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INPOC

Table of Contents

Tracks and dates for INPOC cruises

Fig.1 Tracks of INPOC cruises (from Dave Musgrave)

CTD data

The CTD data for inpoc cruises and corresponding linep cruises is located on bee in /data/ocean/inpoc under corresponding year in the directory ctd. The LINEP data for the corresponding years are stored in the same directories. Some of the LINEP CTD data had problems with missing pressures levels . In such cases the data were corrected and put in new ctd files. Corrected data were used when converting to the netcdf format.

Dave Musgrave sent the preliminary offsets for deep salinity measurements (500-3000db) for Fall 92 and Spring 93. For west-east crossections the new salinites and and densities (sigma 0) were added to netcdf files. New transports for Fall 92 and Spring 93 with corrected salinities were calculated. Seems that in Spring 93 the change of sign for the offset for the station 49 (50N, 178E) influenced transport creating an eddy near the dateline. This station needs to be checked.

Comparison with Levitus climatology

91-93 cruises data seem to be colder then Levitus climatology . The same is true for the 1985 T47 cruise. Figure comparison shows temperature profiles for latitudes 160-170, 170-180,180-190 , during August and September at 47 S. Thick red line denotes Levitus climatology, thick blue line - T47 cruise. The thin lines indicate the results form "Hydrobase" bottle data form 166-1995 for August and September. The color of the thin lines denotes the distance from the western corner (closer are blue farther are red) .

50N vertical sections.

Properties (salinity, potential temperature, density) on pressure surfaces

Netcdf data

The data for the east-west crossection is gathered in netcdf files on /bee/data/ocean/inpcoc.For each cruise the INPOC data is combined with the data from LINEPcruises (if LINEP was available for this year. The station numbers and location, dates, maximum depth for each station are shown in : fall91.tab, spring92.tab, fall92.tab and spring93.tab.The organization of data within netcdf data files on the example of Fall91 is shown in netdump. The netcdf files contain data from ctd files plus some calculated properties (density, potential temperature, dynamic height).If preliminary conductivity offsets are available the calibrated data and densities are added to a file

Properties.

We plotted salinities and temperatures on sigma surfaces for Fall91, Spring92, Fall92, and Spring93 cruises. The data used in these plots is unsmoothed and uncalibrated. IDL contouring routine was used to interpolate the data from pressure to sigma surfaces. Levitus climatology is shown for comparison.

Transports

The transports for the east-west crossections were calculated by integrating the velocities from the eastern shore (like in Sverdrup transports). The figures show transports on pressure surfaces and transports on sigma surfaces.

Meridional (160 W) crossections

Properties (potential temperature, salinity density) on pressure surfaces (from Lynne Telley)

Properties

As for 50N crossections, salinities and temperatures on sigma surfaces for Fall91 (this is at 155W), Fall 92, Spring 92, and Spring 93 cruises are plotted from the usmoothed and uncalibrated data . Levitus climatology is shown for comparison.

Also: Temperatures sigma surfaces plotted with .5 degree resolution are shown for Fall 91, Spring 92, Fall 92, and Spring 93 . Since IDL can draw only 29 contours I cut higer temperatures (they appear black on the plot) so the minimum is can be seen better.

Transports

The transports for the north-south crossections were clculated by integrating velocities from north to south. Figures show transports on sigma surfaces. and transports on pressure surfaces

Transports in 1500 layer

Transport in upper 1500 db were calculated for 50N and 160W sections using the reference velocity at 1500db and 2000db (where possible). These transports are now available for:

Diagonal crossections

Properties

Salinites an temperatures on sigma surfaces are plotted for Fall92, Spring 92 and Spring 93.

Comparison of transports for calibrated and uncalibrated data.

Calibrated data are available for Spring 93 and Fal 92 cruises, from Dave Musgrave. For these cruises the transports in 1500 db deep layer were calculated and compared with similar transports from uncalibrated data. It seems that calibration did not singificantly changed transports except for one case in 1993 (leg 1 in "diagonal" part of the cruise) where calibration removed a large peak in transport. The eddy in present in calibrated meridional transport (along 50n) is probably a mistake (station 57 way off ). The figures are shown below.

Comparisons of transport on 4 sigma layers

Below are the zonal an meridional transports in the following sigma layers: surface to 26.2, 26.2 to 26.7, 26.7 to 27.0, 27.0 to 27.3.

Transports for T47 :

Transports for INPOC cruises

The same as above but with a new program for transport on sigma surfaces (with the depth of a sigma layer averaged between two stations)

Transports for T47 :

Transports for INPOC cruises

ECMWF atmospheric data

other (non-INPOC) oceanography stuff (has Sverdrup transport at 30S )