Year of grant:
Náttúra og náttúrutilfeingi
Kanning av eginleikunum hjá nano-partiklum úr havinum við Føroyar og hvussu gróðurin á landgrunninum ávirkar partiklarnar.
Verkætlan á Aarhus Universitet
Marianne Glasius, Tina Santl-Temkiv, Bernadette Rosati, Knud Simonsen, Eilif Gaard, Karin Margretha H. Larsen og Matthew E. Salter
Grant from the FRC in DKK:
Sea spray aerosols that form when waves break are a part of everyday life in the Faroe Islands. They leave a layer of sea salt on all surfaces exposed to the wind, but sea spray aerosols are also important on a much larger scale through their role in Earth's climate system. Sea spray aerosols are one of the most important natural aerosols on Earth. These aerosol particles are formed by the action of wind on the ocean, which forms waves that subsequently break, entraining bubbles into the water. When these bubbles reach the ocean surface, they burst resulting in the release of many tiny droplets. These sea spray droplets affect global climate via their ability to scatter sunlight and/or act as a surface, where water can condense on to form clouds (a so-called cloud condensation nuclei, CCN). The particle production and properties are dependent on the chemical composition of the seawater, but the related chemical and physical processes are poorly understood. Our understanding of sea spray aerosol remains limited and establishing a connection between marine microbiological processes, sea spray aerosol composition, and cloud condensation nuclei is still an elusive challenge. The goal of this project is to understand and describe how chemical and physical properties of sea spray aerosols are linked to the spring/summer phytoplankton bloom around the Faroe Islands and to place the results in the context of global climate. The specific research questions we would like to address are the following: - Does the size distribution of sea spray particles generated from ocean water change as a result of the phytoplankton blooms during spring/summer in the water around the Faroe Islands? - Is there a change in chemical composition and CCN activity of sea spray aerosol generated from ocean water as a result of the phytoplankton bloom? - Is there a diurnal variation in sea spray aerosol properties? We propose intensive field campaigns in the Faroe Islands during spring / summer 2019 interconnected with laboratory experiments. We will locate our sampling station in Skopun, since there is a unique continues supply of ocean water and the additional benefits of the Faroe Marine Research Institute routine measurements. State of the art instrumentation will be available for sampling, e.g. the seawater, the sea surface microlayer and sea spray aerosol particles, to characterize chemical composition, aerosol properties and cloud condensation activity.