Gravity measurements with a portable absolute gravimeter A10 in Syowa Station and Langhovde, East Antarctica
Gravity measurements with a portable absolute gravimeter A10 in Syowa Station and Langhovde, East Antarctica
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在东南极洲 Syowa 站和 Langhovde 使用便携式绝对重力计 A10 进行重力测量
DOI：
10.1016/j.polar.2013.07.001
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发表时间：
2013
期刊：
影响因子：
1.8
通讯作者：
K. Shibuya
中科院分区：
文献类型：
--
作者：
T. Kazama;H. Hayakawa;T. Higashi;S. Ohsono;S. Iwanami;T. Hanyu;H. Ota;K. Doi;Y. Aoyama;Y. Fukuda;J. Nishijima;K. Shibuya
日本南极考察队首次在东南极洲使用便携式绝对重力仪A10测量了绝对重力值。本研究旨在通过重复绝对重力测量来研究昭和站周围冰块分布的区域时空变化以及相关的地壳变形，并在南极大陆朗霍夫德南部获得了第一个绝对重力值。朗霍夫德新安装的基准 AGS01 的平均绝对重力值（2012 年 2 月 3 日获得）为 982535584.2 ± 0.7 µgal (1 [μgal] = 1 × 10−8[m/s2])，这与过去 1 mgal 以内的相对重力测量获得的重力值一致。此外，由于与潮汐效应和原子钟频率时间变化相关的数据进行了充分的修正，昭和站AGSaux获得的平均绝对重力值与之前的绝对重力值以及使用FG5重力计同时测量获得的绝对重力值一致。为了探测与冰体变化和其他构造现象相关的重力变化，我们计划在不久的将来再次在AGS01以及昭和站周围的其他观测点进行绝对重力测量，并密切关注南极洲恶劣的环境条件对重力数据采集的影响。
Absolute gravity values were measured with a portable absolute gravimeter A10 in East Antarctica, for the first time by the Japanese Antarctic Research Expedition. This study aims to investigate regional spatiotemporal variations of ice mass distributions and associated crustal deformations around Syowa Station by means of repeated absolute gravity measurements, and we obtained the first absolute gravity value in Southern Langhovde on the Antarctic Continent. The average absolute gravity value at the newly installed benchmark AGS01 in Langhovde (obtained on 3 February 2012) was 982535584.2 ± 0.7 μgal (1 [μgal] = 1 × 10−8[m/s2]), which was in agreement with the gravity values obtained by the past relative gravity measurements within 1 mgal. In addition, the average absolute gravity value obtained at AGSaux in Syowa Station was consistent with both previous absolute gravity values and those obtained by simultaneous measurements using an FG5 gravimeter, owing to adequate data corrections associated with tidal effects and time variations in atomic clock frequencies. In order to detect the gravity changes associated with the ice mass changes and other tectonic phenomena, we plan to conduct absolute gravity measurements at AGS01 again and at other campaign sites around Syowa Station as well in the near future, with careful attention paid to the impacts of severe environmental conditions in Antarctica on gravity data collection.