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Titolo:
DETECTION OF AN ENSO SIGNAL IN SEASONAL LENGTH-OF-DAY VARIATIONS
Autore:
GROSS RS; MARCUS SL; EUBANKS TM; DICKEY JO; KEPPENNE CL;
Indirizzi:
CALTECH,JET PROP LAB,4800 OAK GROVE DR,MAIL STOP 238-332 PASADENA CA 91109 USN OBSERV WASHINGTON DC 20392
Titolo Testata:
Geophysical research letters
fascicolo: 23, volume: 23, anno: 1996,
pagine: 3373 - 3376
SICI:
0094-8276(1996)23:23<3373:DOAESI>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
AXIAL ANGULAR-MOMENTUM; NINO SOUTHERN-OSCILLATION; OCEAN-ATMOSPHERE MODEL; EL-NINO; EARTHS ROTATION; SPACE GEODESY; CYCLE; BUDGET; CHAOS; FLUCTUATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
R.S. Gross et al., "DETECTION OF AN ENSO SIGNAL IN SEASONAL LENGTH-OF-DAY VARIATIONS", Geophysical research letters, 23(23), 1996, pp. 3373-3376

Abstract

Conservation of angular momentum dictates that as the wind-driven axial atmospheric angular momentum changes, so will the length-of-day (LOD). In particular, as the strength of the seasonal zonal winds change,so should the strength of the seasonal LOD signals. Here, observed changes in the strengths of the annual and semiannual LOD signals during1963-1991 are analyzed and shown to be both significantly correlated (at the 99% significance level) with the Southern Oscillation Index (SOI), and to exhibit trends of comparable magnitude but opposite signs. This reported correlation between the SOI and changes in the amplitude of the seasonal LOD signals demonstrates a linkage between seasonal LOD (and hence seasonal zonal wind) variability and the El Nino / Southern Oscillation (ENSO) phenomenon. Furthermore, this study suggests that observed variations in the amplitudes of the seasonal LOD signals can be used to study changes in the strengths of the seasonal atmospheric zonal winds on interannual to decadal and longer time scales.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 07:55:28