摘要
海洋角动量变化与洋流、海水质量分布变化密切相关。基于美国马里兰大学SODA海洋同化资料 ,研究了 1985～ 2 0 0 1年期间全球赤道海洋角动量的变化。从数月到年际时间尺度 ,固体地球、大气、陆地水和海洋总角动量守恒。从固体地球角动量变化中扣除大气和陆地水角动量变化的影响 ,可以为海洋角动量的变化提供约束 ,用于检验所得全球海洋角动量变化的准确性。季节尺度上的分析比对显示 ,在赤道的格林尼治方向上 ,海洋角动量变化大于大气角动量变化 ,并与约束序列的变化具有高度一致性 ;在赤道东经 90°方向上 ,海洋角动量变化比大气角动量变化小一个数量级 ,并与 1985～
Monthly OAM variability during 1985-2001 is estimated from a simple ocean data assimilation (SODA) analysis. The SODA analysis is near the global, spanning the latitude range 62°S～62°N. On the basis of the principle of angular momentum conservation in the whole Earth system including the solid Earth, atmosphere, ocean, hydrology, etc., the residual between the solid Earth and geophysical fluids (atmosphere and hydrology) can be the constraint on OAM variability. And here the constraint are inferred from the Length-of-day change and polar wobble of the international earth rotation service (IERS), the atmospheric reanalysis of the national centers of environmental prediction (NCEP), and the hydrologic and 1\|10 hpa atmospheric processes of a climate model output of Japan meteorological agency (JMA). Results indicate that at seasonal scale, the equatorial OAM variability and the constraint along the Greenwich meridian direction from 1985 to 2001 agree with each other significantly.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2003年第6期697-702,共6页
Geomatics and Information Science of Wuhan University
基金
中国科学院知识创新工程资助项目 (KZCX3 SW 13 2 )
地球空间环境与大地测量教育部重点实验室开放研究基金
国家自然科学基金资助项目 ( 4 0 2 3 10 0 4)
关键词
海洋角动量
大地测量
约束
地球自转
ocean angular momentum (OAM)
earth rotation
constraint
