H2020Индивидуална стипендия2016–2018

TOXIC-RISK · Systematic investigation of the spatiotemporal variability of TOXIC hydrogen sulphide events and their potential RISKs for the Namibian fishing and aquaculture industry

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2016-07-01 → 2018-06-30
Финансиране от ЕС: 185 076 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Изригванията на токсичен сероводород и разпространението на серни облаци в северната част на системата Бенгела се анализират според сезона и местоположението им. Те могат да доведат до масово загиване на риби, миди и скариди, което застрашава риболовната индустрия в Намибия.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Systematic investigation of the spatiotemporal variability of TOXIC hydrogen sulphide events and their potential RISKs for the Namibian fishing and aquaculture industry

The Benguela upwelling system sustains a very high primary production due to the upwelling of nutriment rich waters forced by trade winds. Due to the subsequent export production and the intense remineralisation, an oxygen minimum zone is present in the northern Benguela upwelling system. Hydrogen sulphide (H2S) outbreaks and their sulphur (S0) plumes are unique events in this region (Fig. 1). They influence the marine ecosystem due to their toxic effects, have direct impacts on the biogeochemical cycles and are able to affect the human life. The local fish and shellfish industry, an important Namibian economic factor, is threatened. H2S-outbreaks can cause the mass mortality of commercially important fishes, oysters, shrimps and prawns. The TOXIC-RISK project contributed to the understanding of the H2S-outbreaks and their S0-plumes. The overall objective was the investigation of the variability of S0-plumes. Conclusions (Ohde & Dadou, 2018, PLoSONE, e0192140. https://doi.org/10.1371/journal.pone.0192140): “The sulphur events have a strong seasonal cycle with pronounced main and off-seasons forced by local and remote-driven processes. The main peak season is in late austral summer and early austral autumn at the beginning of the annual upwelling cycle caused by increasing equatorwards alongshore winds. The sulphur plume activity is high between February and April during the seasonal oxygen minimum associated with the seasonal reduction of cross-shore ventilation of the bottom waters, the seasonal southernmost position of the Angola Benguela Frontal Zone (ABFZ), the seasonal maximum of water mass fractions of South Atlantic and Angola Gyre Central Waters (SACW and AGCW) as well as the seasonal arrival of the downwelling coastal trapped waves. The off-season is in austral spring and early austral summer during increased upwelling intensity and enhanced oxygen supply. The annual variability of sulphur events is characterized by very high activities in years 2004, 2005 and 2010 interrupted by periods of lower activity in years 2002 to 2003, 2006 to 2009 and 2011 to 2012. This result can be explained by the relative contributions or adding effects of local and remote-driven forces (from the equatorial area). The probability for the occurrence of sulphur plumes is enhanced in years with a lower annual mean of upwelling intensity, decreased oxygen supply associated with decreased lateral ventilation of bottom waters, more southern position of the ABFZ, increased mass fraction of South Atlantic Central Water and stronger downwelling coastal trapped waves.”

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The scientific focus is on the study of hydrogen sulphide outbreaks and their sulphur plumes in the Namibian Benguela upwelling system. They are unique events not found anywhere else in the world oceans with such intensity. These outbreaks influence the Namibian ecosystem, the local fishing industry and the aquaculture farming, a rapidly growing industrial sector, as well as the tourism because of their toxic properties. So far there are only sporadic investigations. No systematic long-term studies and statistical analyses with respect to their frequency, intensity, extension and involved processes were conducted. Therefore, the objective is to study their spatiotemporal variability in relation to dynamical processes such as wind and upwelling conditions, circulation of water masses, productivity and climate indices mainly on the basis of EU satellite archives, coupled physical-biogeochemical models and in-situ data. This supports the initiative of the ESA to monitor coastal zones with upcoming sensors (i.e. SENTINEL-3). The product will be a geo-information system containing their spatiotemporal variability and the affected Namibian coastal areas. Other milestones will be a hazard analysis and a risk assessment for the Namibian fishing and aquaculture industry. All results will be provided to local research institutes which will improve the reusability of the scientific findings and will support the EU relationships to Namibian authorities. The innovative aspect is that the programme will contribute to the understanding and predictability of these toxic events in the studied area as well as potentially in other areas in the EU and outside the EU. This fellowship can be only performed in close collaboration between the supervisor and the experienced researcher as different research methods such as modelling and remote sensing must be combined. This involves a two-way knowledge transfer and training of both applicants which will contribute to the researches career.

Оригинален текст от CORDIS (на английски).

Участници

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS · ParisКоординаторФранция