Niño 3.4 (5N-5S, 170W-120W): The Niño 3.4 anomalies may be thought of as representing the average equatorial SSTs across the Pacific from about the dateline to the South American coast.

SST anomalies averaged over the NINO34 region 5°North-5°South;170-120°West. Total SSTs also available for this region. Correlates well with teleconnections to North America. Calculated from the Monthly NOAA ERSST V5 (at NOAA/CPC). SST anomalies averaged over the NINO3 region 5°North-5°South;150°West-90°West.

El Niño (La Niña) is a phenomenon in the equatorial Pacific Ocean characterized by a five consecutive 3-month running mean of sea surface temperature (SST) anomalies in the Niño 3.4 region that is above (below) the threshold of +0.5°C (-0.5°C). This standard of measure is known as the Oceanic Niño Index (ONI).

Correlation of January Ni˜o 3.4 timeseries with NCEP SST. Select this link to get a plot. Plot is taken from the Timesseries Plotting and Analysis webpage. SST area averaged 5N-5S;170W-120W. Dataset is the NOAA ERSST V5. Map of region. Niño 3.4 Index: (Anomaly) Standard PSL Format (What is standard format?)

2009年8月30日 · NOAA considers El Niño conditions to be present in the ocean when the ONI in that area, known as the Niño-3.4 region, is +0.5 or higher, meaning surface waters in the east-central tropical Pacific are 0.5 degrees Celsius (0.9 degrees Fahrenheit) or …

The monthly 30-year climatological values are updated every five years and are used to calculate the anomalies, which in turn are used to calculate the Oceanic Niño Index (ONI). The updating of the base periods is done to remove the observed warming trend in the Niño 3.4 region (see Climate Watch article). Since El Niño and La Niña are ...

The ONI is based on SST departures from average in the Niño 3.4 region, and is a principal measure for monitoring, assessing, and predicting ENSO. Defined as the three-month running-mean SST departures in the Niño 3.4 region. Departures are based on a set of improved homogeneous historical SST analyses (Extended Reconstructed SST –ERSST.v5 ...

Niño 3.4 is the area averaged anomalies over the Niño 3.4 region (5N-5S)(170-120W) using a climatology of 1981-2010. Map of ENSO regions. Temporal Coverage. Monthly values: 1870/01 to present; Update Status: Monthly; Data Notes. Units: ℃

2019年2月28日 · The Nino 3.4 Index region SST with extents (5N-5S, 120W-170W) is the box region highlighted over the Pacific Ocean. Highlighted in the timeline are the strong El Niño years, in which Sea Surface Temperature (SST) anomalies peaked: 1982 …

1 天前 · How sea surface temperatures in the Niño-3.4 region of the tropical Pacific changed over the course of all La Niña events since 1950 (gray lines) and 2024-25 (black line). This shows the traditional calculation for Niño-3.4, the monthly temperature compared to the most recent 30-year average (1991–2020 for the 2024 line).