Chl-a beneficial concentrations through the springtime and you will summer be a little more than 3 x the ones from the latest slide survey, Three Day Rule that have a maximum value during the summer. The newest depth of your own DCM including expands year round (minimal for the springtime and you may limitation on the slip). If you find yourself the depth matches the brand new breadth of the pycnocline in summer, the brand new DCM was shallower compared to the pycnocline within the spring and you can better inside the slide. You should keep in mind you to Chl-an excellent levels were not calibrated facing inside the situ phytoplankton collection. Density reported listed below are also quite above the climatological viewpoints said from inside the books (e.grams., Lavigne ainsi que al., dos015).
Humic-like and Backscattering measurements (Figures 6, 9g,h) are presented as they are standard measurements on gliders. However, although meaningful for understanding biogeochemical dynamics in the NW Mediterranean, their extensive analysis is beyond the scope of this study. Only observations relevant for the discussion made in Section 4 are presented. The fall campaign was realized after important rain events. This campaign is marked by more turbid water (high backscattering) close to the shore (Figures 6h, 9h), with the exception of the subsurface lower salinity layer discussed above (Figures 6b, 9b), which is associated with relatively “clear” (low backscattering) water. Offshore, the depth of the DCM matches the depth of maximum backscattering relatively well for all three seasons. However, the depth of the DCM only matches humic-like peak during the summer and fall. In spring, the slight decrease in humic-like in the 75–200 m range corresponds to the submesoscale feature observed in previous subsection (decrease in SA beneficial and increase in O2).
4. Conversation
Comparison anywhere between Chl-a and you may Trp-eg specifications (Rates 9d,e) shows that one another tracers do not have the same seasonal figure. Including, when you’re Chl-an effective levels are apparently secure anywhere between spring season and you will june, Trp-eg concentrations is increased around because of the a very important factor step 3. Also, whenever you are Chl-a beneficial density are split because of the step 3 amongst the spring season therefore the slide, Trp-such as for example concentrations is higher when you look at the fall. Also, the fresh straight position out of Trp-eg highs is always shallower compared to the highs into the Chl-an excellent. This huge difference try 4 m when you look at the springtime and june, and you will ten meters throughout the slip (discover Table step three). Aforementioned height into the Trp-such as fluorescence is also better than just for the spring otherwise summer attacks. During the summer and you can slip, the fresh DCM fits relatively better the career of foot out of the pycnocline, while in spring season it is so much more shallower (Table step three).
Table 3. Position of maximum subsurface Chl-a (zchl) and Trp-like (ztrp) concentrations in relation to the position of the center of the pycnocline (zpyc) and its base (zbase).
As Phe-instance levels mimic relatively better those of Trp-as with the fresh overseas part for everyone 12 months (Shape nine), their personality is actually contrasted when you look at the belong the fresh new near-coast part. In fact, Phe-such as levels was apparently highest near the coastline given that Trp-such of these try as an alternative lower (Figures 6e,f). The fresh cousin continuity off Phe-such attention regarding side when you look at the Profile 6f implies an accumulation of of PAH below the fresh pycnocline, approximately an identical concentration in coastal and you may overseas waters. It behavior is quite not the same as others biogeochemical tracers one to mainly showcase hitting differences between each party of your own top.
cuatro.1. Believe into the MiniFluo Specifications
One limit to the study is the cousin lack of hindsight to the MiniFluo technology. Such as for example, fine tuning improvements were made involving the additional campaigns presented right here (elizabeth.g., keeping track of point changes anywhere between MiniFluo #05 and you may #14 and you will optical limit changes between springtime and you may summer 2016 missions). While the size grounds and empty values was modified between such missions, the brand new repetition of your own dimensions which have one setup over of many decades perform let identifying if a person a portion of the laws is due to instrumental alter. Because cousin coherence in the amount range observed from a single promotion to another is reassuring, distinct h2o products in the course of glider deployment and you will/or recovery would improve the depend on from the specifications. Bootstrap investigation to your scale things ways a maximum mistake into dimension off 7% for the Trp and you can 10% into Phe (WAF calibration) having MiniFluo#14, and you can correspondingly 50 and you may 33% which have MiniFluo#05. It’s likely that the change of overseeing point between your several MiniFluo generation has lead to a decrease in new calibration error.