We study the effects of present‐day glacial discharges and the growth of the Antarctic ice sheet on exciting the Earth' rotational axis. Glacial forcing could cause a maximum change in J2 of about one‐third of the observed amount, for the Maxwell rheology and for Burgers’ body models with a long‐term, lower‐mantle viscosity greater than about 1023P. For transient rheologies the amount of excitation due to glacial melting decreases. Polar wander is not much excited by recent glacial melting for the various types of rheologies examined. Copyright 1986 by the American Geophysical Union.
Excitation of the Earth's rotational axis by recent glacial discharges / Gasperini P.; Sabadini R.; Yuen D.A.. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - STAMPA. - 13:6(1986), pp. 533-536. [10.1029/GL013i006p00533]
Excitation of the Earth's rotational axis by recent glacial discharges
Gasperini P.
Primo
Membro del Collaboration Group
;Sabadini R.Secondo
Membro del Collaboration Group
;
1986
Abstract
We study the effects of present‐day glacial discharges and the growth of the Antarctic ice sheet on exciting the Earth' rotational axis. Glacial forcing could cause a maximum change in J2 of about one‐third of the observed amount, for the Maxwell rheology and for Burgers’ body models with a long‐term, lower‐mantle viscosity greater than about 1023P. For transient rheologies the amount of excitation due to glacial melting decreases. Polar wander is not much excited by recent glacial melting for the various types of rheologies examined. Copyright 1986 by the American Geophysical Union.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
