IceBridge Science Team Meeting
September 27, 2010
Goddard Space Flight Center
Welcome and Introduction
Michael Studinger
IceBridge Project Scientist
Agenda - AM
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Ice Bridge Science Team Meeting
September 27, 2010
Agenda
0830 Welcome and Introduction (M. Studinger)
0840 IceBridge Program overview (Tom Wagner)
Project Goals, Organization and Functional Relationships
0900 ICEsat Project Summary – Zwally, Markus, Neumann
IceBridge contributions to ICEsat1/2 science, planning and links to Cryosat
0930 Science team: Objectives, Responsibilities and Terms-of-Reference (Jezek and Richter Menge)
0945 Brief presentation (one slide) by each science team member as per their proposal:
1) year 1 contributions to project
2) longer term research activities using Icebridge data
1030 Break
1045 Review of IceBridge Instrumentation (Studinger, Instrument team leader?)
1100 Discussion about the unique role of airborne measurements using the Icebridge instrument
suite for terrestrial ice and sea ice studies. Review of the Icebridge implementation experience so
far. (Koenig and Martin)
In what situations are airborne measurements the optimum choice?
How can they best be used to complement current and near future satellite instruments?
Is there sufficient coverage of critical geographic areas in the context of the icebridge mission,
1200 Working Lunch: Discuss approaches to increase broader community involvement in
identifying applications and leveraging opportunities
Break out into separate sea ice and ice sheet discussion groups for:
Agenda - PM
•
•
•
•
•
•
•
•
•
•
•
•
1300 Discussion of primary science-objective priorities in the context of the unique Icebridge
aircraft and instrumentation capabilities - Rignot and Kwok
Parameter focus (measure ice sheet dh/dt; glacier ice/sea ice flux)?? and/or
Process focus (measure and model key glaciers to understand how processes at the surface, margin,
and bed are driving change; sea ice ice-shelf interactions)?? and/or
Climate focus (understand the response of terrestrial and sea ice to climate forcings by providing
tailored data for GCM scale modeling and sea level rise prediction?)?? and/or
Operational focus (consider capacity to support short-term forecasts in support of marine shipping
operations)
1400 Based on science prioritization and an assessment of optimum airborne capabilities, begin a
review of the level 1 science requirements as now tabulated (Jezek and Richter Menge)
1500 Break
Reconvene entire group
1515 Brief Summary of Science Prioritization and Requirements (Richter-Menge and Jezek)
1530 List of tasks, assign responsibilities and develop a schedule for quantitatively justifying the
science requirements and fulfilling project tasks. (Jezek)
1630 Review of action items (Jezek)
1700 Close
IceBridge Program Overview
Tom Wagner
IceBridge Program Scientist
Program Goals
The first phase of IceBridge will include the following:
• Making airborne altimetry measurements over the ice sheets and sea ice to extend the
record of observations begun by ICESat.
• Linking the measurements made by ICESat, ICESat-2, and CryoSat-2 to allow accurate
comparison and production of a long-term, ice altimetry record.
• Using airborne altimetry to monitor key, rapidly changing areas of ice in the Arctic and
Antarctic to maintain a long term observation record, improve understanding of glacial
dynamics, and improve predictive models of sea level rise and sea ice cover.
• In conjunction with altimetry measurements, collecting other remotely sensed data to
improve predictive models of sea level rise and sea ice cover, especially the following:
– Ice thickness and structure;
– Bed topography underlying land-based ice;
– Bathymetry beneath floating ice shelves;
– Snow accumulation and firn structure; and
– Other geophysical constraints that will improve estimates of the geothermal and
oceanic heat flux.
• Monitoring important areas of sea ice for understanding present and future changes in sea
ice cover and thickness.
• Adapting existing instruments for airborne remote sensing of ice by unmanned aerial systems
such as NASA’s Global Hawk.
Science Team Responsibilities
IceBridge ROSES
1) Final development of the IceBridge Science Definition
Document and Level-1 Scientific Requirements Document;
2) Evaluation of the IceBridge mission designs in
achieving the goals defined by the Science Definition
Document and Level-1 Scientific Requirements Document
as requested by the NASA Program Scientist; and
3) Support to the IceBridge Program Scientist and Project
Scientist in the development of the required analyses,
documentation, and reporting during the IceBridge
mission.
IceBridge Contribution to ICESat
1-2
J. Zwally, T. Markus, T. Neumann
ICESat Project Scientists
IceBridge and ICESat 1-2
1) How can Ice Bridge instruments and flight
lines benefit the scientific analysis of existing
ICEsat-1 data?
