Pär Jansson
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View article: Cruise report CAGE15-3
Cruise report CAGE15-3 Open
The cruise had two main objectives: Deployment of the two CAGE ocean floor observatories (OS1 and OS2) at shallow PKF site and deeper PKF site; CAGE ocean floor observatories were designed and build as collaborative work of CAGE scientists…
View article: CAGE18-5 Cruise report : Remotely-operated vehicle (ROV) investigations of active gas seepage sites in the Barents Sea
CAGE18-5 Cruise report : Remotely-operated vehicle (ROV) investigations of active gas seepage sites in the Barents Sea Open
Cruise CAGE18-5 was the first research expedition under the helm of UiT The Arctic University of Norway in Tromsø with the new ice-going research vessel R/V Kronprins Håkon. This new vessel provides new opportunities to collect cross-disci…
View article: Autonomous methane seep site monitoring offshore western Svalbard: hourly to seasonal variability and associated oceanographic parameters
Autonomous methane seep site monitoring offshore western Svalbard: hourly to seasonal variability and associated oceanographic parameters Open
Improved quantification techniques of natural sources are needed to explain variations in atmospheric methane. In polar regions, high uncertainties in current estimates of methane release from the seabed remain. We present unique 10- and 3…
View article: Comment on os-2021-85
Comment on os-2021-85 Open
Abstract. Improved quantification techniques of natural sources are needed to explain variations in atmospheric methane. In polar regions, high uncertainties in current estimates of methane release from the seabed remain. We present unique…
View article: Autonomous methane seep site monitoring offshore Western Svalbard: Hourly to seasonal variability and associated oceanographic parameters
Autonomous methane seep site monitoring offshore Western Svalbard: Hourly to seasonal variability and associated oceanographic parameters Open
Improved quantification techniques of natural sources is needed to explain variations in atmospheric methane. In polar regions, high uncertainties in current estimates of methane release from the seabed remain. We present two unique 10 and…
View article: Cold seep hibernation in the Arctic sediments during cold bottom water conditions
Cold seep hibernation in the Arctic sediments during cold bottom water conditions Open
<p>Large amounts of methane are trapped within gas hydrate in sub-seabed sediments in the Arctic Ocean, and bottom-water warming may induce the release of methane from the seafloor. Yet, the effect of seasonal temperature variations …
View article: Replication Data for: Physical controls of dynamics of methane venting from a shallow seep area west of Svalbard
Replication Data for: Physical controls of dynamics of methane venting from a shallow seep area west of Svalbard Open
Data are the basis for the publication "Physical controls of dynamics of methane venting from a shallow seep area west of Svalbard" by Silyakova and co-authors. It was prepared at CAGE, Centre for Arctic Gas Hydrate, Environment and Climat…
View article: Replication Data for: Reduced methane seepage from Arctic sediments during cold bottom-water conditions
Replication Data for: Reduced methane seepage from Arctic sediments during cold bottom-water conditions Open
This dataset contains all the necessary data for reproducing the results in the article. "Reduced methane seepage from Arctic sediments during cold bottom-water conditions"
View article: High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site
High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site Open
Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and disc…
View article: Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard
Variability of Acoustically Evidenced Methane Bubble Emissions Offshore Western Svalbard Open
Large reservoirs of methane present in Arctic marine sediments are susceptible to rapid warming, promoting increasing methane emissions. Gas bubbles in the water column can be detected, and flow rates can be quantified using hydroacoustic …
View article: Replication Data for: High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site
Replication Data for: High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site Open
Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean- and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and dis…
View article: High-resolution under-water laser spectrometer sensing provides new insights to methane distribution at an Arctic seepage site
High-resolution under-water laser spectrometer sensing provides new insights to methane distribution at an Arctic seepage site Open
Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean- and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and dis…
View article: A new numerical model for understanding free and dissolved gas progression toward the atmosphere in aquatic methane seepage systems
A new numerical model for understanding free and dissolved gas progression toward the atmosphere in aquatic methane seepage systems Open
We present a marine two‐phase gas model in one dimension (M2PG1) resolving interaction between the free and dissolved gas phases and the gas propagation toward the atmosphere in aquatic environments. The motivation for the model developmen…
View article: Replication Data for: A new numerical model for understanding free and dissolved gas progression towards the atmosphere in aquatic methane seepage systems
Replication Data for: A new numerical model for understanding free and dissolved gas progression towards the atmosphere in aquatic methane seepage systems Open
This dataset contains the files needed to replicate the reference simulation results of the numerical model M2PG1. Please refer to the README.txt file for detailed instructions on how to reproduce the simulation results.
View article: Methane at Svalbard and over the European Arctic Ocean
Methane at Svalbard and over the European Arctic Ocean Open
Methane (CH4) is a powerful greenhouse gas. Its atmospheric mixing ratios have been increasing since 2005. Therefore, quantification of CH4 sources is essential for effective climate change mitigation. Here we report observations of the CH…
View article: Sub-Ocean: Subsea Dissolved Methane Measurements Using an Embedded Laser Spectrometer Technology
Sub-Ocean: Subsea Dissolved Methane Measurements Using an Embedded Laser Spectrometer Technology Open
We present a novel instrument, the Sub-Ocean probe, allowing in situ and continuous measurements of dissolved methane in seawater. It relies on an optical feedback cavity enhanced absorption technique designed for trace gas measurements an…
View article: Supplementary material to "Methane at Svalbard and over the European Arctic Ocean"
Supplementary material to "Methane at Svalbard and over the European Arctic Ocean" Open
Figure S1: Methane mixing ratios at the RV Helmer Hanssen vs apparent wind angle relative to the bow (β), using β=arcos(W cos α + V/ √(W2+V2+2WV cos α)) where α=true pointing angle, W=true wind velocity, and V=ship velocity.
View article: Methane at Svalbard and over the European Arctic Ocean
Methane at Svalbard and over the European Arctic Ocean Open
Methane (CH4) is a powerful greenhouse gas and atmospheric mixing ratios have been increasing since 2005. Therefore, quantification of CH4 sources is essential for effective climate change mitigation. Here we report observations of the CH4…
View article: Tidal Energy Loss, Internal Tide Radiation, and Local Dissipation for Two-Layer Tidal Flow over a Sill
Tidal Energy Loss, Internal Tide Radiation, and Local Dissipation for Two-Layer Tidal Flow over a Sill Open
A simple analytical model for tidal energy loss at fjord sills and its partitioning into local dissipation and radiated internal tides is presented. The analytical model builds on a two-layer assumption with quasi-steady nonlinear flow ove…
View article: Extensive release of methane from Arctic seabed west of Svalbard during summer 2014 does not influence the atmosphere
Extensive release of methane from Arctic seabed west of Svalbard during summer 2014 does not influence the atmosphere Open
We find that summer methane (CH 4 ) release from seabed sediments west of Svalbard substantially increases CH 4 concentrations in the ocean but has limited influence on the atmospheric CH 4 levels. Our conclusion stems from complementary m…