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SUMMARY:EESS talk on "Climate extremes alter controls and pathways of soil
  carbon loss from mountainous watersheds "
DTSTART:20230502T121500
DTEND:20230502T131500
DTSTAMP:20260511T034848Z
UID:f190b7d1f3cdb5a2de7a76c6b317ca8a44e2ef7172ee8ab3ae186d8b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Marco Keiluweit\, Associate professor\,  Institute of Eart
 h Surface Dynamics (IDYST)\, UNIL\nAbstract:\nFloodplains within mountaino
 us watersheds are dynamic reservoirs of carbon\, and experience seasonal f
 looding due to snowmelt and drainage. Climate change is rapidly shifting s
 nowpack levels\, making these ecosystems particularly vulnerable to more e
 xtreme flooding and drought. The variable hydrology drives spatial and tem
 poral redox gradients within floodplain soils\, with largely unknown conse
 quences for carbon storage in and export from such ecosystems. In this pre
 sentation\, I will show how extreme flooding and drought events alters con
 trols and pathways of soil carbon loss within a mountainous floodplain sys
 tem. I will report on an extensive monitoring campaign and associated biog
 eochemical measurements in a headwater catchment in the Rocky Mountains (C
 olorado\, US).  I will examine differences across extremely low and high 
 river discharge years\, which foreshadow climate change predictions in suc
 h mountainous floodplains. Our results suggest that extreme hydrological e
 vents expected with climate change will shift the control on and pathways 
 of C loss from floodplains. Global implications of our findings for predic
 ting climate change impacts on carbon cycling within dynamic floodplain en
 vironments will be discussed.\n\nShort biography:\nMarco Keiluweit is inte
 rested in how carbon and nutrient cycles in soil and sediments respond to 
 climate and land use change. He completed his PhD at Oregon State Universi
 ty\, and worked as a postdoc at Stanford University and an Assistant Profe
 ssor at the University of Massachusetts-Amherst. He is now Associate Profe
 ssor of Soil Biogeochemistry at UNIL. Marco Keiluweit is particularly inte
 rested in fundamental geochemical processes\, biotically-mediated or not\,
  that regulate carbon and nutrient cycles in soils.  His research combine
 s laboratory\, greenhouse\, and field experiments with advanced analytical
  tools such as synchrotron spectroscopy\, chemical imaging\, and molecular
  microbiology. His group’s work links fine-scale biogeochemical mechanis
 ms to landscape-scale processes within natural and managed ecosystems. Mar
 co Keiluweit has acquired numerous grants and has received several prestig
 ious awards\, including US DOE Lawrence Scholar and NSF Early Career award
 s
LOCATION:GC B1 10 https://plan.epfl.ch/?room==GC%20B1%2010 https://epfl.zo
 om.us/j/69011077410
STATUS:CONFIRMED
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