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

Naik, Sushant S.; Thamban, Meloth; Laluraj, C. M.; Redkar, B.L.; Chaturvedi, Arun

doi:10.1029/2009jd013268

Cited by 33 publications

(47 citation statements)

References 73 publications

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“…Based on the available instrumental data, it was demonstrated that while the western and northern parts of the Antarctic Peninsula is significantly warming, the East Antarctica in general and the South Pole in particular has shown a small cooling (Turner et al, 2005(Turner et al, & 2006. Analysis of instrumental records from the coastal East Antarctic 'Novo' station also indicate a warming for the last ~50 years with similar temperature trend as found in the IND-25/B5 ice core (Naik et al, 2010 b). Further support for such a warming derive from another coastal ice core from DML, which estimates a positive trend of the order of 0.12‰/decade for a similar time period (Divine et al, 2009).…”

Section: Palaeo-environmental Variability During the Past Five Centuriesmentioning

confidence: 82%

“…The ice core proxy based studies at revealed significant changes in Antarctic cryosphere and Southern Hemispheric climate during the past several hundreds of years (Laluraj et al, 2009(Laluraj et al, , 2011(Laluraj et al, & 2014Naik et al, 2010 a & b;Thamban et al, 2011aThamban et al, &b, 2013PAGES 2k Consortium, 2013;Rahaman et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…Prior to analyses, samples were thawed at room temperature in a Class 100 clean room. Stable isotope ratios of the ice core samples were measured following standard methods using an 'Isoprime' (GV instruments) Isotope Ratio Mass Spectrometer (Naik et al, 2010 a). While two ice cores were extensively studied and published during this period, data from other cores under analysis and interpretation.…”

Section: Resultsmentioning

confidence: 99%

“…Application of the δ 18 O-T spatial slope (1.31‰/°C ) to the δ 18 O profiles of IND-25/B5 and IND-24/ B4 cores facilitated the estimation of surface air temperature in the study area (Naik et al, 2010 a & b;Thamban et al, 2011Thamban et al, a & b & 2013. The oxygen isotope (δ 18 O) records of the IND-22/B4 core supported significant changes in temperature during periods of solar activity as well a warming trend of 2.7 o C for the past 470 years, with an enhanced warming during the last several decades (Thamban et al, 2011(Thamban et al, & 2013.…”

Section: Palaeo-environmental Variability During the Past Five Centuriesmentioning

confidence: 99%

“…In order to assess the temporal isotopic variability of ice cores as high-resolution quantitative proxy record of air temperatures and its relation to the southern hemispheric climatic modes, an ultra-highresolution (>12 samples per year) ice core record was analyzed in relation to instrumental records (Naik et al, 2010 a & b). Comparison of the ice core δ 18 O record with the reconstructed index of SAM for the period 1905 to 2005 was made after a 4-year low pass filtering of both data.…”

Section: Antarctic Climate Variability and Its Linkages To Sam And Ensomentioning

confidence: 99%

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Antarctic Palaeoclimate Reconstruction Using Ice Cores: Indian Initiatives during 2008-2016

Thamban¹

2017

Proceedings of the Indian National Science Academy

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Section: Palaeo-environmental Variability During the Past Five Centuriesmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Palaeo-environmental Variability During the Past Five Centuriesmentioning

confidence: 99%

Section: Antarctic Climate Variability and Its Linkages To Sam And Ensomentioning

confidence: 99%

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Antarctic Palaeoclimate Reconstruction Using Ice Cores: Indian Initiatives during 2008-2016

Thamban¹

2017

Proceedings of the Indian National Science Academy

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Effect of accumulation rate on water stable isotopes of near‐surface snow in inland Antarctica

Fujita

Nakazawa

et al. 2014

JGR Atmospheres

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[1] Postdepositional changes in water stable isotopes in polar firn were investigated at three sites characterized by different accumulation rates along the East Antarctic ice divide near Dome Fuji. Water stable isotopes, major ion concentrations, and tritium contents of three 2-4 m deep pits were measured at high resolution (2 cm). Temporally, the snow pits cover the past 50 years with snow accumulation rates in the range of 29-41 kg m À2 a À1around Dome Fuji. Oxygen isotopic profiles in the three pits do not show annual fluctuations, but instead exhibit multiyear cycles. These multiyear cycles are lower in frequency at Dome Fuji as compared with the other two sites. Peaks of water stable isotopes in the multiyear cycles correspond to some ion concentration minima in the pits, although such relationships are not observed in coastal regions. We propose that the extremely low accumulation environment keeps the snow layer at the near surface, which result in postdepositional modifications of isotopic signals by processes such as ventilation and vapor condensation-sublimation. We estimate that oxygen isotopic ratios could be modified by >10‰ and that the original seasonal cycle could be completely overprinted under the accumulation conditions at Dome Fuji. Moreover, stake measurements at Dome Fuji suggest that the large variability in snow accumulation rate is the cause of the multiyear cycles.Citation: Hoshina, Y., K. Fujita, F. Nakazawa, Y. Iizuka, T. Miyake, M. Hirabayashi, T. Kuramoto, S. Fujita, and H. Motoyama (2014), Effect of accumulation rate on water stable isotopes of near-surface snow in inland Antarctica,

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The evolution and volcanic forcing of the southern annular mode during the past 300 years

Yang

Xiao

2017

Intl Journal of Climatology

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A positive change in the southern annular mode (SAM), which is the primary pattern of climate variability in the Southern Hemisphere, has been induced predominantly by polar stratospheric ozone depletion. However, the lack of long‐term observational records limits our understanding of the long‐term SAM behaviour. In this study, we found that the geochemical record of the LGB69 ice core from the eastern coast of Antarctica was significantly correlated with the winter SAM index (SAMI). In addition, we developed an annual mean SAMI beginning in 1701 based on 15 annually resolved ice cores and relevant proxy–climate relationships. Our reconstruction accounted for 54.8% of the total variance from 1957 to 2000 (the calibration period). We demonstrate that the recent positive phase shift in the annual mean SAMI since the 1970s is unprecedented, with the estimate for the latest regime in the 1990s reaching values 2.5 times the standard deviation above the baseline (1701–2000). This peak value also coincides with the largest 30‐ and 50‐year trends, which have occurred at the end of the 20th century. From the reconstructed SAMI, we also found that the response to large volcanic events was likely positive in the 3 years after the eruption, but this positive response can be masked by internal climate variability when a strong El Niño event occurs in the eruption year.

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

Cited by 33 publications

References 73 publications

Antarctic Palaeoclimate Reconstruction Using Ice Cores: Indian Initiatives during 2008-2016

Antarctic Palaeoclimate Reconstruction Using Ice Cores: Indian Initiatives during 2008-2016

Effect of accumulation rate on water stable isotopes of near‐surface snow in inland Antarctica

The evolution and volcanic forcing of the southern annular mode during the past 300 years

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