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Surface ocean indices (value for week ending 02 Aug 2008)

Pacific	current value	series std	current value key »	monthly tendency key »
Niño1+2 far eastern equatorial SSTA map »	1.09 °C	±1.22 °C
Niño3 eastern equatorial SSTA map »	0.63 °C	±1.00 °C
Niño3.4 central equatorial SSTA map »	0.02 °C	±0.95 °C
Niño4 west-central equatorial SSTA map »	-0.32 °C	±0.95 °C
Atlantic
TNA north tropical SSTA map »	0.25 °C	±0.40 °C
TSA south tropical SSTA map »	0.48 °C	±0.37 °C
NAT north equatorial SSTA map »	0.33 °C	±0.44 °C
SAT south equatorial SSTA map »	0.68 °C	±0.48 °C
TASI north-south equatorial SST gradient map »	-0.34 °C	±0.62 °C
Indian
WTIO western equatorial SSTA map »	-0.18 °C	±0.36 °C
SETIO southeastern equatorial SSTA map »	-0.59 °C	±0.43 °C
DMI west-east equatorial SST gradient map »	0.41 °C	±0.52 °C
SWIO south western SSTA map »	-0.31 °C	±0.45 °C

see also the OOPC main page for an alternate presentation of the state of the tropical oceans.

Subsurface ocean index

	updated	current value	std	latest 1‑yr mean value key »	latest 1‑yr tendency key »
Bermuda-Labrador Basin Transport Index »	18 Jun 2008	59.4 Mtons/sec	±3.6 Mtons/sec
indicative of the strength of the Gulf Stream and North Atlantic Current. The standard deviation, latest one-year mean value and tendency are calculated based on the raw series over the years 2000-2005.

Atmospheric teleconnection indices

	updated	latest monthly value	series std	latest 3‑mo mean value key »	latest 3‑mo tendency key »	latest 1‑yr mean value key »	latest 1‑yr tendency key »
AO Arctic Oscillation	Jun 2008	-0.09	±1
NAO North Atlantic Oscillation	Jun 2008	-1.39	±1
PNA Pacific-North America Pattern	Jun 2008	-1.75	±1
PDO Pacific Decadal Oscillation	Jun 2008	-1.34	±1
SAM Southern Annular Mode	Jun 2008	1.35	±1
SOI Southern Oscillation Index	Jul 2008	0.30	±1.77
AMO Atlantic Multidecadal Oscillation	Jun 2008	0.31	±0.21

Key to symbols

value of the index (over the period indicated to latest value)

strongly positive (+1 std < x)
weakly positive (+0.3 std < x < +1 std)
neutral (-0.3 std < x < +0.3 std)
weakly negative (-1 std < x < -0.3 std)
strongly negative (x < -1 std)

x = value of the index over the period indicated to the latest value
std = series standard deviation over period of the climatology

tendency (rate of change over period indicated to latest value)

strong positive tendency (+1 stdx < dx)
weak positive tendency (+0.3 stdx < dx < +1 stdx)
no change (-0.3 stdx < dx < +0.3 stdx)
weak negative tendency (-1 stdx < dx < -0.3 stdx)
strong negative tendency (dx < -1 stdx)

dx = slope of linear fit to values over the period of time indicated, ending at latest value of the index
stdx = standard deviation of dx over the period of the climatology

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