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4 paź 2002 · Abstract. [1] The asymmetric nature of El Niño and La Niña sea surface temperature (SST) anomalies is investigated by the use of National Centers for Environmental Prediction reanalysis data and various ocean and atmosphere models.
18 gru 2023 · Neutral phases are defined by sea surface temperature patterns corresponding to the long-term average, while El Niño and La Niña phases correspond to significant warm and cold anomalies, respectively.
1 wrz 2002 · It is demonstrated that the relatively weak SST anomalies during La Niña compared with those of El Niño are related to the westward shift of wind stress anomalies by 10°–15°.
20 mar 2024 · Key Points. El Niño-Southern Oscillation complexity underwent significant asymmetric changes around 1990, especially in spatial pattern and temporal evolution. El Niño's pattern shifted from Eastern Pacific to Central Pacific, while La Niña's timing transitioned from single-year to multi-year.
ENSO Alert System Status: La Niña Watch. ENSO-neutral conditions are present.*. Equatorial sea surface temperatures (SSTs) are near-to-below-average in the central and eastern Pacific Ocean. La Niña is favored to emerge in September-November (60% chance) and is expected to persist through January-March 2025.*.
These sea surface temperature and rainfall anomaly images show the direct correlation between ocean temperatures and rainfall during El Niño and La Niña events. For many people, El Niño and La Niña mean floods or drought, but the events are actually a warming or cooling of the eastern Pacific Ocean that impacts rainfall.
20 gru 2016 · For example, sea surface temperature (SST) anomalies (SSTAs) in the tropical Pacific associated with El Niño (warm) and La Niña (cold) years are asymmetric in terms of their meridional extent (Zhang et al. 2009), amplitude (Hoerling et al. 1997), and zonal phase propagation (McPhaden and Zhang 2009).
