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  • 1
    Online Resource
    Online Resource
    Late-Holocene East Antarctic climate trends from ice-core and lake-sediment proxies
    SAGE Publications ; 2001
    In:  The Holocene Vol. 11, No. 1 ( 2001-01), p. 117-120
    Details
    In: The Holocene, SAGE Publications, Vol. 11, No. 1 ( 2001-01), p. 117-120
    Abstract: A high-resolution record of evaporation for the last 650 years was derived from the diatom-salinity signal preserved in a sediment core taken from Ace Lake, Vestfold Hills (68° 28's, 78° 11'E), Antarctica. The seasonal oxygen isotope signal preserved in an ice core from Law Dome (66° 44'S, 112° 50'E), Antarctica, revealed a high-resolution summer temperature record for the same time period. The two proxies show highly correlated behaviour despite having significantly different climatic response mechanisms and a large geographic separation. The correlation observed between proxies based on such differing processes and analytical method ologies provides not only a climate record for the past 650 years that is both robust and regionally representative of coastal East Antarctica but also confirmation of the utility of reconstructions using these methods.
    Type of Medium: Online Resource
    ISSN: 0959-6836 , 1477-0911
    URL: Article
    DOI: 10.1191/095968301677143452
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2001
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  • 2
    Online Resource
    Online Resource
    Snowfall increase in coastal East Antarctica linked with southwest Western Australian drought
    Springer Science and Business Media LLC ; 2010
    In:  Nature Geoscience Vol. 3, No. 4 ( 2010-4), p. 267-272
    Details
    In: Nature Geoscience, Springer Science and Business Media LLC, Vol. 3, No. 4 ( 2010-4), p. 267-272
    Type of Medium: Online Resource
    ISSN: 1752-0894 , 1752-0908
    URL: Article
    DOI: 10.1038/ngeo761
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2010
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  • 3
    Online Resource
    Online Resource
    Correction to “Calibrating the ice core paleothermometer using seasonality” by Tas D. van Ommen and Vin Morgan
    American Geophysical Union (AGU) ; 1997
    In:  Journal of Geophysical Research: Atmospheres Vol. 102, No. D25 ( 1997-12-27), p. 30165-30165
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 102, No. D25 ( 1997-12-27), p. 30165-30165
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/97JD02336
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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  • 4
    Online Resource
    Online Resource
    Variations in shear deformation rate with depth at Dome Summit South, Law Dome, East Antarctica
    International Glaciological Society ; 1998
    In:  Annals of Glaciology Vol. 27 ( 1998), p. 135-139
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 27 ( 1998), p. 135-139
    Abstract: The variation of shear deformation rate with depth at the Dome Summit South (DSS) site, 4.7 km (~4 ice thicknesses) from the summit of Law Dome, East Antarctica, has been determined by repeated borehole inclination measurement. The results show that from the surface down to 1000m (ice-equivalent depth! deformation rates increase as expected with the increase in stress, temperature and the development of stronger ice-crystal fabrics. There is a broad maximum in strain rate around 1000 m. Below this depth, strain rates decrease, with values in the basal ice ~1/3 of those at 1000 m. in DSS, Holocene ice with low, uniform impurity levels extends to a depth of 1110 m, so the decrease in shear rale below 1000 m is attributed not to any change in properties of the ice, but to shear stress reduction induced by the large-scale retarding effect of local bedrock hills. Below 1000 m, with in the zone of retarded flow, there is a narrow spike, 14 m thick, in which the shear rate is ~5 times that in the ice immediately above and below. The shear-rate spike corresponds in depth to ice with high dust concentrations, small crystal size and strong vertical c-axis fabrics that was deposited at the Last Glaciol Maximum. A surface velocity of 1.98 ± 0.03 m a −1 obtained by integration of shear rate over the borehole depth is in agreement with the value of 2.04 ± 0.11m a −1 obtained by the global positioning system. The ratio of average column velocity to surface velocity determined by the borehole measurements is 0.74. A value of 0.76 is obtained from mass-balance considerations.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/1998AoG27-1-135-139
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 1998
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  • 5
    Online Resource
    Online Resource
    Intercomparison of firn core and meteorological data
    Cambridge University Press (CUP) ; 2001
    In:  Antarctic Science Vol. 13, No. 3 ( 2001-09), p. 329-337
    Details
    In: Antarctic Science, Cambridge University Press (CUP), Vol. 13, No. 3 ( 2001-09), p. 329-337
    Abstract: High resolution firn core records of the oxygen isotope ratio (δ 18 O) and trace chemical species were extracted from a high accumulation site on Law Dome, East Antarctica. Inter-core comparisons were conducted and regional events identified in cores 5 km apart. High resolution dating of one of the firn cores was established using a co-located Automatic Weather Station (AWS) equipped with a snow accumulation sensor, allowing dating of individual precipitation events in the firn core record. Variations in the δ 18 O and trace chemical records were compared with meteorological conditions at the mesoscale and the synoptic-scale. Particular focus was given to an abrupt change in sea salt concentrations and δ 18 O within a depth range that appears from AWS accumulation data to have been deposited over a 24 hour period. The abrupt change in the firn core record was found to be consistent with an abrupt change in meteorological conditions. Direct comparisons between high resolution firn core records and meteorological conditions will greatly facilitate the interpretation of signals preserved in deep ice cores.
