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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 2, pp. 44-52

A confirmation of the oceanic pole tide influence on El Niño

I.V. Serykh 1 , D.M. Sonechkin 1 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia

Accepted: 09.02.2016
DOI: 10.21046/2070-7401-2016-13-2-44-52 

A hypothetical mechanism is suggested how the North Pacific pole tide (excited by the well-know Chandler wobble in the Earth’s pole motion) is capable to excite El Niño. This tide propagates eastward within a temperate latitude belt. Its period is equal to about 14 months. The realism of this mechanism is tested on the basis of monthly mean satellite altimetry data (AVISO) over the period of 1993–2013. Reaching the North America coast, the tide transforms into a surf and the wave of this surf moves in the direction of the Panama Isthmus. Combined with simultaneous strengthening of the north-eastern trade winds that occurs during the autumn shift of the Intertropical Convergence Zone to the south, this surf wave excites the warm near-surface El Niño current. Further westward movement of the surf wave is traced in the AVISO sea level anomalies data up to the coasts of Indonesia Archipelago. It is found that some secondary waves alternately brake away from the surf wave and move north and south. These secondary waves are capable to affect the equatorial upwelling that is important for the El Niño – Southern Oscillation processes.
Keywords: sea level anomalies, the spread of the pole tide, Chandler wobble, El Niño - La Niña rhythm.
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