ENSO goes to neutral

Discussion in 'Environment' started by ScienceRocks, Jun 13, 2011.

  1. ScienceRocks

    ScienceRocks Democrat all the way!

    Mar 16, 2010
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    Climate Prediction Center Weekly Update of 6/13/11

    Nino 3.4 is now up to 0.0C.

    Niño 4= -0.2ºC
    Niño 3.4= 0.0ºC
    Niño 3= 0.2ºC
    Niño1+2= 0.9ºC

    Synopsis: ENSO-neutral conditions have developed and are expected to continue at least through the Northern Hemisphere summer 2011.

    A transition from La Niña to ENSO-neutral conditions occurred during May 2011 as indicated by generally small sea surface temperature (SST) anomalies across the equatorial Pacific Ocean east of the Date Line (Fig. 1). The latest weekly Niño index values (Fig. 2) showed near-average SSTs in the central and east-central equatorial Pacific (Niño-4 index of –0.2oC and Niño 3.4 index of –0.1oC), and above-average SSTs in the eastern equatorial Pacific (Niño-1+2 index of +0.7oC). The subsurface oceanic heat content anomalies (average temperatures in the upper 300m of the ocean, Fig. 3) remained elevated, but relatively constant during the month, reflecting a large area of above-average temperatures at depth (Fig. 4). Consistent with other transitions to ENSO-neutral conditions, the atmospheric circulation anomalies continued to show some features consistent with La Niña, albeit at weaker strength. Convection was enhanced over eastern Indonesia and suppressed over the central equatorial Pacific (Fig. 5). Also, anomalous low-level easterly and upper-level westerly winds weakened but persisted over the central Pacific. Collectively, these oceanic and atmospheric anomalies reflect a transition to ENSO-neutral conditions, but with lingering La Niña-like atmospheric impacts, particularly in the global Tropics.

    Current observed trends, along with forecasts from a majority of the ENSO models, indicate ENSO-neutral will continue through the Northern Hemisphere summer 2011 (three-month average in the Niño-3.4 index between –0.5oC and +0.5oC; Fig. 6). Thereafter, most models and all multi-model forecasts (shown by the thick lines) predict ENSO-neutral to continue through the remainder of 2011. However, the status of ENSO beyond the Northern Hemisphere summer remains more uncertain due to lower model forecast skill at longer lead times, particularly during this time of year.

    We're just getting out of the most powerful nina since 1976 so it will take a good year of neutral conditions to move us all the way to what our temps would be in a neutral. But at least we're not cooling anymore. I expect 5-6 within giss, 6-7 noaa, 9-10 uah.
    Last edited: Jun 13, 2011

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