NIOZ: Royal Netherlands Institute for Sea Analysis
On board of the RV SONNE, we’ve put in a pH optode taking steady measurements at 30 seconds interval inside a cell by way of which floor seawater runs uninterrupted (Determine 1). This permits us to acquire excessive decision pH information, which is uncommon even for the North Atlantic Ocean. Measuring parameters of the carbonate system not solely sheds some mild on the absorption of our CO2 emissions by the oceans, but in addition on their correlation with different problematic subjects corresponding to microplastics. If microplastics have an effect on organic exercise, then in addition they not directly have an effect on the oceans’ carbon cycle!
From this collection of steady pH measurements, we are going to attempt to match pH values with discrete samples taken instantly from the pH cell (higher left panel, Determine 1) twice a day, in an effort to confirm that the continual measurements match identified values of pH at completely different time limits. These discrete samples additionally embrace measurements of Si, and PO4 NH4, NO3 and NO2, which can give extra data relating to the conduct of organic exercise within the floor waters. Discrete seawater samples have been additionally taken at every station to higher constrain the water column, typically all the best way right down to 5000 m water depth (Determine 2).
SO279 additionally encountered troublesome climate on a number of events all through the cruise. Often, the opposite approach of getting excessive decision pH information is from satellites – nonetheless, given satellite tv for pc information is unusable throughout heavy cloud cowl, we hope this new pH dataset will give some extra insights on pH variations throughout storms. Storm could cause violent turbulences within the floor waters, that are normally well-mixed and micro-bubbles typically kind because of this, as could be seen in Determine 3. Air bubbles usually considerably have an effect on the ensuing pH due to the CO2 current in these bubbles. Thus, one problem right here might be to point out that these bubbles are literally a part of the pattern itself, given they’re a direct affect of the storm and never the ship’s underway system pumps.
by Louise Delaigue, Royal Netherlands Institute for Sea Analysis (NIOZ)