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Southern annular mode (SAM)

Santhosh Kumar 22/11/2023
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Southern annular mode (SAM) mind map Discovered by INCOIS Role Shaping sea conditions Indian Ocean Description North-south movement Southern westerly winds Timescales Decades to centuries Defined as pressure difference At 40°S and 65°S Importance Influences wave patterns Climate driver Affects rainfall and temperature Swell waves specifics Regular, longer period waves Generated by energy beneath surface Self-sustaining Key regions in Indian Ocean Extratropical southern Indian Ocean (ETSI) Tropical southern Indian Ocean (TSIO) Phases Positive SAM phase Anomalous air pressure distribution Effects on weather and wave activity Negative SAM phase Pressure and wind shifts Impact on wave heights Significance of SAM study Predict sea state windows Utilization by oil and shipping industries Aids in Coastal planning Resource management Disaster preparedness

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