Hydrographic data (CTD and discrete bottle data: oxygen, salinity and nutrients) from WOCE Hydrographic Program and other selected long sections were gridded using a modified version of Roemmich's method for mapping hydrographic station data. Grid resolutions are either 20 km x 10 meters (fine) or 20 km x 40 meters (coarse).
NEW: a program for interpolating to latitudes or longitudes from the distance grids, and decimating vertically is now available. The program is called grid_interp and software and a makefile can be obtained in the programs directory.
Downloading the postscript files: if your web browser attempts to plot the postscript files and you want to save them instead, instructions for netscape are: click with the 3rd right mouse button instead of the leftmost one and answer the dialog question.
Gridded files and plots of the bottle data (oxygen, silicate, nitrate and phosphate) are gradually being added.
The public data sets in WOCE format are available through the
Other CTD and hydrographic data sets are also available on
the
nemo data server at SIO.
Line | Location | Chief Scientist |
---|---|---|
P01W | Okhotsk Sea | Freeland/Wong |
P1_TPS47 | 47 N | Talley/Joyce |
P3_TPS24 | 24 N | Roemmich/Swift/Bryden |
P4_TPS10 | 10 N | Toole |
TEW | 12 S | Hayes/Taft |
P21* | 17 S | McCartney |
P6 | 32 S | Bryden/McCartney/Toole |
P17E | 54 S | Swift/Talley |
S4 | 67 S | Swift |
Line | Location | Chief Scientist |
---|---|---|
P10 | 149 E | Hall/Joyce |
P11A* | 155 E | Rintoul |
P14 | 178 E | Roden/Roemmich |
P15N | 165 E | Freeland |
P16 | 152 W | Reid/Swift/Talley |
P17 | 135 W | Swift/Tsuchiya/Musgrave |
P18 | 110 W | Johnson |
P19 | 88 W | Swift/Talley |
Gridded data files are located on an anonymous ftp site. At present, the gridded data files are available at two resolutions: 20 km by 10 meters and 20 km by 40 meters. Distance is measured along the section starting at the first station. A separate ascii file with the station locations and bottom depths accompanies each gridded file. The gridded files are binary format; a fortran program to read them is available.
Plots are available online in gif format; postscript versions can also be downloaded. BUG: as of 8/15/96, the maximum length for the plots is 14000 km, so some sections are missing the eastern or northern end or are in black and white. (Affected sections are: TPS10, TEW, P21, and P17.) The gridded files go completely to the coast on each end - they are not missing any positions.
WOCE Hydrographic Programme Office
WOCE Data Information Unit hydrographic data page
WHP Special Analysis Centre
nemo WHP SAC mirror site at SIO
U.S. WOCE Homepage
nemo oceanographic data server at SIO
Scripps Institution of Oceanography local servicees
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Oxygen (umol/kg) | Y | Y | N | Y |
Silicate (umol/kg) | Y | Y | N | Y |
Nitrate (umol/kg) | Y | Y | N | Y |
Phosphate (umol/kg) | Y | Y | N | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
47N station and bottle position information files
(latitude/longitude, distance along the section, and bottle
positions of good data for each station).
P1_TPS47 flat ascii bottle data file
Click here
for instructions on format and fortran programs for reading the
header information and data and writing them in ascii.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
The plots (but not the gridded files) are truncated at the eastern end
because of a plotting problem associated with the great length of
the sections.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | N | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
The plots (but not the gridded files) are truncated at the eastern end
because of a plotting problem associated with the great length of
the sections.
P21 data are proprietary and not included in this release, although
sections are available with permission of the principal investigator.
Back to table of contents
P21 (17S)
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | N | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
P10 (149E)
P10 station track plot (postscript file)
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
P11A station information files
(latitude/longitude and distance along the section for each station).
Note: all gridded files are binary.
P11A (155E)
P11A data are proprietary and not generally available to the public;
plots and data files are not included here.
Release is available only with permission from the principal
investigator.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | N | N |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | N | N |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Oxygen (ml/l) | Y | Y | Y | N |
Silicate | Y | Y | Y | N |
Nitrate | Y | Y | Y | N |
Phosphate | Y | Y | Y | N |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
These plots are in black and white because of a plotting program
associated with the great length of the section.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
Property | gif plot | postscript file | 20x40 grid | 20x10 grid |
---|---|---|---|---|
Temperature | N | N | Y | Y |
Potential temperature | Y | Y | Y | Y |
Salinity | Y | Y | Y | Y |
Potential density (0) | Y | Y | Y | Y |
Potential density (2000) | Y | Y | Y | Y |
Potential density (4000) | Y | Y | Y | Y |
Neutral density (McDougall) | Y | Y | Y | Y |
Error map | N | N | Y | Y |
Note: all gridded files are binary.
Click here
for instructions on format and fortran programs for reading the
header information and data.
It is assumed that the chief scientist chose appropriate horizontal sampling,
with tighter spacing across regions of strong gradients.
CTD and discrete data are mapped differently to account for the sampling
differences. The same decay scale and horizontal/vertical scale ratio
are used for both.
CTD data: The 2 dbar profiles are first smoothed vertically with a
Gaussian with half-width 10 dbar. Data are used from 6 stations at a
time, and 6 depths. The mean which is removed is just that of this
small rectangle.
Discrete bottle data: Data from 6 stations are used at one time. An
Akima cubic spline is fit to the deepest station of the group, and this
profile is removed from all stations in the group as a representation of
the mean for the group. The residuals are then mapped and the mean
added back in.
The programs for gridding the data are available from
Lynne Talley (ltalley@ucsd.edu).
Methods
Gridding
The original station data were either CTD profiles, mostly at 2 dbar
intervals, or discrete bottle data, with up to 36 bottles per station.
The data were objectively mapped using Roemmich's (1983) method adapted
for producing sections which subjectively were most like those which are
hand contoured, and hence smoothed somewhat by eye.
Potential density calculations
The potential densities calculated
relative to 0, 2000 and 4000 dbar use potential temperature referenced
to these pressures and then density referenced to these pressures,
respectively. The McDougall neutral density parameter is also used.
References
Jackett, D. R. and T. J. McDougall, 1996. A
neutral density variabile for the world's oceans. J. Phys. Oceanogr., submitted.
Roemmich, D., 1983. Optimal estimation of hydrographic
station data and derived fields. J. Phys. Oceanogr., 13, 1544-1545.
Back to Vertical Sections Index
Lynne D. Talley, ltalley@ucsd.edu