Title A century of climate variability in central Dronning Maud Land, East Antarctica, and its relation to Southern Annular Mode and El Niņo- Southern Oscillation
Author Naik, S.S.; Thamban, M.; Laluraj, C.M.; Redkar, B.L.; Chaturvedi, A.
Author Affil Naik, S.S., National Centre for Antarctic and Ocean Research, Vasco-da-Gama, India. Other: Geological Survey of India, India
Source Journal of Geophysical Research, 115(D16), Citation D16102. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0148- 0227
Publication Date 2010
Notes In English. 59 refs. Ant. Acc. No: 91596. GeoRef Acc. No: 310421
Index Terms atmospheric circulation; climate; climatic change; glacial geology; ice sheets; isotopes; oxygen; polynyas; temperature; Antarctica--Queen Maud Land; Antarctica; climate change; decadal variations; El Nino; El Nino Southern Oscillation; ice cores; isotope ratios; O-18/O-16; Queen Maud Land; seasonal variations; Southern Annular Mode; Southern Oscillation; stable isotopes
Abstract Stable isotope records of oxygen and hydrogen were studied from a 65 m long ice core retrieved from central Dronning Maud Land, East Antarctica, in order to reconstruct the coastal Antarctic climate variability during the last century and its relation to the Southern Annular Mode (SAM) and El Niņo-Southern Oscillation (ENSO). The delta 18O records showed a significant relation to the SAM with a dominant ~4 years variability, except during specific periods (1918-1927, 1938-1947, and 1989-2005) when ENSO teleconnection was established through the in-phase relation between SAM and Southern Oscillation Index (SOI). The combined influence of ENSO and SAM was seen on surface air temperatures in this region mainly during the austral summer season from 1989 to 2005. Further, a significant relationship between delta 18O and SAM was observed on a decadal scale, which overrides the intermittent influence of ENSO. Major shifts in the deuterium excess record were observed during periods of ENSO teleconnections, which support a shift in moisture source regions during the periods of stronger ENSO teleconnections. Surface air temperatures estimated using the delta 18O-T spatial slope for this region depicted a significant warming of 1°C for the past century. The study reveals that throughout the last century, SAM was the dominant mode of climatic variability in the coastal region of central Dronning Maud Land on a decadal scale.
URL http://hdl.handle.net/10.1029/2009JD013268
Publication Type journal article
Record ID 65007176