BEGIN:VCALENDAR
VERSION:2.0
PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
BEGIN:VEVENT
UID:69dbc3bde38d1
DTSTAMP:20260412T120933
DTSTART:20170324T120000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20170324T130000
URL:https://murmitoyen.com/events/vanille/udem/detail/758758-a-synthesis-of
 -collaborative-integrated-studies-of-permafrost-disturbance-impacts-on-car
 bon-and-nitrogen-composition-and-export
LOCATION:Université de Montréal - 520\, chemin de la Côte-Sainte-Catheri
 ne\, 520\, chemin de la Côte-Sainte-Catherine\, Montréal\, QC\, Canada\,
  H2V 2B8
SUMMARY:A synthesis of collaborative integrated studies of permafrost distu
 rbance impacts on carbon and nitrogen composition and export
DESCRIPTION:Conférence présentée par Mélissa Lafrenière
\nRésumé:
\n
 Climate change has a direct impact on both on permafrost stability and hyd
 rology. The disturbance of permafrost (both thermal and physical) and chan
 ging hydrological regimes will substantially alter the sources\, transport
 \, and biogeochemical cycling of carbon (C) and nitrogen (N) in arctic wat
 ersheds\, which stand to impact the ecological function of downstream fres
 hwater and marine ecosystems. This seminar will present a synthesis of the
  collaborative and integrated research at the Cape Bounty Arctic Watershed
  Observatory (CBAWO)\, Melville Island\, NU\, that has been investigating 
 the response of organic matter and N dynamics in headwater permafrost wate
 rsheds to disturbance that occurred in response to extreme warming and hea
 vy rainfall in the summer of 2007.  Through a number of collaborative stu
 dies involving the use of spectroscopic and isotope techniques we have bee
 n examining changes in the composition\, source\, and age of both dissolve
 d (DOM) and soil organic matter (SOM) and the composition and source of di
 ssolved nitrogen\, at different catchment scales and temporal resolution.
   Results from these studies indicate that physical disturbance of permaf
 rost leads to the enhanced export of dissolved inorganic N (DIN) as well a
 s older\, fresher\, and likely more labile organic SOM and DOM. The multi-
 year studies also highlight the significance of rainfall as a driver of ex
 port of inorganic N and fresh organic matter.  Furthermore\, our observat
 ions illustrate that these impacts are evident for several years post-dist
 urbance.  As organic matter decomposition is often N limited\, the combin
 ed increase in nutrient and labile carbon export suggests that disturbance
 s may strengthen the permafrost C feedback on climate change. Together the
 se provide important seasonal and multi-year data that can form the basis 
 for modeling the response of C and N cycles to permafrost and climate chan
 ge in the region.
\n 
END:VEVENT
BEGIN:VTIMEZONE
TZID:America/Montreal
X-LIC-LOCATION:America/Montreal
END:VTIMEZONE
END:VCALENDAR