2) How can Ice Bridge data collections enhance
the science transition from ICEsat-1 to ICEsat-2?
3) How do you think Ice Bridge data could help
tie together ICESat 1/2 and Cryosat science?
4) How can Ice Bridge data best aid planning for
ICESat 2?
5) Incorporate ICESat 1/2 project needs into a
decision matrix for IceBridge flight planning
Science Team Objectives
K. Jezek and J. Richter-Menge
Science Team Co-leads
IceBridge Science Team
Primary Function
Level 1
Requirements
Flight Lines
Data Collection
Science
Priorities
Evaluation
Science Team Meeting Objectives
1) Review science team project responsibilities and team member
project contributions.
2) Understand functional relationships between the science team
and other Icebridge project elements (eg Science Working Group).
2) Review the over-arching science themes presented in the draft
project plan? How will Icebridge measurements complement
existing ICEsat-1 research, ongoing Cryosat-2 research, and planned
ICEsat-2 research as well as supporting measurement continuity?
3) Review and begin to refine the draft level 1 science
requirements. Start to develop a quantitative basis for the
requirements. Is there traceability from the science requirements
back to the science themes and sensor continuity goals? What the
science mission success criteria?
4) Establish a science team schedule of deliverables.
Project Tasks for Discussion
1.
Complete the writing of official IceBridge Level 1 requirements and science
contribution to project plan (Science definition document);
2. Construct flight lines with science justification for each campaign;
3. Begin with planning for the Greenland experiment where constraints introduced
4.
by P-3 weight limits must be considered.
5. Develop a mission continuity/sensor inter-calibration plan
6.
Establish a prioritized check list for selecting ice bridge flight lines (and lead
instruments) in the context of mission continuity, parameter studies, process
studies, prediction models. Can we assign rough percentages of time to be
allocated to each of these focus areas?
7. In collaboration with the instrument team establish a policy for instrument
upgrades/additions
8. In collaboration with the data science working group, monitor data availability
and quality.
9. Develop a data policy for ground over-flights. This is becoming more and more
an issue.
10. Assess the need to capture seasonal variations (ice sheets) and if required
develop a strategy for data acquisition.
11. Develop a strategy for quick response to calving events etc.
Science Team Member
Summaries
IceBridge Observations of Fast Glaciers of the Polar Ice Sheets
Kenneth Jezek, Science Team Member
Byrd Polar Research Center
The Ohio State University
[email protected]
614 292 7973
Dana Floricioiu, Proposal Partner
German Aerospace Center
Remote Sensing Technology Institute
Tel: +49 8153 28 1763
[email protected]
Project Responsibilities
Year 1: Science Team lead for ice sheets
Update Science requirements contribution to science
plan
Develop calibration Validation plans
Oversee flight planning for Greenland and Antarctica
Foster discussion about hypothesis driven missions
Year 2 Science Team Member
Evaluate options for moving from nadir ice sounding
measurements to swath measurements of ice
thickness and basal reflectivity.
Radar data validation
Contribute to flight planning
Year 3 Science Team Member
Radar data validation
Contribute to flight planning
Assist with an evaluation of Icebridge progress in
fulfilling science requirements
Research Goals with DLR
Year 1
Investigate TSX and R2 polarimetric applications to
ice sheet surface properties
Begin using TSX velocities to compute mass fluxes
from Antarctic outlet glaciers.
Year 2
Combine IceBridge topography and thickness data
with TSX velocities to identify the important
stresses controlling outlet glacier flow
Year 3
Conclude measurements of outlet glacier stress
patterns and determine what insight these provide
for future ice sheet behavior
Optimizing Airborne Observations of Sea Ice
Thickness and Snow Depth through the
Integration of Additional Data Sets
Jackie Richter-Menge and Thorsten Markus
Goal : Optimize IceBridge sea ice results by leveraging other
national and international activities and assets
Specific objectives:
• Identify potential cal/val opportunities
• Interface with in-situ data collection efforts to:
i) Optimize types of variables collected and the data management
ii) Optimize measurement strategies addressing differences
in spatial and temporal scales
Sea Ice Team Leader:
• Oversee team efforts to provide expert scientific guidance in areas of flight line
planning, measurement strategies, data quality control, and data product
development
• Update IceBridge Level 1 requirements (complete by 12/2010)
• Consider operational (versus climatological) applications
R. Kwok – IceBridge Science Team Member
Service as a member of the IceBridge Science Team
(IST) member
Specifically, as a science team member, I will
provide scientific input to the IceBridge project in the
areas of flight line planning, measurement strategies, data
quality control, and data product development. I will
contribute to:
a) the development of the IceBridge Science
Definition Document and Level-1 Scientific
Requirements Document;
b) the evaluation of the IceBridge mission
designs in achieving the goals defined by the
Science Definition Document and Level-1
Scientific Requirements Document; and
c) support to the IceBridge Program Scientist
and Project Scientist in the development of the
required analyses, documentation, and reporting
during the IceBridge mission.
