1	Seasonal and Interannual Variations in Hydrographic Distributions in Marguerite Bay and Environs
2	Outline of Presentation Show thermohaline properties from 2002 cruises Describe circulation from 2002 cruises Compare 2002 patterns with those from 2001 cruises Preliminary estimates of exchange Summary of circulation characteristics
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17	Change in Heat Content For 2001 cruises – heat content in upper waters was negative and in deeper waters was positive Indicates a net heat loss from surface Heat source in bottom waters – CDW Difference between two cruises was negative over entire water column (-0.000342 J/m3/day) - mostly from surface cooling Little difference in bottom water heat content between two cruises – suggests continual input of warm water
18	Summary Multiple pathways for CDW to get onto shelf at depth See effect of warm deep water in surface Appears to be gyre circulation in northern part of study region Inshore coastal current seen in 2001 not as apparent in 2002
19	Future Work Calculate heat change from all cruises Calculate volume change of warm and cool water between cruises – flushing rates/turnover times for shelf Heating/cooling differences over the study area may show regions of polynya formation Calculate the contribution of Lower CDW to warm water on shelf Topographic mixing effects on breaching of Winter Water layer