High-Resolution Marine Gravity, Seafloor Topography, and Seafloor Roughness

高分辨率海洋重力、海底地形和海底粗糙度

基本信息

批准号：
0326707
负责人：
David Sandwell
金额：
$ 36.76万
依托单位：
University of California-San Diego Scripps Inst of Oceanography
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2003
资助国家：
美国
起止时间：
2003-07-15 至 2008-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0326707&HistoricalAwards=false
关键词：
Resolution Marine Gravity Seafloor Topography

项目摘要

The PIs will improve the precision and resolution of marine gravity and topography by re-tracking the waveforms of the ERS-1 and Geosat altimeters to better image local gravity anomalies for: 1) resolving the fine-scale tectonic structure of the deep ocean floor (e.g., abyssal hills, microplates, propagating rifts, seamounts, meteorite impacts, . . .); 2) measuring the roughness spectra of the seafloor on a global basis to better constrain models of tidal dissipation, vertical mixing, and mesoscale circulation of the oceans; and 3) resolving the fine-scale gravity field of the continental margins for basic research and petroleum exploration. The work funded here will make a factor of 2 improvement in the global gravity models. The improvement will be more significant in near-shore areas where Geosat data are missing. Funded tasks include: a. re-track the waveforms of ERS-1 altimeter to reduce the noise by a factor of 2; b. re-track the waveforms of the Geosat altimeter to reduce the noise by 20%; c. combine altimeter data from Geosat, ERS, GFO, Topex, and Jason-I to develop new marine gravity models using long-wavelength fields ( ~400 km) from CHAMP and GRACE as constraints; d. construct a new global topography model based on the best available gravity and topography data; e. perform scientific investigations of small-scale tectonics, seafloor roughness, and isostasy.

PI 将通过重新跟踪 ERS-1 和 Geosat 高度计的波形来提高海洋重力和地形的精度和分辨率，以更好地对局部重力异常进行成像，从而：1）解析深海海底的精细尺度构造结构（例如，深海丘陵、微板块、传播裂痕、海山、陨石撞击。）； 2）测量全球海底粗糙度谱，以更好地约束海洋潮汐消散、垂直混合和中尺度环流模型； 3）解析大陆边缘细尺度重力场，用于基础研究和石油勘探。这里资助的工作将使全球重力模型提高两倍。在缺少地理卫星数据的近岸地区，这种改善将更为显着。资助的任务包括：重新跟踪ERS-1高度计的波形，将噪声降低2倍； b.重新跟踪Geosat高度计波形，噪音降低20%； c.结合来自 Geosat、ERS、GFO、Topex 和 Jason-I 的高度计数据，使用 CHAMP 和 GRACE 的长波长场（~400 km）作为约束来开发新的海洋重力模型； d.根据现有的最佳重力和地形数据构建新的全球地形模型； e.对小规模构造、海底粗糙度和均衡性进行科学研究。