scholarly journals Surface Mass-Balance Variability Near “Byrd” Station, Antarctica, and its Importance to Ice Core Stratigraphy

1978 ◽  
Vol 20 (83) ◽  
pp. 301-310 ◽  
Author(s):  
I. M. Whillans
Keyword(s):  
Mass Balance ◽  
Oxygen Isotope ◽  
Isotope Ratio ◽  
Snow Accumulation ◽  
Surface Mass Balance ◽  
Oxygen Isotope Ratio ◽  
Surface Microrelief ◽  
Stable Oxygen Isotope ◽  
Surface Mass ◽  
Stable Oxygen

AbstractThe local variability in surface mass balance (net snow accumulation) up-glacier from "Byrd" station, Antarctica, is due to the combined effects of year-to-year "climate" variations and of the surface microrelief clue to snow drifts and sastrugi. These variabilities are consistent with the variability in surface mass balance obtained from core stratigraphy (Gow, 1968), and are used in a discussion of the difficulties encountered with the deep "Byrd" station core in detecting annual layering by the stable oxygen-isotope ratio and the microparticle concentration techniques. The recognition of annual layers by these techniques requires that the snows of certain seasons be present in the measured section, but near "Byrd" station the microrclief is such that summer snow layers are not horizontally continuous and may be absent from a given section. At other sites on ice sheets, where the microrelief is less (less wind activity) or where the surface mass balance is larger, or both, less difficulty is anticipated in using the stable oxygen-isotope ratio and micro-particle-concentration techniques to identify annual layers.

scholarly journals Surface Mass-Balance Variability Near “Byrd” Station, Antarctica, and its Importance to Ice Core Stratigraphy

1978 ◽  
Vol 20 (83) ◽  
pp. 301-310 ◽  
Author(s):  
I. M. Whillans
Keyword(s):  
Mass Balance ◽  
Oxygen Isotope ◽  
Isotope Ratio ◽  
Snow Accumulation ◽  
Surface Mass Balance ◽  
Oxygen Isotope Ratio ◽  
Surface Microrelief ◽  
Stable Oxygen Isotope ◽  
Surface Mass ◽  
Stable Oxygen

AbstractThe local variability in surface mass balance (net snow accumulation) up-glacier from "Byrd" station, Antarctica, is due to the combined effects of year-to-year "climate" variations and of the surface microrelief clue to snow drifts and sastrugi. These variabilities are consistent with the variability in surface mass balance obtained from core stratigraphy (Gow, 1968), and are used in a discussion of the difficulties encountered with the deep "Byrd" station core in detecting annual layering by the stable oxygen-isotope ratio and the microparticle concentration techniques. The recognition of annual layers by these techniques requires that the snows of certain seasons be present in the measured section, but near "Byrd" station the microrclief is such that summer snow layers are not horizontally continuous and may be absent from a given section. At other sites on ice sheets, where the microrelief is less (less wind activity) or where the surface mass balance is larger, or both, less difficulty is anticipated in using the stable oxygen-isotope ratio and micro-particle-concentration techniques to identify annual layers.

scholarly journals The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces

2018 ◽  
Vol 32 (9) ◽  
pp. 703-710 ◽  
Author(s):  
Steven J. Granger ◽  
Yuguo Yang ◽  
Verena Pfahler ◽  
Chris Hodgson ◽  
Andrew C. Smith ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Ratio ◽  
Oxygen Isotope Ratio ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen ◽  
Cattle Faeces

scholarly journals Surface mass balance and stable oxygen isotope ratios from shallow firn cores on Fimbulisen, East Antarctica

2012 ◽  
Vol 53 (60) ◽  
pp. 70-78 ◽  
Author(s):  
E. Schlosser ◽  
H. Anschütz ◽  
E. Isaksson ◽  
T. Martma ◽  
D. Divine ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Mass Balance ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Surface Mass Balance ◽  
Accumulation Rates ◽  
Stable Oxygen Isotope ◽  
Surface Mass ◽  
Oxygen Isotope Ratios ◽  
Stable Oxygen

