Mapping deep-water gas emissions with sidescan sonar

Emissions of methane gas from cold seeps on the seafloor have a strong impact on a number of biogeochemical processes. These processes include the development of deepsea benthic ecosystems via the process of anaerobic oxidation of methane [Boetius et al., 2000] or the precipitation of carbonates [Ritger et al., 1987]. The fluxes of other chemical species associated with methane emissions may even influence the chemical composition of seawater [Aloisi et al., 2004]. Such gas emissions may have been much more intensive in the past with a strong impact on global climate [Dickens, 1999], as suggested by carbon isotope data

SolarPACES Guideline for Heliostat Performance Testing - Release v1.0

Based on national drafts, a group of R&D and industry experts as members of the SolarPACES task III heliostat working group has been working since 2012 on the creation of a guideline for heliostat performance testing. It contains a well-defined list of parameters to describe heliostats and their performance, as well as a list for deriving these parameters. After applying the draft to several industrial and research heliostats (e.g. [1]) and iterative improvements, version 1.0 of the guideline has been released

Technical, ecological and economic analysis of solar thermal power towers

Für die solare Stromerzeugung im großtechnischen Maßstab werden bislang ausschließlich solarthermische Anlagen eingesetzt, und zwar Parabolrinnenkraftwerke und Turm-Solarkraftwerke. Aufgrund der mit Turm-Solarkraftwerken erreichbaren hohen Temperaturen bieten diese Anlagen ein großes Potenzial, den hohen Exergiegehalt der Solarstrahlung effizient zur Stromerzeugung zu nutzen. Vor diesem Hintergrund wird in dieser Arbeit ein Verfahren zur technischen, ökologischen und ökonomischen Analyse von Turm-Solarkraftwerken entwickelt und exemplarisch angewandt, um damit ein Werkzeug für die Weiterentwicklung dieses Kraftwerktyps zur Verfügung zu stellen.It is the objective of this thesis to develop a methodology for the technical, ecological and economic analysis of solar thermal power towers, in order to supply a tool for the further development of this type of power plant. The investigation focuses on the heliostat field, as a large portion of the investment and operational costs of a power tower are related to it

M134/1 raw data of EM122 multibeam echosounder (bathymetry, beam time series & water column data)

Multibeam echosounder (MBES) data recorded during RV METEOR cruise M134/1 between 16.01.2017 and 18.02.2017 around South Georgia. The main objective of was to investigate emissions of free gas from cross‐shelf troughs of South Georgia, their distribution, quantification, and sources for methane ebullition sites in sub‐Antarctic waters. Another objective was the mapping of the glacial bathymetry on the shelf. CI Citation: Paul Wintersteller ([email protected]) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the cruise RV METEOR M134/1 the hull-mounted Kongsberg EM122 with a nominal sonar frequency of 12 kHz was utilized. The EM122 system is a deep‐water multibeam echosounder providing accurate bathymetric mapping down to full ocean depth. 288 beams with an acoustical footprint of 1°(TX)/2°(RX) are formed for each ping. For further information consult https://www.km.kongsberg.com/. During this cruise the swath width was set to 130° and the high-density equidistant and the dual-swath mode of the EM122 was used, resulting in up to 864 soundings per ping. The survey speed was kept between 6-10 knots depending on weather conditions and flare surveying. The main purposes of most of the surveys were mapping for bathymetry and searching for gas flares in the water column. Since the EM710 was recording almost continuously, the EM122 was mainly used for transits, in water depth deeper than 500 m or for short dedicated surveys in order to achieve better backscatter information. Responsible person during this cruise / PI: Wilhelm Weinrebe ([email protected]) & Paul Wintersteller ([email protected]). Chief Scientist: G. Bohrmann ([email protected]) CR: https://elib.suub.uni-bremen.de/edocs/00106081-1.pdf CSR: http://www.bsh.de/aktdat/dod/fahrtergebnis/2017/20170002.htm A special thanks goes to the watch keeper during M134/1: Viola Bihler, Maximilian Grahs, Miriam Römer and Nikolas Stange

M134/1 raw data of EM710 multibeam echosounder (bathymetry, beam time series & water column data)

Multibeam echosounder (MBES) data recorded during RV METEOR cruise M134 between 16.01.2017 and 18.02.2017 around South Georgia. The main objective of was to investigate emissions of free gas from cross‐shelf troughs of South Georgia, their distribution, quantification, and sources for methane ebullition sites in sub‐Antarctic waters. Another objective was the mapping of the glacial bathymetry on the shelf. CI Citation: Paul Wintersteller ([email protected]) as responsible party for bathymetry raw data ingest and approval. Description of the data sources: During the cruise RV METEOR M134/1 the hull-mounted Kongsberg EM710 with a nominal sounding frequency of 70-100 kHz was utilized. 256 beams with an acoustical footprint of 1°(Tx)/1°(Rx) are formed for each ping. For further information consult: http://epic.awi.de/26726/1/Kon2007b.pdf. The main purposes of most of the surveys were mapping for bathymetry and searching for gas flares in the water column. The EM710 was recording almost continuously. During this cruise the swath width was set to 130° and the use of the high-density equidistant and the dual-swath mode of the EM710 resulted in up to 800 soundings per ping. The survey speed was kept between 6-10 knots depending on weather conditions and flare surveying. Responsible person during this cruise / PI: Wilhelm Weinrebe ([email protected]) & Paul Wintersteller ([email protected]). Chief Scientist: G. Bohrmann ([email protected]) CR: https://elib.suub.uni-bremen.de/edocs/00106081-1.pdf CSR: http://www.bsh.de/aktdat/dod/fahrtergebnis/2017/20170002.htm A special thanks goes to the watch keeper during M134/1: Viola Bihler, Maximilian Grahs, Miriam Römer and Nikolas Stang