Bolin Seminars

Welcome to the third seminar in the new Bolin Centre Seminar Series!
The series aims to provide an opportunity to learn about current research topics in the individual research areas of the Bolin Centre and to bring researchers together on a regular basis. We strive to trigger lively discussions and to facilitate both internal and external collaborations.

The host this time is Research Area 3: Hydrosphere, Cryosphere and Climate

"Achilles heel" of carbon capture and storage

 

Speaker: Prof. Sigurdur Reynir Gislason, University of Iceland’s Institute of Earth Sciences
Time: March 24 at 13h00–14h00
Place: Ahlmannsalen, Geoscience Building

Given the unprecedented increase of atmospheric CO2 concentration and its implication for global climate, carbon capture and storage (CCS) is one of the  most promising mitigation options. It is already being demonstrated at a growing number of facilities worldwide.  However, the “Achilles heel” of CCS is its cost and safety. Much of the security risk associated with geologic carbon storage stems from its buoyancy, which can be eradicated by dissolving CO2 into water prior to or during its injection, thus allowing injection into fractured rocks [1]. We have demonstrated the dissolution of CO2 into water during its injection in less than 5 minutes and mineral storage within basalt in two years at 20–50°C at the CarbFix field injection site in SW Iceland [2, 3].

This method requires substantial water, therefore the cost of storing and transporting a tonne of CO2 via the CarbFix method is about twice that of geologic storage via “conventional supercritical” CO2 injection. However, the cost of carbon capture and storage is still dominated worldwide by capture and gas separation [1]. This cost could be lowered by capturing and injecting gas mixtures into rocks as is now being tested at the CarbFix2–Sulfix2 site in SW–Iceland at the Hellisheidi geothermal power plant. Since June 2014 we have injected 8000 tonnes per year of a 60% CO2 and 40% H2S gas mixture, which is dissolved in condensation water from the turbines at 20°C and co–injected with efluent water (60–120°C) into the basaltic rock at 700m depth where the temperature is 250°C.  This injection capacity was doubled mid yer 2016. After about two and a half years of continuous operation, the transmissivity of the injection well is still stable and monitoring data suggests significant mineralisation of the injected gas mixture during this period of injection. This integrated method provides the safe and long-term storage of carbon dioxide and other acid gases at a cost that is significantly lower than the one for conventional CCS metonds [4].

[1] Gislason & Oelkers (2014), Science 344, 373–374.
[2] Sigfússon et al. (2015), International Journal of Greenhouse Gas Control 37, 213–219
[3] Matter et al., 2016, Science 352, 1312–1314
[4] Gunnarsson et al., 2017 (in review).

Note! The lectures will be streamed and saved on the Bolin Centre website.

Welcome!

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Welcome to the second seminar in the new Bolin Centre Seminar Series!
The series aims to provide an opportunity to learn about current research topics in the individual research areas of the Bolin Centre and to bring researchers together on a regular basis. We strive to trigger lively discussions and to facilitate both internal and external collaborations.

The host this time is Research Area 2: Clouds, aerosols, turbulence and climate

Sea spray aerosols and cloud droplet formation

Speaker: Prof. Merete Bilde, Department of Chemistry, Aarhus University
Time: February 27 at 13h00–14h00
Place: Ahlmannsalen, Geoscience Building

Sea spray aerosol is formed by oceanic wave breaking and constitutes a major source of aerosols to the atmosphere. Once emitted sea spray aerosol contributes to the formation of cloud droplets. The role of organic molecules and surfactants in this process is however unclear. This talk addresses the formation and properties of sea spray aerosol and the ability to act as cloud condensation nuclei. Results from laboratory experiments using artificial as well as real sea water will be presented and discussed.

The lectures will be streamed and saved on the Bolin Centre website.

Welcome!

Did not get the chance to attend this seminar?
Watch it at Bolin Centre youtube Channel!

Welcome to the first seminar in the new Bolin Centre Seminar Series!

The host this time is Research Area 1: Oceans‐atmosphere dynamics and climate

Maintenance of Baroclinicity and Storm Tracks in the North Atlantic

Speaker: Prof. Dr. Thomas Spengler, University of Bergen
Time: January 10 at 13h00–14h00
Place: Ahlmannsalen, Geoscience Building

The lectures will usually be streamed and saved on the Bolin Centre website. However, this time the streaming will kindly be hosted by ACES

Abstract:
The maintenance of baroclinicity along the mid- and high-latitude storm tracks is a matter of ongoing debate. Using an isentropic framework, a novel diagnostic based on the tendency equation for the slope of isentropic surfaces – a measure of the potential for baroclinic development – is presented. The tendency comprises contributions from dynamic processes, latent heat release, radiation, and sub-gridscale turbulence, which incorporates the effect of sensible heat fluxes. A climatology of these tendencies over the North Atlantic is compiled for the winters 2009 and 2010.
It is found that adiabatic tilting flattens the isentropic surfaces, reflecting the action of growing baroclinic cyclones. This tendency is climatologically balanced by the generation of slope by diabatic processes. In the lower troposphere, the most intense diabatic increase of slope is found along the oceanic frontal zone associated with the Gulf Stream and at higher latitudes in the Labrador Sea, the Nordic Seas and the Barents Sea. Latent heat release and sensible heat fluxes both contribute substantially in these regions. A quantitative analysis of cold air outbreaks emphasises their important role for restoring the slope in the lower troposphere over the Gulf Stream region and off the sea-ice edge at high latitudes. In the upper troposphere, latent heat release due to cloud microphysical processes is the dominant mechanism maintaining the slope.

Welcome!

Did not get the chance to attend this seminar?
Watch it at Bolin Centre youtube Channel!

 

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