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18 results for “Seaglider”
Multiple years of Seaglider observations of hydrography, dissolved oxygen, chlorophyll a, and optical backscatter at Station ALOHA
<p><strong>File descriptions:</strong></p> <p>Seaglider missions are identified as GLIDER_MISSION<em> </em>(i.e. sg148_12 is glider 148, mission 12) and each have three files associated. For example:</p> <ol> <li><strong>sg148_12_qc_pass.xlsx</strong> contains only quality controlled (QC flags = 1) core data for an entire mission. Core data may include temperature, conductivity, salinity, potential density anomaly, calibrated dissolved oxygen concentrations, calibrated chlorophyll <em>a</em> concentrations, and the backscattering coefficient due to particles (bbp) at up to three wavelengths (470, either 650 or 660, and 700 nm) and spike flags. Bbp data is corrected with an <em>in situ</em> dark subtraction from near 200 m deep. Associated metadata (datetime, latitude, longitude, depth, dive number, and vertical profile direction) is also included.</li> <li><strong>sg148_12_alldata.nc </strong>contains all data (i.e. all QC flag levels) and associated quality control flags. In addition to core and metadata, factory-only calibrated observations (e.g. dissolved oxygen concentrations, chlorophyll <em>a</em> concentrations, and bbp) are listed. </li> <li><strong>sg148_12_qctests.nc</strong><em> </em>contains all quality control test values (pass: QC = 1, input flag: QC = 2, questionable data QC = 3, bad data: QC = 4). The maximum test QC flag value (e.g. out of range, density inversions, bioflouling, etc.) was passed to the variable QC flag (e.g chla_qcflag or salin_qcflag). . </li> </ol> <p> </p> <p><strong>Dataset description:</strong></p> <p>The SCOPE-ALOHA Seaglider dataset was designed to monitor the spatial and temporal variability of physical and biogeochemical properties around the long term sampling site Station ALOHA (22°45′N, 158°W). Seagliders are autonomous underwater vehicles that take high frequency (up to 0.2 Hz in our dataset), depth-resolved observations over several months and can be used to map large spatial features. The gliders depicted in this study were equipped with sensors to measure temperature, salinity, pressure, dissolved oxygen concentration (O2), chlorophyll a concentration (Chl a) from fluorescence (excitation/emission lambda = 470/695 nm), and the particulate backscattering coefficient (bbp) at three wavelengths (lambda = 470 nm, 700 nm, and either 650 or 660 nm depending upon mission). Vertical profiles down to at least 200 m were collected for all sensors over periods of several months per mission. This dataset comprises 18 missions between 2008 and 2023 centered on Station ALOHA, totaling over 20,000 depth profiles. Chlorophyll <em>a</em> and oxygen concentrations are calibrated with discrete observations. Particulate backscattering coefficients are corrected with an additional dark subtraction. This dataset is an improvement on the raw data files as they are quality controlled, calibrated, and corrected.</p> <p>Raw data files can be found at https://hahana.soest.hawaii.edu/seagliders/index.php.</p> <p>version notes:</p> <p>v1.0 original</p> <p>v1.1 Metaadata tab on xlsx files edited, no change to data</p> <p>v1.2 fixed error: variable qc flags added to alldata.nc files</p> <p>v1.3 Added error estimates and CF_standard_name to alldata.nc files</p> <p><strong>Methods:</strong></p> <p><em><strong>Code for all processing steps is on GitHub </strong></em><strong>(</strong><em><strong>https://github.com/cathygarcia/SeagliderDataprocessing</strong></em><strong>)</strong><em><strong>.</strong> The steps listed here are a brief summary. </em></p> <p><em>Temperature, Conductivity, Salinity, and Potential Density Anomaly</em></p> <ul> <li>Both temperature and conductivity profiles were lag corrected.</li> <li>Practical salinity was calculated using the Gibbs Seawater Toolbox (gsw_SP_from_C.m), and then converted to absolute salinity (gsw_SA_from_SP.m). </li> <li>Potential density anomaly was calculated with respect to a reference water pressure of 0 db using the Gibbs Seawater Toolbox (gsw_sigma0.m).