| Identifier | 2020-620-FA | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alternate names | Ofu USGS-NPS Study | ||||||||||||||
| Purpose | Investigate geophysical controls on algal outbreaks over NPS coral reefs | ||||||||||||||
| Location | Ofu, American Samoa | ||||||||||||||
| Summary | USGS Thermal Tower Reef Camera Timestack, Papaloloa, Ofu, American Samoa | ||||||||||||||
| Info derived | Investigate geophysical controls on algal outbreaks over NPS coral reefs | ||||||||||||||
| Comments | Entries for this field activity are based on entries from Field Activity 2020-601-FA Data available at doi:10.5066/P19NRBZS | ||||||||||||||
| Projects | |||||||||||||||
| Platform |
|
||||||||||||||
| Vehicles | None |
||||||||||||||
| Itinerary |
Activity events
|
||||||||||||||
| Bounds |
|
||||||||||||||
| Marine operations | Yes | ||||||||||||||
| Scuba operations | Yes |
| Organization |
2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
|
||||
|---|---|---|---|---|---|
| Principal investigators | Ferdinand K Oberle | ||||
| Crew members |
|
||||
| Information specialist(s) |
|
||||
| Affiliate principal | Eric Brown (NPS) |
| Data category: | Sampling, Electro-Magnetic, Environmental Data, Imagery |
|---|---|
| Data type: | Chemistry, Resistivity, Radon, Temperature, Tide, Wave, Other Imagery |
| Equipment | Usage description | Data types | Datasets |
|---|---|---|---|
| sampling equipment | Biology, Chemistry, Geology, Experiments (biological), Sediment Properties | 2 | |
| Supersting R8 | Resistivity | 1 | |
| CT sensor | Conductivity, Temperature | (no data reported) | |
| radonmonitor | Radon | 1 | |
| FLIR thermal camera | Other Imagery | (no data reported) |
| Dataset name | Equipment | Description | Dataset contact |
|---|---|---|---|
| Nearshore Electrical Resistivity Tomography (ERT) profile data, Ofu, American Samoa, February 2020 | Supersting R8 | Along-shore surface-based 2D electrical resistivity tomography (ERT) surveys were collected in the nearshore region of Ofu, American Samoa. | Ferdinand K Oberle |
| Nearshore seawater-column measurements of coastal groundwater discharge, Ofu, American Samoa, February 2020 | radonmonitor | In-situ nearshore seawater measurements of dissolved radon and water level were used to determine the advection rate of groundwater onto the fringing reef off Ofu, American Samoa. | Ferdinand K Oberle |
| Dataset name | Equipment | Description | Dataset contact |
|---|---|---|---|
| Water and algal chemistry measurements collected from the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit | sampling equipment | Geochemical analysis of coastal springs and possible source waters were conducted in the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit. Water samples were analyzed for dissolved nutrients, nitrate isotopes (delta-18-O and delta-15-N). Algae samples were collected and analyzed for delta-15-N and delta-13-C values. | Nancy G Prouty |
| USGS Archive of Computed tomography (CT) Scans of Coral Cores | sampling equipment | This data release presents computed tomography (CT) imagery generated from coral core samples curated within the U.S. Geological Survey (USGS) Coral-Core Archive. These data were collected as part of ongoing USGS coral-reef research activities and include samples originating from multiple locations and collection efforts. A Geotek Rotating X-ray CT (RXCT) system was used to acquire x-ray images and perform CT reconstructions of archived coral cores. The full three-dimensional CT dataset consists of individual axial slices which are reconstructed images in TIFF format. These axial slices are oriented perpendicular to the long axis of the core. Two-dimensional orthogonal views are also provided that illustrate representative downcore slabs of each core. Geotek software-proprietary XML files are provided in each folder containing axial slices and orthogonal views, containing more image-scaling and information on x-ray system settings and reconstruction parameters. This data release allows future expansions of the archive to incorporate CT imagery scanned under the same consistent methodology from additional coral cores, locations, and collection efforts. | Ferdinand K Oberle |
