期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 148, 期 -, 页码 85-96出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2014.07.002
关键词
tides; variability; cycles; runoff; inter-annual; climate; South America; Argentina-Uruguay; Rio de la Plata estuary
资金
- ANPCyT (National Agency for Scientific and Technological Research of Argentina) [PICT 2010-1831]
- CONICET (National Council for Scientific and Technological Research of Argentina) [PIP 112 201101 00176, UBACyT 2011-2014 20020100100840]
- CONICET
- UBA
We analyze the only long-term (47-years long) hourly tide-gauge record available for the Rio de la Plata estuary for variability in the amplitude and phase of the dominant principal lunar semi-diurnal (M-2) constituent. The tidal record was first filtered to isolate the signal at the frequency of M-2. Then harmonic analysis was applied to the filtered data for periods of one year with progressive lags of one month. This way, monthly time series of M-2 amplitude and phase were obtained, which were then analyzed by means of several spectral techniques. Both M-2 amplitude and phase present a long-term trend/inter-decadal cycles and significant pseudo-periodicities at frequencies which are known as typical of the El Nino - Southern Oscillation (ENSO) cycles. A joint multi-channel singular spectral analysis of the tidal constants and the runoff to the estuary (which variability is dominated by the ENSO cycles effect on precipitation over southern South America) reveals co-movements at periods around 2.5, 3.5 and 6.5 years, as well as long-term trends/inter-decadal cycles. Positive (negative) runoff anomalies are associated with negative (positive) amplitude anomalies and negative (positive) phase anomalies. The detected variability in the tidal constants seems to be the result of the interaction between the tidal wave propagating upstream and the downstream currents due to the runoff, rather than a result of the variability in the mean sea level caused by the runoff. (C) 2014 Elsevier Ltd. All rights reserved.
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