</li> </ul> <p><em>Dissolved oxygen concentrations</em></p> <ul> <li>Raw optode phase values proceeded through a series of corrections to account for the effects of temperature, salinity, pressure, and time response in addition to sensor drift (Bittig et al., 2018, Barone et al., 2019).</li> <li> Optode phase values were converted to dissolved oxygen concentrations, and re-calibrated using discrete Winkler measurements. </li> </ul> <p><em>Chlorophyll</em> <em>a</em></p> <ul> <li>Factory-calibrated chlorophyll <em>a</em> observations were re-calibrated using discrete measurements of either HPLC chlorophyll <em>a </em>(16 missions) or fluorometric chlorophyll <em>a</em> (2 missions).</li> <li>Daytime chlorophyll <em>a</em> values are not quench corrected, and may be lower than actual values. It is recommended to use nighttime profiles near the surface. </li> <li>Additionally, a spike flag is included based on published protocol (Briggs et al., 2011).</li> </ul> <p><em>Backscattering coefficient due to particles (bbp)</em></p> <ul> <li>Factory-calibrated bbp values could have a large offset, that was not expected based on natural variability.</li> <li>A mission-specific deep dark correction (1st percentile of bbp at 190-200 m) was subtracted for each bbp dataset. Both the uncorrected and corrected data are available.</li> <li>Additionally, a spike flag is included based on published protocol (Briggs et al., 2011).</li> </ul> <p> </p>
KM2112 SCOPE-PARAGON cruise, Seaglider 513, Mission 11
<p>The 2021 SCOPE-PARAGON research expedition is a coordinated effort to characterize particle dynamics and remineralization in the upper 500 m of the North Pacific Subtropical Gyre. Despite the importance of particles as key sites of biological activity in an otherwise dilute seawater medium, there remain major gaps in our understanding of the specific processes and organisms controlling particle transformations. The 2021 SCOPE-PARAGON cruise will be directed towards understanding the processes and rates of biological particulate matter transformations (e.g., production, decomposition, sinking) as well as the ecological interactions that occur in association with suspended and sinking particles. These targeted studies of particle dynamics at Station ALOHA will leverage ongoing ecological and biogeochemical modeling efforts in SCOPE.</p>
KM2209 SCOPE-PARAGON 2 cruise, Seaglider 513, Mission 13
<p>The 2022 SCOPE-PARAGON II research expedition is a coordinated effort to characterize particle dynamics and remineralization in the upper 500 m of the North Pacific Subtropical Gyre. Despite the importance of particles as key sites of biological activity in an otherwise dilute seawater medium, there remain major gaps in our understanding of the specific processes and organisms controlling particle transformations. The 2022 SCOPE-PARAGON II cruise will be directed towards understanding the processes and rates of biological particulate matter transformations (e.g., production, decomposition, sinking) as well as the ecological interactions that occur in association with suspended and sinking particles. These targeted studies of particle dynamics at Station ALOHA will leverage ongoing ecological and biogeochemical modeling efforts in SCOPE.</p>
KM2112 SCOPE-PARAGON cruise, Seaglider 626, Mission 3
<p>The 2021 SCOPE-PARAGON research expedition is a coordinated effort to characterize particle dynamics and remineralization in the upper 500 m of the North Pacific Subtropical Gyre. Despite the importance of particles as key sites of biological activity in an otherwise dilute seawater medium, there remain major gaps in our understanding of the specific processes and organisms controlling particle transformations. The 2021 SCOPE-PARAGON cruise will be directed towards understanding the processes and rates of biological particulate matter transformations (e.g., production, decomposition, sinking) as well as the ecological interactions that occur in association with suspended and sinking particles. These targeted studies of particle dynamics at Station ALOHA will leverage ongoing ecological and biogeochemical modeling efforts in SCOPE.</p>
