![]() Outgoing Longwave Radiation (OLR) area averages over the central equatorial Pacific (160☎-160°W). It is based on EOF's calculated from monthly anomalies of 500mb height from the NCEP Reanalysis. The PNA is one of the most prominent modes of extratropical variability in the northern Hemisphere. ![]() Calculated from the NOAA ERAATV5, COBE SST, and HadISST1.1 (PSL/ESRL/NOAA). Pacific Decadal Oscillation: leading principal component of monthly SST anomalies in the North Pacific Ocean, poleward of 20N (global SST mean removed). Calculated from the Monthly HadISST1.1 dataset. It represents the gradient of the SST in the ENSO region of the tropical Pacific. Trans- Niño Index: Standardized Niño 1+2 minus the Niño 4 with a 5 month running mean applied (restandardized). The sign is opposite that of the Nino indices and it is noisier than those indices. It represents the atmospheric component of the ENSO. ![]() Southern Oscillation Index: Difference between standardized Darwin and standardized Tahiti surface pressure values. Oceanic Niño Index: 3 month running mean of ERSST.v4 SST anomalies in the Niño 3.4 region (5°N-5°S, 120°-170°W) Calculated from the ERSST V5 (at NOAA/CPC).īivariate El Nino- Southern Oscillation Index: The Niño 3.4 SST and SOI are normalized and combined. Calculated from the Monthly ERSST V5 (at NOAA/CPC). Total SSTs also available for this region. SST anomalies averaged over the NINO1 and NINO2 regions 0-10°South 90°West-80°West (eastern most of the Niña indices). 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. Correlates well with teleconnections to North America. SST anomalies averaged over the NINO34 region 5°North-5°South 170-120°West. SST anomalies averaged over the NINO4 region 5°North-5°South 160☎ast-150°West (western most of Niño indices). It is calculated using the JRA55 reanalysis dataset and the NCEI OLR. seven events since 1948.Ī multi-variate index of ENSO which uses SST, winds, SLP, and OLR. These plots show current 2018 values of various indices vs. There is also a La Niña Dashboard looking at the recent index values and comparing them to historic La Niña events and a Neutral Dashboard looking at the current year to neutral events. Selected using the MEI.ext and the ERSST V5 SST datasets as a guide. Second are time-series plots of various ENSO indices. There are fewer time series thatĬover from 1870 to present. (1948 onwards) index section and a longer (1870 onwards) one. First are plots of the progression of theĬurrent event is compared to historic El Niño events. Also see the web page to analyze and compare See the PSL news story on flavors ofĮNSO. The following indices all help characterize ENSO but at different The different patterns have implications for climate impacts both ENSO is a phenomenom which extends over large spatial area and can have a different seasonalĮvolution from event to event.
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