Revised estimation of continental water and ice mass loss pertinent to sea level change

GRACE;Degree-1;C21;S21;Sea level;Mass budget;507

사범대학 과학교육과 ;

University:서울대학교 대학원

关键词: GRACE;    Degree-1;    C21;    S21;    Sea level;    Mass budget;    507;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/141950/1/000000150425.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

Low degree spherical harmonics coefficients of Gravity Recovery and Climate Experiment (GRACE) gravity solutions contain large uncertainty due to its measurement limitation. In addition, residual PGR effect after its correction via numerical models remains in the GRACE gravity data and thus cause additional uncertainty in the estimate of regional and larger scale surface mass change. These inaccurate low degree coefficients in GRACE gravity data must be carefully considered when estimating water mass variations in regional scale. In this study, degree-1 and C21 and S21 coefficients in the association with surface mass distribution were estimated by the forward modeling incorporating self-attraction and loading effect to realize ocean mass changes. The PGR model error was mostly suppressed in the new estimates of degree-1 and C21 and S21 SH coefficients. Using the low degree SH coefficients, we re-evaluated ocean and continental mass variations. In particularly, we showed that terrestrial water mass depletion in Asia and North America is a significant contributor to the contemporary sea level rise.