Prof.
Buford Price
(U. C. Berkeley)
27/04/2011, 09:00
Opening Remarks
I will explain the logo for the workshop and say a bit about the opportunities for discovery made possible by interdisciplinary efforts.
Terry Benson
(IceCube 222 UW-Madison/PSL)
27/04/2011, 09:10
Innovations in Hot-Water Drilling
IceCube's construction presented massive challenges; at the core was a drilling campaign to melt over 17 million gallons of ice over the course of 7 short field seasons. The Enhanced Hot Water Drill and its team made this possible. Vast amounts of knowledge and experience were gained, and technological innovations were continuously sought out and implemented to overcome the inherent...
Alan Elcheikh
(IceCube)
27/04/2011, 09:30
Innovations in Hot-Water Drilling
In order to complete the construction phase of the IceCube project on time and within budget, a very ambitious construction schedule was planned over 7 short field seasons. The critical path of the construction project was the drilling operation, which required 86 2500-meter holes to be made in the ice. The instruments would then be deployed into these drilled holes. Lessons were learned...
Frank Rack
(University of Nebraska-Lincoln, ANDRILL)
27/04/2011, 09:50
Innovations in Hot-Water Drilling
The ANDRILL Coulman High (CH) Project Site Surveys, which were conducted from November 2010 through January 2011 using the ANDRILL hot water drill system, achieved all primary and secondary objectives. We demonstrated a safe traverse route from McMurdo Station across the Ross Ice Shelf to CH and established safe operating areas using ground-penetrating radar supplemented by airborne radar. A...
Darren Grant
(U of Alberta)
27/04/2011, 11:00
Particle Astrophysics in Ice
Darren Grant
The DeepCore detector, the low-energy extension to the
IceCube Neutrino Observatory, instruments a fiducial volume of up to 35MT
with an energy threshold as low as about 10 GeV. Much of the
success of the achieving a pure neutrino sample in the detector is
the use of the IceCube array as the world's largest active veto for
cosmic ray muons. It is possible...
Dr
Hagar Landsman
(University of Wisconsin - Madison)
27/04/2011, 11:20
Particle Astrophysics in Ice
Building on the expertise gained by RICE, ANITA and IceCube's radio extension in the use of the Askaryan effect in cold Antarctic ice, we are currently developing an antenna array known as ARA (The Askaryan Radio Array) to be installed in boreholes extending 200 m below the surface of the ice near the geographic South Pole.
The cold and deep glacial ice at the South Pole is transparent to...
Mr
Marek Kowalski
(Bonn University)
27/04/2011, 11:40
Particle Astrophysics in Ice
Current supernova detectors will deliver a tremendous neutrino statistics for a core collapse supernova (SN) within our Galaxy or slightly beyond. However, with a rate of 2 SNe per century, awaiting the next discovery requires patience. The perspective changes instantly, once the sensitivity of neutrino detectors reaches a scale allowing the detection of SNe in neighboring galaxies. A...
Reina Maruyama
(University of Wisconsin--Madison)
27/04/2011, 12:00
Particle Astrophysics in Ice
I will describe DM-Ice, a direct detection dark matter experiment to be deployed at the South Pole co-located with the IceCube/DeepCore Neutrino Telescope. This experiment will use roughly 250 kg of low-background NaI detectors to search for the DAMA/LIBRA annual modulation in the southern hemisphere where many of the environmental backgrounds associated with seasonal variations present in...
Christopher Wiebusch
(RWTH-Aachen University)
27/04/2011, 12:20
Particle Astrophysics in Ice
We present initial results from simulations of possible large optical extension of IceCube additional strings optimized for neutrino-astronomy in the TeV-PeV range.
Prof.
Bernd Dachwald
(FH Aachen University of Applied Sciences)
27/04/2011, 14:00
Subglacial Lakes
We present the novel concept of a combined drilling and melting probe for subsurface ice research. This “subsurface icecraft”, named “IceMole”, is currently developed, built, and tested at the FH Aachen University of Applied Sciences’ Astronautical Laboratory. Here, we describe the IceMole’s first prototype design and report the results of its first field tests on the Morteratsch glacier in...
Prof.
Slawek Tulaczyk
(Department of Earth and Planetary Sciences, University of California, Santa Cruz)
27/04/2011, 14:20
Subglacial Lakes
Water is produced at the base of polar ice sheets when geothermal heat and basal shear heating exceed conductive heat escape. Published estimates of subglacial water production rates in Antarctica vary between an average of about 3 and 6 mm per year per unit bed area. This rate of production is almost two orders of magnitude smaller than the mean snow accumulation rate on top of the ice...