Ron Kwok Jet Propulsion Laboratory
California Institute of Technology
4800 Oak Grove Dr Pasadena, CA
91109
email: [email protected]
Ph: 818 354-5614
Cell: 818 359-48
Utilizing the IceBridge data for sea ice investigations
With the over-arching goal of establishing, extending, and
linking the ICESat-I sea ice thickness estimates through the
CryoSat-2 mission to the launch of ICESat-II (~2015), I plan to
use the IceBridge data for the following purposes:
•Compare/cross-calibrate the ICESat-I freeboard and
thickness data with the IceBridge estimates acquired
during the Spring of 2009.
•Assess the use of IceBridge flight lines for estimates of
the changes in the Arctic Ocean ice cover in the absence of
basin-scale coverage.
•Examine the use of the snow depth radar for providing
estimates of snow depth and snow loading along coincident lidar and radar flight lines.
•Explore the utility of the IceBridge acquisitions for
characterization of the Southern Ocean ice cover.
Investigation of optimal flight lines
for bedrock sampling
Sophie Nowicki
NASA Goddard Space Flight Center
Code 614.1, Greenbelt, Maryland 20771.
E: sophie.nowicki @ nasa.gov Tel: 301.614.5458
Goal: Investigate the type of
bedrock features that IceBridge
measurements should aim to
capture for ice sheet models.
Specific objectives are to investigate with a full Stokes model:
1. what matters? Assess the influence of variations in basal
topography and slipperiness on ice flow.
2. how well? Assess the spatial sampling required to capture the
bedrock information.
As a science team member, I will also interface with the ice sheet
modeling community (ex: SeaRISE group) and CryoSat2 group.
Ron Lindsay, sea ice team
Polar Science Center
Applied Physics Laboratory
University of Washington
Planned contributions to the team include:
•Help with flight line planning, data evaluation, snow depth
measurements, and data formatting and distribution recommendations.
•Use model simulations to evaluate the ability of specific flight lines to
answer specific science questions and evaluate their potential to
improve sea ice predictions.
•Add IceBridge sea ice thickness data to the new Unified Sea Ice
Thickness Climate Data Record (psc.apl.uw.edu/sea_ice_cdr) so it is
readily available alongside submarine, moored, ICESat-1and other
airborne measurements.
•Use all the ice thickness data, including those from IceBridge, to form
a calibrated ice thickness data record that is complete in time and space,
effectively interpolating the sparse observations to all locations within
the Arctic ocean.
Eric Rignot,
Department of Earth System Science,
University of California, Irvine
•Use IceBridge data (ice thickness and laser altimetry) to complete the estimation of grounding line fluxes
around Antarctica and Greenland and assess their contribution to sea level change.
•Use IceBridge gravity-derived (+thickness) bathymetry and other data to calculate ocean temperature,
salinity and submarine ice-shelf melt rates and tidewater glacier fronts using the MITgcm to better document
ocean thermal forcing on ice sheets.
•Develop an improved understanding of ongoing changes in northwest Greenland and Pine Island Bay,
Antarctica using numerical ice sheet models constrained by IceBridge data (laser, thickness, gravity) to
provide better guidelines for future IceBridge data collection.
IceBridge Observations of Sea Ice Thickness, Structure,
and Volume Change: Bringing a NOAA Viewpoint
PI: Dave McAdoo
Co-I: Laurence N. Connor, Collaborators: S.L. Farrell, P. Clemente-Colon
Science Focus:
IceBridge can augment the exploitation of ICESat and Envisat and
now the nascent Cryosat-2 time series of sea ice freeboard
observations to better estimate ice structure and thickness in the
Arctic Ocean and in the Antarctic. IceBridge will enhance the utility of
synoptic mappings of Arctic sea ice observations provided now and in
the near future by Envisat and CryoSat-2, and in the recent past by
ICESat.
