Comparison of accumulation rates and stable isotope ratios

Since 1979/80, glaciological studies have been carried out at Ekströmisen, Antarctica, including accumulation-stake measurements, snow-pit and shallow-firn-core studies. Snowstratigraphy, chemical properties and stable-isotope ratios (d18O) were investigated. This study focuses on three cores taken...

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Bibliographic Details
Main Authors: Schlosser, Elisabeth, Oerter, Hans
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
AWI_Glac
AWI_stations
AWI Antarctic Land Expedition
B04
Dronning Maud Land
Antarctica
EPICA_DML3
FB0189
FB9801
FIRN
Firn auger
Glaciology @ AWI
ICEDRILL
Ice drill
Neumayer Station (WMO89002)
NM01C82_04
NM02A92_00
NM02C89_01
NM03A90_00
NM03C98_01
Stake
Antarctic
Neumayer
Neumayer Station
Ekströmisen
Annals of Glaciology
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.690398
https://doi.org/10.1594/PANGAEA.690398
Description
Summary:Since 1979/80, glaciological studies have been carried out at Ekströmisen, Antarctica, including accumulation-stake measurements, snow-pit and shallow-firn-core studies. Snowstratigraphy, chemical properties and stable-isotope ratios (d18O) were investigated. This study focuses on three cores taken between 1982 and 1998. The 1998 core was dated using dielectric profiling, d18O profiles and stake measurements. Accumulation rates showhigh interannual and spatial variability due to the extreme wind influence. No significant trend was found for the last 50 years; during the first half of the 20th century, accumulation decreased. The high spatial and interannual variability, however, means that trends must be interpreted with care. In spite of the highly irregular accumulation distribution, stable-isotope ratios show little spatial variability. The mean annual d18O values of cores B04 and FB0198 agree fairly well for the time period 1955-82 covered by both cores. d18O values have increased during most of the 20th century; since the late 1980s a decrease is observed. This change is not related to air temperature, since mean annual air temperatures at Neumayer show no significant trend over the last two decades.

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