摘要
分析计算了由陆地上土壤湿度和积雪水当量变化引起的水文变化对钱德勒摆动的激发作用,并将其和大气、海洋激发一起与天文观测激发作了比较.结果表明,虽然水文激发在钱德勒频带上的激发能量很小,只能解释观测激发的平均能量约10%,但是在大气激发的基础上增加水文变化的激发作用,显著提高了与观测激发的相干系数和置信度水平.因此,水文变化对钱德勒摆动的激发作用是值得重视的激发因素之一.
It is to compute hydrological excitation of Chandler wobble due to variation of soil moisture and water which is equivalent snow depth over land and to compare the result, together with atmospheric and to oceanic excitations, with astronomical observations. The result shows that the average energy of hydrological excitation in Chandler wobble frequency band is relatively smaller and can explain only about 10% of observed excitation. However, the combination of hydrological excitation with atmospheric excitation can evidently increase the squared coherence between observed excitation and combined excitation, and raise the confident threshold of the coherence analysis. Therefore, the continental water storage change is also an important contributor to Chandler wobble excitation.
出处
《天文学报》
CSCD
北大核心
2004年第1期48-56,共9页
Acta Astronomica Sinica
基金
国家自然科学基金重点项目(10133010)
自然科学基金项目(10273018)资助
