[Lcefiec] MAÑANA: COLOQUIO ESPECIAL: "Ongoing Changes in Glacier Elevation and Mass, Larsen A and B Embayments, Antarctic Peninsula" - Dr. Christopher A. Shuman (NASA)

[coloquios]

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Coloquio del Departamento de Ciencias de la Atmósfera y los Océanos
(DCAO)/
Centro de Investigaciones del Mar y la Atmósfera (CIMA)

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Miércoles 26 de Octubre, 13hs, AULA 8
 
COLOQUIO
"Ongoing Changes in Glacier Elevation and Mass, Larsen A and B Embayments,
Antarctic Peninsula"

Christopher A. Shuman
UMBC-JCET, Code 698, NASA Goddard Space Flight
Center Greenbelt, MD 20771 USA


Resumen:
We investigate the elevation and mass balance response of northern
Antarctic Peninsula tributary glaciers over the period 2001 to the
present following the loss of the Larsen A and B ice shelves (in 1995
and 2002 respectively). Our study uses MODIS imagery to track ice
extent, and ASTER and SPOT5 satellite stereo-image DEMs plus ATM,
LVIS, and ICESat laser altimetry to track elevation changes, spanning
the period 2001-2010. The measured Larsen B tributary glaciers
(Hektoria, Green, Evans, Punchbowl, Jorum and Crane) have lost up to
(165 m in elevation during 2001-2010. Elevation changes were small for
the more southerly Flask and Leppard glaciers, which are still
constrained by a remnant of the Larsen B Ice Shelf in Scar Inlet. In
the Larsen A embayment, continued thinning of >3 m a-1 on Drygalski
Glacier, 14 years after the Larsen A Ice Shelf disintegrated, suggests
that mass losses for the exposed Larsen B tributaries will occur well
into the future. Grounded ice volume losses now exceed 13 km3 for the
Crane Glacier and 30 km3 for the Hektoria-Green-Evans glaciers. The
combined mean loss rate for 2001-2006 is at least 11.2 Gt a-1 and
continues into the Operation Ice Bridge (OIB) time frame. Our values
differ significantly from other published mass-budget-based estimates
for these embayments, but are a reasonable fraction of GRACE-derived
rates for the overall northern Peninsula mass-loss region (~40 Gt
a-1).
  
Lugar: AULA 8, DCAO,
Pabellón 2,
Ciudad Universitaria.

Los esperamos a todos!

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Grupo Coloquios
Departamento de Ciencias de la Atmosfera y los Oceanos (FCEN-UBA)
Centro de Investigaciones del Mar y la Atmosfera (CONICET-UBA)
Ciudad Universitaria, 2do piso.
email: coloquios at at.fcen.uba.ar
http://www.at.fcen.uba.ar/charlas_not.php
http://www.cima.fcen.uba.ar/espanol/index.htm
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