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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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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 |
#2
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![]() "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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