THE EARTHS ANGULAR-MOMENTUM BUDGET ON SUBSEASONAL TIME SCALES

被引：45

作者：

DICKEY, JO ^{[1
]}

MARCUS, SL ^{[1
]}

STEPPE, JA ^{[1
]}

HIDE, R ^{[1
]}

机构：

[1] UNIV OXFORD,CLARENDON LAB,ROBERT HOOKE INST,OXFORD,ENGLAND

来源：

SCIENCE | 1992年 / 255卷 / 5042期

关键词：

D O I：

10.1126/science.255.5042.321

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Irregular length of day (LOD) fluctuations on time scales of less than a few years are largely produced by atmospheric torques on the underlying planet. Significant coherence is found between the respective time series of LOD and atmospheric angular momentum (AAM) determinations at periods down to 8 days, with lack of coherence at shorter periods caused by the declining signal-to-measurement noise ratios of both data types. Refinements to the currently accepted model of tidal Earth rotation variations are required, incorporating in particular the nonequilibrium effect of the oceans. The remaining discrepancies between LOD and AAM in the 100- to 10-day period range may be due to either a common error in the AAM data sets from different meteorological centers, or another component of the angular momentum budget.

引用

页码：321 / 325

页数：5