6/9/2010Monarch-A, Hamburg, H. Skourup1DTU Space, Technical University of Denmark WP 2.6 Improved estimate sea ice fluxes and the freshwater cycle in the.

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Presentation transcript:

6/9/2010Monarch-A, Hamburg, H. Skourup1DTU Space, Technical University of Denmark WP 2.6 Improved estimate sea ice fluxes and the freshwater cycle in the Arctic D 2.6.1: Sea ice Thickness and SSH based on ICESat – month 18 D 2.6.2: Ice volume flux through Fram Strait, Nares and Bering Strait based on ice thickness and drift - month 18 D Computed time series of GRACE signals from freshwater flux pulses and compared to satellite data - month 36 D Freshwater flux time series grids for the Arctic Ocean based on modelled Greenland fresh water output (WP 2.3), river discharge (WP 1.2) and sea ice flux and melt (WP 2.6) - month 18 MONTH 18 = end of August 2011

6/9/2010Monarch-A, Hamburg, H. Skourup2DTU Space, Technical University of Denmark Sea ice freeboard heights Sea ice freeboard heights and dynamic topography of the Arctic Ocean observed from ICESat altimetry release 28 are available in grids of resolution 0.1°x0.2° ICESat freeboard heights October 2005 blue: February – March green: October - November

6/9/2010Monarch-A, Hamburg, H. Skourup3DTU Space, Technical University of Denmark Conversion of freeboard to thickness Conversion of measured sea ice freeboard heights (h f ) into ice thicknesses (t ice ) depends on: - Snowdepth - Density of the ice, water and snow Wadhams et al, 1992 Recent studies suggest to use a R = for conversion of ICESat freeboard heights into thicknesses. The study is based co- incident measurements of draft by AUV and freeboard by airborne laser Doble et al. 2011, JGR SEDNA, submitted

6/9/2010Monarch-A, Hamburg, H. Skourup4DTU Space, Technical University of Denmark First results of CryoSat-2 STINE results CryoSat-2

6/9/2010Monarch-A, Hamburg, H. Skourup5DTU Space, Technical University of Denmark ESA CryoVEx 2011: underflight of CryoSat-2 Photo by Jóhannes Stefánsson Credits:

6/9/2010Monarch-A, Hamburg, H. Skourup6DTU Space, Technical University of Denmark CryoVEx 2011: DTU Space airborne activities EGIG-line Austfonna Devon Alert Charter Norlandair Twin Otter: April 7 - May 10, 2011 April 7 – 8 Installation and test flight Kangerlussuaq April 10 – 19 CryoVEx (sea ice program Alert) April 20 – 25 PROMICE (Southern Greenland) April 26 – May 6 CryoVEx (EGIG-line, Austfonna ice cap, sea ice work from RV Lance north of Svalbard, Devon ice cap) May 7 – 8 Spare/Dismount of instruments

6/9/2010Monarch-A, Hamburg, H. Skourup7DTU Space, Technical University of Denmark Noget om GRACE... Indridi ?!?

6/9/2010Monarch-A, Hamburg, H. Skourup8DTU Space, Technical University of Denmark WP 2.6: Status and questions Lead beneficiary: DTU Space D 2.6.1: Time series grids of sea ice thickness, and improved SSH measurements, (for the 3-yearly laser periods), with comparisons to selected ocean models and field-calibrated satellite data This deliverable is almost ready Lead beneficiary: NERSC D 2.6.2: Ice volume flux time series across the Fram Strait and other outlets (Bering Strait, Nares Strait) based on satellite data (2003-) To solve this we need ice thicknesses and ice drift. DTU Space has the ice thickness fields from D 2.6.1, do NERSC have ice drift ? More important who will actually calculate the flux rates, DTU Space or NERSC ?

6/9/2010Monarch-A, Hamburg, H. Skourup9DTU Space, Technical University of Denmark WP 2.6: Status and questions - continued Lead beneficiary: NERSC D 2.6.3: Freshwater flux time series grids for the Arctic Ocean based on: Modeled Greenland freshwater output River discharge sea ice flux sea ice melt Who will provide the modeled freshwater output from the Greenland ice sheet ? Who will provide the river discharge ? We already have the sea ice flux from D Who will provide an estimate of the sea ice melt ? Is this provided from the model of University of Hamburg ? Last but not the least we need to agree on data format and grid definitions.