The Greenland GPS Network (GNET): Geodetic characterization of water vapor, climate cycles, climate change and ice mass balance

该项目将使格陵兰全球定位系统网络(GNET)继续运行四年。GNET通过跟踪地球对不断变化的地表负荷的弹性反应，已被证明在“称重”格陵兰冰盖方面非常成功。PIS建议延长GNET的寿命，以便它能够继续感知冰块的时空变化，包括冰块损失中心位置的空间移动和质量变化率的加速。GNET现在正在解决地壳垂直位置的季节性振荡以及较长期的趋势。这些振荡反映了大气和冰盖对固体地球施加的负荷的季节性变化。大气压力信号将被移除，使用最先进的天气模型，以隔离由于冰盖变化而产生的信号。作为拟议的压力分析的一部分，它们还将为GNET中的每个站生成综合水汽的时间序列，从而有利于天气和气候预测。更广泛的影响包括对研究生的培训和对博士后研究员作为合作研究员的支持。从科学上讲，GNET正在解决一个引起极大兴趣、也具有相当社会重要性的问题：格陵兰物质平衡的轨迹和规模。随着目前和潜在的格陵兰卫星大地测量覆盖范围的进一步空白，GNET是我们观测冰冻圈的基石。这些数据是可公开获取的，并可通过联阿援助团近乎实时地获得。

This project would continue operation of the Greenland GPS Network (GNET) for four years. GNET has proven highly successful in "weighing" the Greenland ice sheet by tracking the earth's elastic response to changing surface loads. The PIs propose to extend the life of GNET so that it can continue to sense space-time changes in ice mass, including spatial shifts in the position of the centers of ice loss, and accelerations in mass change rates. GNET is now resolving seasonal oscillations in the vertical position of the earth's crust as well as longer-term trends. These oscillations reflect seasonal changes in the loads placed on the solid earth by both the atmosphere and the ice sheet. The atmospheric pressure signal will be removed, using state-of-the-art weather models, in order to isolate the signal due to changes in the ice sheet. As part of the proposed pressure analysis, they would also produce a time series of integrated water vapor for each station in GNET, with benefits for weather and climate predictions. Broader impacts include the training of a graduate student and support of a postdoctoral researcher as co-investigator. Scientifically, GNET is addressing a problem of great interest and also considerable societal importance: the trajectory and magnitude of Greenland mass balance. With current and potential additional gaps in satellite geodesy coverage of Greenland, GNET is a cornerstone of our observations of the cryosphere. The data are openly accessible and are available in near real-time through UNAVCO.