D.D. Blankenship
(Institute for Geophysics, U of Texas)
27/04/2011, 14:40
Subglacial Lakes
The evolution of the East Antarctic ice sheet surrounding the South Pole has been complex. Previous work using airborne radar sounding has indicated that the tributaries of major ice streams have reached the South Pole, but details of the position and timing of flow regime change have been unknown. We will present an analysis of internal layering observed in airborne radar sounding data...
Dr
Vladimir Lipenkov
(Arctic and Antarctic Research Institute)
27/04/2011, 15:00
Subglacial Lakes
It is now recognized that subglacial water has been playing significant role in many processes that have shaped the Antarctic continent and its ice sheets today and in the past. Lake Vostok is an essential element of the Antarctic subglacial hydrological system and the largest known subglacial lake on Earth (with an area of about 16,000 km2 and the water volume exceeding 6,000 km3). The...
Dr
Ryan Bay
(UC Berkeley)
27/04/2011, 16:30
Logging and Remote Sensing
While the AMANDA and IceCube experiments have opened a new window on the universe, their use of hot water drills has also opened unique research opportunities by providing recurrent passage to the deep South Pole ice sheet. I will overview how this "fast access" drilling has led to advances in glaciology, climatology, material science and technology development.
Jeff Severinghaus
(University of California at San Diego)
27/04/2011, 17:10
Logging and Remote Sensing
Several "big" questions include: (1) Did the West Antarctic Ice Sheet collapse 125,000 years ago, a time when our climate was several degrees warmer than today? and
(2) Why did Earth's ice ages oscillate within a 41,000-year period between 1.5- and 1.3-million years ago?
These questions require multiple access holes to the deep ice, to map the spatial dimension in a rapid-access mode that...
Dorthe Dahl-Jensen
(Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen)
27/04/2011, 17:30
Logging and Remote Sensing
Panel
Dorthe Dahl-Jensen
(Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen)
28/04/2011, 09:00
A new Greenland ice core has been drilled. The first results from the NEEM ice core are presented and then combined with results from other deep ice cores from the Greenland Ice Sheet.
All of the ice cores drilled through the Greenland Ice Sheets have been analyzed, and the results show that all contain ice from the previous warm Eemian period near the base. Is it thus clear that the...
Frank Pattyn
(Laboratoire de Glaciologie, U Libre Brussels)
28/04/2011, 09:20
Subglacial conditions of large polar ice sheets remain poorly understood, despite recent advances in satellite observation. Major uncertainties related to basal conditions, such as the temperature field, are due to an insufficient knowledge of geothermal heat flow. We use a hybrid method that combines numerical modeling of the ice sheet thermodynamics with a priori information, using a...
Jean-Robert Petit
(UJF-Grenoble)
28/04/2011, 09:40
Polar ice sheets and glaciers contain well-ordered archives of ancient ice that fell as snow, from recently to millions of years ago. The ice composition and impurities, along with the gasses entrapped in air bubbles together provide a unique history of past climate changes and environmental and atmospheric composition. The study of deep ice cores revealed the close link between temperature...
Prof.
Buford Price
(U. C. Berkeley)
28/04/2011, 10:00
Oxygen-producing cyanobacteria originated on Earth around two billion years ago. Two genera of oceanic submicrometer-size cells -- the Synechococcus and the Prochlorococcus -- account for as much as half of the air that we breathe. Winds transport them from polar oceans onto Arctic and Antarctic glacial ice. We find that they are present in the glacial ice at all seven sites and all depths we...
Dr
Robert Mulvaney
(British Antarctic Survey)
28/04/2011, 10:50
The deep ice cores from Antarctica have revealed an unparalleled view of the changes in, and linkages between, the climate and the atmosphere over several climate cycles. Further, comparison of the Antarctic cores with the deep ice cores from Greenland has shown the inter-hemispheric exchange of energy, probably via the Meridional Overturning Circulation, has lead to a difference in phasing...
Dr
Jim White
(University of Colorado at Boulder)
28/04/2011, 11:30
Deep ice cores contain information about past climates that were as warm as, or warmer than, today. These warm times are the nearest analogs for our future climate. This talk will address what key pieces of information are contained in deep ice to inform us about a warmer future, including rates and ultimate fates of sea level rise and abrupt climate change, which is climate change on time...
Prof.
Eli Waxman
(Weizmann Inst.)
Logging and Remote Sensing
The completed IceCube detector achieves the minimum sensitivity required for the detection of high energy extra-Galactic sources of neutrinos. I will discuss the prospects for detecting such sources, and the outstanding astrophysics and physics open questions that may be resolved by their detection. These open questions include the origin of ultrahigh energy cosmic, the underlying physics of...
