Results:

With several years of data collected and processed, we can now present timeseries of data at several of our study sites. St Paul has the longest timeseries taken off the North Dock at the mouth of the harbor. The shallow water was challenging for the CTDs we used and salinity was of variable quality so much of the early data were rejected. However, the annual cycle in temperature is quite strong compared to that of salinity, which roughly equals the surface salinity of the Bering Sea. The abrupt decrease in salinity in April 2017 corresponds to appearance of sea ice which had moved south (but not entered the harbor).

Time series of mean parameters measured by the ECO in St Paul, AK. Asterisks represent the vertical means and the lines are the ranges of values measured. Blue was measured by an YSI CastAway CTD and red was measured by an RBR Concerto CTD.

Old Harbor has a >2 year timeseries of data consistently taken at the same location. In Spring 2017, they switched from a YSI CastAway CTD to an RBR Concerto; time time also corresponds to a shift in oceanographic condtions characterized by colder/saltier water at depth. We beleive these changes are real and not due to the change in instrumentation because they began in January of that year, if not before. As sampling continues, it will be interesting to discover if this is a short-term feature or a regime shift.

Time series of mean parameters measured by Glen Clough in Old Harbor, AK. Asterisks represent the vertical means and the lines are the ranges of values measured. Blue was measured by an YSI CastAway CTD and red was measured by an RBR Concerto CTD.

Contour plot of CTD measurements in time and depth. Times of CTD casts are marked with black triangles.

In Spring 2017, Dr. Winsor gave a presentation on C2O2 at the Kodiak Area Marine Science Symposium 2017 (KAMSS) in Kodiak, AK. This presentation is available as a pdf and in a video recording of the live-stream (minutes 17:20-41:15). It summarizes the scientific backgound of the program and presents results from Old Harbor, AK.

The CTD data for the C2O2 program through October 2017 has been submitted to NPRB. Data for the three foundational communities (Kaktovik, St Paul, and Old Harbor) are available as a comma delimited ASCII data file, and those data plus profiles taken at Sitka are available as an extension of that data file. These data have had erroneous data removed and good data has been averaged into 1 m bins. The raw data have been removed from the website since these higher quality versions have been produced.

Eventually, these data will be available, with metadata, from the NPRB Project Page.

Sampling is expected to continue and more data will be provided as it is processed.