud Land and its implications on the recent warming Society of Earth Scientists Series 6 5 51-66 10.1007/978-3-642-28845-6_5 https://link.springer.com/chapter/10.1007%2F978-3-642-28845-6_5

The role of Antarctic climate variables within the global system and its spatial and temporal complexity are still poorly understood due to the limited and very short periods of observational data collected over a few decades. In order to reconstruct the coastal Antarctic variability during the past five centuries with annual to sub-annual resolution, two firn/ice cores (62 and 65 m) from the central Dronning Maud Land region were studied for proxy parameters like stable isotope and dust records. While the IND-25/B5 provided high-resolution records of the past 100 years (1905-2005), the IND-22/B4 core represented the past ~470 years (1530-2002) of climate change. The IND-25/B5 delta18O record revealed a significant relation to the Southern Annular Mode (SAM), except during certain intervals (1918-1927, 1938-1947 & 1989-2005), when linkage to the El Niño Southern Oscillation (ENSO) was established through the in-phase relation between SAM and ENSO. However, on a decadal scale, a significant relationship between delta18O and SAM is observed that overrides the intermittent the influence of ENSO. Significant shifts in the deuterium excess record were also observed during periods of ENSO interaction. This may imply a change in moisture source during the periods of stronger ENSO teleconnections. The extended records of IND-22/B4 exhibited relatively more negative delta18O values during periods of reduced solar activity like the Dalton and Maunder Minima, suggesting influence of solar activity on Antarctic climate. The estimated surface air temperatures using the delta18O profiles of two ice cores revealed a significant warming by 0.6-1C per century, with greatly enhanced warming during the past few decades (~0.4C per decade). STUDY NOTES: Oxygen isotope (d18O) data from two shallow ice/firn cores collected in coastal Dronning Maud Land, East Antarctica, for the past 470 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/maud/dronning2012d18o.txt Formatted Text Data File; Dronning Maud Land Coastal Ice Core d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11