The unusual nature of
recent snowpack declines in the North American Cordillera.
Gregory T. Pederson et al., The unusual nature of
recent snowpack declines in the North American Cordillera, Science, vol.
Gregory T. Pederson et al., Regional patterns and proximal causes of
the recent snowpack decline in the Rocky Mountains, US, Geophysical Research Letters, vol.
In the Rocky Mountains, spring (February - March) warming since the 1980s has been largely responsible for
recent snowpack declines at mid - and low - elevation sites (Pederson et al. 2013b).
Not exact matches
The findings could serve as a warning sign that engineers need to design stronger structures, especially as glide avalanches may become more frequent: Warmer winters in the future may cause
snowpacks to become, on average, wetter and denser than those seen in winters of
recent decades.
It compared the future to the lowest
snowpack year seen over that
recent 30 - year span.
Well, it nearly * tripled * from mid February to late March, yet never reached above about 65 % of average at any point this season (and
recent record warmth has already triggered melting; the
snowpack is already back down to 55 % of average for the date).
Studies have found that warmer temperatures in
recent decades help explain a downward trend in
snowpack in the western United States, even after patterns of natural climate variability have been considered [9], [56].
So far, though, only minor flooding has resulted from
snowpack melting in
recent days.
A flurry of
recent research strongly suggests that
recent observations like these are indeed linked to California's long - term warming trend — and that
snowpack losses are expected to accelerate further over the next few decades.
This
snowpack accumulation near the poles, which gets its water via the Arctic and Antarctic oceans, that in turn rob it from equatorial latitudes of our oceans, also results in a reduction in the earth's spin axis moment of inertia and causes the spin rate to increase as evidenced in the
recent history of the rate at which Leap Seconds are added to our calendar (see Wysmuller's Toucan Equation for more on this evidence that during this warm time with much greater polar humidity, earlier seasonal, later seasonal and heavier snows are beginning to move water vapor from the oceans to the poles to re-build the polar ice caps and lead us into a global cooling, while man - made CO2 continues to increase http://www.colderside.com/faq.htm).
On the other hand, though, it's a bit discouraging that one of the strongest El Nino events in recorded history brought about a
snowpack which, while much improved over
recent extremely low snow years, was still below average.
But it would take an extended sequence of cool, wet winters to meaningfully replenish depleted groundwater aquifers, improve upon the truly abysmal Sierra Nevada
snowpack in
recent winters, and alleviate some of the long - term ecosystem impacts of California's ongoing record «hot drought.»