Matlab code for reading PHC data addedPHC user Brita Irving kindly provided matlab code for reading PHC data: ReadPHCdata.m. A link to this program has been included on the data download page in the "PRODUCT AIDES" section.
Unrealistic Values in Fram Strait
The source of this problem is the WOA '98 fields which predominate in Fram Strait in PHC 3.0. Another issue introduced by the WOA '98 fields in Fram Strait occurs around latitude 75.5 as isolated anomalies at depth in all temperature fields. These isolated anomalies look like there was a single profile taken within the East Greenland Current and another within the Norwegian Atlantic Current. The WOA OI routine then creates isolated coastal anomalies, which would appear as boundary currents if there were more data within each of these currents. To make these currents more realistic would require obtaining more data and re-doing the OI in this region, a task we leave for the future!
The latest version of WOA (2005) represents Fram Strait a little more realistically than WOA '98. While the isolated temperature anomalies remain, they are not as severe, and the salinity issues in the monthly fields go away entirely.
PHC is therefore being updated to incorporate WOA '05, and should be available early in 2008. The problems in Bering Strait (posted 8/7/2006) will also be addressed in the new PHC 4.0 release.
Bad values discovered in Bering Strait
Some questionable values have been discovered in PHC 3.0 in Bering Strait, shown as blue dots on the plot to the right. The unrealistic data occur in the winter seasonal PHC 3.0 fields, and therefore in the monthly fields during Dec-May as well. The anomalies are higher than expected values in both salinity and temperature at depth. For more details about this problem, click on the plot.
This problem was brought to our attention by Dr. Marie-Noelle Houssais, for which we are very thankful.
PHC 3.0 is available in ODV format
Great thanks to Reiner Schlitzer for providing the following for PHC users!
The "Polar science center Hydrographic Climatology" (PHC3.0) of Steele, Morley, and Ermold (2005) is now available for download at
There are four collections containing the annual, summer, winter and monthly PHC data, respectively. The data are in ODV collection format and ready to be used by Ocean Data View.
PHC HAS BEEN UPDATED!
PHC 2.1 has been upgraded to PHC 3.0. This upgrade corrects the BUG identified on 2/4/2004, and also another a density instability problem that was brought to our attention by Jinlun Zhang of the Polar Science Center in Seattle, Washington. More details about these issues with PHC 2.1, and how we fixed them in PHC 3.0, can be found by clicking on the PHC 3.0 link on the Technical Details page of this report.
|3/1/04||The poisson solver program provided on the data page (fill_land.f) was modified to be a bit more user friendly toward PHC 2.1 data. Additional comments within the program were also provided to help the user know what lines to modify depending on the data being analyzed.|
|5/29/03||The site was rearranged in a couple of ways:
|5/21/03||The PHC 2.1 Detailed Report was posted in its entirety.|
|12/23/02||Most of this web site was posted, except for the "PHC 2.1 Detailed Report".|
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