Notice of Incomplete or Altered Data:
The data available here is only a five-year (1995-1999) subset of the considerably larger SAHFOS database that runs 60+ years. The data available here has additionally been hobbled to contain only every third data record present in the original database. Access to the full SAHFOS database is controlled by SAHFOS directly. Potential data users are encouraged to contact SAHFOS directly with all inquiries ( http://SAHFOS.org ).
Comparison of CPR data with other COPEPOD data sets:
The CPR is a small mouth-opening, high tow speed, surface-only sampling device. Zooplankton and phytoplankton together are captured using a 270 um mesh net. Each sample represents plankton collected over a 10 nautical mile horizontal section of water.
- Data users are urged to take great caution before quantitatively comparing CPR-collected zooplankton with other COPEPOD zooplankton data sets sampled by larger mouth, depth-to-surface vertical or oblique net tows.
- Data users are urged to take great caution before qualitatively or quantitatively comparing CPR-collected phytoplankton data (caught at highspeed on a 270 um mesh net) with other COPEPOD phytoplankton data sets sampled more gently with finer mesh nets or bottles.
A good introduction to the CPR instrument, methods, and data inter-comparability is available in Batten et al. (2003).
Batten, S.D. and Clarke, R. and Flinkman, J. and Hays, G. and John, E. and John, A.W.G. and Jonas, T.D. and Lindley, J.A. and Stevens, D. and Walne, A. (2003) CPR sampling: the technical background, materials and methods, and issues of consistency and comparability. Progress in Oceanography, 58. pp. 193-215. ISSN 0079-6611
A PDF of this reference is linked and available via the SAHFOS data web page (click here).