Global Glacier Mass Balance Synthesis

提出了冰川物质平衡数据的全球综合，其中将包括对测量的物质平衡数据进行评估和数字化。物质平衡数据集将包括三个数据库：一、所有测量的山地和亚极地冰川的年度比质量平衡；二、年积累(或冬季平衡)和年度消融(或夏季平衡)；三、冬季、夏季和年度质量平衡梯度，包括海拔高度。这些数据将通过几种方式进行分析：半球和全球个别冰川、山脉和国家的统计时空分析；年度波动分析和长期物质平衡趋势的确定；以及物质平衡梯度变化分析。主要工作包括：(1)整理和核对1945年以来测得的所有冰川的年度比质量平衡数据。(2)确定冰川变化对海平面的贡献，例如，不同冰川区域对海平面变化的贡献有多大？(3)估计不同地理位置冬季和夏季平衡(或年度积累和消融)的变化及其对年度物质平衡的影响。(4)确定不同山区物质平衡变化的主要原因。(5)分析物质平衡梯度(活动指数)及其与气候变化的关系。这项研究的最终成果将包括将在研训所以社区可获得的形式编制的三套物质平衡数据集，以及将由科罗拉多大学博尔德分校世界数据中心冰川学出版的数据报告“山脉和亚极冰川的物质平衡：数据和合成”。

A global synthesis of glacier mass balance data is proposed, which will include an evaluation and digitization of measured mass balance data . The mass balance data set will include three databases: I. annual specific mass balances of all measured mountain and subpolar glaciers; II. annual accumulation (or winter balance) and annual ablation (or summer balance); III. winter, summer and annual mass balance gradients will altitude. These data will be analyzed in several ways: statistical spatio-temporal analyses of individual glaciers, mountain ranges and countries, both hemispheric and global; analyses of annual fluctuations and determination of long-term mass-balance trends; and analyses of mass balance gradient changes. The main tasks include: (1) Assemble and check the annual specific mass balance data of all measured glaciers since 1945. (2) Determine the contribution of glacier changes to sea level, e.g., how much do different glacier regions contribute to sea-level change? (3) Estimate the variability of winter and summer balances (or annual accumulation and ablation) and their impact on annual mass balances in different geographical locations. (4) Determine the main causes for mass balance changes in different mountain regions. (5) Analyze mass balance gradients (activity indices) and their changes in connection with climate change. The end products of this research will include three mass balance data sets which will be produced at INSTAAR in a form accessible by the community, and the data report, "Mass balance of mountain and subpolar glaciers: data and syntheses" which will be published by World Data Center A Glaciology, University of Colorado, Boulder.