Strategy Specifics:
Figure A
(1) Continue annual repeat series of Enivsat RA-2 IceBridge underflight
lines that began in 2006 in the eastern Canada Basin [Figure A]
(2) Build annual repeat time series of CryoSat-2 underflights which
began with IceBridge observations of April 20, 2010 [Figure B]
(3) Maintain annual repeat series similar to (1) and (2) above along
ICESat-1 line in the Canada Basin (northern Beaufort Gyre region)
(4) Reprocess IceBridge Sanders gravity in (1), (2) and (3) above to
extract along-track geoid slopes. Estimate along-track meso-scale (15 to
300km wavelength) variations in sea surface topography jointly with
along-track ice freeboard fluctuations.
Figure B
S.B. Luthcke OIB Research Responsibility
• Develop and provide local, tailored GRACE hi-res mascon solutions to support OIB mission planning and
data analyses efforts.
• Advance ICESat-1 observations of ice sheet evolution through improved accuracy and error
characterization. Use OIB observations directly and in combination with rigorous simulations to improve
ICESat-1.
• Data corrections (e.g. pointing and ranging biases)
• Measurement modeling and observation algorithms (e.g. improved repeat track and xovers)
• dh/dt estimation algorithms (e.g. Optimal Anisotropic Non-Symmetric Filters using improved signal
and noise covariance).
• Estimates of systematic and sampling errors.
• Combination solutions with other data such as GRACE.
• Fully characterize the performance of future spaceborne instruments, and refine and optimize designs and
data reduction algorithms.
• Specifically targeted at ICESat-2 and DESDynI-Lidar
• Use OIB observations to develop detailed measurement models and simulations.
• Fully characterize and quantify error sources to focus mission design and development on those
areas of importance and to significantly improve mission trade space assessment.
• Further develop and refine observation and solution estimation algorithms.
• Leverage the analyses and results from above to develop the methods and algorithms, and the
observational data to support the inter-calibration of ICESat-1, ICESat-2 and DESDynI-Lidar.
• Finally, what can OIB and future airborne missions do for GRACE, GRACE-FO (validation when using
tailored hi-res mascon solutions), and GRACE-II which promises much higher spatial resolution and
accuracy?
Altimetry data analysis in support of NASA’s IceBridge
program.
Ben Smith
University of Washington
APL polar science center
bsmith @ apl . washington . edu
206 788 5374
Goals:
-Integrate ICESat-1 and Icebridge data to improve models of
spatial and temporal ice sheet surface variability
-Establish datasets for ICESat-2 data modeling
-Monitor changes in outlet-glacier discharge and force
balance
-Analyze Icebridge data collected under cloudy conditions in
preparation for Icebridge- ICESat-2 comparison and
cross-calibration
ICESat-2 development makes extensive use of ad-hoc ice
sheet surface models. By investigating elevation changes as
revealed by ICESat-1 – Icebridge data comparisons I will help
make these models more realistic, and will help to identify
areas where Icebridge data can be particularly helpful in
constraining ice sheet changes. I will also, on an opportunistic
basis, analyze airborne laser altimetry data collected by
Icebridge under cloudy conditions, as a precursor to future
work calibrating ICESat-2 data collected through clouds.
IceBridge Instrumentation
M. Studinger
The IceBridge Experience to Date
S. Martin and L. Koenig
Project Overview
1) How IceBridge came to be;
2) History of the IceBridge documentation to date;
3) How we did the flight planning:
Community input, Science priority, Instrument priority, Field Scientists decisions
4) Lesson learned/Our recommendations:
Necessity of cloning John Sonntag;
Problems with workload distribution for science/instrument participants, given 6
years of back-to-back Antarctic and Greenland field seasons;
5) Responsibilities of the science team members from our perspective:
Role is to gather data for the polar communities, plus provide input to IPCC;
No one gets a pet project;
Provide oversight for SE Alaska and ICECAP flights funded by IceBridge;
Encourage analysis and publication of results, participation of junior scientists;
6) Decisions that still need to be made based on the Science team input:
Determination/clearly written documentation of the time each instrument flies;
Determination/clearly written documentation of the amount of time devoted to sea
ice and ice sheet research;
7) Your new job;
Complete the writing of official IceBridge Level 1 requirements and project plan;
Construct flight lines with science justification for each campaign;
Begin with planning for the Greenland experiment where constraints introduced
by P-3 weight limits must be considered.
Level 1 Science Requirements
Review
Science Objectives
(following is from the draft project plan)
• What are the major forces and mechanisms causing the ice sheets to lose
mass and change velocity, and how are these parameters changing over
time?
