Topographic Forcing of the Atmosphere and a Rapid Change in the Length of Day | Zendy

David A. Salstein | Zendy; Richard D. Rosen | Zendy

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Topographic Forcing of the Atmosphere and a Rapid Change in the Length of Day

Author(s) -

David A. Salstein,

Richard D. Rosen

Publication year - 1994

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.264.5157.407

Subject(s) - atmosphere (unit) , angular momentum , momentum transfer , earth's rotation , atmospheric sciences , forcing (mathematics) , perturbation (astronomy) , momentum (technical analysis) , tropics , environmental science , climatology , physics , geology , meteorology , geodesy , astronomy , classical mechanics , biology , ecology , finance , scattering , optics , economics

During June to September 1992, a special campaign was held to measure rapid changes in Earth's rotation rate and to relate these measurements to variations in the atmosphere's angular momentum, due principally to changes in zonal winds. A strong rise in both length of day and atmospheric momentum during a particular 6-day subperiod is documented, and this example of a short-period perturbation is identified with a specific regional coupling mechanism. Mountain torques within the southern tropics appear to account for most of the rapid momentum transfer between the solid Earth and atmosphere, with those across South America especially important.

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