Hole 1255A CORK borehole observatory pressure and seafloor temperature time series from the Costa Rica Subduction Zone

These pressure and temperature time series were retrieved from a CORK-II borehole observatory, 1255A, off Costa Rica. The CORK-II instruments comprised an RBR Ltd data logger and Paroscientific pressure sensors, model 8B-7000-2. The data files are in ASCII format and contain pressure values measured at 10-minute intervals at the seafloor and at two levels in the formation, and temperature values measured hourly at the seafloor. Ocean Drilling Program (ODP) Hole 1255A is located in the outer subduction prism, rougly 800 m landward of its companion Hole 1253A. Installations were completed in 2002 during ODP Leg 205 (Morris et al., 2003). The pressure data file format contains columns giving the date (yy/mm/dd) and time (HH:MM:SS, UTC), and pressures (kPa) in sequence from the deepest formation-zone gauge (S1), a gauge at an intermediate depth level (S2), up to the seafloor gauge (SF). See Jannasch et al., 2003 for details. The temperature data file contains date (yy/mm/dd) and time (HH:MM:SS, UTC), counts (output of the A/D converter) and temperature (°C) at the seafloor. Counts are converted to temperatures using the following equation:temperature=6.46804301E-14*(counts^2) - 5.56269844E-6*counts + 44.1103 + 0.377. The coefficients for the conversion are based on the data sheet of the used temperature sensors (thermistors). See Jannasch et al., 2003 for details. For information about clock checks, data disruptions and hydrostatic corrections, please refer to the associated document called "CRM_CORKs_ExplanatoryNotes.pdf". The data set was generated as part of the projects called "Long-term Continuous Monitoring of Pressure, Fluid Chemistry, and Hydrology in Instrumented Boreholes at the Costa Rica Subduction Zone" and "Discovery, sampling, and quantification of flows from cool yet massive ridge-flank hydrothermal springs on Dorado Outcrop, eastern Pacific Ocean". Funding for this work was provided by NSF awards OCE01-18478 and OCE11-30146 and DFG grant number VI 133/4-2.