Image

IOD ..Indian Ocean dipole


thanks to ‘coldfront’ for this link
http://forum.weatherzone.com.au/ubbthreads.php/topics/1286233/Re_ENSO_Discussion_2014#Post1286233


source
http://www.bom.gov.au/climate/enso/indices.shtml

Advertisement
Image

GLOBAL SEA SURFACE TEMPERATURE ANOMALY 2019_2016-2015-2014-2013-

CLICK ON TITLE TO LOAD ALL ENTRIES BELOW..
I COLLECT SNAPS OF THE GLOBAL SEA TEMPERATURE ANOMALIES OVER TIME

http://weather.unisys.com/surface/sfc_daily.php?plot=ssn&inv=0&t=cur

22nd July 2014

22nd july sst anomlay

JULY 7th 2014

july 2014 global sst

MAY 21st 2014

may 2014 global SST anomaly

APRIL 2014

april 2014 sst global anomaly UNIYSS

22nd FEB 2014

global sst feb 2nd 2014

1st DECEMBER 2013

dec 2013 sst global

2nd NOVEMBER 2013

nov2nd 2013 globsal ocean sst

5th OCTOBER 2013

oct 2013 SST anomaly

AUGUST 2013

aug 2013

Image

SOI…. Southern Oscillation Index

PLEASE CLICK ON THE TITLE TO LOAD ALL FURTHER ENTRIES BELOW

Definition from BOM

http://www.bom.gov.au/climate/current/soihtm1.shtml

 

“The Southern Oscillation Index, or SOI, gives an indication of the development and intensity of El Niño or La Niña events in the Pacific Ocean. The SOI is calculated using the pressure differences between Tahiti and Darwin.

Sustained negative values of the SOI lower than −7 often indicate El Niño episodes. These negative values are usually accompanied by sustained warming of the central and eastern tropical Pacific Ocean, a decrease in the strength of the Pacific Trade Winds, and a reduction in winter and spring rainfall over much of eastern Australia and the Top End.

Sustainted positive values of the SOI greater than +7 are typical of a La Niña episode. They are associated with stronger Pacific trade winds and warmer sea temperatures to the north of Australia. Waters in the central and eastern tropical Pacific Ocean become cooler during this time. Together these give an increased probability that eastern and northern Australia will be wetter than normal.

Technical details

There are a few different methods for calculating the SOI. The method used by the Australian Bureau of Meteorology is the Troup SOI which is the standardised anomaly of the Mean Sea Level Pressure difference between Tahiti and Darwin.”

 

CURRENT SOI.. 30 day moving average

current SOI

source
http://www.bom.gov.au/climate/enso/

Long term time series

http://www.bom.gov.au/climate/influences/timeline/

soi 1876 fom1896soi 1896 to 1916soi 1918 to 1938soi 1940 to 1960soi 1962 to 1982soi 1984 to 2004soi 2004 to 2018