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.

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）在全球基础上测量海底的粗糙度光谱，以更好地限制海洋的潮汐耗散，垂直混合和中尺度循环的模型； 3）解决大陆边缘的细尺度重力场进行基础研究和石油勘探。这里资助的作品将在全球重力模型中提高2倍。在缺少Geosat数据的近岸地区，改进将更加重要。资助的任务包括：重新跟踪ERS-1高度计的波形以将噪声减少2倍； b。重新跟踪GEOSAT高度计的波形，以将噪声降低20％； c。结合Geosat，ERS，GFO，Topex和Jason-I的高度计数据，以使用冠军和GRACE的长波长字段（约400公里）作为约束来开发新的海洋重力模型； d。根据最佳可用的重力和地形数据构建一个新的全球地形模型； e。对小规模构造，海底粗糙度和等索方法进行科学研究。