Temporal and spatial variability of surface mass balance at Dome Fuji, East Antarctica, by the stake method from 1995 to 2006
Temporal and spatial variability of surface mass balance at Dome Fuji, East Antarctica, by the stake method from 1995 to 2006
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DOI：
10.3189/002214308784409062
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发表时间：
2008
影响因子：
3.4
通讯作者：
T. Kameda;H. Motoyama;S. Fujita;Shuhei Takahashi
中科院分区：
文献类型：
--
作者：
T. Kameda;H. Motoyama;S. Fujita;Shuhei Takahashi
摘要/ Abstract摘要：1995 - 2006年，利用36根竹桩（6 × 6栅格，间隔20 m）估算了东南极洲Dome Fuji的地表质量平衡（SMB）。在1995年、1996年、1997年和2003年，每月两次以0.5厘米的分辨率测量桩顶距离雪表面的高度，在研究期间的其余时间每年测量一次。为了考虑积雪沉降，测量期间桩基的平均积雪密度用于将桩基高度数据转换为SMB。1995 ~ 2006年，富士巨蛋的年SMB值为27.3±1.5 kg m−2 a−1。这一结果与从公元1260年到1993年的年SMB值（26.4 kg m−2 a−1）吻合得很好。在1995-2006年期间，有37个（8.6%的测量）年度SMB结果为负或为零。年SMB多年平均值的变化随观测年数的平方根而减小，单桩观测10年的年SMB估计精度为±10%。分析了年度和月度中小企业的频率分布。这些发现阐明了富士圆顶每年和每月的SMB的复杂行为，这将是南极冰盖内部低积雪地区的常见现象。
Abstract The surface mass balance (SMB) at Dome Fuji, East Antarctica, was estimated using 36 bamboo stakes (grid of 6 × 6, placed at 20 m intervals) from 1995 to 2006. The heights of the stake tops from the snow surface were measured at 0.5 cm resolution twice monthly in 1995, 1996, 1997 and 2003, and once a year for the rest of the study period. To account for snow settling, the average snow density at the stake base during the measurements was used for converting the stake-height data to SMB. The annual SMB from 1995 to 2006 at Dome Fuji was 27.3 ± 1.5 kg m−2 a−1. This result agrees well with the annual SMB from AD 1260 to 1993 (26.4 kg m−2 a−1) estimated from volcanic signals in the Dome Fuji ice core. Over the period 1995–2006, there were 37 (8.6% of the measurements) negative or zero annual SMB results. Variation in the multi-year averages of annual SMB decreased with the square root of the number of observation years, and 10 years of observations of a single stake allowed the estimation of annual SMB at ±10% accuracy. The frequency distributions of annual and monthly SMB were examined. The findings clarify the complex behavior of the annual and monthly SMB at Dome Fuji, which will be common phenomena in areas of low snow accumulation of the interior of the Antarctic ice sheet.