CAJ | 학술논문

本文利用卫星重力、卫星测高和海洋温盐数据反演计算全球海水质量变化,并分析其时空变化特征.卫星重力数据利用2003年1月～2006年12月的GRACE月时变重力场球谐系数,同时考虑替换一阶项和C_(20)项,并进行了相关误差滤波、高斯滤波和陆地水文信号泄漏改正,计算得到海洋等效水高变化;利用相同时间跨度的卫星测高数据和海洋温度、盐度水文观测数据,计算全球海平面变化和比容海平面变化,反演得到海水质量变化.反演的两种海水质量变化的年际变化特征一致性较好.三种数据得到的长期趋势变化,与1993～2003年的结果相比,可以看出,海水质量变化加速,并已成为全球海平面上升的主要因素.
본문이용위성중력、위성측고화해양온염수거반연계산전구해수질량변화,병분석기시공변화특정.위성중력수거이용2003년1월～2006년12월적GRACE월시변중력장구해계수,동시고필체환일계항화C_(20)항,병진행료상관오차려파、고사려파화륙지수문신호설루개정,계산득도해양등효수고변화;이용상동시간과도적위성측고수거화해양온도、염도수문관측수거,계산전구해평면변화화비용해평면변화,반연득도해수질량변화.반연적량충해수질량변화적년제변화특정일치성교호.삼충수거득도적장기추세변화,여1993～2003년적결과상비,가이간출,해수질량변화가속,병이성위전구해평면상승적주요인소.
Global ocean mass variations in recent four years are computed by use of the data of satellite gravity, satellite altimetry and marine hydrology, and their spatial and temporal characteristics are also analyzed. Monthly GRACE gravity field models during the four years from January 2003 to December 2006 are selected from UTCSR (University of Texas Center for Space Research), in which the spherical harmonic coefficients of the degree 1 and C_(20) are considered to be substituted. In the data processing, a new filter to remove correlative errors and Gaussian filter are applied, and the leakages of land hydrological signal are corrected to obtain the mass variation component of the sea level change expressed in equivalent water height. The global sea level changes are computed using Jason-1 data in the same duration, and the steric variations are obtained by inversion using monthly ocean temperature and salinity data, so that the mass variations of sea water are determined. The two type maps of the inversed mass variations agree well with each other in the characteristics of yearly variation. Compared to the long-term trends derived from altimetry, GRACE and ocean data observed during 1993 and 2003, we can see that the contribution of global ocean mass variations get larger, and becomes the main factor affecting the global mean sea level rise.