Atmospheric deposition and ocean biogeochemistry: in situ observation, processes studies and modeling approach

Time:
10:00-12:00 UTC+2, Tuesday, 12th July 2022
Online
 

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Host:
Laboratoire d'Océanographie de Villefranche, Centre National de la Recherche Scientifique & Sorbonne University, France
Conveners:
Cécile Guieu (Laboratoire d'Océanographie de Villefranche, Centre National de la Recherche Scientifique & Sorbonne University, France)
 

Speakers

Joan Llort
Barcelona Supercomputing Centre, Spain
 
Title: The impact of wildfire aerosols on ocean biogeochemistry
 
Abstract: Droughts and climate-change-driven warming are leading to more frequent and intense wildfires around the world. Modelling studies suggest that aerosol emissions from wildfires can lead to the atmospheric transport of macronutrients and bio-essential trace metals such as nitrogen and iron, respectively. This seminar will present some recent observational evidences of how wildfires aerosols fertilise ocean phytoplankton blooms. We will also discuss the open questions that arise from this previously undocumented mechanism.
 
Frédéric Gazeau
Laboratoire d'Océanographie de Villefranche, Centre National de la Recherche Scientifique & Sorbonne University, France
 
Title: Impact of dust addition on Mediterranean plankton communities under present and future conditions of pH and temperature
 
Abstract: The potential impact of dust deposition both in present and future climate conditions was investigated through three perturbation experiments in the open Mediterranean Sea (Tyrrhenian Sea, Ionian Sea and Algerian basin) during a cruise conducted in May/June 2017 in the frame of the ProcEss studies at the Air-sEa Interface after dust deposition in the MEditerranean sea (PEACETIME) project.
 
Matthieu Bressac
Laboratoire d'Océanographie de Villefranche, Centre National de la Recherche Scientifique & Sorbonne University, France
 
Title: Role of dust in surface and mesopelagic biogeochemical cycles
 
Abstract: The response of the iron and aluminium cycles to dust input was recently investigated through direct observations of two mineral dust wet deposition events that occurred in open Mediterranean waters. In this seminar, we will discuss the importance of considering the impact of dust deposition in near-surface waters, but also deeper in the mesopelagic if we are to fully understand the role of dust in oceanic biogeochemical cycles.
 

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