CTD RELATIVE GEOSTROPHIC VELOCITY VS. ADCP VELOCITY

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Presentation transcript:

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

(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

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

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

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 1994. Seawater Matlab routines

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

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

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

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

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

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

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

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: -9.50 Sv LINE 70: +1.78 Sv LINE 77: +1.57 Sv ---------------------- TOTAL: -6.15 Sv (- = out of the box) TRANSPORT COMPUTED USING GEOSTROPHIC VELOCITY FIELD, RELATIVE TO THE 250 m ADCP VELOCITY

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

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

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

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

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

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

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

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