Conifers wrote:Dave Brown wrote:The fens of Norfolk are peat, so there must have been a sustained wet period for that to build up.
That's just because they're at sea level (below sea level now, with shrinkage since artificial drainage started) so the rain that fell in winter stayed put, like a huge reservoir.
The information I read was that the peat had built up during a cold period when the low pressures tracked further south, giving a sustained easterly flow. Here, 100 miles south, if the rain comes from the west, we don't get much. The local saying is "Rain from the east, 24 hours at least" and that tends to be true.
Conifers wrote:
Dave Brown wrote:We seem to have seen a shift in wind direction over the last few years, with Cornwall getting some serious frosts with slack easterlies in winter. In these situations near the east coast has been milder than the west coast, a reversal of what we would normally expect.
It's always been like that when there's easterlies in winter
The plants used extensively in Cornwall suggest -7C to -9C has not been common, although we get periods of easterlies every year.
A roaring easterly will stop a radiation freeze, a slack easterly just counteracts the coastal sea breezes allowing radiation frost right on the coast. If it had always been like that then Cornwall, would not be able to grow any different to Kent, but it does.... or did.
Another major flaw is they they use ice cores, and tree rings to determine global temperature. If what we are seeing now, happened before, those assumptions made are possibly wrong. We are told the earth is warming, but our bit is cooler. If you just happen to compare a cool bit from some time in the past, to a warmer bit now, you would get very exaggerated temperature rises.