    Type of Medium: Online Resource
    ISSN: 0954-1020 , 1365-2079
    URL: Article
    DOI: 10.1017/S0954102001000463
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2001
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  • 6
    Online Resource
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    High‐precision dating of volcanic events (A.D. 1301–1995) using ice cores from Law Dome, Antarctica
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Atmospheres Vol. 106, No. D22 ( 2001-11-27), p. 28089-28095
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 106, No. D22 ( 2001-11-27), p. 28089-28095
    Abstract: A record of volcanic activity over the period A.D. 1301–1995 has been extracted from three Law Dome ice cores (East Antarctica). The record dating is unambiguous at the annual level from A.D. 1807 to 1995 and has an uncertainty of ±1 year at A.D. 1301. Signals from 20 eruptions are preserved in the record, including those of two unknown eruptions with acid deposition beginning in A.D. 1810.8 and A.D. 1685.8. The beginning of the ice core signal from the A.D. 1815 Tambora eruption is observed in the austral summer of A.D. 1816/1817. The mean observed stratospheric transport and deposition time to Law Dome from the eruption site is 1.5 years (σ = 0.6 years) from 11 well‐dated eruptions. The largest eruption observed in the Law Dome record has its maximum in A.D. 1460 with volcanic sulfate deposition beginning in the austral winter of A.D. 1459. This event is also observed in other ice core records and is attributed to the volcano Kuwae, with an eruption date in the range A.D. 1455.9–1459.9 if all sources of error are considered. This is at least three years later than the date previously ascribed by dendrochronological and historical studies.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2001JD000330
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Peroxide concentrations in the Dome Summit South ice core, Law Dome, Antarctica
    American Geophysical Union (AGU) ; 1996
    In:  Journal of Geophysical Research: Atmospheres Vol. 101, No. D10 ( 1996-06-27), p. 15147-15152
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 101, No. D10 ( 1996-06-27), p. 15147-15152
    Abstract: Measurements of H 2 O 2 concentrations have been made at intervals along the full length of the Dome Summit South (DSS) ice core from Law Dome, Antarctica. These results show mean peroxide concentrations of approximately 37 parts per billion by mass over the past 4 kyr and a tendency for concentrations to decrease with age. The rate of H 2 O 2 decay in Antarctic ice appears slower than in Greenland ice and the pattern of measurements suggests an abrupt increase in concentration during the emergence from the last glacial into the Holocene. There is some evidence for a recent increase in H 2 O 2 , but the data so far are not conclusive. Detailed examination of the timing of the seasonality in H 2 O 2 and δ 18 O shows that peroxide extrema occur very near the solstices. These seasonal curves have been used to derive atmospheric seasonal H 2 O 2 curves based on possible air‐snow partitioning models. These show a broad low in atmospheric concentration with a sharp peak which is again very near the summer solstice.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/96JD00838
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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  • 8
    Online Resource
    Online Resource
    Seasonal characteristics of the major ions in the high-accumulation Dome Summit South ice core, Law Dome, Antarctica
    International Glaciological Society ; 1998
    In:  Annals of Glaciology Vol. 27 ( 1998), p. 385-390
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 27 ( 1998), p. 385-390
