This ocean-bottom seismometer deployment is part of an interdisciplinary project examining the Aurora hydrothermal vent field in an attempt to understand its fluid circulation. A total of 8 ocean bottom seismometers modified for the operation in sea ice covered oceans was deployed around Aurora vent field at the intersection of Gakkel Ridge and Lena Trough in the Fram Strait. The aim of the experiment was to monitor seismicity related to the hydrothermal circulation system and to reveal potentially heat reservoirs devoid of seismicity. The network consisted of 8 DEPAS Lobster type broadband OBS. Instruments were free-fall deployed and spaced by about 5-8 km. Their position at the seafloor is known to within few meters from ultrashort baseline positioning system Posidonia. The OBS recorded continuously at 100 Hz for up to 12 months between end of July 2022 and mid July 2023. One instrument (AUR02) had an unreliable seismometer records due to levelling problems. Skew values were obtained for all stations and ranged between -18 s and 12.3 s. Clock drift in this experiment was partially nonlinear. After the skew correction, a nonlinear time drift for stations AUR02, AUR04, AUR06, AUR08 was determined using noise cross-correlation. A best-fit correction was obtained by using skew-corrected station AUR01 as reference station for stations AUR04 and AUR08, while skew-corrected station AUR03 served as reference for stations AUR02 and AUR06. Station specific phase residuals obtained from a manually picked catalog of 492 events were used to further validate the clock drift corrections. For AUR04 a nonlinear phase residual drift was observed and, subsequently, the applied drift polynomial was manually adjusted to minimize resulting residuals. Waveform data are available from the GEOFON data centre under network code 4V.
The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems, which was undergoing testing during this cruise. In this dataset seabed photos from a height of approximately 60 cm from the seafloor, depicting an area of approximately 1.5 m**2, with variations depending on the actual height above ground of the system. Conditions were not optimal, with many particles in the water and considerable ship heave. 5 deployments were made during HE502, with all timestamped images collected uploaded here.
Seegraswiesen erfüllen wichtige ökologische Dienstleistungen z.B. bei der Sequestrierung von Kohlenstoff, im Bereich von Nährstoffkreisläufen und -filterung sowie bei der Stabilisierung von Sedimenten. Seegraswiesen sind jedoch weltweit durch menschliche Aktivitäten entweder direkt (z.B. durch Gewässerverschmutzung, Habitatzerstörung) oder indirekt, durch sich verändernde Umweltbedingungen, (z.B. erhöhte Wassertemperaturen) stark gefährdet. Eine Schädigung von Seegraswiesen beeinflusst sowohl wichtige ökologische Funktionen als auch assoziierte Dienstleistungen wie z.B. die Primärproduktion und Kohlenstoffsequestrierung sowie den Schutz der Küsten vor Erosion und Bereitstellung von Habitaten für wichtige Fischbestände. Projektziele sind die Untersuchung der Reaktion von zwei Seegrasarten (Halophila stipulacea und Posidonia oceanica) auf zunehmende Wassertemperatur und küstennahe Nährstoffkonzentration, um frühe Warnsignale bereitzustellen mit denen Veränderungen erkannt werden können, lange bevor Zerstörungen irreversibel werden. P. oceanica ist hochproduktiv und kommt entlang der Küsten im gesamten Mittelmeerbereich (1. Untersuchungsgebiet, Küste vor Neapel) vor, ist jedoch auch sehr empfindlich in Bezug auf Störungen und Eutrophierungsprozesse. Das tropische Seegrass H. stipulacea dominiert in der nördlichen Spitze des Golfs von Akaba (2. Untersuchungsgebiet). In beiden Untersuchungsgebieten befinden sich die Seegraswiesen in der Nähe von intensiven Küstenentwicklungen mit erwarteten erhöhten Nährstoffeinträgen. Das Projekt führt Feldexperimente in beiden Regionen durch, um die Reaktion der Seegraswiesen auf erhöhte Nährstoffbelastungen in situ im saisonalen Temperaturverlauf zu untersuchen. Die Ergebnisse werden für die Spezifikation eines ökologischen Simulationsmodells genutzt, um treibenden Kräfte zu analysieren und Implikationen für ein Management abzuleiten.
The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems, which was undergoing testing during this cruise. In this dataset seabed photos from a height of approximately 60 cm from the seafloor, depicting an area of approximately 1.5 m**2, with variations depending on the actual height above ground of the system. Conditions were not optimal, with many particles in the water and considerable ship heave.
The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems, which was undergoing testing during this cruise. In this dataset seabed photos from a height of approximately 60 cm from the seafloor, depicting an area of approximately 1.5 m**2, with variations depending on the actual height above ground of the system. Conditions were not optimal, with many particles in the water and considerable ship heave.
The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems, which was undergoing testing during this cruise. In this dataset seabed photos from a height of approximately 60 cm from the seafloor, depicting an area of approximately 1.5 m**2, with variations depending on the actual height above ground of the system. Conditions were not optimal, with many particles in the water and considerable ship heave.
The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems, which was undergoing testing during this cruise. In this dataset seabed photos from a height of approximately 60 cm from the seafloor, depicting an area of approximately 1.5 m**2, with variations depending on the actual height above ground of the system. Conditions were not optimal, with many particles in the water and considerable ship heave.
The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems, which was undergoing testing during this cruise. In this dataset seabed photos from a height of approximately 60 cm from the seafloor, depicting an area of approximately 1.5 m**2, with variations depending on the actual height above ground of the system. Conditions were not optimal, with many particles in the water and considerable ship heave.
TableOfContents
Dieser Eingabe-Datensatz beinhaltet die einzelnen stratigraphischen Horizonte des dynamischen KW-Modells vom Nordwesten der deutschen Nordsee, dem sogenannten Entenschnabel in Form von Tiefenkarten. Die benötigten Erosionsevents wurden in das Modell mit den entsprechenden Erosionskarten eingebaut. Der Salzaufstieg wird berücksichtigt und es wurden petrophysikalische Eigenschaften sowie organisch-geochemische Werte und Reaktionskinetiken für die Berechnung der Reife und der Kohlenwasserstoffgenese der Petroleummuttergesteine im Modell zugewiesen. Insgesamt werden drei potenzielle Muttergesteine, davon eins aus dem unteren Karbon (Namur-Viséan) und zwei weitere aus dem unteren Jura (Posidonia Shale) und dem oberen Jura (Hot Shale), untersucht. Die Kalibrationsdaten, wie die Vitrinitreflexion und Temperatur, wurden eingefügt. Randbedingungen wie die Paläowassertiefe (PWD), die Temperatur an der Sediment-Wasser-Grenzfläche (SWIT) sowie der basale Wärmefluss (HF), welcher für die Rekonstruktion der thermischen Geschichte verwendet werden kann, sind in das 3D-Modell integriert. Das Modell kann numerisch simuliert werden und liefert erste Aussagen zur Reife möglicher Petroleummuttergesteine. Das 3D-Modell wurde mit dem Software-Paket PetroMod, Schlumberger Version 2014.1 erstellt und nach 2015.1 und 2016.1 konvertiert.
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