1. CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
CRUISE DATA ANALYSIS:
CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
Juan Conforto
Summer 2003

2. (California Cooperative Oceanic Fisheries Investigation)
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
CRUISE BOX:
CalCOFI CenCal Box
(California Cooperative Oceanic Fisheries Investigation)
LINE 67
LINE 70
LINE 77

3. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

4. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
Temperature Field
Salinity Field
Geopotential Anomaly Field

5. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
The geostrophic velocity at one level V1 relative to a lower level V2 between two stations denoted by A and B is estimated by
where d is the distance between stations and the geopotential anomaly (DF) is the integral of the specific anomaly (d),
If we traverse the section from station A to station B, a positive velocity is directed to the left of the path, whereas a negative velocity is directed to the right.
CSIRO, Phil Morgan Seawater Matlab routines

6. 1000 db is the level of no motion
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
1000 db is the level of no motion

7. VERY LARGE DIFFERENCES
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
CTD
WILL COMPUTE CTD VELOCITY FIELD AGAIN USING ADCP 250 m VELOCITY AS REFERENCE
ADCP
VERY LARGE DIFFERENCES
CTD-ADCP

8. EXCEPT FOR THE SURFACE PORTION.
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
CTD
EXCEPT FOR THE SURFACE PORTION.
The reason for this:
- Wind driven (Ekman) motion
ADCP
- Tidal currents
CTD-ADCP
NOW THE DIFFERENCES ARE CLOSER TO ZERO

9. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
NOAA-17
SST

10. TOPEX Mesoscale Altimetry
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
TOPEX Mesoscale Altimetry
Colorado Center for Astrodynamics Reserach (CCAR)

11. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

12. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

13. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
1.57 Sv
1.78 Sv
-9.50 Sv
TOTAL TRANSPORT:
LINE 67: Sv
LINE 70: Sv
LINE 77: Sv
TOTAL: Sv
(- = out of the box)
TRANSPORT COMPUTED
USING GEOSTROPHIC
VELOCITY FIELD,
RELATIVE TO THE 250 m
ADCP VELOCITY

14. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
POLEWARD FLOW
CALIFORNIA UNDERCURRENT

15. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

16. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
POLEWARD FLOW

17. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

18. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY
There is indication of seawater flow entering the box below 1000m

19. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

20. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

21. OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS
OC3570 CRUISE DATA ANALYSIS: CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY