Mathematics – Logic
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acasn..46..452y&link_type=abstract
Acta Astronomica Sinica, vol. 46, no. 4, p.542-459
Mathematics
Logic
Earth Rotation, Relative Atmospheric Angular Momentum (Raam), Bp Method, Sp Method
Scientific paper
The atmospheric motion with respect to the solid Earth causes relative atmospheric angular momentum,(RAAM), which variation excite the Earth's rotation change at the multi-temporal scales. There are two methods to be applied to compute RAAM. One is the SP method, by which wind contribution on RAAM is integrated from Earth's surface to top pressure level. Another is the BP method, by which the integration is from 1000hPa to top pressure level. We compare the RAAM difference caused by the two methods in detail, and calculate the RAAM temporal variation and Spatial characteristics based on the meteorological reanalysis data coming from the European Center for Medium range Weather Forecast (ECMWF), and the National Centers for Environmental Prediction(NCEP). The results show that the obvious differences between the ECMWF and NCEP RAAM excitations on annual polar wobble are mainly located in the Asian monsoon area and the Antarctic region.
Yan Hao-Ming
Zhong Ming
Zhu Yao-Zhong
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