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Research & Projects

Continuous long-term observations of the marine ecosystem
FerryBox systems operated at Helmholtz-Zentrum Hereon. -Image: Wilhelm Petersen/Hereon

FerryBox systems operated at Helmholtz-Zentrum Hereon. -Image: Wilhelm Petersen/Hereon-

Most of our understanding of the processes in the marine environment is restricted to observations from single measurement campaigns (e.g. research cruises) during a certain period of time, or time series collected at a certain position (e.g. buoys). Comprehensive research and analysis of marine biogeochemical processes is only possible when observations from research vessels, remote sensing (radar, satellite) and fixed stations (buoys, poles) is combined. We use ships of opportunity, along with research vessels and fixed stations to investigate seasonal and regional patterns in biogeochemical parameters (primarily) in surface waters. When the frequency of measurements is high, we can investigate the effects of storms, tides, seasonal and interannual patterns on coastal and estuarine systems. We can also study how infrequent events (e.g. extreme floods or droughts) or long-term changes (climate induced changes, coastal ocean acidification, changes in pollution state) change the marine ecosystem.

Installation of a <i>FerryBox</i> system onboard cargo vessel <i>Hafnia Seaways</i>. <i>-Image: KD/Hereon-</i>

Installation of a FerryBox system onboard cargo vessel Hafnia Seaways. -Image: KD/Hereon-

The Department of Coastal Productivity uses data from FerryBoxes to carry out long-term water quality measurements in coastal regions like the North Sea, with a focus to the carbon cycle.
In order to ensure their reliability, the observations are first subjected to automated quality control before they are transferred to a database in real-time or near real time. Bottle samples for some parameters (e.g. dissolved oxygen, salinity, etc.), collected along the FerryBox routes, are analyzed in the lab, and then compared to the FerryBox measurements providing additional quality control.
Statistical methods like time series analysis, in combination with numerical models (including eco-system models), are applied to the long-term observations to study seasonal and regional patterns in the North Sea.

Time-series of pCO2 measurements along the transect from Halden (NO) to Zeebrugge (BE).-Image: http://ferrydata.hzg.de / Hereon-

Time-series of pCO2 measurements along the transect from Halden (NO) to Zeebrugge (BE). -Image: http://ferrydata.hzg.de / Hereon-

Furthermore, a comparison of the FerryBox data to satellite data can be used to understand the larger spatial variations certain variables, such as chlorophyll-a.
Subtle changes in coastal waters, which can only be captured by continuous monitoring of marine processes over several years, can then be unraveled and assessed. Furthermore, these high-resolution long-term observations can provide the background to study in detail the impact of different scenarios (e.g. extreme events or climate induced changes) in marine ecosystems.

KCP_Figure_FerryBox1

Figure from Macovei et al. (2021a). Continuously measured pCO2 (a) during the fall 2016 passages through the Skagerrak region using a showerhead equilibrator system (red) and a FerryBox (black/blue). Blue was used to identify the crossings with the highest pCO2 values. Map of the restricted Skagerrak box (b) with the locations of the measurements shown in the respective color. Dissolved oxygen saturation (c) and NBS scale pH (d) measured by the FerryBox and shown in relation to the ship routes during fall 2016. -image: KCP / Hereon-

The integration of FerryBoxes on commercial ships allows to observe changes in surface waters on different scales: for example what are seasonal and yearly changes in salinity, temperature, dissolved oxygen, pH, algae. Regional characteristics, such as location and characteristics of water masses can also be identified. A study in the Skagerrak Strait between Denmark and Norway compared FerryBox measurements of pCO2 (black) against data from another ship in the ICOS network (red). The study found matching results when the journeys coincided (mid-September and end of October, 2016). However, when the FerryBox-equipped ship travelled on a more eastern route (blue), it captured a water mass with markedly different chemical signature (higher in pCO2, less oxygenated and more acidic), emphasising how dynamic the coastal marine environment can be.

See also Macovei et al. (2021)

The Carbon Cycle
Extreme events
Developing new Measuring Instruments

Projects

Logo Carbostore

CARBOSTORE

CARBOSTORE (Carbon Storage in German Coastal Seas - Stability, Vulnerability and Perspectives for Manageability) is a joint project funded by the Federal Ministry of Education and Research (BMBF) in the research program "MARE: N - Coastal, Marine and Polar Research for Sustainability” under the umbrella of the Research Framework Program“ Research for Sustainable Development” (FONA).

With reference to the BMBF tender of July 26, 2019, CARBOSTORE is particularly dedicated to the “analysis of interactions between physically conditioned and biogeochemical cycles (especially CO2 uptake / biological pump) under the combined influence of global change and other directly anthropogenic influencing factors”. This question is being investigated for the two marginal seas, the North Sea and the Baltic Sea, whose coastline runs partly through German territory.

The main goal of CARBOSTORE is to investigate the stability and vulnerability of various carbon stores in the German tributaries of the North and Baltic Seas. For this purpose, it is checked whether and to what extent processes that are responsible for carbon storage are or will be influenced. Based on these studies of vulnerability, and taking into account the relevant legal and socio-economic framework conditions, perspectives are developed that allow the targeted increase in carbon storage in the North and Baltic Seas, ie, net negative CO2 emissions, have the objective.

Further information can be found on the CARBOSTORE website.

