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OAS accession Detail for 0277424
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| accessions_id: | 0277424 | archive |
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| Title: | Measurements of light intensity (PAR) underwater (19 m depth) in St. John, US Virgin Islands from 2014-2017 (NCEI Accession 0277424) |
| Abstract: | This dataset contains physical data collected at Virgin Islands National Park during deployment Edmunds_VINP from 2014-08-23 to 2017-07-28. These data include PAR_photons. The instruments used to collect these data include LI-COR Biospherical PAR Sensor. These data were collected by Dr Peter J Edmunds of California State University Northridge as part of the "Ecology and functional biology of octocoral communities (VI Octocorals)" and "RUI-LTREB Renewal: Three decades of coral reef community dynamics in St. John, USVI: 2014-2019 (RUI-LTREB)" projects. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2023-01-23. The following is the text of the dataset description provided by BCO-DMO: Measurements of light intensity (PAR) underwater (19 m depth) in St. John, US Virgin Islands from 2014-2017. Dataset Description: Measurements of light intensity (PAR) underwater (19 m depth) in St. John, US Virgin Islands from 2014-2017. |
| Date received: | 20230123 |
| Start date: | 20140823 |
| End date: | 20170728 |
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| West boundary: | -64.725975 |
| East boundary: | -64.725975 |
| North boundary: | 18.314604 |
| South boundary: | 18.314604 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: Light was measured as the radiant energy between 400 and 700 nm wavelength (i.e., PAR, μmol quanta m-2 s-1) as Photosynthetic Photon Flux Density (PPFD). In situ light was measured using two logging meters fitted with a cosine-corrected PAR sensor and wiper (Compact LW, JFE Advantech Co., Ltd, Japan), that were deployed at ~ 19.1-m depth (height of the sensor) in Great Lameshur Bay (18° 18 ́ 37.04N, 63° 43 ́ 23.17W). These instruments recorded downwelling PAR, and were deployed six times from 2014and 2017, from August to March and from March to August. The meters were operated in burst mode, during which they would wake up, clean the sensor with a wiper, and record a burst of multiple records before returning to sleep. The Compact LW meter is designed for oceanographic applications to 200 m depths, is fitted with a photodiode sensor, and has a stated accuracy of ± 4% (over 0–2000 μmol photons m2 s-1) and resolution of 0.1 μmol photons m2 s-1. Both meters were purchased new for this study, and were deployed individually and sequentially between field samplings with comparisons between consecutive deployments used to screen for calibration drift. One sensor was used for a combined duration of 16 months during, and the other sensor was used for 4 months, returned to the manufacturer for servicing (May 2016), and then used again for 3 months. In between deployments, sensors were inspected for abrasions that would affect calibration, and were carefully cleaned with vinegar. Different configurations of the meter were employed to prolong battery life. In the first and second deployments (starting 21 August 2014 and 19 March 2015, respectively), a burst of 10 measurements was recorded at 0.033 Hz (i.e., every 30 s) every 1.5 h; the instrument failed during the third deployment (starting August 2015); in the fourth and fifth deployments (starting 16 March 2016 and 29 July 2016, respectively) a burst of 10 measurements was recorded at 0.033 Hz every 1.0 h; and in the sixth deployment(starting 23 February 2017) a burst of 30 measurements was recorded at 0.100 Hz (i.e.,every 10 s) every 2.0 h. The timing of bursts was not standardized to local time and, therefore, the number and timing of bursts bracketing noon (which were used to calculate transmission, described below) differed among deployments. The sampling frequency within each burst was sufficient to alleviate the bias resulting from wave-induced light flecking (Zheng et al. 2002). As a result of varying power demands of each sampling configuration, the meter did not always record for the full duration of each deployment. |
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| Metadata version: | 1 |
| Keydate: | 2023-04-03 05:36:28+00 |
| Editdate: | 2023-04-03 05:37:47+00 |