Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica
-
Published:2023-10-05
Issue:10
Volume:17
Page:4207-4221
-
ISSN:1994-0424
-
Container-title:The Cryosphere
-
language:en
-
Short-container-title:The Cryosphere
Author:
Hirsch Nora, Zuhr AlexandraORCID, Münch ThomasORCID, Hörhold MariaORCID, Freitag JohannesORCID, Dallmayr Remi, Laepple ThomasORCID
Abstract
Abstract. Stable water isotopologues of snow, firn and ice cores provide valuable information on past climate variations. Yet single profiles are generally not suitable for robust climate reconstructions. Stratigraphic noise, introduced by the irregular deposition, wind-driven erosion and redistribution of snow, impacts the utility of high-resolution isotope records, especially in low-accumulation areas. However, it is currently unknown how stratigraphic noise differs across the East Antarctic Plateau and how it is affected by local environmental conditions.
Here, we assess the amount and structure of stratigraphic noise at seven sites along a 120 km transect on the plateau of Dronning Maud Land, East Antarctica. Replicated oxygen isotope records of 1 m length were used to estimate signal-to-noise ratios as a measure of stratigraphic noise at sites characterised by different accumulation rates (43–64 mm w.e. a−1), snow surface roughnesses and slope inclinations. While we found a high level of stratigraphic noise at all sites, there was also considerable variation between sites. At sastrugi-dominated sites, greater stratigraphic noise coincided with stronger surface roughnesses, steeper slopes and lower accumulation rates, probably related to increased wind speeds. These results provide a first step to modelling stratigraphic noise
and might guide site selection and sampling strategies for future expeditions to improve high-resolution climate reconstructions from low-accumulation regions.
Funder
H2020 European Research Council Helmholtz-Fonds
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference75 articles.
1. Arcone, S., Spikes, V., and Hamilton, G.: Stratigraphic Variation Within
Polar Firn Caused by Differential Accumulation and Ice Flow:
Interpretation of a 400 Mhz Short-Pulse Radar Profile from West
Antarctica, J. Glaciol., 51, 407–422,
https://doi.org/10.3189/172756505781829151, 2005. a, b, c, d 2. Arthern, R. J., Hindmarsh, R. C. A., and Williams, C. R.: Flow speed within the
Antarctic ice sheet and its controls inferred from satellite observations:
FLOW SPEED IN THE ANTARCTIC ICE SHEET, J. Geophys. Res.-Earth Surf., 120, 1171–1188, https://doi.org/10.1002/2014JF003239, 2015. a 3. Barnes, P. R. F., Wolff, E. W., and Mulvaney, R.: A 44 kyr paleoroughness
record of the Antarctic surface, J. Geophys. Res.-Atmos., 111, D03102, https://doi.org/10.1029/2005JD006349, 2006. a 4. Birnbaum, G., Freitag, J., Brauner, R., König-Langlo, G., Schulz, E.,
Kipfstuhl, S., Oerter, H., Reijmer, C. H., Schlosser, E., Faria, S. H., Ries,
H., Loose, B., Herber, A., Duda, M. G., Powers, J. G., Manning, K. W., and
van den Broeke, M. R.: Strong-wind events and their influence on the
formation of snow dunes: observations from Kohnen station, Dronning
Maud Land, Antarctica, J. Glaciol., 56, 891–902, 2010. a, b, c, d, e 5. Black, H. P. and Budd, W.: Accumulation in the Region of Wilkes, Wilkes
Land, Antarctica, J. Glaciol., 5, 3–15,
https://doi.org/10.3189/S0022143000028549, 1964. a, b
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|