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Deployment and recovering of Argo floats summer 2022

In 2022, 13 new Argo floats were deployed in the Nordic Seas during a cruise with R/V Johan Hjort in May/June with Henrik Søiland (IMR) as cruise leader.

The cruise track with the locations of the Argo float deployments is shown in Figure 1.

map with markings
Figure 1. Cruise track and deployment locations of Argo floats. The large dots indicate locations of Argo float deployments with different colors for the different float types (see table 1).

 

The deployed Argo floats were different float types: 4 BGC (Provor CTS4), 2 Bio (Provor CTS4), 3 Deep (Deep Arvor), and 4 core (Arvor) floats. One of the core floats also includes oxygen sensor. Table 1 shows the sensors that are attached on the floats for each float type.  

 
tabell
Table 1. Float types


At each deployment location a CTD-station was taken with water samples for analysis of salinity, nutrients, oxygen (analyzed on board), chlorophyll-a, pH and Particulate Organic Carbon (POC) for comparison with Argo data.

two persons launching equiptment
 Picture. Deployment of an Argo float from the vessel

Recovering of an Argo float

One BGC-float (WMO 6903549) was recovered on the cruise. The Argo float has performed 230 profiles and has operated for more than three years (Figure 2). The float is now sent to the manufacturer for service and battery shift.

 
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Figure 2. The drift of the recovered Argo float. Large green dot is the deployment location (21 May 2019) and large red dot is the last profile location (13 June 2022) before it was recovered on 14 June 2022. The numbers are profile numbers.


 
sea and fishnet
Picture. Argo catcher net ready for recovery. Photo: Henrik Søiland (IMR).
 
fishnet with going into sea
Picture. Argo float hauled on to deck. Photo: Henrik Søiland (IMR).

NorArgo status

With the new Argo float deployments, Argo Norway (NorArgo) has at present (5. September 2022) 47 operative Argo floats. The locations of the Norwegian and other countries operative floats in the Nordic Seas and Barents Sea are shown in figure 3. 

 
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Figure 3. Operative Argo floats in the Nordic Seas and Barents Sea. Red colors: NorArgo floats. The tail is 2 months drift. 

 

Daily updated information of Argo float locations and profiles within the Nordic Seas can be viewed on the NorArgo operational web site.