Larry raises a good question about ocean temperatures. I do not have an answer for that. Another area where there is a much shorter period of data is Arctic sea ice extent. The data only extends to 1979. This is because the use of satellites in gathering the data. The years from 2007 through 2012 are all below what is a 32 year average. What is more revealing is all of them are well below two standard deviations less than the average and approach four standard deviations For this to be the case, there would need to be several years of above average to put the average where it is. This year is on pace to continue this streak. What is also of note is the average age and thickness of sea ice is also in a marked decline. For older data, we have only anecdotal information from early explorers and more current information from scientific expeditions. I have not seen a compilation of this. Norm Erthal Arvada, CO
On Tuesday, May 14, 2013 12:05:01 PM UTC-6, Scott Severs wrote: > During survey work this AM I was struck by the state of slow leaf out in > the cottonwoods. It made for amazing observing conditions for arriving > migrants, and it seems many species will arrive before well ahead of the > majority of leaf out, making for great but odd observing conditions. I was > especially struck by seeing Warbling Vireos and Orchard Orioles on bare > branches today! > > --Scott > > Scott E. Severs > Longmont, CO > -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/d77041fb-00ac-4e7d-b51f-d9e1226cdc0b%40googlegroups.com?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
