Fifty years of instrumental surface mass balance observations at Vostok Station, central Antarctica

IF 2.8 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Journal of Glaciology Pub Date : 2023-09-04 DOI:10.1017/jog.2023.53

A. Ekaykin, V. Lipenkov, N. Tebenkova

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引用次数: 1

Abstract

We present the surface mass balance (SMB) dataset from Vostok Station's accumulation stake farms which provide the longest instrumental record of its kind obtained with a uniform technique in central Antarctica over the last 53 years. The snow build-up values at individual stakes demonstrate a strong random scatter related to the interaction of wind-driven snow with snow micro-relief. Because of this depositional noise, the signal-to-noise ratio (SNR) in individual SMB time series derived at single points (from stakes, snow pits or firn cores) is as low as 0.045. Averaging the data over the whole stake farm increases the SNR to 2.3 and thus allows us to investigate reliably the climatic variability of the SMB. Since 1970, the average snow accumulation rate at Vostok has been 22.5 ± 1.3 kg m−2 yr−1. Our data suggest an overall increase of the SMB during the observation period accompanied by a significant decadal variability. The main driver of this variability is local air temperature with an SMB temperature sensitivity of 2.4 ± 0.2 kg m−2 yr−1 K−1 (11 ± 2% K−1). A covariation between the Vostok SMB and the Southern Oscillation Index is also observed.

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南极中部沃斯托克站50年地表物质平衡仪器观测

我们提供了来自Vostok站积累场场的地表质量平衡(SMB)数据集，该数据集提供了过去53年来在南极洲中部使用统一技术获得的最长仪器记录。单个桩的雪积值表现出与风驱动雪和雪微地形相互作用有关的强随机散射。由于这种沉积噪声，单点(来自木桩、雪坑或铁芯)的单个SMB时间序列的信噪比(SNR)低至0.045。对整个桩场的数据进行平均，将信噪比提高到2.3，从而使我们能够可靠地研究SMB的气候变异性。自1970年以来，Vostok的平均积雪率为22.5±1.3 kg m−2 yr−1。我们的数据表明，在观测期间，SMB总体增加，并伴有显著的年代际变化。这种变化的主要驱动因素是当地气温，SMB温度敏感性为2.4±0.2 kg m−2 yr−1 K−1(11±2% K−1)。在Vostok SMB和南方涛动指数之间也观察到协变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Glaciology 地学-地球科学综合

CiteScore

5.80

自引率

14.70%

发文量

101

审稿时长

6 months

期刊介绍： Journal of Glaciology publishes original scientific articles and letters in any aspect of glaciology- the study of ice. Studies of natural, artificial, and extraterrestrial ice and snow, as well as interactions between ice, snow and the atmospheric, oceanic and subglacial environment are all eligible. They may be based on field work, remote sensing, laboratory investigations, theoretical analysis or numerical modelling, or may report on newly developed glaciological instruments. Subjects covered recently in the Journal have included palaeoclimatology and the chemistry of the atmosphere as revealed in ice cores; theoretical and applied physics and chemistry of ice; the dynamics of glaciers and ice sheets, and changes in their extent and mass under climatic forcing; glacier energy balances at all scales; glacial landforms, and glaciers as geomorphic agents; snow science in all its aspects; ice as a host for surface and subglacial ecosystems; sea ice, icebergs and lake ice; and avalanche dynamics and other glacial hazards to human activity. Studies of permafrost and of ice in the Earth’s atmosphere are also within the domain of the Journal, as are interdisciplinary applications to engineering, biological, and social sciences, and studies in the history of glaciology.