Oxygen-Isotope and Total Beta-Radioactivity Measurements on 10 m Ice Cores from the Antarctic Peninsula

Peel, David; Clausen, Henrik

doi:10.3189/s0022143000011783

Cited by 27 publications

(34 citation statements)

References 15 publications

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“…A more complete set of values was obtained by using the close relationship between tempe r atu re and the isotope ratio of precipitation, studied by Peel and Clausen (1982) .…”

Section: Accumulation Datamentioning

confidence: 99%

Glaciological and Oceanographic Calculations of the Mass Balance and Oxygen Isotope Ratio of a Melting Ice Shelf

1984

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ABSTRACT. Glaciological es tim a tes of the ice supply to George VI Ice Shelf a re obtained by integrating th e accumu la tion over the ca tchment. The basal melt (or possible shelf thic kening) rates for the ice shelf are calcul ated by ba lancing the acc umulatio n with calving and melting. We calcula te a n average equilibrium melt rate for the ice shelf of2 m a -'. If the ice shelf is in mass balance it alone provid es 53 km 3 a -1 melt fro m its base compared to a total for Antarctica of on ly 320 km'a -' .The mean oxygen isotope com positio n of recent accumul ation on the catchment is det ermined by using accumulation and isotope data, supplemented by temperature measurements and a close empirical relationship between iso tope rati o and temperature . The catchment has a mea n isotope ratio of -20.8%0 relative to SMOW.O ceanog raphi c wo rk has previo usly shown that the sea-water under the ice shelf at th e north of Geo rge VI So und is Warm Deep Water modifi ed by melting ice. Th e melting ice has an isotope ratio of -20.3%0 . The good agreement in isotope rati os suggest tha t th e melting ice is from th e catchment and beca use th e basal ice of George VI Ice Shelf re p resents acc umulation over lh e last few millenni a the implica tion is that there has been no systemati c change in the isotope compositi on of th e accumu latio n during thi s peri od . This implies no sec ular c hange in eith er th e eleva ti on o r the climatic tempe raLUre of thi s part of th e ice sheet. R ESUME. Calculs glaciologigues el oceanographiques du bilall de masse el du pourcenlage de l'isolope de I'oxygene pour

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“…A more complete set of values was obtained by using the close relationship between tempe r atu re and the isotope ratio of precipitation, studied by Peel and Clausen (1982) .…”

Section: Accumulation Datamentioning

confidence: 99%

Glaciological and Oceanographic Calculations of the Mass Balance and Oxygen Isotope Ratio of a Melting Ice Shelf

1984

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“…We therefore do not consider accumulation measurements made on George VI Ice Shelf relevant to the WIS. There remain only a few measurements in the area of WIS. Peel and Clausen (1982) The data are too sparse to extract any geographical trend reliably. They are, however, compatible with the thesis that the prevailing moisture transport from the Bellingshausen Sea causes unusually high accumulation rates close to the western sea-board.…”

Section: Accuntulation Lileasurelilentsmentioning

confidence: 99%

A synthesis of remote sensing data on Wilkins Ice Shelf, Antarctica

et al. 1993

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Wilkins Ice Shelf has an area of 16000 km2 and lies off the west coast of the Antarctic Peninsula bounded by Alexander, Latady, Charcot and Rothschild islands. Several ice shelves, including Wilkins, exist close to a climatic limit of viability. The recent disintegration of the neighbouring Wordie Ice Shelf has been linked to atmopsheric warming observed on the Antarctic Peninsula. The limit of ice-shelf viability thus appears to have migrated south. Should this continue, the question arises; how long will Wilkins Ice Shelf survive? Compared with the other ice shelves on the Antarctic Peninsula, few surface glaciological data have been collected on Wilkins Ice Shelf. We compare, contrast and combine a variety of remotely sensed data: the recently declassified GEOSAT Geodetic Mission altimetry, Landsat MSS and TM imagery, and radio-echo sounding data (RES), to study its structure and mass balance regime. We find that this shelf has an unusual mass balance regime and relies heavily for sustenance on in situ accumulation. Its response to a continued atmospheric warming may be significantly different from that of Wordie Ice Shelf. Wordie Ice Shelf was fed by several dynamic outlet glaciers which accelerated the disintegration process when the ice shelf fractured. Wilkins Ice Shelf by contrast is almost stagnant and is expected to respond by normal calving at the ice front. Changes in the accumulation rate or basal melt-rate may, however, dominate any dynamic effect. Over the last two decades the ice front positions have remained stable.

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“…This was done in a tent to avoid direct sunlight and wind. The cores were cut so that at least 10-20 samples per annual layer could be obtained (Peel and Clausen, 1982). Based on previous work in the area (Orheim and others, 1986),5 cm samples were considered to be appropriate for the coastal sites, and the sample size was successively decreased to 1.5 cm at the Amundsenisen site.…”

Section: Firn Coresmentioning

confidence: 99%

Spatial and temporal patterns in snow accumulation, western Dronning Maud Land, Antarctica

Isaksson

Karlén

1994

J. Glaciol.

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ABSTRACT. During the Swedish Antarctic Expedition to Dronning MaudLand, Antarctica, 1988-89 the net accumulation was estimated for an area from the coast to about 400 km inland. Stake measurements were used to obtain the spatial variability and firn cores were used for the temporal variability. The mean annual accumulation for the period 1976-88 is about 0.4 m w.e. for Riiser-Larsenisen and about 0.3 m w.e. for the area above the grounding line. The accumulation rate at higher altitudes, > 2500 m a.s.!., is about 0.1 m w.e. for 1955-88. One record from the ice shelf covers the period 1957-88, and suggests an increase in accumulation of about 12%. Between 1976 and, the accumulation has decreased by about 50%, most likely due to lower temperatures as suggested by the temperature record from Halley.

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Oxygen-Isotope and Total Beta-Radioactivity Measurements on 10 m Ice Cores from the Antarctic Peninsula

Cited by 27 publications

References 15 publications

Glaciological and Oceanographic Calculations of the Mass Balance and Oxygen Isotope Ratio of a Melting Ice Shelf

Glaciological and Oceanographic Calculations of the Mass Balance and Oxygen Isotope Ratio of a Melting Ice Shelf

A synthesis of remote sensing data on Wilkins Ice Shelf, Antarctica

Spatial and temporal patterns in snow accumulation, western Dronning Maud Land, Antarctica

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