Titelmasterformat durch Klicken bearbeiten ESA-CCI Sea Ice ECV 11.02.2014 Stefan Kern*, et al. *)...
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Transcript of Titelmasterformat durch Klicken bearbeiten ESA-CCI Sea Ice ECV 11.02.2014 Stefan Kern*, et al. *)...
Titelmasterformat durch Klicken bearbeitenESA-CCI Sea Ice ECV
04/10/23
Stefan Kern*, et al.
*) University of Hamburg. CliSAP, ICDC
Integrated Climate Data Centre (ICDC) at CliSAP
http://icdc.zmaw.de
Integrated Climate Data Centre (ICDC)
- Webportal at http://icdc.zmaw.de
- Collection of selected, quality controlled data sets relevant for
research within Center of Excellence CliSAP/KlimaCampus
- Several data access possibilities: file system, http threads-server,
ftp-server, OPEnDAP
- Data visualisation with Life Access Server LAS
- Easy setup of user-groups to exchange results / prototypes
internally, if wanted with password protection
Titelmasterformat durch Klicken bearbeiten
04/10/23
Outline
• ESA Climate Change Initiative (CCI)
• ESA CCI Sea Ice
• ESA CCI Sea Ice and SMOS Sea Ice Thickness
ESA Climate Change Initiative (CCI) - I
Initiated by ESA because of the need for co-ordinated sustained
satellite observations of geophysical parameters that are key to
monitor & predict the Earths‘ climate system
Key drivers:
• ISCCP-Reports
• UN Framework Convention on Climate Change (UNFCCC)
• Global Climate Observating System (GCOS)
GCOS issued list of so-called Essential Climate Variables
(ECV)s, variables that are feasible to retrieve & have a high
impact according to UNFCCC requirements.
One of these ECVs: Sea Ice
ESA Climate Change Initiative (CCI) - II
Taken from presentation at ESA CCI Information Day in Oct. 2009
ESA Climate Change Initiative (CCI) - III
Tasks (within first 3 years):
• Requirement analysis, data product specification & error
characterization
• Algorithm intercomparison, validation & selection
• Prototyping system and global data products
• Product validation and user assessment
• (Operational) system specification
• Management
Titelmasterformat durch Klicken bearbeiten
04/10/23
Outline
• ESA Climate Change Initiative (CCI)
• ESA CCI Sea Ice
• ESA CCI Sea Ice and SMOS Sea Ice Thickness
ESA CCI Sea Ice - Overview
ESA CCI Sea Ice ECV project
Kick-off: December 2011
Duration: 3 years
Lead by: NERSC, Norway (Science) & Logica, U.K./Norway
Institutions: Norway: NERSC, met.no
Finland: FMI
U.K.: UCL, University of Cambridge
Denmark: DMI, DTU
France: IFREMER
Germany: MPI-M, University of Hamburg,
University of Bremen
ESA CCI Sea Ice – Breakdown of work
ESA CCI Sea Ice ECV project structure
ESA CCI Sea Ice - Parameters
Provide:
• Quality controlled, user assessed, validated sea ice
concentration (SIC) time series for 1979-today for both
hemispheres
• Quality controlled, user assessed, validated sea ice thickness
(SIT) time series for 1993-today for the Arctic
Do:
• Feasibility study about SIT retrieval in the Antarctic, including
update of current snow depth on Antarctic sea ice data set
ESA CCI Sea Ice – Key steps WP1
• User Requirements
• Product Specification
• Error Characterization
User consultation
• Questionnaire
• Documents (e.g. GCOS)
• Scientific articles
Review of input & validation data
• Technically feasible
• Temporally feasible
• Meets requirements
ESA CCI Sea Ice – Key steps WP2 / Round Robin
• Best algorithm(s)
combination
• Satellite data (for SIC & SIT
retrieval)
• Independent satellite & other
data for algorithm selection &
validation
Algorithms (SIC)
• NASA-Team
• Comiso-Bootstrap
• ASI
• OSI-SAF
• … many more
ESA CCI Sea Ice – Key steps WP3
• SIC & SIT ECV
prototype products
• ECV production
system prototype
• Best algorithm(s) combination
• Data required by the selected
approach
• Implementation of selected
approach
• Uncertainty estimation
• Generation of ECV prototype
product
• Test & validation of production
chain
ESA CCI Sea Ice – Key steps WP4
• Quality assessed SIC &
SIT ECV products
• Quantification of errors
• Identification of key
problem areas to be
improved in ESA-CCI
phase II
• Inter-comparison our products
with independent SIC & SIT
observations & trend analysis
• Long-term stability analysis of
our SIC & SIT product including
their uncertainties
• Usage of our SIC & SIT products
in numerical models & analysis
of potential improvement
• Inter-comparison of our products
with model results
Titelmasterformat durch Klicken bearbeiten
04/10/23
Outline
• ESA Climate Change Initiative (CCI)
• ESA CCI Sea Ice
• ESA CCI Sea Ice and SMOS Sea Ice Thickness
ESA CCI & SMOS - I
We learned today:
• Sea ice thickness (SIT) retrieval using SMOS is feasible
• SMOS SIT uncertainty can be described properly & is mainly a function of ice temperature & salinity& assumptions made for the retrieval
Therefore:
• SMOS SIT is an important addition to current and future (ESA-CCI) SIT data sets
• SMOS SIT fills gap at lower SIT range, where Cryosat-II & ICESat-I /-II fail or are likely to fail because of
i
)
observati
onal
limitation
s of the
sensors
i
i) sea ice
& snow
physics
ESA CCI & SMOS - II
SMOS SIT product does not yet meet ECV requirements:
• Validation still in baby shoes
• Time series too short
• Research stadium
BUT:
• Very valuable data set for Arctic SIT inter-comparison studies
within WP4
• Might turn out as the only data set able to capture Arctic ocean
fall freeze-up properly
YES, WE WOULD APPRIATE TO RECEIVE DATA:
• 50 km grid resolution // monthly // physically based
uncertainty estimates // RFI flags // SIC // IST // netCDF
ESA CCI Sea Ice – User questionnaire
A user questionnaire has been set up
• Which sea-ice parameters are how important for you?
• For sea ice concentration and sea ice thickness: What are your requirements [today & in the future] in terms of / how important is
-
Spatial-temporal resolution / Region / Time
period
-
Uncertainty budget (accuracy, precision,
long-term stability)
ESA CCI key element: Error characterizationS
IC 5%
5%
5% / decade
Representativity and sampling