CTD SVP’s Compared to GDEM LT Nick A. Vares OC 3570 SUMMER 2001

Overview NAVO data Gulf of the Farallones NAVO generated GDEM Variations in time and space of SVP’s Actual vs model SVP’s

Motivation SVP data important input for mine and submarine acoustic detection models GDEM is a good starting point Actual SVP data required for effective tactical actions

Station 1 26-hour T/S Greatest mixed layer variation Surface heating causes mixed layer shallowing Surface cooling causes mixed layer deepening

Station 2 26-hour T/S Mixed layer below 20 meters Small mixed layer variation Higher surface temperatures

Spatial survey 5.5 days Across mouth of San Francisco Bay

GDEM Climatology of 70 years data Half degree resolution for majority of globe Better resolution for hot spots Master Oceanographic Observation Data Set Naval Interactive Data Analysis System

Conclusions Diurnal shallowing and deepening of mixed layer GDEM is an average Averages seldom match single samples Means similar in shape and velocities Standard deviation greatest in upper 50 meters

Station 1 – Blue Station 2 – Green Spatial Survey – Magenta

Station 1 – Blue Station 2 – Green Spatial Survey – Magenta

Questions?