• How does the ice sheet/glacier bed topography, ice shelves/tongues, and
grounding line configurations effect ice dynamics?
• How does the bathymetry beneath ice shelves and the ocean/ice sheet
interaction effect ice sheet/glacier flow dynamics?
• What are yearly snow accumulation rates over the ice sheets and sea ice?
• What is the snow depth on sea ice and how does snow depth affect the
radiation and temperatures budgets in the Arctic?
• What are projected declines in extent and thickness of the Arctic sea ice
and how will these declines affect the ice albedo feedback in climate
models?
Ice Sheet Requirements
• The objectives are:
• To monitor changes in Greenland and Antarctic ice-sheet elevations
during the gap in satellite coverage between ICESat-1 and ICESat-2.
• To provide a dataset for cross-calibration and validation of ice-sheet
elevations from satellite lidars (ICESat-1, ICESat-2, DesDynI-Lidar)
and radars (CryoSat-2 and Envisat).
• To provide a dataset for improving the ICESat-1 ice-sheet elevation
time series, including better characterization of ICESat-1 errors.
• To provide a dataset for improving numerical models of ice-sheet
dynamics, especially maps of the bed beneath glaciers and ice
shelves.
• To provide a dataset for improving instrument simulation and
performance analysis in support of future missions, such as ICESat-2
and DesDynI-Lidar.
• To support, when feasible, field programs in Greenland and
Antarctica.
•
Ice Sheet Science requirements:
•
•
•
•
•
•
IceBridge shall make altimetry measurements that enable determination of surface elevation change to an
uncertainty of 10 cm/yr over outlet glaciers of the Greenland and Antarctic ice sheets.
IceBridge shall make measurements that enable determination of surface slopes to an uncertainty of 0.5°.
IceBridge shall fly at least 250,000 total km per year, with 30,000 km per year specifically along ICESat-1 tracks
over sea ice and land ice.
IceBridge shall fly at least 500 km per year as underflights along CryoSat-2 tracks over sea ice and land ice.
IceBridge shall, for at least two field seasons, make altimetry measurements along a swath of the southern limit
of the ICESat-1 tracks, enabling direct comparisons of surface elevations for a large number of ICESat-1 tracks.
IceBridge shall make repeat altimetry measurements that enable determination of surface elevations, and surface
elevation change, in critical areas where ICESat-1 data are limited or non-existent, including:
–
–
–
–
–
–
•
•
•
•
Coastal Greenland
Antartica’s Pine Island, Thwaites and Crane Glaciers
Amundsen Coast
Antarctic Peninsula
Accessible areas of East Antarctica
Accessible areas of the South Pole region not surveyed by ICESat-1
IceBridge shall make radar measurements that enable mapping and characterization of the bedrock beneath landbased ice as follows: For Greenland: in consideration of existing data, to establish a 100 km by 100 km grid and
provide 10 km by 10 km grids over five major outlet glacier catchments. For Antarctica, provide mapping over
accessible outlet glaciers that improve numerical models of ice sheet flow according to the priorities in #4.
IceBridge shall make gravity measurements that enable the determination of bathymetry beneath ice shelves and
sub-ice-sheet bedrock topography that cannot be mapped with radar for five key outlet glaciers in Greenland and
accessible portions of Antarctica according to the priorities in #4.
IceBridge shall conduct flight experiments that enable the inter-calibration of the flight instruments and the
characterization of their errors.
IceBridge shall in conjunction with altimetry measurements make measurements to determine the thickness and
structure of the snow and firn layer.
Glaciers
•
•
•
•
•
•
•
•
•
•
•
•
IceBridge Mountain Glacier and Ice Cap Science Requirements
The objectives are:
To monitor changes in selected mountain glacier and ice-cap elevations during the gap in
satellite coverage between ICESat-1 and ICESat-2.
To provide a dataset for cross-calibration and validation of glacier and ice-cap elevations from
satellite lidars (ICESat-1, ICESat-2, DesDynI-Lidar) and radars (CryoSat-2 and Envisat).
To provide a dataset for improving the ICESat-1 ice-sheet elevation time series, including
better characterization of ICESat-1 errors.
To improve our understanding of tidewater glacier dynamics and the role that they play in the
stability of ice sheets.
To map the bed beneath selected mountain glacier and ice-caps.
Science requirements:
IceBridge shall provide annual surveys of the 50 most important glaciers and ice caps around
the Arctic to sea level rise estimates.
IceBridge shall provide at least 15,000 km of centerline profiles along these glaciers and ice
caps.
