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Nice job Mike!<br>
<pre class="moz-signature" cols="72">Peter Doran, Professor and John Franks Chair
Department of Geology and Geophysics
E235 Howe Russell Geosciences Complex
Louisiana State University
Baton Rouge, Louisiana, USA 70803
Ph: 225-578-3955
Fx: 225-578-2302
<a class="moz-txt-link-freetext" href="http://geology.lsu.edu/People/Faculty/item73533.html">http://geology.lsu.edu/People/Faculty/item73533.html</a></pre>
<br>
On 7/31/15 7:01 AM, Michael Gooseff wrote:
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Hi all,
<div class=""><br class="">
</div>
<div class="">I thought it might be strategic to contribute a
presentation to this session at AGU (Marcia McNutt is one of the
invited speakers, and Lauren Everett the PRB program officer is
one of the conveners): </div>
<div class=""><b class="">Responding to Rapid Environmental Change
at the Poles</b></div>
<div class="">(it’s a Global Environmental Change session)</div>
<div class=""><br class="">
</div>
<div class="">So, I put together the following abstract with all
of you as co-authors (actually the process is different this
year - you submit an abstract as a lead author and THEN if its
accepted, you add co-authors ). <i class=""><font class=""
color="#e32400">Let me know if you want to see edits. </font></i>I
thought I would put together the broad story on synthesis but
look toward the future for differing recovery or change
timescales across the system with an eye toward what happens in
the coming ‘warming’ decades… Thanks.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">TITLE: The Past as a Window to the Future of
Antarctic Ecosystems - What does 20+ Years of Scientific
Research in the McMurdo Dry Valleys, Antarctica Tell Us About
the Trajectory of Polar Ecosystems?</div>
<div class=""><br class="">
</div>
<div class="">ABSTRACT: The McMurdo Dry Valleys of Antarctica
represent the largest ice-free area of the continent. The
landscape is dominated by glaciers, exposed soils, streams, and
ice-covered lakes, and hosts an incredible ecosystem that is
largely driven by microbes and some invertebrates. Given the low
air temperatures (-18C annual mean), little precipitation
(<10 cm water equivalent/yr), and lack of vegetation cover,
the Dry Valleys ecosystem is strongly influenced by physical
processes. In the past two decades, summer conditions have been
observed to fluctuate significantly. From 1986-2001, the area
experienced a cooling trend and the ecosystem responded with
decreasing soil invertebrate populations, decreased
streamflow, decreased primary productivity in lakes, and
decreased algal biomass in streams. Since 2001, 3 very high
glacial melt years have occurred producing record stream flows
and extensive wetted soils. During this most recent decade, the
levels of closed-basin lakes have risen substantially, with
increasing heat contents, and we have observed increased
permafrost degradation along streambanks. Here we assess the
ecosystem responses of the cooling 'press' that occurred from
1986-2001 and the more most recent decade that has had
several strong pulses of energy driving the system to develop
expectations for the future state and function of this polar
desert ecosystem. We propose that the future trajectory of
climate and energy input to the region will likely be more
inconsistent than the cooling period was. Hence, the ecosystem
will be consistently responding to pulses of change over varying
time periods. We also expect that recovery of the ozone layer
over Antarctica may play an important role in modifying both
regional climate and the Dry Valleys ecosystem.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">cheers</div>
<div class="">-Mike</div>
<div class=""><br class="">
<div class="">
<div class="">
<div style="word-wrap: break-word;" class="">
<div class="">-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-</div>
<div class="">Michael Gooseff, Associate Professor</div>
<div class="">Institute of Arctic and Alpine Research</div>
<div class="">Civil, Architectural, and Environmental
Engineering</div>
<div class="">University of Colorado</div>
<div class="">Boulder, CO 80309-0450</div>
<div class=""><br class="">
</div>
<div class="">email: <a moz-do-not-send="true"
href="mailto:michael.gooseff@colorado.edu" class="">michael.gooseff@colorado.edu</a></div>
<div class="">web: <a moz-do-not-send="true"
href="http://goosefflab.weebly.com/" class="">http://goosefflab.weebly.com</a> </div>
</div>
phone: 303.735.5333</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
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</div>
<br class="">
</div>
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