Advances in Sea-State Forecasting using Chelsea Sensor
Marine operations such as offshore oil and gas operations, renewable energy projects and shipping depend on high quality information on sea-state (wave height, period, direction, steepness) for economic and safety decision making. The information currently available is based on atmospheric/ocean models and lacks sufficient temporal and spatial resolution.
“Wave conditions are always changing and can vary tremendously over a period of a few hours”, said Chelsea’s Technical Manager, Paul Bolton. “Operators need to know what current conditions are before commencing an operation or lives could be put at risk”.
Sensors and electronics, provided by Chelsea have just been installed onboard RV Callista, the University of Southampton’s research vessel, as part of the Technology Strategy Board co-funded WaveSentry project and are now collecting real-time wave data.
Wave data is logged against the GPS position of the boat and will be merged with numerous other data streams by HR Wallingford, to enable more accurate 'nowcasting' and forecasting of sea conditions. Current, forecast and historical data can be portrayed to end users via a variety of means including web-enabled devices and email alerts.
Ending in April 2013, the WaveSentry research and development project is running a pilot system in the English Channel to demonstrate how it can improve upon existing services. The system is designed to accept new sources of wave measurement data to further enhance forecast accuracies. ‘Satellite GNSS Reflectometry’ is one such data source being developed by WaveSentry partners Surrey Satellite Technology Ltd and the Southampton National Oceanography Centre. The pilot system will also utilise data gathered by Fugro Emu’s sea bed mounted wave measurement device.
Ocean Business Update: Chelsea Technologies Group will be holding two hands-on workshops onboard RV Callista during Ocean Business, places are still available, so why not join us and learn more about the WaveSentry programme.
For more information please contact:
Ellen Keegan Tel +44 (0)20 8481 9019 or Simon Powell, WaveSentry Project Manager Tel: +44 (0)2380 111 592Sensors and electronics, provided by Chelsea have just been installed onboard RV Callista, the University of Southampton’s research vessel, as part of the TSB funded WaveSentry project and are now collecting real-time wave data. This data will be processed to derive certain indirect sea-state measurements which will be merged with a range of other data feeds within the WaveSentry sea-state measurement and forecasting system.
Primary Productivity Monitoring in the Antarctic using CTG FastOcean FRRf System
Marine photosynthesis is responsible for approximately half the oxygen in our atmosphere. In other words the oxygen in every second breath we take comes from the ocean. For the last 10 years Professor Andrew McMinn and his team from the Institute for Marine and Antarctic Studies, University of Tasmania have been using a Chelsea FastOcean Fast Repetition Rate fluorometer (FRRf) to gain an insight into primary production, photosynthesis and photosynthetic health in the Southern Ocean and Antarctic.
His most recent deployments unearthed some new and interesting results relating to the physiological adaptations of Antarctic phytoplankton surviving in almost complete darkness under the East Antarctic sea ice.
The growth and retreat of Antarctic sea ice is the greatest seasonal cycle on Earth, and one that has a profound influence on the organisms that live in the region. Professor McMinn’s interest is in the very base of the food chain, the phytoplankton and single celled algae that are the foundation for the whole Antarctic ecosystem. Phytoplankton photosynthesize and produce oxygen just like the trees and land plants you see around you everyday. Marine photosynthesis is responsible for approximately half the oxygen in our atmosphere. Changes in sea ice extent and thickness will have massive affects on the phytoplankton and algae in the Southern Ocean and Antarctic regions. Professor McMinn’s interest is in investigating how these changes will play out and how they will influence these extremely important photosynthetic organisms we rely so much on.
Professor McMinn and his team own a number of Chelsea FRR fluorometers. These are deployed from ships (usually large icebreakers) in vertical profiling mode, usually along side CTDs, and in an underway flow through set ups. On their most recent mission the FastOcean ADP Profiling System was deployed through a hole in the sea ice and lowered by hand using a tripod and winches (see photo above).
