GTSPP Subsurface Temperature and Isotherm Depth

The plots in this data group are of monthly means of MEDS (Canada's Marine Environmental Data Service) subsurface temperature observations which are received from NODC (NOAA's National Oceanographic Data Center) by PFEL. The temperature data have been averaged on a 1 degree latitude/longitude grid and interpolated to 19 standard depth levels. The interpolation procedure to produce isotherm depth is a simple linear interpolation which begins at the surface.

Real-Time GTSPP - These data are received monthly and are are posted to this site around the middle of the month following the month of observation.

Best Copy GTSPP - NODC receives higher resolution delayed-mode data which often duplicates or supercedes real-time profiles. The Best Copy data provide the most complete dataset, however the real-time data is updated more frequently.

For more information about these data and the quality control performed on them, please see the GTSPP home page.

Note: In the isotherm depth plots, areas of light pink shading indicate that the mean surface temperature in a 1-degree box is less than the isotherm temperature. Gray shading indicates that the isotherm temperature is less than the mean temperature for deepest depth level in the 1-degree box. In this case, the isotherm depth is not necessarily greater than 1000 m (even though the color key would indicate that it is) because observations are not necessarily present for all levels for all 1-degree boxes.