http://lod.bco-dmo.org/id/dataset/638491 eng; USA utf8 dataset Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact 2016-02-12 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Time series of current profiles from a vessel-mounted ADCP from R/V Savannah in the South Atlantic Bight (SAB) continental shelf off Long Bay, January-March 2012 (Long Bay Wintertime Bloom project) 2016-02-15 publication 2016-02-15 revision BCO-DMO Linked Data URI 2016-02-15 creation http://lod.bco-dmo.org/id/dataset/638491 James Nelson Skidaway Institute of Oceanography principalInvestigator Catherine Edwards Skidaway Institute of Oceanography principalInvestigator Harvey E. Seim University of North Carolina at Chapel Hill principalInvestigator Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. publisher Cite this dataset as: Nelson, J., Edwards, C., Seim, H. E. (2016) Time series of current profiles from a vessel-mounted ADCP from R/V Savannah in the South Atlantic Bight (SAB) continental shelf off Long Bay, January-March 2012 (Long Bay Wintertime Bloom project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2016-02-15 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/638491 [access date] Time series of current profiles measured with a vessel-mounted acoustic doppler current profiler Dataset Description: Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1032285 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1032285 Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1032276 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1032276 onGoing James Nelson Skidaway Institute of Oceanography jim.nelson@skio.usg.edu pointOfContact Catherine Edwards Skidaway Institute of Oceanography (912) 598-2471 10 Ocean Science Circle Savannah GA 31411 USA catherine.edwards@skio.uga.edu pointOfContact Harvey E. Seim University of North Carolina at Chapel Hill (919) 962-2083 3117G Venable Hall, CB#3300 Chapel Hill NC 27599-3300 USA hseim@email.unc.edu pointOfContact asNeeded Dataset Version: 1 Unknown time dep loni lati ugpsi vgpsi wgpsi ubti vbti wbti erri wdepi theme None, User defined time of day depth longitude latitude Uranium Vanadium vertical velocity towed No BCO-DMO term depth_w featureType BCO-DMO Standard Parameters Acoustic Doppler Current Profiler instrument BCO-DMO Standard Instruments SAV-12-02 SAV-12-03 SAV-12-05 SAV-12-11 service Deployment Activity South Atlantic Bight (SAB) continental shelf off Long Bay (-79W, 32N; -77W, 34 N) place Locations otherRestrictions otherRestrictions Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use. Mechanisms of nutrient input at the shelf margin supporting persistent winter phytoplankton blooms downstream of the Charleston Bump http://nccoos.org/projects/long-bay-wintertime-blooms/ Mechanisms of nutrient input at the shelf margin supporting persistent winter phytoplankton blooms downstream of the Charleston Bump <p><strong>NSF Project Title:</strong> Mechanisms of nutrient input at the shelf margin supporting persistent winter phytoplankton blooms downstream of the Charleston Bump</p> <p>Sustained phytoplankton blooms along the outer South Atlantic Bight (SAB) continental shelf off Long Bay are observed in winter in multi-year satellite chlorophyll imagery. This section of the shelf lies north of the "Charleston Bump" (between 32.5-33.5°N), where the Gulf Stream is often strongly deflected offshore. Due to this offshore deflection, this is not an area where nutrient input to the shelf would be enhanced by upwelling associated with Gulf Stream frontal eddies, a major mechanism of nutrient input in other parts of the SAB shelf (Lee et al., 1991). Yet prior in situ observations suggest that there is recurring input of nutrients from the upper slope to the outer shelf off Long Bay from winter to early spring. This project will investigate a fundamental aspect of physical-biological coupling in the outer shelf to upper slope region. The PIs will test the hypotheses that: 1) the persistence of winter blooms on the outer shelf off Long Bay results from repeated episodes of nutrient input and mixing which maintains nutrient-sufficient conditions for extended periods; 2) several physical mechanisms are involved, including enhanced mixing energy from the internal tide along this section of the upper slope/shelf break; 3) the relatively high nutrient, intermittently turbulent environment will favor larger bloom-forming phytoplankton. The latter could have important implications for higher trophic levels, including early life history strategies of fish that spawn along the shelf margin off Long Bay in winter to early spring.</p> <p>This project will combine several maturing observational technologies to address the following:</p> <p>1. What is the frequency and magnitude on on-shelf transport of nitrate from the upper slope?