A century of climate variability in central Dronning Maud Land, East Antarctica, and its relation to Southern Annular Mode and El Niño-Southern Oscillation

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 Niño‐S...

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Bibliographic Details
Published in:Journal of Geophysical Research: Atmospheres 2010-08, Vol.115 (D16), p.n/a
Main Authors: Naik, Sushant S., Thamban, Meloth, Laluraj, C. M., Redkar, B. L., Chaturvedi, Arun
Format: Article
Language:English
Subjects:
Air temperature
Antarctica
Atmospheric sciences
Climate change
Climate variability
Coastal zone
Cryosphere
Deuterium
Earth
Earth sciences
Earth, ocean, space
El Nino
Exact sciences and technology
Geophysics
ice core
Meteorology
SAM
Southern Oscillation
Stable isotopes
Surface temperature
Teleconnections
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Summary: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 Niño‐Southern Oscillation (ENSO). The δ18O 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 δ18O 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 δ18O‐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.
ISSN:0148-0227
2169-897X
2156-2202
2169-8996
DOI:10.1029/2009JD013268