North Tropical Atlantic Index and NINO3 Index

On this plot are time series of the three-month running average of the standardized North Tropical Atlantic Index (NATL) (dotted line; monthly mean sea surface temperature anomalies averaged over the region 10°N to 20°N latitude and 79°W to 20°W longitude), the three-month running average of the standardized NINO3 index (dashed line; monthly mean SST anomalies averaged over the region 5°S to 5°N latitude, 150°W to 90°W longitude), and the standardized difference between NATL and NINO3 (solid red line; NATL minus NINO3).

The climatological base period for the sea surface temperature anomalies is 1991-2020, and the anomalies are standardized with respect to the period December 1981 to present.

Dataset Documentation

Monthly SST Data

Data

NOAAs 1/4-degree Daily Optimum Interpolation Sea Surface Temperature (OISST) Version 2.1 monthly sea surface temperature anomaly (in °C) with respect to the 1991-2020 base period on a 0.25° lat/lon grid

Data Source

NOAA National Centers for Environmental Information (NCEI) (OISST Version 2.1 Data Library entry)

Analysis

Three-month running average of standardized monthly sea surface temperature anomalies averaged over the region 10°N to 20°N latitude and 79°W to 20°W longitude (NATL), the three-month running average of standardized monthly sea surface temperature anomalies averaged over the region 5°S to 5°N latitude and 150°W to 90°W longitude (NINO3), and the standardized difference between NATL and NINO3.

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