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

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

5. 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

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

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

13. Spatial survey
5.5 days
Across mouth of San Francisco Bay

15. 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

17. 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

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

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

20. Questions?