Since 1988 oceanographic vehicles equipped with a variety of optical sensors have been deployed successfully from ships-of-opportunity in the North Sea as part of an environmental monitoring programme. The towed vehicles are deployed and recovered by the ship's crew and the instrument packages are activated automatically during the tow by electronic sea water switches. The vehicles carry sensors for measuring chlorophyll fluorescence, turbidity, conductivity, temperature, depth and upwelling and downwelling light in three wavebands; the measurements are stored in a solid state logger. The filters used in the irradiance sensors have wavelengths at 412, 450 and 550 nm with sensitivity at 0.1 pW cm2. The light measurements are used for the determination of the diffuse attenuation coefficient and the reflectance of blue light (R4l2, R450) and green light (R55O) and together with measurements of chlorophyll fluorescence are being used for the development of an algorithm for estimation of primary production in coastal waters and the open sea. Data are shown from a number of fixed-depth and variable-depth vehicle deployments from selected shipping routes in 1988/89, including a Copenhagen, Kattegat, Skagerrak, North Sea, Harwich route. From March 1990 a nutrient sensor measuring combined nitrite, nitrate in a continuous flow analyser will be carried by these towed vehicles.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Optical measurements from underwater-towed vehicles deployed from ships-of-opportunity in the North Sea


    Contributors:

    Conference:

    Environment and Pollution Measurement Sensors and Systems ; 1990 ; The Hague,Netherlands


    Published in:

    Publication date :

    1990-08-01





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Dynamics of towed underwater vehicles

    Strandhagen, A.G. / Thomas, C.F. | Engineering Index Backfile | 1963


    System for launching and recovering underwater vehicles, notably towed underwater vehicles

    SOREAU DIDIER / JEZEQUEL OLIVIER / JOURDAN MICHAEL | European Patent Office | 2015

    Free access

    SYSTEM FOR LAUNCHING AND RECOVERING UNDERWATER VEHICLES, NOTABLY TOWED UNDERWATER VEHICLES

    SOREAU DIDIER / JEZEQUEL OLIVIER / JOURDAN MICHAEL | European Patent Office | 2018

    Free access

    Optimized Autonomous Avoidance for Underwater Compact Towed Vehicles

    Al Nasser, Ali / Althuwaini, Yasser / Feron, Eric | IEEE | 2024


    Towed underwater vehicle

    LI BO / WANG PENGHAO | European Patent Office | 2015

    Free access