Jerico Banner

JERICO-NEXT
(Joint European Research Infrastructure network for Coastal Observatory – Novel European eXpertise for coastal observaTories)

The coastal area is the most productive and dynamic environment of the world ocean with significant resources and services for mankind. JERICO-NEXT (33 organizations from 15 countries) emphasizes that the complexity of the coastal ocean cannot be well understood if interconnection between physics, biogeochemistry and biology is not guaranteed. Such an integration requires new technological developments allowing continuous monitoring of a larger set of parameters. In the continuity of JERICO (FP7), the objective of JERICO-NEXT consists in strengthening and enlarging a solid and transparent European network in providing operational services for the timely, continuous and sustainable delivery of high quality environmental data and information products related to marine environment in European coastal seas.

The main objectives of JERICO-NEXT are to support European coastal research communities, enable free and open access to data, enhance the readiness of new observing platform networks by increasing the performance of sensors, showcase of the adequacy of the so-developed observing technologies and strategies, and to propose a medium-term roadmap for coastal observatories through a permanent dialogue with stakeholders. JERICO-NEXT is based on a set of technological and methodological innovations. One main innovation potential is to provide a simple access to a large set of validated crucial information to understand the global change in coastal areas.

Furthermore, JERICO-NEXT provides coordinated ‘free of charge’ trans-national access to researchers or research teams from academy and industry to original coastal infrastructures operated by the projects consortium. This access opportunity is expected to help building long-term collaborations between users and to promote innovation and transfer of know-how in the coastal marine sector. Within this approach Hereon offers different research platforms including FerryBoxes, Gliders and cabled observatories (in cooperating with the Alfred Wegner Institute (AWI)).


Further information can be found on the JERICOnext website.

NeXos-Logo_

NeXOS
(Next Generation Web-Enabled Sensors for the Monitoring of a Changing Ocean)

The NeXOS project aimed to improve the temporal and spatial coverage, resolution and quality of marine observations through the development of cost-efficient innovative and interoperable in-situ sensors deployable from multiple platforms. This was achieved through the development of new, low-cost, compact and integrated sensors with multiple functionalities including the measurement of key parameters useful to a number of objectives, ranging from more precise monitoring and modelling of the marine environment to an improved assessment of fisheries.
These sensors are based on optical and acoustics technologies, addressing a majority of descriptors identified by the Marine Strategy Framework Directive for Good Environmental Status. All new sensors respond to multiplatform integration, sensor and data interoperability, quality assurance and reliability requirements. The sensors were calibrated, integrated on several types of platforms, scientifically validated and demonstrated.

Within the framework of NeXOS the Department of Global Coast has developed a Hyper Spectral Absorptions Sensor (HyAbS) optimized for an automated operation within flow-through systems such as the FerryBox, providing proxies of phytoplankton biomass, suspended particles in the water column and phytoplankton species composition. Additionally, a sensor for measuring parameters of the carbon cycle (pH, alkalinity and CO2) is under further optimisation in cooperation with Norwegian
partners.

Further information can be found on the NeXOSwebsite.

EnviGuard-Logo_

EnviGuard is a response to the growing need for accurate real time monitoring of the seas/ocean and the aquaculture industries need for a reliable and cost-effective risk management tool. The implementation of the EnviGuard system will allow for early detection of harmful algae blooms (HAB), chemical contaminants, viruses and toxins thus preventing economic losses. The modular EnviGuard system will be made up of three different sensor modules (microalgae / pathogens, i.e. viruses & bacteria / toxins & chemicals), that are connected to the common interface ‘EnviGuard Port’ which collects and sends the information to a server. The data will be accessible through a website in real-time. The biosensors to be developed in the project go far beyond the current state-of-the art in terms of accuracy, reliability and simplicity in operation by combining innovations in nanotechnology and molecular science leading to the development of cutting-edge sensor technology.

Within the framework of the EU project EnviGuard, the Alfred Wegner Institute (AWI) is further developing a biosensor for detecting different phytoplankton species for use in FerryBox systems. The biosensor will include automated sampling and sample processing. The Department of In-situ Measurements is contributing to the development of this biosensor by testing and optimizing the sensor for the autonomous use in connection to FerryBox systems and real time data transmission.


Further information can be found on the EnviGuard website.

Bilateral project China – Germany:
Cost-Effective Monitoring of Water Quality in the Northern Yellow Sea


The environment in the Yellow Sea, between China and the Korean Peninsula, has been dramatically impacted in the last few decades. These environmental changes are now to be continuously observed. To this end, the project “Economical Methods for Observing Water Quality in the Northern Yellow Sea" was founded and is supported by the Federal Ministry of Education and Research.

The Department of In Situ Measurements possesses an automated, economical measurement system for large-scale observation with their FerryBox system.
Together with the Institute of Coastal Research in Yantai, China, a ferry line in the Bohai Bay demonstrates the applicability of the FerryBox for observing water quality in the Yellow Sea.

Chinese scientists visit the Hereon for exchanging knowledge and for training in use of the FerryBox, whereas the Department of In Situ Measurements, with the aid of a portable FerryBox, operates various measurement campaigns on board a ferry in the Bohai Bay during different seasons.

The aim is to establish economical and continuous large-scale water quality observations in the Yellow Sea with the aid of FerryBoxes and other observational methods.