Highlights Panteleev’s filtering method is applied to the regional contribution to atmospheric angular momentum (AAM). The evolution of the regional atmospheric influence on Chandler wobble is investigated. Quasi 20-year period of evolution is found in the atmospheric Chandler excitation in the Northern and Southern hemispheres. The integrated AAM is compared with the geodetic excitation.

    Abstract From the maps of regional contribution to atmospheric angular momentum (AAM) over the period 1948–2011 (NCEP/NCAR reanalysis data) time domain excitation in Chandler frequency band was extracted by Panteleev’s filtering method. This permits us to investigate the evolution of the regional atmospheric influence on Chandler wobble. It appears that the temperate latitudes bring the strongest inputs. For pressure term they are limited to continents, and highlight the role of Europe. For the wind term they mostly result from ocean area, encompassing in particular North Atlantic. A quasi-20year cycle is found in the regional patterns of the atmospheric excitation. The integrated AAM is finally compared with the geodetic excitation reconstructed from the observed polar motion.


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    Title :

    Regional atmospheric influence on the Chandler wobble


    Contributors:
    Zotov, L.V. (author) / Bizouard, C. (author)

    Published in:

    Advances in Space Research ; 55 , 5 ; 1300-1306


    Publication date :

    2014-12-09


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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