Download URLhttps://www.bco-dmo.org/dataset/555391/data/download
Media Type text/tab-separated-values
Created April 6, 2015
Modified February 16, 2018
Brief Description

North Pond CORKs dissolved oxygen concentrations collected during ROV Jason-II dives.

Acquisition Description

During fluid sampling from IODP CORK (CirculationObviationRetrofitKit) Observatories, an Aanderaa oxygen optode collected in situ dissolved oxygen concentrations and fluid temperature. Details for sampling instrumentation are provided in:
Cowen, J.P., Copson, D., Jolly, J., Hsieh, C.-C., Matsumoto, R., Glazer, B.T. et al. 2012. Advanced instrument system for real-time and time-series microbial geochemical sampling of the deep (basaltic) crustal biosphere. Deep-Sea Research I, 61: 43-56. doi:10.1016/j.dsr.2011.11.004

This dataset is currently being used to produce forthcoming manuscripts for additional publications.

Processing Description

BCO-DMO edits:
– Modified column headers to conform to BCO-DMO naming conventions.
– Removed rows contatining no data (corrupted data and timeout errors) from the data files.


Aanderaa optodes [Aanderaa Oxygen Optodes]
Aanderaa Oxygen Optodes are instrument for monitoring oxygen in the environment. For instrument information see the Aanderaa Oxygen Optodes Product Brochure.


cruise_id [cruise_id]
Cruise identifier.
cruise designation; name
year [year]
4-digit year.

year, reported as YYYY, e.g. 1995

day [day]
2-digit day of month.
day of month; numeric 1 to 31
month [month]

2-digit month of year.

Month of year; numeric 1 to 12.

time [time]
Time of sampling in hours, minutes, and decimal minutes.
Time GMT defined as HHMM; time of day; generally reported in GMT as HHMM (hours and minutes) but may also be HH.H (decimal hours) or HHMMSS (hours; minutes and seconds); in EqPac time is reported as Hawaii local time
Oxygen (O2) concentration.

dissolved oxygen concentration

air_sat_pcnt [unknown]
Percent air saturation.
association with a community-wide standard parameter is not yet defined
temp [temperature]
water temperature at measurement depth
cal_phase [unknown]
association with a community-wide standard parameter is not yet defined
TC_phase [unknown]
association with a community-wide standard parameter is not yet defined
C1RPh [unknown]
association with a community-wide standard parameter is not yet defined
C2RPh [unknown]
association with a community-wide standard parameter is not yet defined
C1Amp [unknown]
association with a community-wide standard parameter is not yet defined
C2Amp [unknown]
association with a community-wide standard parameter is not yet defined
raw_temp_mV [unknown]
Raw temperature (voltage).
association with a community-wide standard parameter is not yet defined
ISO_DateTime [unknown]
Date and time formatted to ISO8601 standard. T represents the start of the time string.
association with a community-wide standard parameter is not yet defined

Dataset Maintainers

Brian T. GlazerUniversity of Hawaii at Manoa (SOEST)
Julie A. HuberUniversity of Hawaii at Manoa (SOEST)
Peter R. GirguisMarine Biological Laboratory (MBL)
Shannon RauchMarine Biological Laboratory (MBL)
Shannon RauchWoods Hole Oceanographic Institution (WHOI BCO-DMO)

BCO-DMO Project Info

Project Title Collaborative Research: Characterization of Microbial Transformations in Basement Fluids, from Genes to Geochemical Cycling
Acronym North Pond Microbes
Created April 3, 2015
Modified August 29, 2019
Project Description

Description from NSF award abstract:
Current estimates suggest that the volume of ocean crust capable of sustaining life is comparable in magnitude to that of the oceans. To date, there is little understanding of the composition or functional capacity of microbial communities in the sub-seafloor, or their influence on the chemistry of the oceans and subsequent consequences for global biogeochemical cycles. This project focuses on understanding the relationship between microbial communities and fluid chemistry in young crustal fluids that are responsible for the transport of energy, nutrients, and organisms in the crust. Specifically, the PIs will couple microbial activity measurements, including autotrophic carbon, nitrogen and sulfur metabolisms as well as mineral oxide reduction, with quantitative assessments of functional gene expression and geochemical transformations in basement fluids. Through a comprehensive suite of in situ and shipboard analyses, this research will yield cross-disciplinary advances in our understanding of the microbial ecology and geochemistry of the sub-seafloor biosphere. The focus of the effort is at North Pond, an isolated sediment pond located on ridge flank oceanic crust 7-8 million years old on the western side of the Mid-Atlantic Ridge. North Pond is currently the target for drilling on IODP expedition 336, during which it will be instrumented with three sub-seafloor basement observatories.

The project will leverage this opportunity for targeted and distinct sampling at North Pond on two German-US research cruises to accomplish three main objectives:

1. to determine if different basement fluid horizons across North Pond host distinct microbial communities and chemical milieus and the degree to which they change over a two-year post-drilling period.

2. to quantify the extent of autotrophic metabolism via microbially-mediated transformations in carbon, nitrogen, and sulfur species in basement fluids at North Pond.

3. to determine the extent of suspended particulate mineral oxides in basement fluids at North Pond and to characterize their role as oxidants for fluid-hosted microbial communities.

Specific outcomes include quantitative assessments of microbial activity and gene expression as well as geochemical transformations. The program builds on the integrative research goals for North Pond and will provide important data for guiding the development of that and future deep biosphere research programs. Results will increase understanding of microbial life and chemistry in young oceanic crust as well as provide new insights into controls on the distribution and activity of marine microbial communities throughout the worlds oceans.

There are no data about microbial communities in ubiquitous cold, oceanic crust, the emphasis of the proposed work. This is an interdisciplinary project at the interface of microbial ecology, chemistry, and deep-sea oceanography with direct links to international and national research and educational organizations.

Data Project Maintainers
Julie A. HuberMarine Biological Laboratory (MBL)Lead Principal Investigator
Peter R. GirguisHarvard UniversityPrincipal Investigator
Brian T. GlazerUniversity of Hawaii at Manoa (SOEST)Principal Investigator