"The main challenge we face during our regular deployments in the Antarctic", said Professor McMinn "is working in temperatures below -30°C. These conditions are particularly tough on electronic equipment but we were pleasantly surprised with the performance of the FastOcean on our recent Antarctic expedition. The only difficulty, aside from reduced battery life that occurs with all devices in the cold, we experienced with the FastOcean was freezing of the externally mounted dark chamber and pump. This was overcome by pre-heating super saline water and filling the chamber, hosing and pump with this liquid prior to deployment. Once the instrument was in the water the pump behaved normally."
When asked why he choose a Chelsea FRRf, Professor Minns said: “Chelsea is one of the only manufacturers of Fast Repetition Rate Fluorometers and we have many years experience using pervious versions of the FastOcean instruments, so when it came time to replace our instruments the FastOcean was a logical choice.
"We are still using two older versions of the FastOcean. We currently have two Mk I instruments dedicated to long-term international monitoring programs. One is permanently deployed on a Japanese icebreaker and the other on a French icebreaker. These instruments have each done many thousands of hours service and are still performing extremely well. The older of our two instruments has been in service for more than 10 consecutive years. We typically deploy the FastOcean for several months at a time on long Antarctic research voyages. These expeditions usually occur several times a year and when the instruments are not out on these missions they are used in lab based or local field studies back in Australia.”
For more information on this exciting work please contact: Professor Andrew McMinn or his PhD student Mr Robert Johnson, Institute for Marine and Antarctic Studies. For more information on the FastOcean, please contact Ellen Keegan - [email protected]
‘Road Test’ the next generation of coastal & oceanographic monitoring sensors from CTG at Ocean Business
On Tuesday 9 April, Justin Dunning and his team will present an overview of fluorescence measurements and their applications to water quality on board RV Callista during Ocean Business. He will also present field data and demonstrate the new range of UviLux fluorometers.
“These fluorometers can be configured to measure hydrocarbon, faecal contamination, BOD, optical brighteners and CDOM with the most popular applications to date being oil in water monitoring and coastal effluent detection”, reports Chelsea’s Justin Dunning.
Also onboard RV Callista on Wednesday 10 April, Dr Kevin Oxborough and his team will demonstrate the new range of FastOcean FRR fluorometers for in situ and in vitro estimation of gross primary productivity. Additional applications for FastOcean include ballast water monitoring, bloom detection, sea-truthing of satellite data, toxicant detection, coastal monitoring and iron fertilization experiments to name a few. The first production run of FastOcean sensors has now sold out and a second batch is underway.
In a classroom session on Thursday 11 April, Dr Kevin Oxborough will outline the Laboratory and FerryBox-based FastOcean fluorometer systems for running fully automated, continuous fluorescence light curves, including real time PE curve analysis. This session will include the opportunity for hands on experience with a FastAct laboratory system and FastPro8 software.
These events are designed to give Ocean Business delegates an opportunity not only to see first-hand the next generation of coastal and oceanographic monitoring sensors, but also to ‘road test’ them. More Information.
Sewage & Slurry Outflow Monitoring / Waste Water Monitoring - Chelsea Technologies Group is addressing the challenges of effective monitoring of rivers, estuaries and coastal regions against outflow events from waste water treatment works and farm slurry. These challenges have been driven by the EU Bathing Waters Directive, which will introduce new tighter regulation in 2015. In addition, these new in-situ sensors have direct applications within waste water treatment works, which can benefit from improve
Do you own a Chelsea MkI or MkII FastTracka Fluorometer? Take advantage of our FastTracka to FastOcean Upgrade Program - For a limited period we are giving owners of the MkI & MkII FastTrackas Fast Repetition Rate fluorometers the opportunity to upgrade to the latest FastOcean technology at a significant discount. Existing owners can upgrade their old systems for any combination of FastOcean sensors and accessories (including complete APD profiling systems).
Contact Ellen Keegan 44(0)20 8 481 9019 for mo
Chelsea Technologies Group (CTG) will be holding a FREE workshop at the WWEM Conference & Exhibition entitled “Innovative fluorescence technique used to monitor effluent & related environmental parameters” (Wed 7 Nov, 1.30 - Room 5). Delegates will have an opportunity to learn more about CTG’s new UviLux BOD Indicator which enables in-situ real time reporting of levels of sewage and BOD within both natural water systems & water processing plants.
See us on Stand No: 88
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