KM2112 SCOPE-PARAGON cruise, Seaglider 511, Mission 20
<p>The 2021 SCOPE-PARAGON research expedition is a coordinated effort to characterize particle dynamics and remineralization in the upper 500 m of the North Pacific Subtropical Gyre. Despite the importance of particles as key sites of biological activity in an otherwise dilute seawater medium, there remain major gaps in our understanding of the specific processes and organisms controlling particle transformations. The 2021 SCOPE-PARAGON cruise will be directed towards understanding the processes and rates of biological particulate matter transformations (e.g., production, decomposition, sinking) as well as the ecological interactions that occur in association with suspended and sinking particles. These targeted studies of particle dynamics at Station ALOHA will leverage ongoing ecological and biogeochemical modeling efforts in SCOPE.</p>
Seaglider (SG537) dataset collected during the ROAM-MIZ field campaign in the Southern Ocean
<p>This dataset is a part of the Robotic Observations And Modelling in the Marginal Ice Zone (ROAM-MIZ, <a href="http://www.roammiz.com">www.roammiz.com</a>) project, and contains the temperature and salinity profiles from a Seaglider (SG537), which was deployed at the Prime Meridian in the northeastern Weddell Sea (0.00W and 55S) from 18th October 2019 to 18th February 2020 and obtained a total of five repeated crossings of the Southern Boundary.</p>
FK180310 SCOPE-Falkor cruise, Seaglider 626, Mission 2
<p>The SCOPE-Falkor cruise was a month long expedition, primarily to conduct mapping of the deep chlorophyll maximum (DCM) within a mesoscale cyclonic eddy. The procedure was to utilize two Long Range Autonomous Vehicles (AUVs) near the center of the eddy and to capture the microbial ecology within the DCM over several diel cycles. Two autonomous Seagliders, sg148 (mission 15) and sg626 (mission 2) were deployed along the exterior boundary of the cyclonic eddy to conduct spatial surveys of salinity, chlorophyll, optics, and oxygen, diving generally from 200 to 600 meters depth. Since the R/V Falkor and the LRAUVs would be drifting near each other and sampling close to the center of the cyclonic eddy, both Seagliders were to give the regional context by simultaneously traversing the margin of the eastern edge of the cyclonic eddy and western edge of the anti-cyclonic eddy.</p>
Seaglider (SG640) dataset collected during the ROAM-MIZ field campaign in the Southern Ocean
<p>This dataset is a part of the Robotic Observations And Modelling in the Marginal Ice Zone (ROAM-MIZ, <a href="http://www.roammiz.com">www.roammiz.com</a>) project and contains the temperature, salinity, dissolved oxygen, fluorescence, and backscatter profiles from a Seaglider (SG640), which was deployed at the Prime Meridian in the northeastern Weddell Sea (0.02W and 55.01S) from 20th October 2019 to 18th February 2020.</p> <p>The raw data has been processed to L1 by applying the Kongsberg Seaglider Basestation code following the methods of Garau et al. (2011).</p> <p>Garau, B., S. Ruiz, W. G. Zhang, A. Pascual, E. Heslop, J. Kerfoot, and J. Tintoré, 2011: Thermal Lag Correction on Slocum CTD Glider, <em>Data. J. Atmos. Oceanic Technol</em>, 28, 1065–1071. DOI: <a href="https://doi.org/10.1175/JTECH-D-10-05030.1">https://doi.org/10.1175/JTECH-D-10-05030.1</a></p>
FK180310 SCOPE-Falkor cruise, Seaglider 148, Mission 15
<p>The SCOPE-Falkor cruise was a month long expedition, primarily to conduct mapping of the deep chlorophyll maximum (DCM) within a mesoscale cyclonic eddy. The procedure was to utilize two Long Range Autonomous Vehicles (AUVs) near the center of the eddy and to capture the microbial ecology within the DCM over several diel cycles. Two autonomous Seagliders, sg148 (mission 15) and sg626 (mission 2) were deployed along the exterior boundary of the cyclonic eddy to conduct spatial surveys of salinity, chlorophyll, optics, and oxygen, diving generally from 200 to 600 meters depth. Since the R/V Falkor and the LRAUVs would be drifting near each other and sampling close to the center of the cyclonic eddy, both Seagliders were to give the regional context by simultaneously traversing the margin of the eastern edge of the cyclonic eddy and western edge of the anti-cyclonic eddy.</p>