IceBridge shall provide swath maps with a 1-m x 1-m lidar point density, 500 meters wide,
with a 30-cm vertical accuracy.
IceBridge shall provide at least 50 crossovers with CryoSat-2 and ICESat tracks.
Sea ice
• The objectives are:
• To monitor changes in Arctic Ocean sea ice freeboard and
thickness during the gap in satellite coverage between ICESat-1
and ICESat-2.
• To provide a dataset for cross-calibration and validation of
freeboard and thickness estimates from satellite lidars (ICESat-1
and ICESat-2) and radars (Envisat and CryoSat-2).
• To provide a dataset for understanding the snow depth
distributions of the Arctic and Southern Oceans, and for
improvements in thickness retrieval algorithms.
• To understand the feasibility and limitations of sea ice thickness
retrieval in the Southern Ocean ice cover from satellite lidar and
radar freeboards.
• To support, when feasible, field programs in the Arctic and
Southern Oceans.
•
•
•
•
•
Sea Ice Science Requirements:
IceBridge shall make surface elevation measurements that enable determination of sea-ice
freeboard to an uncertainty of 5 cm at 500 m length scales.
IceBridge shall make elevation measurements of the air-snow and the snow-ice interfaces
that enable the determination of snow depth to an uncertainty of 5 cm at 500 m length
scales.
IceBridge shall provide annual acquisitions along near-exact repeat tracks during the late
winters of the Arctic and Southern Oceans.
IceBridge shall provide capability, annually, to fly at least four 1500 km tracks during the late
winter of the Arctic Ocean and at least four 1500 km tracks during the late winter of the
Southern Oceans. The location of exact tracks shall be determined by the IceBridge Science
Team.
IceBridge shall include flight tracks for sampling of the:
– Perennial and seasonal ice covers between Greenland, the central Arctic, and the
Alaskan Coast.
– Multi-year sea ice pack north of Ellesmere and Greenland.
– Sea ice across the Fram Strait flux gate.
– Sea ice cover in Eastern Arctic North of the Fram Strait.
– Bellingshausen Sea ice cover.
– Weddell sea ice between tip of Antarctic Peninsula and Cap Norvegia.
– Mixed ice cover in the western Weddell between the tip of Antarctic Peninsula and
Ronne Ice Shelf.
– CryoSat-2 ground tracks (coincident when possible).
Points to Consider for the Updating Requirements
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
What are the complementary requirements in support of ICESat continuity including cross comparison
with Cryosat?
What sorts of specific modeling questions are IceBridge data intended to support? What are the
outstanding modeling/prediction questions that could be resolved with IceBridge data?
How should resources be partitioned between sea ice, ice sheets, ice caps, etc.
How should resource be partitioned between mission continuity, calibration, parameter measurements,
process studies, modeling/prediction studies.
Does the science team have any requirement on instrument/configuration stability? When should
instruments be upgraded? When should new instruments be added? Are all instruments routinely
needed?
How are the total flight miles for science and Icesat continuity justified (other than cost)
Ice sheet surface slopes are usually less than 2 degrees, where does the 0.5 degree slope error come
from?
Critical areas seem to ultimately encompass all of the Greenland and Antarctic ice sheets. Can this be
refined?
Should there be requirements for gathering information about ice sheet basal conditions and processes at
grounding line?
Why is ice sheet gridding specified for radar but not the other instruments? Where do the gridding
requirements come from? Why not swath mapping?
What measurements are contributing to improved modeling of tidewater glaciers? What accuracy is
required
What are the 50 most important glaciers to monitor?
Does the ATM provide 5 cm height accuracy for freeboard measurements? What is the requirement on ice
thickness and is this consistent?
How successfully can an airborne program “To monitor changes in Arctic Ocean sea ice freeboard and
thickness during the gap in satellite coverage between ICESat-1 and ICESat-2.” Select monitoring sites
seem feasible but then what sort of modeling is required to extrapolate across the basin.
What does it mean to have a 5 cm accuracy on sea ice snow cover given the prevalence of snow layer
flooding in the Antarctic?
What are the IceBridge success criteria?
Science Requirements Discussion
Summary
J. Richter-Menge and K. Jezek
Task List and Schedule
Jezek
Action Item Review
Jezek
Coming Events
• October start of informal discussions and
telecons for Greenland flight planning
• AGU Town Hall Meeting
• January PARCA/IceBridge Science team
meeting at GSFC
• Summer 2011 IceBridge Flight Planning and
Science Team meeting (JPL?)