scholarly journals 2000 years of annual ice core data from Law Dome, East Antarctica

2022 ◽  
Author(s):  
Lenneke M. Jong ◽  
Christopher T. Plummer ◽  
Jason L. Roberts ◽  
Andrew D. Moy ◽  
Mark A. J. Curran ◽  
...  
Keyword(s):  
High Resolution ◽  
Ice Core ◽  
Snow Accumulation ◽  
East Antarctica ◽  
Water Isotopes ◽  
Stable Water Isotopes ◽  
High Resolution Data ◽  
Data Centre ◽  
Level 1 ◽  
Resolution Data

Abstract. Ice core records from Law Dome in East Antarctica, collected over the the last three decades, provide high resolution data for studies of the climate of Antarctica, Australia and the Southern and Indo-Pacific Oceans. Here we present a set of annually dated records of trace chemistry, stable water isotopes and snow accumulation from Law Dome covering over the period from −11 to 2017 CE (1961 to −66 BP 1950), as well as the level 1 chemistry data from which the annual chemistry records are derived. This dataset provides an update and extensions both forward and back in time of previously published subsets of the data, bringing them together into a coherent set with improved dating. The data are available for download from the Australian Antarctic Data Centre at https://doi.org/10.26179/5zm0-v192.

scholarly journals Ultra-high resolution snapshots of three multi-decadal periods in an Antarctic ice core

2016 ◽  
Vol 62 (231) ◽  
pp. 31-36 ◽  
Author(s):  
SKYLAR A. HAINES ◽  
PAUL A. MAYEWSKI ◽  
ANDREI V. KURBATOV ◽  
KIRK A. MAASCH ◽  
SHARON B. SNEED ◽  
...  
Keyword(s):  
High Resolution ◽  
Inductively Coupled Plasma ◽  
Decadal Variability ◽  
Ice Core ◽  
Late Glacial ◽  
Snow Accumulation ◽  
High Resolution Data ◽  
Annual Layer ◽  
Age Model ◽  
Chemical Inputs

ABSTRACTWe offer the first sub-seasonal view of glacial age archives from the Siple Dome-A (SDMA) ice core using the ultra-high resolution capabilities of a newly developed laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS; 121 µm sampling resolution) system capable of conducting multi-element glaciochemical analysis. Our ultra-high resolution data demonstrates that: (1) the SDMA ice core record can be annually dated based on seasonality in chemical inputs at a depth not previously possible using previous glaciochemical sampling methods, (2) winter accumulation at the SD site was greater than summer accumulation during the three late glacial periods selected (~15.3, 17.3, 21.4 Ka ago) in this study and (3) resulting annual layer thicknesses results show greater variability than the current SD ice core depth/age model (Brook and others, 2005), possibly due to depositional effects such as wind scouring and/or decadal variability in snow accumulation that is not captured by the resolution of the current depth/age model.

Using high resolution data to reveal depth-dependent mechanisms that drive land subsidence: The Venice coast, Italy

2009 ◽  
Vol 474 (1-2) ◽  
pp. 271-284 ◽  
Author(s):  
L. Tosi ◽  
P. Teatini ◽  
L. Carbognin ◽  
G. Brancolini
Keyword(s):  
High Resolution ◽  
Land Subsidence ◽  
High Resolution Data ◽  
Resolution Data

Estimating maize lethal necrosis (MLN) severity in Kenya using multispectral high-resolution data

2021 ◽  
Author(s):  
Kyalo Richard ◽  
Elfatih M. Abdel-Rahman ◽  
Sevgan Subramanian ◽  
Johnson O. Nyasani ◽  
Michael Thiel ◽  
...  
Keyword(s):  
High Resolution ◽  
High Resolution Data ◽  
Resolution Data

Reconstructing Antarctic snow accumulation using nitrogen isotopes of nitrate

2021 ◽  
Author(s):  
Pete D. Akers ◽  
Joël Savarino ◽  
Nicolas Caillon ◽  
Mark Curran ◽  
Tas Van Ommen
Keyword(s):  
Nitrogen Isotopes ◽  
Full Range ◽  
Ice Core ◽  
Ice Cores ◽  
Snow Accumulation ◽  
East Antarctica ◽  
Accumulation Rates ◽  
Sea Levels ◽  
Antarctic Snow ◽  
Parallel Reconstruction

<p>Precise Antarctic snow accumulation estimates are needed to understand past and future changes in global sea levels, but standard reconstructions using water isotopes suffer from competing isotopic effects external to accumulation. We present here an alternative accumulation proxy based on the post-depositional photolytic fractionation of nitrogen isotopes (d<sup>15</sup>N) in nitrate. On the high plateau of East Antarctica, sunlight penetrating the uppermost snow layers converts snow-borne nitrate into nitrogen oxide gas that can be lost to the atmosphere. This nitrate loss favors <sup>14</sup>NO<sub>3</sub><sup>-</sup> over <sup>15</sup>NO<sub>3</sub><sup>-</sup>, and thus the d<sup>15</sup>N of nitrate remaining in the snow will steadily increase until the nitrate is eventually buried beneath the reach of light. Because the duration of time until burial is dependent upon the rate of net snow accumulation, sites with lower accumulation rates have a longer burial wait and thus higher d<sup>15</sup>N values. A linear relationship (r<sup>2</sup> = 0.86) between d<sup>15</sup>N and net accumulation<sup>-1</sup> is calculated from over 120 samples representing 105 sites spanning East Antarctica. These sites largely encompass the full range of snow accumulation rates observed in East Antarctica, from 25 kg m-<sup>2</sup> yr<sup>-1</sup> at deep interior sites to >400 kg m-<sup>2</sup> yr<sup>-1</sup> at near coastal sites. We apply this relationship as a transfer function to an Aurora Basin ice core to produce a 700-year record of accumulation changes. Our nitrate-based estimate compares very well with a parallel reconstruction for Aurora Basin that uses volcanic horizons and ice-penetrating radar. Continued improvements to our database may enable precise independent estimates of millennial-scale accumulation changes using deep ice cores such as EPICA Dome C and Beyond EPICA-Oldest Ice.</p>

scholarly journals Separating Geophysical Signals Using GRACE and High‐Resolution Data: A Case Study in Antarctica

2018 ◽  
Vol 45 (22) ◽  
pp. 12,340-12,349 ◽  
Author(s):  
Olga Engels ◽  
Brian Gunter ◽  
Riccardo Riva ◽  
Roland Klees
Keyword(s):  
High Resolution ◽  
High Resolution Data ◽  
Resolution Data
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