Coordination Funds

协调基金

• 批准号: 417199493
• 负责人: Professor Dr.-Ing. Frank Flechtner
• 金额: --
• 依托单位: Institut für Geodäsie und Geoinformationstechnik
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/417199493?language=en
• 关键词: Coordination; Funds

Satellite gravimetry provides the only opportunity to quantify mass redistribution in the Earth system on a global scale. The 20 years of monthly GRACE and GRACE-FO gravity field models revealed groundbreaking insights into a wide range of various geodynamic processes and climate related science. For the very first time hydrologists can quantify large scale loss of ground water, glaciologists can determine the melting of the Greenland and Antarctica ice sheets and oceanographers are able to close the mass and heat budget of the ocean, just to name a few.Nevertheless, GRACE and GRACE-FO do not fulfill the science and user needs yet which have been summarized in 2014 by a multi-disciplinary expert panel established under the auspices of the International Union of Geodesy and Geophysics (IUGG). As a consequence, the geoscientific community is in need to continuously improve the accuracy, spatial and temporal resolution and long-term consistency of time-variable gravity field models and corresponding mass transport products.Therefore, Research Group has concurrently worked in phase one towards improving and better understanding of applied sensor data, background models and processing strategies. This resulted in already significantly improved gravity field models for three test years.The new works in phase two will connect here. NEROGRAV is again structured along six Individual Projects which have been designed to efficiently reach four specific objectives of the Research Group. Three of them are unchanged the improvement and error quantification of geophysical background models, the improvement of spatio-temporal parameterization, and the validation against independent data. Here, the results of phase one are applied to the entire time series and questions arising from previous work will be answered. The fourth objective includes recommendations for planning of future gravity field missions and has been expanded to include geophysical applications of mass transport time series.NEROGRAV bundled the specific expertise of key research groups from Germany in the field of satellite gravimetry at universities and non-university research institutions. All groups have a long-term heritage of expertise in geodetic data acquisition and modeling and will additionally contribute their unique complementary expertise from various neighboring disciplines such as oceanography, hydrology, solid Earth, geophysics and atmospheric and climate sciences. Therefore, it is expected that the second funding phase will not only create significantly improved GRACE/GRACE-FO gravity field models over two decades, but also enable geophysical applications based on this long-term series such as quantifying North Atlantic deep water transports as indicator for variations in the Atlantic Meridional Overturning Circulation (AMOC), assessment of hydrometeorological extreme events or identification of climatic signatures in variations of the terrestrial water storage.

卫星重力测量提供了在全球范围内量化地球系统质量再分配的唯一机会。20年来每月GRACE和GRACE-FO重力场模型揭示了对各种地球动力学过程和气候相关科学的开创性见解。这是第一次，水文学家可以量化地下水的大规模损失，冰川学家可以确定格陵兰岛和南极洲冰盖的融化，海洋学家能够关闭海洋的质量和热量预算，仅举几例。GRACE和GRACE-FO还不能满足科学和用户需求，这已经在2014年由多个国际大地测量学与地球物理学联合会（IUGG）主持下设立的学科专家小组。因此，地球科学界需要不断提高时变重力场模型和相应物质输运产品的准确性、空间和时间分辨率以及长期一致性，因此，研究小组在第一阶段同时致力于改进和更好地了解应用的传感器数据、背景模型和处理策略。这使得重力场模型在三年的测试中得到了显著的改进。第二阶段的新工作将在这里连接。NEROGRAV也是按照沿着六个独立项目构建的，这些项目旨在有效地实现研究小组的四个具体目标。其中地球物理背景模型的改进和误差量化、时空参数化方法的改进和独立数据的验证是三个不变的。在这里，第一阶段的结果适用于整个时间序列，并回答了以前工作中出现的问题。第四个目标包括对未来重力场飞行任务的规划提出建议，并已扩大到包括质量输运时间序列的地球物理应用，NEROGRAV汇集了德国各大学和非大学研究机构卫星重力测量领域主要研究小组的专门知识。所有小组都在大地测量数据采集和建模方面拥有长期的专业知识，并将从海洋学，水文学，固体地球，地球物理学以及大气和气候科学等各个相邻学科中贡献其独特的补充专业知识。因此，预计第二个资助阶段不仅将在20年内创建显着改进的GRACE/GRACE-FO重力场模型，而且还将实现基于这一长期系列的地球物理应用，例如量化北大西洋深水输送作为大西洋经向翻转环流（AMOC）变化的指标，评估水文气象极端事件或确定陆地水储存变化的气候特征。