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

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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

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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

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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