<br /> 2. What are the mechanisms of nutrient delivery from the upper slope to the outer continental shelf zone that are operating off Long Bay under the range of hydrographic and forcing conditions encountered in winter?<br /> 3. What is the 3-D structure of outer shelf hydrography and associated winter bloom features and how do these evolve through multiple nutrient input/mixing events?<br /> 4. What are the rates of nitrate utilization and primary production associated with the winter blooms?<br /> 5. Does the winter regime consistently favor a bloom assemblage dominated by larger diatom forms?</p> <p>Near-continuous cross-shelf and upper slope observations will be obtained with two autonomous gliders, time-series measurements on the outer shelf and slope from a set of moored instruments (including a moored profiling system at the shelf break), and repeated cross- and along-shelf ship surveys using a towed, undulating package. Ship station work will include measurements of primary production and on-board analyses of key functional characteristics of the phytoplankton assemblage (cell forms, abundance, size and bio-volume distributions) using a microfluidics/imaging system. In combination, these systems will provide a level of spatial and temporal resolution of physical, nutrient and biological fields that could not be achieved in earlier, station-based field studies and the basis for improved understanding of physical mechanisms of recurring nutrient input to the shelf, and how the nutrient, mixing, and circulation regime in winter structures the phytoplankton community. Coastal naturalists will be engaged through a seabird survey component of the field program that will augment existing information on pelagic seabirds in winter and define their association with oceanographic features on the central South Atlantic Bight shelf and slope.</p> <p>This project will provide a deeper understanding of shelf/slope exchange processes and how these influence shelf ecosystems, generating information that will contribute to implementation of ecosystem-based management in the region.</p> <p>References:<br /> Lee, T. N., J. A. Yoder, and L. P. Atkinson, 1991: Gulf Stream frontal eddy influence on productivity of the southeast U.S. continental shelf. J. Geophys. Res, 96, 22191-22205.<br />  </p> Long Bay Wintertime Bloom largerWorkCitation project eng; USA oceans South Atlantic Bight (SAB) continental shelf off Long Bay (-79W, 32N; -77W, 34 N) 2016-02-15 outer South Atlantic Bight (SAB) continental shelf off Long Bay 0 BCO-DMO catalogue of parameters from Time series of current profiles from a vessel-mounted ADCP from R/V Savannah in the South Atlantic Bight (SAB) continental shelf off Long Bay, January-March 2012 (Long Bay Wintertime Bloom project) Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact http://lod.bco-dmo.org/id/dataset-parameter/638514.rdf Name: time Units: days since 0000-01-01T00:00 Description: <p>MATLAB datenum time</p> http://lod.bco-dmo.org/id/dataset-parameter/638515.rdf Name: dep Units: m Description: <p>Depth (positive below surface)</p> http://lod.bco-dmo.org/id/dataset-parameter/638516.rdf Name: loni Units: digital degrees; positive west Description: <p>longitude</p> http://lod.bco-dmo.org/id/dataset-parameter/638517.rdf Name: lati Units: digital degrees; positive north Description: <p>latitude</p> http://lod.bco-dmo.org/id/dataset-parameter/638518.rdf Name: ugpsi Units: m s-1 -- relative to True N Description: <p>Eastward water velocity (gps referenced)</p> http://lod.bco-dmo.org/id/dataset-parameter/638519.rdf Name: vgpsi Units: m s-1 -- relative to True N Description: <p>Northward water velocity (gps referenced)</p> http://lod.bco-dmo.org/id/dataset-parameter/638520.rdf Name: wgpsi Units: m s-1 Description: <p>Vertical Velocity (gps referenced)</p> http://lod.bco-dmo.org/id/dataset-parameter/638521.rdf Name: ubti Units: m s-1 -- relative to True N Description: <p>Eastward water velocity (bottom-track referenced)</p> http://lod.bco-dmo.org/id/dataset-parameter/638522.rdf Name: vbti Units: m s-1 -- relative to True N Description: <p>Northward water velocity (bottom-track referenced)</p> http://lod.bco-dmo.org/id/dataset-parameter/638523.rdf Name: wbti Units: m s-1 Description: <p>Vertical Velocity (bottom-track referenced)</p> http://lod.bco-dmo.org/id/dataset-parameter/638524.rdf Name: erri Units: m s-1 Description: <p>Error Velocity</p> http://lod.bco-dmo.org/id/dataset-parameter/638525.rdf Name: wdepi Units: m Description: <p>Water depth</p> GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact 587259 https://datadocs.bco-dmo.org/data/302/nelson/LongBay/ship_adcp/data/sav1202shipadcp.mat ADCP data from RV/Savannah cruise SAV-1202 ADCP data from