[Parameters: Topic='CRYOSPHERE', Term='SEA ICE', Variable_Level_1='ICE EDGES']
Antarctic Peninsula Climate Variability: Observations, Models, and Plans for IPY ResearchEntry ID: scambos_ipyapcv
Abstract: Recent events in the Antarctic Peninsula (AP) demonstrate that ice and climate systems can change rapidly in a warming world. Air temperatures in the AP have risen six times faster than the global average in recent decades, which has triggered glaciological and ecological events in the last 1,000 years that are unique in the history of the region. Studies based on remote sensing and the available ... in situ data show that a complex interaction is underway, one that involves climate warming, air and ocean circulation changes, sea ice retreat, and surface and basal melting of land and shelf ice. Such changes have contributed to melt percolation and fracturing, seasonal fluctuations in ice flow, and rapid glacial acceleration in the aftermath of shelf breakup. As shelves disintegrate, they uncover a glacial history preserved on the sea floor beneath them, indicating that the current retreats are rare to unprecedented in the Holocene. Biological and oceanographic studies are active along both coasts, as scientists strive to understand how ocean currents and ecosystems migrate during climate change. During a period of rapid change, the recent discovery of a new chemotrophic ecosystem native to the sub-iceshelf environment confirms that there are still unknowns in the Earth and life systems of the AP.
The goals of the Antarctic Peninsula Climate Variability (APCV) workshop are:
- Present the most recent research results and identify the current frontiers
of knowledge in the AP ice and climate systems.
- Discuss evolving research plans for the IPY period, and promote the
formation of collaborative interdisciplinary research groups.
- Provide a forum for graduate-student presentations.
- Discuss outreach ideas and plans for IPY-AP activities.
- Discuss national and international logistical assets and possible logistical
linkages for conducting IPY-period field work.
The workshop reviews recent high-profile research results. Warming has continued in the AP area through at least 2003 (Skvarca and DeAngelis, 2003; Morris and Vaughan, 2003), and an exceptional weather pattern in 2002 led to both unprecedented summer warming and intense, prolonged surface melting, which culminated in the disintegration of the Larsen B ice shelf (van den Broeke, 2005; Rack and Rott, 2005, in press; Scambos et al., 2003). Subsequent to this disintegration, significant glacier acceleration and thinning occurred (Rignot et al., 2004; Scambos et al., 2004), confirming the link between ice shelf stability and glacier force balance. This had been previously suggested by observations of the Larsen A feeder glaciers and the valley walls of the Larsen B glaciers (Rack and Rott, 2002; DeAngelis and Skvarca, 2003). More broadly, a survey of aerial and satellite photos spanning 50+ years has shown that glaciers throughout the region north of 70° S are presently in retreat, and that this retreat progressed southward as climate warmed in the region in previous decades (Cook et al., 2005). There is substantial evidence emerging that many AP glaciers undergo seasonal accelerations due to melt water percolation, which hastens the mass balance changes in the ice sheet as the melt season lengthens.
CRYOSPHERE > SEA ICE > ICE EDGES
CRYOSPHERE > SEA ICE > ICE EXTENT
CRYOSPHERE > SEA ICE
CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS
CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
CRYOSPHERE > SNOW/ICE
CRYOSPHERE > GLACIERS/ICE SHEETS
CRYOSPHERE > GLACIERS/ICE SHEETS > ICEBERGS
CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER MASS BALANCE/ICE SHEET MASS BALANCE
CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER THICKNESS/ICE SHEET THICKNESS
CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER TOPOGRAPHY/ICE SHEET TOPOGRAPHY
CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER ELEVATION/ICE SHEET ELEVATION
CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER MOTION/ICE SHEET MOTION
ISO Topic Category
Data Set Progress
Phone: 303 492 1113
Email: teds at nsidc.org
National Snow and Ice Data Center CIRES, 449 UCB University of Colorado
Province or State: CO
Postal Code: 80309-0449
Cook, A., A. Fox, D. Vaughan, and J. Ferrigno. 2005. Retreating glacier fronts on the Antarctic Peninsula over the past half-century. Science 308, 541-544. Comiso, J. 2000.
Variability and trends in Antarctic surface temperatures from in situ and satellite infrared measurements. Journal of Climate 13, 1674-1696.De Angelis, H, and P. Skvarca. 2003. Glacier surge after ice shelf collapse. Science 299(5612), 1560-1562.
Scambos, T., C. Hulbe, and M. Fahnestock. 2003. Climate-induced ice shelf disintegration in the Antarctic Peninsula. In Antarctic Peninsula Climate Variability: Historical and Paleoenvironmental Perspectives. Ed. E. Domack et al. Special Issue, Antarctic Research Series 79, 77-92.
Scambos, T. J. Bohlander, C. Shuman, and P. Skvarca. 2004. Glacier acceleration and thinning after ice shelf collapse in the Larsen B embayment, Antarctica. Geophysical Research Letters 31, L18402, doi:10.1029/2004GL020670.
Creation and Review Dates
DIF Creation Date: 2007-08-22
Last DIF Revision Date: 2007-08-24