项目名称: 高纬度海域高度计资料订正及基于高度计资料的全球潮汐模型研究
项目编号: No.41306194
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 天文学、地球科学
项目作者: 程永存
作者单位: 南京信息工程大学
项目金额: 26万元
中文摘要: 针对目前高度计海平面高度异常数据(SLA)在高纬度海域覆盖范围和可用率低的情况,项目将首次重新订正高纬度ERS-1/2/Envisat卫星高度计数据。基于响应分析法和FES2004模型,使用订正后的沿轨卫星高度计资料和ICESat卫星资料,提取SLA时间序列中的潮汐信息,提高全球潮汐模型在高纬度海域的精度。为降低高纬度海域年周期信号对潮汐响应分析的影响,首先使用DTU10年周期信号模型去除SLA中的年周期信号,再进行响应分析。在浅水海域,项目拟首次同时将6年TOPEX/Jason-1卫星高度计phase B数据和TOPEX/Jason-1/2 phase A数据用于潮汐信息响应分析,进而提高全球潮汐模型在浅水海域的精度。重新订正的太阳同步轨道卫星高度计数据产品可以为后续极地/全球海平面变化研究奠定基础;新发展全球潮汐经验模型可用于GRACE数据和我国HY-2卫星高度计数据产品业务化处理。
中文关键词: 高度计;潮汐模型;海平面异常;;
英文摘要: Considering the low altimetry data coverage and availability, the ERS-1/2 and Envisat satellite altimetry sea level anomaly data (SLA) is reprocessed in high latitudes firstly. Based on an empirical correction to the global tide model FES2004 (Finite Element Solutions), with residual tides estimated from reprocessed altimetry SLA time series and ICESat data using the response method, the global ocean tide model is improved in polar seas. Moreover, annual sea level variations are first removed using DTU10 annual signal model prior to estimate the residual tides to improve tidal determination of diurnal constituents from the sun-synchronous satellites and S2 residual tide from ICESat laser altimetric data. In shallow waters, the improvements in global ocean tide model is achieved by firstly introducing 6 years of TOPEX/Jason-1 interleaved mission (phase B) into existing primary TOPEX/Jason-1/2 missions (phase A) SLA time series. The re-processed sun-synchronous satellite data (ERS-1/2/Envisat) is basic to the following Polar Seas/globalsea level change studies. The proposed new golbal ocean tide model is significant to operational tidal correction applied to the GRACE data and China HY-2 satellite altimetry tidal correction.
英文关键词: altimetry;ocean tide model;sea level anomaly;;