Quantifying nutrient recovery by element flow analysis: Harvest and use of seven marine biomasses to close N and P loops

Sinha, Rajib; Thomas, Jean‐Baptiste; Strand, Åsa; Söderqvist, Tore; Stadmark, Johanna; Franzén, Frida; Ingmansson, Ida; Gröndahl, Fredrik; Hasselström, Linus

doi:10.1016/j.resconrec.2021.106031

Cited by 15 publications

(6 citation statements)

References 43 publications

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“…It has been shown that nutrient levels of shore water can be strongly correlated with beach wrack biomass, suggesting a direct export of nutrients from decomposing wrack (Dugan et al 2011). Although nutrient leaking was not studied in the present study, beach wrack from the region of the present study has been reported to contain an average of 19 kg N and 2 kg P for every ton of wrack (Sinha et al 2022), so if the Tja ¨lderviken site alone contains * 500 tons of beach wrack, it would mean that cleaning the beach from this amount of wrack could prevent around 9500 kg N and 1000 kg P to reach the coastal water. This would be a considerable advantage as the Baltic waters are already eutrophic (Murray et al 2019).…”

Section: Discussionmentioning

confidence: 59%

Methane emissions from macrophyte beach wrack on Baltic seashores

Björk

Rosenqvist

Gröndahl

et al. 2022

Ambio

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Beach wrack of marine macrophytes is a natural component of many beaches. To test if such wrack emits the potent greenhouse gas methane, field measurements were made at different seasons on beach wrack depositions of different ages, exposure, and distance from the water. Methane emissions varied greatly, from 0 to 176 mg CH4-C m−2 day−1, with a clear positive correlation between emission and temperature. Dry wrack had lower emissions than wet. Using temperature data from 2016 to 2020, seasonal changes in fluxes were calculated for a natural wrack accumulation area. Such calculated average emissions were close to zero during winter, but peaked in summer, with very high emissions when daily temperatures exceeded 20 °C. We conclude that waterlogged beach wrack significantly contributes to greenhouse gas emissions and that emissions might drastically increase with increasing global temperatures. When beach wrack is collected into heaps away from the water, the emissions are however close to zero.

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Section: Discussionmentioning

confidence: 59%

Methane emissions from macrophyte beach wrack on Baltic seashores

Björk

Rosenqvist

Gröndahl

et al. 2022

Ambio

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“…Also, Saraiva et al in 2019 predicted an intensification of eutrophication in the Baltic Sea by the end of the 21st century, under the auspices of climate warming and high nutrient loads [25]. In the work by Sinha et al [26], the social decisions about climate change mitigation, which will dramatically impact eutrophication in the 21st century, were analyzed. They examined the impact of changes in land use and land management and concluded that excessive nitrogen runoff will greatly affect the global ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Overview of the Eutrophication in Romanian Lakes and Reservoirs

Dumitran,

Vuta,

Popa

2024

Limnological Review

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In this paper, attention is drawn to the deterioration of Romanian surface water ecosystems due to eutrophication, an important environmental issue both at national and international levels. An inventory of existing studies dealing with the issue of the eutrophication of lakes and reservoirs in Romania is made, aiming to identify the main problems Romania is facing in monitoring, classifying, and managing eutrophic ecosystems. On Web of Science, the keyword “Eutrophication”, with “Romania” as country/region, leads to 50 publications, which are analyzed in this review. The number of articles found does not reflect the real environmental issue represented by eutrophic lakes and reservoirs in Romania. At a national level, only 126 lakes and reservoirs have been monitored and assessed between 2018 and 2020, in terms of ecological status/ecological potential. Thus, at a global evaluation, 77% of natural lakes and 33% of artificial ones do not reach the quality objectives. The results of this study showed that the frequency of measurements taken by water quality indicators is not the strongest point of measurement campaigns, as it is not sufficient for the diagnosis of eutrophic lakes, and supplementary measures must be undertaken to better understand and mitigate this phenomenon.

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“…Low-trophic species thus also may hold the key to mitigating eutrophication, at least at a local level. Depending on the use of the biomass, for example for long-lived biomaterials or as a fertilizer, the CO 2 may be captured for a longer period of time and also work as a temporary carbon sink [8]. Furthermore, studies of large seaweed cultivation in Sweden have also shown a positive effect on biodiversity in and around the cultivation sites [9], so regular inspections could help to document local environmental change.…”

Section: Introductionmentioning

confidence: 99%

A System for Autonomous Seaweed Farm Inspection with an Underwater Robot

Stenius

Folkesson

Bhat

et al. 2022

Sensors

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This paper outlines challenges and opportunities in operating underwater robots (so-called AUVs) on a seaweed farm. The need is driven by an emerging aquaculture industry on the Swedish west coast where large-scale seaweed farms are being developed. In this paper, the operational challenges are described and key technologies in using autonomous systems as a core part of the operation are developed and demonstrated. The paper presents a system and methods for operating an AUV in the seaweed farm, including initial localization of the farm based on a prior estimate and dead-reckoning navigation, and the subsequent scanning of the entire farm. Critical data from sidescan sonars for algorithm development are collected from real environments at a test site in the ocean, and the results are demonstrated in a simulated seaweed farm setup.

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Quantifying nutrient recovery by element flow analysis: Harvest and use of seven marine biomasses to close N and P loops

Cited by 15 publications

References 43 publications

Methane emissions from macrophyte beach wrack on Baltic seashores

Methane emissions from macrophyte beach wrack on Baltic seashores

Overview of the Eutrophication in Romanian Lakes and Reservoirs

A System for Autonomous Seaweed Farm Inspection with an Underwater Robot

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