RV/Savannah cruise SAV-1202 download 2530586 https://datadocs.bco-dmo.org/data/302/nelson/LongBay/ship_adcp/data/sav1203shipadcp.mat ADCP data from RV/Savannah cruise SAV-1203 ADCP data from RV/Savannah cruise SAV-1203 download 1659471 https://datadocs.bco-dmo.org/data/302/nelson/LongBay/ship_adcp/data/sav1205shipadcp.mat ADCP data from RV/Savannah cruise SAV-1205 ADCP data from RV/Savannah cruise SAV-1205 download 2086492 https://datadocs.bco-dmo.org/data/302/nelson/LongBay/ship_adcp/data/sav1211shipadcp.mat ADCP data from RV/Savannah cruise SAV-1211 ADCP data from RV/Savannah cruise SAV-1211 download https://osprey.bco-dmo.org/dataset/638491/data/download download onLine dataset &lt;p&gt;Data were read from ADCP binary format using ADCPTools.&amp;nbsp; Because bottom tracking did not work consistently over the cruises because of transects that extended over the upper slope, beyond the range of the ADCP, GPS data were also used to reference the velocities to earth.&amp;nbsp; The processing steps were:&lt;br /&gt; 1. estimate surrogate bottom track velocities using GPS-derived vessel speed and heading,&lt;br /&gt; 2. find heading (-6.5 degrees) and pitch offsets&amp;nbsp; (+3. degrees) that minimize difference between actual and surrogate bottom tracked velocities,&lt;br /&gt; 3. form estimate of bottom depth,&lt;br /&gt; 4. transform all data to earth coordinates and reference water velocities to earth using gps and bottom tracking,&lt;br /&gt; 5. bad flag data near-bottom and deeper based on water depth,&lt;br /&gt; 6. bad flag single ping solutions with error velocities &amp;gt; 0.3 m/s,&lt;br /&gt; 7. form 10 point (roughly 24 second) averages,&lt;br /&gt; 8. bad flag short-term averages where the absolute value of the vertical velocity exceeds 0.3 m/s, or where the absolute value of either of the horizontal velocity components exceeds 1.5 m/s,&lt;br /&gt; 9. form 12 point averages (roughly 5 minute averages) then interpolate to the regular time grid of 5 minutes.&lt;/p&gt; &lt;p&gt;Bad data are flagged with Not-a-Number (NaN).&lt;/p&gt; Specified by the Principal Investigator(s) asNeeded 7.x-1.1 Biological and Chemical Oceanography Data Management Office (BCO-DMO) Unavailable 508-289-2009 WHOI MS#36 Woods Hole MA 02543 USA info@bco-dmo.org http://www.bco-dmo.org Monday - Friday 8:00am - 5:00pm For questions regarding this resource, please contact BCO-DMO via the email address provided. pointOfContact PI Supplied Instrument Name: PI Supplied Instrument Description:Teledyne RDI 300 kHz Work Horse Acoustic Doppler Current Profiler (RDI ADCP) Instrument Name: Acoustic Doppler Current Profiler Instrument Short Name:ADCP Instrument Description: The ADCP measures water currents with sound, using a principle of sound waves called the Doppler effect. A sound wave has a higher frequency, or pitch, when it moves to you than when it moves away. You hear the Doppler effect in action when a car speeds past with a characteristic building of sound that fades when the car passes. The ADCP works by transmitting "pings" of sound at a constant frequency into the water. (The pings are so highly pitched that humans and even dolphins can't hear them.) As the sound waves travel, they ricochet off particles suspended in the moving water, and reflect back to the instrument. Due to the Doppler effect, sound waves bounced back from a particle moving away from the profiler have a slightly lowered frequency when they return. Particles moving toward the instrument send back higher frequency waves. The difference in frequency between the waves the profiler sends out and the waves it receives is called the Doppler shift. The instrument uses this shift to calculate how fast the particle and the water around it are moving. Sound waves that hit particles far from the profiler take longer to come back than waves that strike close by. By measuring the time it takes for the waves to bounce back and the Doppler shift, the profiler can measure current speed at many different depths with each series of pings. (More from WHOI instruments listing). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/115/ Cruise: SAV-12-02 SAV-12-02 R/V Savannah Community Standard Description R/V Savannah vessel SAV-12-02 James Nelson Skidaway Institute of Oceanography Cruise: SAV-12-03 SAV-12-03 R/V Savannah Community Standard Description R/V Savannah vessel SAV-12-03 James Nelson Skidaway Institute of Oceanography Cruise: SAV-12-05 SAV-12-05 R/V Savannah Community Standard Description R/V Savannah vessel SAV-12-05 James Nelson Skidaway Institute of Oceanography Cruise: SAV-12-11 SAV-12-11 R/V Savannah Community Standard Description R/V Savannah vessel SAV-12-11 James Nelson Skidaway Institute of Oceanography R/V Savannah Community Standard Description R/V Savannah vessel