    Abstract: Seasonal cycles of the chemical species Na + , Κ + , Mg 2+ , Ca 2+ , CH 3 SO 3 (MSA) Cl − NO 3 − and NO 3 − in the Dome Summit South (DSS) ice core from Law Dome were measured for a number of epochs (AD 1809-15, 1821-31 1980-92) span-nine a total of 28 years. These preliminary trace-chemical patterns show that the DSS site is mainly affected by marine air. The main features found in the seasonal pattern of sea-salt concentrations (e.g. Na + , Cl − and Mg 2+ ) were a winter peak and a summer minimum. The variations in sea salts are believed to reflect aerosol production and transport due to the level of storminess, and are less affected by sea-ice extent. The seasonal cycles of marine biogenic compounds, non-sea-salt SO 4 2- and MSA are in good agreement. They show a characteristic summer maximum arid a winter minimum, due to variations in biological activity. While the main sources of nitrate in polar snow remain unclear, the seasonal signal, including sub-seasonal structure, at DSS resembles that found m the atmosphere at coastal Antarctic sites. However, the timing of the nitrate maximum is different in the ice-core record compared with the aerosol records. Overall, the results indicate that the DSS core, with sub-seasonal resolution, contains a sensitive reco rd for investigating climate variability.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/1998AoG27-1-385-390
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 1998
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    SSG: 14
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  • 9
    Online Resource
    Online Resource
    Seasonal characteristics of the major ions in the high-accumulation Dome Summit South ice core, Law Dome, Antarctica
    International Glaciological Society ; 1998
    In:  Annals of Glaciology Vol. 27 ( 1998), p. 385-390
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 27 ( 1998), p. 385-390
    Abstract: Seasonal cycles of the chemical species Na + , Κ + , Mg 2+ , Ca 2+ , CH 3 SO 3 (MSA) Cl − NO 3 − and NO 3 − in the Dome Summit South (DSS) ice core from Law Dome were measured for a number of epochs (AD 1809-15, 1821-31 1980-92) span-nine a total of 28 years. These preliminary trace-chemical patterns show that the DSS site is mainly affected by marine air. The main features found in the seasonal pattern of sea-salt concentrations (e.g. Na + , Cl − and Mg 2+ ) were a winter peak and a summer minimum. The variations in sea salts are believed to reflect aerosol production and transport due to the level of storminess, and are less affected by sea-ice extent. The seasonal cycles of marine biogenic compounds, non-sea-salt SO 4 2- and MSA are in good agreement. They show a characteristic summer maximum arid a winter minimum, due to variations in biological activity. While the main sources of nitrate in polar snow remain unclear, the seasonal signal, including sub-seasonal structure, at DSS resembles that found m the atmosphere at coastal Antarctic sites. However, the timing of the nitrate maximum is different in the ice-core record compared with the aerosol records. Overall, the results indicate that the DSS core, with sub-seasonal resolution, contains a sensitive record for investigating climate variability.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.1017/S0260305500017778
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 1998
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    SSG: 14
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  • 10
    Online Resource
    Online Resource
    Calibrating the ice core paleothermometer using seasonality
    American Geophysical Union (AGU) ; 1997
    In:  Journal of Geophysical Research: Atmospheres Vol. 102, No. D8 ( 1997-04-27), p. 9351-9357
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 102, No. D8 ( 1997-04-27), p. 9351-9357
    Abstract: High‐resolution oxygen isotope measurements on the Dome Summit South (DSS) ice core from Law Dome, Antarctica, provide a seasonal profile that is sufficiently stable and undistorted by biases in accumulation to permit comparison with measured temperature seasonality. This comparison yields an isotope‐temperature relation with a gradient (dδ/dT) of 0.44±0.02‰/°C and provides a new method for exploring the isotope‐temperature relationship at high‐accumulation sites. If applied to the observed isotope record from the DSS core, which extends through the last glacial and beyond, this calibration suggests that at its coldest the last glaciation was ∼13°C colder than present at this site (after correcting for elevation change). This finding compares with a temperature difference of ∼8°C computed by using the local spatially derived calibration.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/96JD04014
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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    SSG: 16,13
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