KOK1806 HOT-LAVA cruise, Seaglider 512, Mission 9
<p>The HOT-LAVA mission was a rare opportunity to quickly survey and sample the biogeochemical changes and ecological variability of the ocean off the south east coast of Hawaii when it was perturbed by lava pouring into the sea. Seaglider sg512 (mission 9), was deployed the first day to conduct transects to the south ahead of the R/V KOK and along the axis of the satellite imagery showing a chlorophyll bloom. Its goal was to survey and provide reconnaissance for the ship's science personnel to ground truth the satellite's higher surface expression of chlorophyll and hopefully provide better station locations for sampling. Subsequent to the cruise, it was to continue collecting data corresponding to the satellite imagery and monitor the longer regional changes due to the outflow of the lava into the ocean. This<br> mission was prematurely shortened due to a malfunctioning depth pressure sensor, necessitating an early recovery.</p>
Physical oceanography captured by PolarFront Seaglider SG644 in 2023-08
<p>Seaglider SG644 was deployed from 18 to 25 August, 2023 (for details, see the <a href="https://doi.org/10.5281/zenodo.10014336">Cruise Report</a> https://doi.org/10.5281/zenodo.10014336</p> <p>Sibling datasets from the same deployment:</p> <ul> <li><a href="https://doi.org/10.5281/zenodo.13946034">EK80</a>: https://doi.org/10.5281/zenodo.13946034</li> <li><a href="https://doi.org/10.5281/zenodo.10041063">UVP6</a>: https://doi.org/10.5281/zenodo.10041063</li> </ul>
EK80 from PolarFront seaglider SG644 2023-08-18/2023-08-25
<p>Seaglider SG644 was deployed from 18 to 25 August, 2023 (for details, see the <a href="https://doi.org/10.5281/zenodo.10014336">Cruise Report</a>: https://doi.org/10.5281/zenodo.10014336</p> <p>Sibling datasets from the same deployment:</p> <ul> <li><a href="https://doi.org/10.5281/zenodo.13947021">Physical oceanography</a>: https://doi.org/10.5281/zenodo.13947021</li> <li><a href="https://doi.org/10.5281/zenodo.10041063">UVP6</a>: https://doi.org/10.5281/zenodo.10041063</li> </ul>
SPURS-2 Seaglider data for the E. Tropical Pacific field campaign
The SPURS (Salinity Processes in the Upper Ocean Regional Study) project is a NASA-funded oceanographic process study and associated field program that aim to elucidate key mechanisms responsible for near-surface salinity variations in the oceans. The project is comprised of two field campaigns and a series of cruises in regions of the Atlantic and Pacific Oceans exhibiting salinity extremes. SPURS employs a suite of state-of-the-art in-situ sampling technologies that, combined with remotely sensed salinity fields from the Aquarius/SAC-D, SMAP and SMOS satellites, provide a detailed characterization of salinity structure over a continuum of spatio-temporal scales. The SPURS-2 campaign involved two month-long cruises by the R/V Revelle in August 2016 and October 2017 combined with complementary sampling on a more continuous basis over this period by the schooner Lady Amber. Focused around a central mooring located near 10N,125W, the objective of SPURS-2 was to study the dynamics of the rainfall-dominated surface ocean at the western edge of the eastern Pacific fresh pool subject to high seasonal variability and strong zonal flows associated with the North Equatorial Current and Countercurrent. The Seaglider is an autonomous profiler measuring salinity and temperature. A total of five Seagliders were deployed over the two SPURS2 cruises. Three Seagliders were deployed on the first Revelle cruise in August 2016, recovered by the Lady Amber after 7 months and redeployed, to be retrieved finally during the second cruise in November 2017. One of the Seagliders was deployed alongside and tracked the Lagrangian array across the study region, diving to depths of 1000m. All Seaglider data files are in netCDF format with standards compliant metadata.
