Seasonal Anomalies in the Sea Ice Concentration in the Ross Sea and Their Correlation to the Southern Annular Mode Kiley Yeakel 1, Joellen Russell 2, Paul.

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Presentation transcript:

Seasonal Anomalies in the Sea Ice Concentration in the Ross Sea and Their Correlation to the Southern Annular Mode Kiley Yeakel 1, Joellen Russell 2, Paul Goodman st Annual Arizona/NASA Statewide Space Grant Symposium April , 2012 Tucson, Arizona 1 Dept. of Chemical and Environmental Engineering, University of Arizona 2 Geosciences Dept., University of Arizona

Goals of this Study Develop a climatology for the Ross Sea Correlate mechanisms of sea ice formation/degradation with the Southern Annular Mode –Local winds –Surface water temperature Hypothesize on future conditions of sea ice in the Ross Sea

The Ross Sea Extensive permanent ice shelf extending from the southernmost part of the sea to 80° Latitude Relatively pristine sea Focus of environmental conservation groups Important habitant for marine species Study area (highlighted in right image): 140° E to 220° E 80° S to 65° S world-factbook/geos/ay.html

Climate of the Ross Sea and Antarctica Katabatic winds: Cold, dense air flows downslope off high topography at center of Antarctica towards the coast Circumpolar winds drive upwelling by Ekman transport

The Southern Annular Mode SAM is measure of the pole-ward shift and intensification of the circumpolar atmospheric low- pressure trough Toggweiler & Russell, 2008

The Southern Annular Mode High index SAM indicates an intensification and shift of the winds pole- ward Upward trend in SAM over past century due to climate change Stammerjohn et al., 2008

Methods Data Sources –Ice, local wind, and SST data obtained from the NCEP Climate Forecast System Reanalysis (CFSR) ( –Southern Annular Mode (SAM) data obtained from NOAA Climate Prediction Center ( ecip/CWlink/daily_ao_index/aao/aao.shtml) ( ecip/CWlink/daily_ao_index/aao/aao.shtml

Methods Hypothesized the sea ice concentration in the Ross Sea and all the factors linked to ice formation/degradation were strongly linked to the SAM –Created climatologies for the sea ice concentration, local winds, and SST Averaged all Januarys, Februarys, etc., for 30-year measuring period –Correlated these climatologies with the SAM index Performed lead/lag analysis

Average Sea Ice Concentration

Average Sea Ice Concentration

Average Sea Ice Concentration

Differences in Sea Ice Coverage (Late – Early)

Correlation of SAM with Ice Conc. (SAM leading by 1 month)

Correlation of SAM with Zonal Wind Anomaly

Correlation of SAM with Meridional Wind Anomaly

Correlation of SAM with Wind Speed Anomaly

Correlation of SAM with SST (SST leading by 1 month)

Areal Coverage by Ice in the Ross Sea There has been an upward trend in the sea ice concentration in the Ross Sea across all months.

Conclusions The Ross Sea is getting colder! High index SAM produces a conveyor belt of ice in the Ross Sea Increased ice growth is cause by advection of ice out of the Ross Sea by katabatic winds and Ekman transport Open water near coast is quickly frozen when contacted by cold, dense, katabatic winds

Acknowledgements Thank you to the Arizona/NASA Space Grant Consortium for funding this research. We also acknowledge the Data Support Section of the Computational and Information Systems Laboratory at the National Center for Atmospheric Research ( for providing access to the CFSR data.