Sea Ice Metrics in CMIP5
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1 Sea Ice Metrics in CMIP5 Detelina Ivanova (PCMDI,LLNL) CESM, Breckenridge, 2012
2 Acknowledgements Program for Climate Models Diagnostics and Intercomparison Funding agency - DOE
3 Motivation/Goals Follow up the Kay & de Boyer & Hunke discussion On the observational needs for climate models in polar regions ; Need to build up NOW an observational based metrics to evaluate sea ice solutions in CMIP5; Goal to identify a subset of the most essential sea ice variables with available robust observational records.
4 Scientific question Uncertainty in the Sea Ice Volume = Sea Ice Area x Sea Ice Thickness - The latest IPCC (2007) reported that the Arctic sea ice volume decline will exceed twice the sea ice extent rates by the end of 21century; - Schweiger et al., 2011 based on available observations and PIOMAS estimated -2.8 ± km 3 /decade Arctic sea ice volume decline.
5 Outlines CMIP5 status Sea Ice Observational Data Sets Ice Concentration Ice Thickness Fram Strait Ice Export Ice Drift
6 CMIP5 Status PCMDI: BADC: DKRZ: NCI:
7 Sea Ice Concentration (NSIDC- NASATEAM - Cavalieri, D., C. Parkinson, P. Gloersen, and H. J. Zwally. 1996, updated yearly. Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I- SSMIS Passive Microwave Data, [list dates used]. Boulder, Colorado USA: National Snow and Ice Data Center. Digital media. BOOTSTRAP - Comiso, J. 1999, updated Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I, [list dates you used]. Boulder, Colorado USA: National Snow and Ice Data Center. Digital media.
![Total Sea Ice Area [km 2 ] for 1979-2005 period.](/docs-images/96/128742058/images/8-0.jpg "CMIP5 compared to the NASATEAM and Bootstrap SSM/I")
8 Total Sea Ice Area [km 2 ] for period. CMIP5 compared to the NASATEAM and Bootstrap SSM/I observations.
9 Total Sea Ice Area [km 2 ] Annual Cycle. Monthly Climatology for period.
![Total Sea Ice Area [km 2 ]](/docs-images/96/128742058/images/10-0.jpg "Anomaly.")
10 Total Sea Ice Area [km 2 ] Anomaly. Mean and Annual cycle removed.
11 SSM/I Sea Ice Concentration
12 Arctic Sea Ice Concentration (%) Winter (DJF) climatology for period.
13 Antarctic Sea Ice Concentration (%) Winter (JJA) climatology for period.
14 ICESat Arctic Sea Ice Thickness Kwok, R., G. F. Cunningham, M. Wensnahan, I. Rigor, H. J. Zwally, and D. Yi (2009), Thinning and volume loss of the Arctic Ocean sea ice cover: , J. Geophys. Res., 114, C07005, doi: /2009jc Kwok, R. (2011), Observational assessment of Arctic Ocean sea ice motion, export, and thickness in CMIP3 climate simulations, J. Geophys. Res., 116, C00D05, doi: /2011jc
15 Arctic Sea Ice Thickness [m]. Mean Oct+Nov+March+April fields for period.
16 Antarctic Sea Ice Processes and Climate (ASPeCt) Sea Ice Thickness 23,373 Ship-based observations for period; Worby, A. P., C. A. Geiger, M. J. Paget, M. L. Van Woert, S. F. Ackley, and T. L. DeLiberty (2008), Thickness distribution of Antarctic sea ice, J. Geophys. Res., 113, C05S92, doi: /2007jc
17 Antarctic Sea Ice Thickness [m] Annual fields for the period
18 Future plans Fram Strait Ice Export: - Vinje et al., 1998, 2001: Vinje, T., N. Nordlund and A. Kvambekk (1998), Monitoring ice thickness in Fram Strait, J. Geophys. Res., 103, 10,437-10, Kwok, 1999, 2004 : Kwok, R., and D.A. Rothrock (1999), Variability of Fram Strait ice flux and North Atlantic Oscillation, J. Geophys. Res., 104(C3), Kwok, R., G.F. Cunningham, and S.S. Pang (2004), Fram Strait sea ice outflow, J. Geophys. Res., 109, C01009, doi: /2003jc Sea Ice Drift (NSIDC): - IAPB Arctic - IPAB - Antarctic
19 Suggestions? Other observational data sets which can be used as first order metrics for sea ice?
20 Thank you!
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