I have to jump in here. Sorry. When it is warmer in Nome Alaska than Ithaca NY
the jet stream has a very high amplitude. Waves with high amplitude have a lot
of energy. The jet stream derives its energy from the temperature differences
from polar regions to the midlatitudes and subtropics. Stronger temperature
differences lead to high amplitude patterns. So it is the intense cold at high
latitudes that leads to stronger high amplitude patterns that dump cold air
down here. We saw such patterns in the 1960s and 1970s too a globally cool
period. Canada was actually quite cold last winter so we had an highly
amplified jet stream that deposited record cold in the central U.S. A warmer
Canada doesn't lead to cold polar vortexes displaced south. The cold originates
from the Arctic and Canada and becomes so expansive that it reaches our
latitude. There also have been many instances where is can get warmer in Alaska
and colder in the east because of a high amplitude jet stream. The brutal
winter of 1976-77 saw record heat in Alaska in January. This happens more than
you think.
The cold that hit the Rockies this September originated over the land in
northern Canada. It was clear and strong radiational cooling caused it. Global
warming from greenhouse gases would have modified this air mass enough to
lessen the extreme cold. It didn't happen. The cooling "power" of the land
masses of the high latitudes remains intense. We don't get a lot of bitter cold
air from the Arctic ocean. Its Alaska,and northern Canada where we get our cold
from.
On Wednesday, September 16, 2020, 08:03:46 PM EDT, Kevin J. McGowan
<k...@cornell.edu> wrote:
“Record cold of this magnitude is not consistent with global warming. “
Why not? Global warming doesn’t mean warming happens all over the globe evenly.
I’ve been watching our area in the northeast for the last decade, thinking
mostly about Snowy Owl incursions, and I’ve noticed strange changes in the
distribution of cold across the arctic, perhaps changes in the “polar vortex”
that seem to isolate the NE as a cold spot while Alaska warms up. The last ten
years have shown Ithaca regularly with winter temperatures lower than Nome,
Alaska. That isn’t right.
Global warming at the poles doesn’t mean every place warms up, it means that
the consistencies of weather patterns we could count on could be disrupted.
Colder Ithaca winters and heat waves in Alaska are totally consistent with a
global warming scenario. Freak arctic blasts into the rockies while the north
pole melts also points to something freakishly abnormal happening, totally
consistent with global warming.
Kevin
From: bounce-124948138-3493...@list.cornell.edu
<bounce-124948138-3493...@list.cornell.edu>On Behalf Of david nicosia
Sent: Wednesday, September 16, 2020 7:46 PM
To: Peter Saracino <petersarac...@gmail.com>; Jody Enck <jodye...@gmail.com>
Cc: atvaw...@gmail.com; CAYUGABIRDS-L <cayugabird...@list.cornell.edu>
Subject: Re: [cayugabirds-l] New Mexico Mass Motality
The western U.S has a history of extreme temperature changes. This event ranks
number 3 for the biggest temperature swing in history and it occurred during
fall migration. Most of the other big swings in temperature
occurred in the winter. What is dramatic is how cold it got and the early snows
that fell. Temperatures in parts of the Rockies fell to 9F with winds over 50
mph. That is insanely cold for so early in the season. The Arctic high pressure
that came across the Rockies has denser and heavier air which flows downslope
into California, and Oregon warming by compression leading to high winds and
VERY dry conditions. This fuels the tremendous fires. So in a sense it is the
brutal unseasonable cold air that is the real cause of the conditions that
caused the fires. I assume the fires, combined with temperatures in the 80, 90s
and 100s dropping to the teens 20s and 30s in many areas in the Rockies with
early snows was too much for many birds to handle causing the high mortality
rates. I have read that people are blaming climate change on this. I don't see
it because it is the intense cold that really fueled the fires in CA and OR and
probably had a negative effect on the birds. Record cold of this magnitude is
not consistent with global warming.
On Wednesday, September 16, 2020, 05:18:09 PM EDT, Jody Enck
<jodye...@gmail.com> wrote:
Thank, Pete, for passing along the Guardian article. Additional information
has been forthcoming recently. Hypotheses include movements related to smoky
conditions in some states, coupled with those weird temperature swings recorded
last week (90 to 100 F one day and below freezing, with snow, the next day).
Seems less likely to be a nefarious even (e.g., poisoning) than something more
likely caused by challenging environmental factors.
I hope more information comes out soon.
Jody W. Enck, PhD
Conservation Social Scientist, and
Founder of the Sister Bird Club Network
607-379-5940
On Wed, Sep 16, 2020 at 5:03 PM Peter Saracino <petersarac...@gmail.com> wrote:
https://www.theguardian.com/environment/2020/sep/16/birds-falling-out-of-the-sky-in-mass-die-off-in-south-western-us-aoe
On Tue, Sep 15, 2020, 6:47 PM Tom <atvaw...@gmail.com> wrote:
I just learned of the mass mortality of migrating birds in New Mexico. I read
a CNN report. Is there any new information on the cause? They’re talking
hundreds of thousands, even millions.
Tom V
Sent from my iPhone
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