Adaptive Sampling of Rain and Ocean Salinity from Autonomous Seagliders (Guam 2019-2020)
This dataset was produced by the Adaptive Sampling of Rain and Ocean Salinity from Autonomous Seagliders (NASA grant NNX17AK07G) project, an investigation to develop tools and strategies to better measure the structure and variability of upper-ocean salinity in rain-dominated environments. From October 2019 to January 2020, three Seagliders were deployed near Guam (14°N 144°E). The Seaglider is an autonomous profiler measuring salinity and temperature in the upper ocean. The three gliders sampled in an adaptive formation to capture the patchiness of the rain and the corresponding oceanic response in real time. The location was chosen because of the likelihood of intense tropical rain events and the availability of a NEXRAD (S-band) rain radar at the Guam Airport. Spacing between gliders varies from 1 to 60 km. Data samples are gridded by profile and on regular depth bins from 0 to 1000 m. The time interval between profiles was about 3 hours, and they are typically about 1.5 km apart. These profiles are available at Level 2 (basic gridding) and Level 3 (despiked and interpolated). All Seaglider data files are in netCDF format with standards compliant metadata. The project was led by a team from the Applied Physics Laboratory at the University of Washington.
Seaglider CTD data for the SPURS-1 N. Atlantic field campaign
The SPURS (Salinity Processes in the Upper Ocean Regional Study) project is an oceanographic process study and associated field program that aim to elucidate key mechanisms responsible for near-surface salinity variations in the oceans. The project involves two field campaigns and a series of cruises in regions of the Atlantic and Pacific Oceans exhibiting salinity extremes. SPURS employs a suite of state-of-the-art in-situ sampling technologies that, combined with remotely sensed salinity fields from the Aquarius/SAC-D and SMOS satellites, provide a detailed characterization of salinity structure over a continuum of spatio-temporal scales. The SPURS-1 campaign involved a series of 5 cruises during 2012 - 2013 seeking to characterize the salinity structure and balance in a high salinity, high evaporation, and low rainfall region of the subtropical North Atlantic. It aims to resolve processes responsible for maintaining the subtropical surface salinity maximum in this region and within a 900 x 800-mile square study area centered at 25N, 38W. The Seaglider is an autonomous profiler measuring salinity and temperature. Three Seagliders were deployed on the Knorr cruise in September 2012. These were retrieved during the first Endeavor cruise, and then redeployed. The Seagliders typically made loops or butterfly patterns around the central SPURS mooring, diving to 1000 m. Seaglider data files contain vertically resolved trajectory series of conductivity, salinity, temperature, pressure, depth observations.
S-MODE Level 3 Seaglider Observations Version 1
This dataset contains profiles of temperature, dissolved oxygen, salinity, and other observations collected by Seagliders during the Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) field campaign. The experiment was conducted approximately 300 km offshore of San Francisco, during two intensive operating periods in Fall 2022 and Spring 2023. S-MODE aims to understand how ocean dynamics acting on short spatial scales influence the vertical exchange of physical and biological variables in the ocean. Seagliders are autonomous underwater vehicles (AUVs) designed to glide from the ocean surface to as deep as 1000 m and back whilecollecting profiles of oceanic variables. Data are available in netCDF format.
S-MODE Seaglider Observations Version 1
This dataset contains profiles of temperature, dissolved oxygen, salinity, and other observations collected by Seagliders during the Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) field campaign. The experiment was conducted approximately 300 km offshore of San Francisco, during two intensive operating periods in Fall 2022 and Spring 2023. S-MODE aims to understand how ocean dynamics acting on short spatial scales influence the vertical exchange of physical and biological variables in the ocean. Seagliders are autonomous underwater vehicles (AUVs) designed to glide from the ocean surface to as deep as 1000 m and back whilecollecting profiles of oceanic variables. Data are available in netCDF format.
UVP6 from PolarFront seaglider SG644 2023-08-18/2023-08-25
<p>Seaglider SG644 was deployed from 18 to 25 August, 2023 (for details, see the <a href="https://doi.org/10.5281/zenodo.10014336">Cruise Report</a>: https://doi.org/10.5281/zenodo.10014336</p> <p>Sibling datasets from the same deployment:</p> <ul> <li><a href="https://doi.org/10.5281/zenodo.13946034">EK80</a>: https://doi.org/10.5281/zenodo.13946034</li> <li><a href="https://doi.org/10.5281/zenodo.13947021">Physical oceanography</a>: https://doi.org/10.5281/zenodo.13947021</li> </ul>
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