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Old November 3rd 03, 07:06 PM posted to uk.sci.weather
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Default SST Anomaly

Can somebody please explain exactly what is being shown he

http://tinyurl.com/rekh

I assume it shows the difference between the "current" sea surface temperatures and "normal" sea
surface temperatures.

My questions is, how do they define "normal" ?

I noticed just yesterday that the Baltic Sea was a VERY dark blue colour (about -2 deg C from
normality on the scale)
Today, the same area is predominantly a cyan colour ( ie: 0 deg C away from normal.)

Does this imply that the Baltic Sea has actually risen in temperature?
Or perhaps it has just remained the same temperature at a time when it normally should drop in
temperature.

Is "normailty" defined as the average temperature for the same date over x number of years? If so,
what is the value of x ?

Brendan




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Old November 3rd 03, 09:27 PM posted to uk.sci.weather
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Posts: 23
Default SST Anomaly


"Brendan DJ Murphy"
wrote in message
...
Can somebody please explain exactly what is

being shown he

http://tinyurl.com/rekh

I assume it shows the difference between the

"current" sea surface temperatures and "normal"
sea
surface temperatures.

My questions is, how do they define "normal" ?

I noticed just yesterday that the Baltic Sea was

a VERY dark blue colour (about -2 deg C from
normality on the scale)
Today, the same area is predominantly a cyan

colour ( ie: 0 deg C away from normal.)

Does this imply that the Baltic Sea has actually

risen in temperature?
Or perhaps it has just remained the same

temperature at a time when it normally should drop
in
temperature.

Is "normailty" defined as the average

temperature for the same date over x number of
years? If so,
what is the value of x ?

There is/are no absolute value(s) of x. If skies
have been clear SST _estimates_ may be quite
accurate (satellite). If not, the error bars are
large (dependent on a few ships, buoys at best).
This is the situation for the daily estimate of
SST.

For the climate/mean values of SST the situation
is a little better, but not much. Therefore, the
SSTA may be larger or smaller than estimated.
Worst case - actual SST is over estimated and
climate SST is underestimated or visa versa.
Persistence, may be the best way to gauge real
anomalies, check daily.







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