el niño current

In the decaying stage, positive SSH anomalies occur at 0°–10°N, consistent with the anomalous anticyclonic circulation (Figs. Albeit with detailed differences, the 13-month low-passed V anomalies at the mooring location of HYCOM (Fig. This brings us back to our original question: How will this affect ocean voyagers? Prevailing westerly winds and Ekman upwelling in the developing stage cause cyclonic anomalous circulation in the northwest tropical Pacific that strengthens the MC, and the opposite surface wind forcing effect in the decaying stage weakens the MC. Zonal velocity of TAO/TRITON was available at https://www.pmel.noaa.gov/gtmba/pmel-theme/pacific-ocean-tao. The other two experiments (EXP1 and EXP2) are used to understand the causes of interannual variability. The Niño-3.4 leads the MUC by 3 months with a maximum correlation coefficient of 0.54, suggesting that the MUC tends to become stronger in the decaying stage (Fig. Prevailing equatorial westerly winds and off-equatorial Ekman upwelling in the developing stage cause cyclonic circulation in the northwest Pacific, which strengthens the MC. As shown in Fig. SODA3.3.1 data have improved 0.25° × 0.25° horizontal and 50-level vertical resolutions (Carton et al. The phenomenon has been present for centuries, but received its name in the late 19th century because it was noticed that along the northern portion of the west coast of South America sea surface temperatures turned noticeably warmer periodically and that when this warming occurred, it tended to occur late in the year.

8 suggest that prior to a positive anomaly of the MC (weakening), there are easterly surface winds (negative) and Ekman downwelling (negative) in the western tropical Pacific that are likely the cause for the weakened MC.

5b). (2016) (Fig.

2005, 2009, 2011). The mooring observations overall suggest that year-to-year variations of the MC are likely quite different in both magnitude and timing from those of the MUC. First, though, it’s worth running through a very basic review of what El Nino is. Easterly winds and Ekman downwelling emerge during the decaying stage, which damp the existing cyclonic circulation and generate anticyclonic circulation, causing the weakening of the MC. 2 shows the V time series averaged over the MC and MUC layers at the mooring site from HYCOM CTL, SODA3.3.1, and OFES. The Niño-3.4 index and the MC show a maximum correlation of −0.51 (negative correlation indicates southward velocity anomaly occurring with positive Niño-3.4) when the MC leads by 4 months (Fig. Regression of surface wind fields onto the 0–400-m V anomaly: (a)–(f) EPV anomalies (color shading; m s−1) and zonal wind anomalies (gray contours; m s−1) leading the 0–400-m V anomaly by 10, 8, 6, 4, 2, and 0 months, respectively. As shown in Figs. Dynamic structure, Preliminary study on the formation mechanism of counter western boundary undercurrents below the thermocline—A conceptual model, On the subsurface countercurrents in the Philippine Sea, Semiannually alternating exchange of intermediate waters east of the Philippines, Seasonal variability of the Mindanao Current determined using mooring observations from 2010 to 2014, Intraseasonal variability of the surface zonal currents in the western tropical Pacific Ocean: Characteristics and mechanisms, Intraseasonal variability of the subthermocline current east of Mindanao, The mean structure and variability of the Mindanao Current at 8°N, ICOADS release 2.5: Extensions and enhancements to the surface marine meteorological archive, The thermohaline circulation in relation to the general circulation in the oceans, El Niño—The dynamic response of the equatorial Pacific Ocean to atmospheric forcing, The response of sea surface topography to the 1976 El Niño, Water displacements in the Pacific and the genesis of El Niño cycles, Indian Ocean capacitor effect on Indo-Western Pacific climate during the summer following El Nino, Impact of the Indian Ocean SST basin mode on the Asian summer monsoon, Mindanao Current/Undercurrent measured by a subsurface mooring, Spatial–temporal patterns and driving mechanisms of semiannual variations in the Philippine Sea, Dynamical responses of the west Pacific North Equatorial Countercurrent (NECC) system to El Niño events, For information regarding reuse of this content and general copyright information, consult the, This site uses cookies. (2018).

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