Accumulation over the Greenland ice sheet from historical and recent records
Accumulation over the Greenland ice sheet from historical and recent records
复制标题
历史和近期记录中格陵兰冰盖的积累
DOI：
10.1029/2001jd900153
复制
发表时间：
2001
影响因子：
--
通讯作者：
B. Csathó
中科院分区：
文献类型：
--
作者：
R. Bales;J. McConnell;E. Mosley‐Thompson;B. Csathó
水的积累，定义为降水量减去蒸发量，作为了解冰盖质量和海拔变化的计划的一部分，在整个格陵兰岛进行了估计。对格陵兰冰盖上360多个历史和最近的点积累估计进行了评价，并使用了276个被认为是高质量的估计来绘制积累图。该数据集包括作为过去5-15年四次调查的一部分开发的99个点;这些点被认为具有最高的准确性。使用克里金法，格陵兰上空的平均累积量估计为30 g cm−2 yr−1。对于海拔1800米以上的冰盖内部，大部分数据都是在那里获得的，平均累积量估计也为1.30 g cm−2 yr−1。冰盖上仍有许多地区，包括格陵兰岛的西北部、东南部和南部，其累积高度不确定，超过冰盖平均不确定性的20- 25%。在这些区域，将需要进一步取样，以减少区域和整个冰盖积累的不确定性。
Water accumulation, defined as precipitation minus evaporation, was estimated over all of Greenland as part of a program to understand changes in ice sheet mass and elevation. Over 360 historical and recent point accumulation estimates on the Greenland ice sheet were evaluated, and 276 estimates that were judged to be high quality were used to develop the accumulation map. The data set includes 99 points developed as part of four investigations of the past 5–15 years; these are judged to have the greatest accuracy. Using kriging, the average accumulation over Greenland is estimated to be ∼30 g cm−2 yr−1. For the interior part of the ice sheet above 1800 m elevation, where most of the data were acquired, the average accumulation is also estimated to be ∼30 g cm−2 yr−1. There are still many areas on the ice sheet, including northwest, southeast, and southern Greenland, where accumulation is highly uncertain, exceeding the mean ice sheet uncertainty at a point of ∼20–25%. In these regions, further sampling will be required to reduce uncertainty in both regional and ice-sheet-wide accumulation.