Profile image
By Desdemona Despair (Reporter)
Contributor profile | More stories
Story Views

Now:
Last Hour:
Last 24 Hours:
Total:

Forest die-offs alter global climate “like El Niño’

Thursday, January 5, 2017 11:02
% of readers think this story is Fact. Add your two cents.

(Before It's News)

Desdemona Despair

Climatic and ecological responses to Amazon and wNA forest loss. Anomalies in annually averaged temperature in Kelvin (panels a, c, e) and annual gross primary productivity in gC/m2yr (panels b, d, f), calculated as the difference between the control and experimental case of forest loss in western North America alone (wNA, panels a, b); the Amazon alone (panels c, d) and the wNA+Amazon together (panels e, f). Values that do not pass a significance test at 95% confidence are not included. Graphic: Garcia, et al., 2016 / PLOS

By Christopher Intagliata
22 November 2016

(Scientific American) – Climate change may be partly to blame for the massive die-off of pine trees in the western U.S. But it works the other way, too: forest die-offs can alter the global climate.

“I like thinking of this as a parallel to something like El Nino.” Abigail Swann, an ecological climatologist at the University of Washington. “We think these are also going to have climate impacts far away from where those forests are dying. So it’s going to ricochet in other places around the globe.”

To model those “ricochet” effects, Swann and her colleagues used climate simulations to wipe out forests and replace them with grasslands, in the western U.S., the Amazon, or both. They found that losing forests in one part of the globe does indeed affect climate very far away. “And that could be negative in a lot of places, it could be bad for the ecosystems, but you could come up with scenarios where it makes the conditions a little bit better.” [more]

Forest Die-Offs Alter Global Climate “Like El Nino”


ABSTRACT: Forest loss in hotspots around the world impacts not only local climate where loss occurs, but also influences climate and vegetation in remote parts of the globe through ecoclimate teleconnections. The magnitude and mechanism of remote impacts likely depends on the location and distribution of forest loss hotspots, but the nature of these dependencies has not been investigated. We use global climate model simulations to estimate the distribution of ecologically-relevant climate changes resulting from forest loss in two hotspot regions: western North America (wNA), which is experiencing accelerated dieoff, and the Amazon basin, which is subject to high rates of deforestation. The remote climatic and ecological net effects of simultaneous forest loss in both regions differed from the combined effects of loss from the two regions simulated separately, as evident in three impacted areas. Eastern South American Gross Primary Productivity (GPP) increased due to changes in seasonal rainfall associated with Amazon forest loss and changes in temperature related to wNA forest loss. Eurasia’s GPP declined with wNA forest loss due to cooling temperatures increasing soil ice volume. Southeastern North American productivity increased with simultaneous forest loss, but declined with only wNA forest loss due to changes in VPD. Our results illustrate the need for a new generation of local-to-global scale analyses to identify potential ecoclimate teleconnections, their underlying mechanisms, and most importantly, their synergistic interactions, to predict the responses to increasing forest loss under future land use change and climate change.

Synergistic Ecoclimate Teleconnections from Forest Loss in Different Regions Structure Global Ecological Responses



Source: http://www.desdemonadespair.net/2017/01/forest-die-offs-alter-global-climate.html

Report abuse

Comments

Your Comments
Question   Razz  Sad   Evil  Exclaim  Smile  Redface  Biggrin  Surprised  Eek   Confused   Cool  LOL   Mad   Twisted  Rolleyes   Wink  Idea  Arrow  Neutral  Cry   Mr. Green

Top Stories
Recent Stories
 

Featured

 

Top Global

 

Top Alternative

 

Register

Newsletter

Email this story
Email this story

If you really want to ban this commenter, please write down the reason:

If you really want to disable all recommended stories, click on OK button. After that, you will be redirect to your options page.