利用卫星重力、卫星测高与温盐数据分析红海质量变化

Mass Variations in the Red Sea Inferred from Satellite Gravity,SatelliteAltimetry and Temperature and Salinity Data

利用卫星重力、卫星测高与温盐数据监测红海2003—2014年质量变化,结果表明,红海质量变化主要受季节性信号影响,周年信号显著且分布较为均匀,半周年信号较弱且易受数据误差影响。GSFCM与测高-比容估算的季节性信号基本一致,表明卫星重力数据能够有效监测红海质量变化。由于尺度因子偏小导致外泄漏改正不充分,JPL季节性信号偏小,表明尺度因子信号恢复方法不适用于红海地区。GSFCM与测高-比容估算的年际信号(4.8±2.0/4.3±2.0 mm/yr)符合较好,受GLDAS数据年际信号不准确导致内泄漏改正不充分的影响,JPL的年际信号(-2.6±3.4 mm/yr)明显偏小。

The satellite gravity,satellite altimetry,and temperature and salinity data are used to monitor the mass variations of the Red Sea from 2003 to 2014.The results show that the seasonal signal dominates the mass variations of the Red Sea.Annual signals are significant and uniformly distributed,and semi-annual signals are weak and susceptible to data errors.The seasonal signals of the mass variations of the Red Sea inferred from GSFCM and altimetry-steric demonstrate good consistency,implying that satellite gravity data can effectively monitor the mass variations of the Red Sea.The imperfect scale factor results in insufficient external leakage correction.The seasonal signal of JPL is smaller,indicating that scale factor is not applicable to the Red Sea.The long-term trend of the mass variations of the Red Sea inferred from GSFCM and the altimetry-steric(4.8±2.0/4.3±2.0 mm/yr)is in good agreement.The inaccuracy of the GLDAS data results in insufficient internal leakage correction,the long-term trend of JPL(-2.6±3.4 mm/yr)is significantly smaller.