Juneau Icefield Mass Balance Program 1946–2011
Juneau Icefield Mass Balance Program 1946–2011
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朱诺冰原质量平衡计划 1946–2011
DOI：
10.5194/essd-5-319-2013
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发表时间：
2013
影响因子：
11.4
通讯作者：
C. McNeil
中科院分区：
文献类型：
--
作者：
M. Pelto;J. Kavanaugh;C. McNeil
抽象的。朱诺冰原研究计划观测到的柠檬溪冰川和塔库冰川的年度表面物质平衡记录是北美最长的连续冰川年度物质平衡数据集。塔库冰川的年表面质量平衡（Ba）在1946-1985年期间平均为+0.40 m a−1，在1986-2011年期间平均为-0.08 m a−1。最近每年的质量平衡下降导致冰川的长期增厚停止。柠檬溪冰川的平均Ba从1953-1985年的-0.30 m a−1下降到1986-2011年的-0.60 m a−1。年表面物质平衡的累积变化为-26.6米水当量，即55年内冰变薄29米。雪坑测量跨越积累区，并探测断面以上的塔库冰川的瞬时雪线（TSL），表明一致的表面质量平衡梯度，从一年到一年。对柠檬溪冰川和塔库冰川的TSL上升速率的观测表明，相对一致的迁移速率为3.8至4.1 m d−1。柠檬溪冰川和塔库冰川的TSL与其他朱诺冰原冰川（诺里斯、门登霍尔、赫伯特和伊格尔）之间的关系很强，在所有情况下相关性都超过0.82。doi：10.5065/D6NZ85N3
Abstract. The annual surface mass balance records of the Lemon Creek Glacier and Taku Glacier observed by the Juneau Icefield Research Program are the longest continuous glacier annual mass balance data sets in North America. Annual surface mass balance (Ba) measured on Taku Glacier averaged +0.40 m a−1 from 1946–1985, and −0.08 m a−1 from 1986–2011. The recent annual mass balance decline has resulted in the cessation of the long-term thickening of the glacier. Mean Ba on Lemon Creek Glacier has declined from −0.30 m a−1 for the 1953–1985 period to −0.60 m a−1 during the 1986–2011 period. The cumulative change in annual surface mass balance is −26.6 m water equivalent, a 29 m of ice thinning over the 55 yr. Snow-pit measurements spanning the accumulation zone, and probing transects above the transient snow line (TSL) on Taku Glacier, indicate a consistent surface mass balance gradient from year to year. Observations of the rate of TSL rise on Lemon Creek Glacier and Taku Glacier indicate a comparatively consistent migration rate of 3.8 to 4.1 m d−1. The relationship between TSL on Lemon Creek Glacier and Taku Glacier to other Juneau Icefield glaciers (Norris, Mendenhall, Herbert, and Eagle) is strong, with correlations exceeding 0.82 in all cases. doi:10.5065/D6NZ85N3