asa's agu talk
TRANSCRIPT
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Evidenceofmeltwaterreten1onwithinthe
GreenlandIcesheet
saK.Rennermalm,RutgersUniversity(SUNJ)LaurenceC.Smith,UniversityofCaliforniaLosAngeles
VenaC.Chu,UniversityofCaliforniaLosAngelesJasonE.Box,OhioStateUniversity
RichardR.Forster,UniversityofUtahMichielvandenBroeke,UtrechtUniversity
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Runoff~50%masslosses
SpaPallydistributedsurfacemassbalancemodels Eemaetal2009,MernildandListon2012,Feweis2007,Hannaet
al2005,vandenBroekeetal2009
MassbalanceesPmatesfromGRACE Woutersetal2008,vandenBroekeetal,2009,Siemesetal2012,
HarigandSimons2012
Increasedrunoff RelevanceforgeochemistryandmicrobialacPvity
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April24,2009photoThe image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.
Photo taken by K. Steffen
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SciencequesPon
Howmuchicesheetsurfacerunoffescapetotheocean?
Whenismeltwaterreleased?
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Howmuchreachestheocean?
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bedrock
ice
firnsnow
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firnaquifer
icelenses
bedrock
ice
firnsnow
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crevasses
supraglacialstreamnetwork
moulins
supraglacial
lakes
firnaquifer
icelenses
bedrock
ice
firnsnow
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crevasses
englacial
drainage
system
subglacialstorage
incavities
subglacial
channels
supraglacialstreamnetwork
moulins
supraglacial
lakes
firnaquifer
icelenses
bedrock
ice
firnsnow
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crevasses
englacial
drainage
system
subglacialstorage
incavities
subglacial
channels
supraglacialstreamnetwork
moulins
supraglacial
lakes
firnaquifer
icelenses
bedrock
ice
firnsnow
Evaporation
Sublimation
Precipitation
Melt
Proglacial
storage
Runoff
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Icesheetcontrolledriver
roglacialriver
dischargemeasurements
Icesheetrunoffvolume
-River
dischargeMeltwaterstorage
Icesheetrunoffmodeling
ElevaPondependentSMB vandenBroekeetal.2008
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Studyarea
DrainageareaesPmaPonwASTERGDEM 64km2
Ice sheet melt
River discharge
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CumulaPveicesheetsurfacerunoff
Rennermalm et al. (2012) The Cryosphere Discussions
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CumulaPveicesheetsurfacerunoff
Rennermalm et al. (2012) The Cryosphere Discussions
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CumulaPveicesheetsurfacerunoff
Rennermalm et al. (2012) The Cryosphere Discussions
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Expectedriverdischarge
Rennermalm et al. (2012) The Cryosphere Discussions
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ActualsituaPon
Rennermalm et al. (2012) The Cryosphere Discussions
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ActualsituaPon
Rennermalm et al. (2012) The Cryosphere Discussions
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ActualsituaPon
Rennermalm et al. (2012) The Cryosphere Discussions
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10-50%retenPon
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Lessthan1%oficevolumeretained
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Rennermalm et al. (2012) The Cryosphere Discussions
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Dampenedriverresponse
Rennermalm et al. (2012) The Cryosphere Discussions
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Coldseasonmeltwaterrelease
Rennermalm et al. (2012) The Cryosphere Discussions
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Morethan10%dischargeislostinthecoldseason
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OtherevidenceforicesheetmeltwaterretenPonanddelayed
release
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Colganetal.(2011)J.Glaciology1DverPcallyintegratedflowlinemodelYearroundsubglacialconduitstorageMeanglacierresidencePmeforwater2.5years
CataniaandNewman(2010)GRLGroundpenetraPngradarersistentenglacialhydrologicfeaturesthroughwinter
Harperetal.(2012)NatureFirnstorage Foresteretal.(2012)AGU
erennialfirnaquifers
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Conclusions
MeltwaterretenPonbeyondayear ColdseasonreleaseofenglacialmeltwaterNosupraglacialorproglaciallakes
InsignificantprecipitaPon Limitedsnow/firnstorage Englacialand/orsubglacialstorage
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Acknowledgements
ThisworkwassupportedbytheNASACryosphererogram(grantNNX11AQ38G),managedbyDr.Thomas.Wagner
Tofindoutmore Rennermalmetal.(2012)TheCryosphereDiscussions SessiononGlacierHydrology,Thursday10:20-12:20inthisroom
ostersinC43CsessionThursday1:406pm: SamiahMoustafa:C43C-0623 AsaRennermalm:C43C-0616