AbstractThe mass balance of Antarctica is one of the crucial factors for determining sea-level change in a warming climate. The marginal zones of the continent, namely the ice shelves, are most sensitive to climate change. During the 2009/10 austral summer an extensive glaciological field campaign was carried out on Fimbulisen, an ice shelf in East Antarctica, to investigate its recent surface mass balance. Shallow (10–18 m) firn cores were drilled and accumulation rates and stable-isotope ratios determined. For firn-core dating, two different methods were compared: (1) seasonal variations of stable oxygen isotope ratios (δ18O), and (2) dielectric profiling, including using the volcanic eruptions of Pinatubo, Philippines (1991), and El Chichόn, Mexico (1982), as time markers. The mean annual accumulation for the period 1992–2009 ranges from 298 to 349 mmw.e. a–1. The interannual variability at the drilling sites is >30%. Accumulation rates show a weak decreasing trend during the past 20–30 years, which is statistically significant only for one of the cores. Stable-isotope ratios were compared to the snowfall temperature of Neumayer station. Neither the temperatures nor the δ18O values show any trend for the investigated time period.

scholarly journals Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra firme forest

Oecologia ◽  
2015 ◽  
Vol 180 (3) ◽  
pp. 685-696 ◽  
Author(s):  
Shinta Ohashi ◽  
Flávia M. Durgante ◽  
Akira Kagawa ◽  
Takuya Kajimoto ◽  
Susan E. Trumbore ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Seasonal Variations ◽  
Isotope Ratio ◽  
Annual Rings ◽  
Oxygen Isotope Ratio ◽  
Wood Cellulose ◽  
Terra Firme ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen ◽  
Terra Firme Forest

scholarly journals Temperature versus species-specific influences on the stable oxygen isotope ratio of tree rings

Trees ◽  
2009 ◽  
Vol 23 (4) ◽  
pp. 801-811 ◽  
Author(s):  
Christina E. Reynolds-Henne ◽  
Matthias Saurer ◽  
Rolf T. W. Siegwolf
Keyword(s):  
Oxygen Isotope ◽  
Tree Rings ◽  
Isotope Ratio ◽  
Oxygen Isotope Ratio ◽  
Stable Oxygen Isotope ◽  
Stable Oxygen ◽  
Species Specific

scholarly journals Reconstruction of historical surface mass balance, 1984–2017 from GreenTrACS multi-offset ground-penetrating radar

2020 ◽  
pp. 1-10
Author(s):  
Tate G. Meehan ◽  
H. P. Marshall ◽  
John H. Bradford ◽  
Robert L. Hawley ◽  
Thomas B. Overly ◽  
...  
Keyword(s):  
Mass Balance ◽  
Ground Penetrating Radar ◽  
Greenland Ice Sheet ◽  
Snow Accumulation ◽  
Surface Mass Balance ◽  
Snow Density ◽  
Surface Mass ◽  
Age Model ◽  
Ground Penetrating ◽  
Good Agreement

Abstract We present continuous estimates of snow and firn density, layer depth and accumulation from a multi-channel, multi-offset, ground-penetrating radar traverse. Our method uses the electromagnetic velocity, estimated from waveform travel-times measured at common-midpoints between sources and receivers. Previously, common-midpoint radar experiments on ice sheets have been limited to point observations. We completed radar velocity analysis in the upper ~2 m to estimate the surface and average snow density of the Greenland Ice Sheet. We parameterized the Herron and Langway (1980) firn density and age model using the radar-derived snow density, radar-derived surface mass balance (2015–2017) and reanalysis-derived temperature data. We applied structure-oriented filtering to the radar image along constant age horizons and increased the depth at which horizons could be reliably interpreted. We reconstructed the historical instantaneous surface mass balance, which we averaged into annual and multidecadal products along a 78 km traverse for the period 1984–2017. We found good agreement between our physically constrained parameterization and a firn core collected from the dry snow accumulation zone, and gained insights into the spatial correlation of surface snow density.

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