Mountain meadows disappear and streams getting warmer

Imagine a world where the number of mountain meadows, filled with wildflowers shrinks rapidly. Disappearing snowpack and longer growing seasons not only allow trees to invade these precious alpine ecosystems in this place.

But it also is warming streams and reducing flows to make them less favorale for trout and other native aquatic species. This place, as you probably guessed, is the Pacific Northwest and these rapid changes have been documented by scientists from Oregon State University and federal agencies.

A recent analysis of a subalpine meadow complex in the central Oregon Cascade Range, found tree occupation rose from 8 percent in 1950 to 35 percent in 2007. Another study released last week found that in 22 “minimally human-influenced” streams across the region, including Idaho temperature rose and flows late in the season dropped significantly since 1950.

These two studies are just the latest signs of how our world already is changing due to the warming of the Earth. The stream studies showed the rivers were more complex than scientists initially thought, affected in part by groundwater levels.

But like many of these trends scientific studies are give managers the first level of he tools they will need to help adapt management to these changes, which will continue no matter what actions are taken to halt or revere climate change.

choices

The much better read is here:
http://www.sciencedaily.com/releases/2012/11/121102205141.htm

a single meadow

"subalpine meadow complex"

Complex?

The study was a single meadow.
The meadow included a debris flow coming from the steeper slope and the study found the debris flow created conditions more favorable for tree invasion.

So ONE meadow showed the increase.
If a study was done a ONE meadow with decreasing tree growth, shall we conclude global warming is decreasing our forests?

***
Cut em down!

IF trees invading "these precious alpine ecosystems" is a bad thing as the Rock implies, then we should cut down the trees.
Problem solved.

***
Evolution. Adaptation. Time.

Its not a single meadow.

Its not a single meadow. "Complex" means a group of them.

yippy

You would think that is what complex means.

"In this study, it appears that snowpack was a bigger factor than temperature in allowing mountain hemlock tree invasion of Jefferson Park, a 333-acre meadow which sits at the northern base of Mount Jefferson, a towering 10,497-foot volcano northwest of Bend, Ore."

Notice "a meadow" as in singular.

***
And how long would it take to find "a study" that shows climate change is reducing tree forests?

Hold on..

from the paper:
"Snow depth and its seasonal persistence are known to control treeline movement and subalpine meadow tree invasion in the Pacific Northwest (Fonda and Bliss 1969; Rochefort and Peterson 1996; Miller and Halpern 1998). However, these prior studies did not co-measure tree invasion and snow depth across multiple environmental factors or spatial scales. By relating tree invasion to regional climate and co-measuring snow depth and abundance of tree invasion, we found evidence that snowfall and snow depth may shape temporal and spatial patterns of tree invasion. In addition to snowfall, we found invasion was also associated with temperature (spring maximum and summer minimum temperatures on glacial landforms, and spring temperatures on debris flows), although the magnitude these associations was smaller than for snow variables on glacial landforms."
and
"The association we found between tree invasion and snow may be unique to high elevation systems in maritime climates, emphasizing the importance of regional and local studies, and cautions against extrapolating relationships between climate and tree invasion from more continental or arid climates. Regional models project modest increases in temperature and small changes in annual precipitation, but large future declines in spring snow water equivalent (Salathé et al. 2008; Mote and Salathé 2010), conditions favorable for accelerated tree invasion in the future. However, uncertainty in regional and global climate models is often greatest for precipitation and snowfall, especially in areas with complex mountainous terrain and ocean-land interactions (Good and Lowe 2006; Salathé et al. 2008). Additionally, lower snow depth and rapid tree invasion on debris flows that was not associated with annual and spring snowfall suggests a threshold of snow depth and persistence may exist, below which rapid tree invasion may occur. Threshold snow levels could greatly alter our understanding of potential tree invasion in the future, but observational and experimental evidence regarding threshold snow effects on tree invasion are lacking."

Here we have Idaho

The water study included TWO sites in Idaho.
Clearwater at Orofino and the North Fork of the Clearwater.

So Orofino is "minimally human influenced"?
And whatever effect the N. fork of ANY river has it will obviously affect the main river of the same. Bad test sites.

****
In another study (May 2012) by the SAME author, Ivan Arismendi, the headline is:

The paradox of cooling streams in a warming world: Regional climate trends do not parallel variable local trends in stream temperature in the Pacific continental United States

The paradox of cooling streams in a warming world: Regional climate trends do not parallel variable local trends in stream temperature in the Pacific continental United States

Key Points
•Recent trends in stream temperature do not parallel climate-related trends

•Minimally human-influenced streams are not showing consistent warming trends

•Greater complexity than previously assumed in thermal regimes of streams

http://www.agu.org/pubs/crossref/2012/2012GL051448.shtml

And when we're all dead it will be done. YAY

----------

Celebrating five years and one screen ID >|<

Huh?

Lets see, 15,000 or so years ago there were no trees here, and lots of ice. Ice flows carved out mountain bowls that filed with melt water and created lakes. Eventually these "bowls" silted in and meadows flourished. Trees eventually took over and we have a forest where a lake once was. Climate change created the forest - with a lot of help from absent minded squirrels.

And no help from Moose!

----------

If you still print the same stuff everybody else gets from AP, Reuters and Yahoo! without subtantive local content beyond this, you are doomed to fail wanting money from me.

I like warm springs because when water is warm....

the fish die and float to the top....

much easier for a city survivalist to catch fish and eat....