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OAS accession Detail for 0203764
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| accessions_id: | 0203764 | archive |
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| Title: | National Centers Coastal Ocean Science (NCCOS) Monitoring: Six-minute water level, temperature, and salinity data from Marine Corps Base Camp Lejeune (MCBCL), Jacksonville, NC, 2008-02-21 to 2018-11-06 (NCEI Accession 0203764) |
| Abstract: | This dataset is an inventory of 6-minute water level, water salinity, and water temperature data from two secondary water level stations at Marine Corps Base Camp Lejeune (MCBCL), Jacksonville, NC, collected between 2008 and 2018. The Mile Hammock Bay (MHB) water level station (CO-OPS # 8657098), located at 34.55388N, 77.326181W, on the west bulkhead of the MHB basin and approximately 3 km northeast of the New River inlet, was established on February 21, 2008, by NOAA and decommissioned on November 6, 2018. The Gottschalk Marina Wallace Creek (GMWC) water level station (CO-OPS # 8656648), located at 34.67723N, 77.362721W, on the west corner of the marina dock approximately 16.5 km north of the New River inlet, became operational on May 15, 2008, ceased operation on August 26, 2016, and was decommissioned on September 12, 2016. Water level was measured in meters above the sensor and adjusted to meters NAVD 88 using methods described in Hilting et al., 2019. Water salinity was measured on the unitless practical salinity scale, and temperature was measured in degrees Celsius. |
| Date received: | 20190927 |
| Start date: | 20080221 |
| End date: | 20181106 |
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| West boundary: | -77.362721 |
| East boundary: | -77.326181 |
| North boundary: | 34.67723 |
| South boundary: | 34.55388 |
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| Submitter: | |
| Submitting institution: | US DOC; NOAA; NOS; National Centers for Coastal Ocean Science |
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| Supplementary information: | Methods: Six Yellow Springs Instrument (YSI) 600LS vented sondes were interchanged approximately every 5 months at each station. Sonde data were downloaded every 1-2 months and compiled for each sonde deployment. Sondes were calibrated prior to deployment, checked for drift post-deployment, and serviced regularly by YSI. Some drift in water level calibration did occur, contributing to systematic error over the deployment and random error over the time series. Drift in time occurred most frequently, with a gain or loss of 1-2 minutes over a deployment. Water level data recorded relative to the sonde depth were adjusted to m NAVD88 using methods described in Hilting et al., 2019. The compiled deployment data of each secondary station were compared to each other and to the National Water Level Observation Network (NWLON) station in Beaufort, NC, (#8656483) for consistency in their relative trends. This comparison helped identify the exact timing of a shift in sensor elevation due to a boat strike, for example, and decoupling of the exterior pipe and the backing board (Hilting et al., 2019). Data with uncertain sensor elevation were removed. Large gaps (> 3 hrs) in the record also resulted from battery failures or sensor malfunction. Once reviewed for quality control, the water level data from each sonde deployment at each station were compiled into a master database and gaps Water level data were collected from May 15, 2008, to August 26, 2016, at Gottschalk Marina Wallace Creek (GMWC) (8.3 years) with a gap of 6 days starting May 27, 2016. Continuous data span a full 8 years at GMWC. There was a 6-day gap (5/27/16-6/2/16) at GMWC in water level data due to instrument failure or disturbance. At Mile Hammock Bay (MHB), where eight gaps of 7 to 61 days occurred between February 21, 2008, and November 6, 2018 (10.7 years of data collection), the longest continuous record was from February 27, 2013, to December 24, 2016 (1396 days or 3.8 years). There were eight large gaps (7-84 days duration) at MHB in water level data due to instrument failure or disturbance: 2/29/08-4/10/08, 6/22/09-7/31/09, 10/20/11-12/7/11, 2/14/13-2/27/13, 12/24/2016-1/4/2017, 1/28/2017-3/30/2017, 8/2/2018- 8/9/2018, and 9/10/2018-9/26/2018. Temporal gaps in the water salinity and water temperature data were not interpolated but adjustments were made to the recorded date and time to by adding or subtracting up to 2 minutes in order to provide data on the exact 6 minute increment. Both the original recorded date and time, and the adjusted date and time are provided. For detailed methodology see Hilting et al., 2019. A summary of the number of gaps of different periods of duration in the record is in Table 1. The start time and duration of gaps > 3 hours in MHB and GMWC water temperature and water salinity are provided in Table 2. Table 1: Water Temperature and Salinity Data Gap Summary Gap Duration Station Temperature Gaps (n) Salinity Gaps (n) 3 hours MHB 7 8 Total # gaps MHB 117 113 3 hours GMWC 2 2 Total # gaps GMWC 79 80 Table 2: Water Temperature and Salinity Data Gaps Greater than 3 Hours Gap start time (EST) Station Gap > 3 hours duration (days) Temperature Salinity 2/29/2008 11:18 MHB 41.2 x x 5/9/2012 8:12 MHB 113.1 x 2/14/2013 5:42 MHB 13.4 x x 9/10/2014 13:06 MHB 0.1 x x 12/24/2016 22:24 MHB 10.6 x x 1/28/2017 12:24 MHB 59.9 x x 10/12/2017 8:48 MHB 53.3 x x 8/2/2018 19:48 MHB 6.6 x x 9/4/14 13:24 GMWC 0.2 x x 6/2/16 14:42 GMWC 6.3 x x Submission Package ID: 2DUAPU |
| Availability date: | |
| Metadata version: | 4 |
| Keydate: | 2019-09-27 19:10:08+00 |
| Editdate: | 2019-09-30 20:14:32+00 |