Dataset: EN658 Sentry Dive Summary

Name: Summary of AUV Sentry dives conducted on R/V Endeavor cruise EN658 from Narragansett, Rhode Island to Gulfport, Mississippi in October and November 2020
Published: 2023-04-13
Keywords: sentry, Gulf of Mexico, Western Atlantic Margin, oceans

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Cite This Dataset

Spatial Extent: N:38.0546 E:-73.812477 S:23.981813 W:-91.507558

Project:

Collaborative Research: dispersal depth and the transport of deep-sea, methane-seep larvae around a biogeographic barrier (SALT)

Principal Investigator:

Shawn M. Arellano (Western Washington University - Shannon Point Marine Center, SPMC)

David B. Eggleston (North Carolina State University - Center for Marine Science and Technology, NCSU CMAST)

Craig M. Young (University of Oregon, OIMB)

Co-Principal Investigator:

Ruoying He (Western Washington University, WWU)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-04-13

Restricted:

Validated:

Current State:

Data not available

Summary of AUV Sentry dives conducted on R/V Endeavor cruise EN658 from Narragansett, Rhode Island to Gulfport, Mississippi in October and November 2020

Abstract:

This dataset is a summary of AUV Sentry dives conducted on R/V Endeavor cruise EN658 (Narragansett, Rhode Island to Gulfport, Mississippi) in October and November 2020. This cruise was the second in a series of four in the project titled "Collaborative Research: dispersal depth and the transport of deep-sea, methane-seep larvae around a biogeographic barrier", also called "SALT" for short. Also included in this dataset is a series of vertical plankton net tows conducted on the EN658 cruise to supplement the Sentry dives.

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Methods & Sampling

AUV Sentry dives were made with SyPRID attached. Dives were conducted during R/V Endeavor cruise EN658, from Narragansett, Rhode Island to Gulfport, Mississippi, in October and November 2020. A series of 200-meter vertical plankton net tows were also conducted to supplement the Sentry dives.

Data Processing Description

BCO-DMO Processing:
- removed 'NA' as missing data value (appears as blank/empty in final csv);
- renamed fields to comply with BCO-DMO naming conventions.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1851286
NSF Division of Ocean Sciences	OCE-1851383
NSF Division of Ocean Sciences	OCE-1851421

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
EN658	SALT Fall 2020 cruise	2020-10-22	R/V Endeavor	Shawn M. Arellano (Chief Scientist)	data info

Instruments

AUV Sentry

Supplied Name:

Supplied Description:

AUV Sentry with SyPRID attached.

Instrument Type

Generic Name: AUV Sentry

Generic Description:

The autonomous underwater vehicle (AUV) Sentry is a fully autonomous underwater vehicle capable of exploring the ocean down to 6,000 meters (19,685 feet) depth. Sentry builds on the success of its predecessor the ABE, with improved speed, range, and maneuverability.

Sentry's hydrodynamic shape also allows faster ascents and descents. Sentry carries a superior science sensor suite and an increased science payload enabling it to be used for both mid-water and near-seabed oceanographic investigations. Sentry produces bathymetric, sidescan, subbottom, and magnetic maps of the seafloor and is capable of taking digital bottom photographs in a variety of deep-sea terrains such as mid-ocean ridges, deep-sea vents, and cold seeps at ocean margins. Sentry is uniquely able to operate in extreme terrain, including volcano caldera and scarps. Sentry's navigation system uses a doppler velocity log and inertial navigation system, aided by acoustic navigation systems (USBL or LBL). The USBL system also provides acoustic communications, which can be used to obtain the vehicle state and sensor status as well as to retask the vehicle while on the bottom. In addition its standard sensors, Sentry has carried a variety of science-supplied sensors, including the Nakamura redox potential probe, ACFR 3-D imaging system, and the Tethys in-situ mass spectrometer.

Sentry can be used to locate and quantify hydrothermal fluxes. Sentry is also capable of a much wider range of oceanographic applications due to its superior sensing suite, increased speed and endurance, improved navigation, and acoustic communications. Sentry can be used as a stand alone vehicle or in tandem with Alvin or an ROV to increase the efficiency of deep-submergence investigations.

More information is available from the operator site at URL: http://www.whoi.edu/main/sentry

Sentry Precision Robotic Impeller Driven Sampler

Supplied Name: SyPRID

Supplied Description:

Instrument Type

Generic Name: Sentry Precision Robotic Impeller Driven Sampler

Acronym: SyPRID Sampler

Generic Description:

The SyPRID (Sentry Precision Robotic Impeller Driven) sampler is an innovative deep-rated (6000 m) plankton sampler that partners with the Sentry Autonomous Underwater Vehicle (AUV) to obtain paired, large-volume plankton samples at specified depths and survey lines to within 1.5 m of the seabed and with simultaneous collection of sensor data.

SyPRID uses a perforated Ultra-High-Molecular-Weight (UHMW) plastic tube to support a fine mesh net within an outer carbon composite tube (tube-within-a-tube design), with an axial flow pump located aft of the capture filter. The pump facilitates flow through the system and minimizes the bow wave at the mouth opening. The cod end, a hollow truncated cone, is also made of UHMW plastic and is designed to 'soften' the landing of zooplankton on the capture surface. SyPRID attaches as a saddle-pack to the Sentry vehicle.

Sentry itself is configured with a flight control system that enables autonomous survey paths to altitudes as low as 1.5 m. In its inaugural deployment at the Blake Ridge Seep (2160 m) on the US Atlantic Margin, SyPRID was operated for 6 h at an altitude of 5 m. It recovered plankton samples from that stratum in excellent condition and with greater larval numbers than recovered in a typical 'near-bottom' MOCNESS sample from comparable habitats and depths. The prototype SyPRID and its next generations will enable studies of plankton or other particulate distributions associated with patchy habitats, localized physico-chemical strata (e.g., above and below the thermocline), or discrete water masses at an unprecedented spatial resolution for a large volume system [1].

More information is available by contacting:
Carl Kaiser
Program Manager
Applied Ocean Physics & Engineering
NDSF AUV Operations Manager
Office Phone: +1 508 289 3269
ckaiser@whoi.edu

[1] Billings, A., Kaiser, C., Young, C. M., Hiebert, L. S., Cole, E., Wagner, J. K. S., & Van Dover, C. L. (2017). SyPRID sampler: A large-volume, high-resolution, autonomous, deep-ocean precision plankton sampling system. In Deep Sea Research Part II: Topical Studies in Oceanography (Vol. 137, pp. 297–306). Elsevier BV. https://doi.org/10.1016/j.dsr2.2016.05.007

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Site	Site name	unitless	site
Sample_IDs	Sample identifier; shows the cruise number, the site initials (except for Baltimore Canyon), the Sentry Dive number with Port or Stbd sampler initial or the plankton net casting depth. If multiple net casts were made at a site these are indicated by "B" or "C".	unitless	sample
Sentry_Dive_Number	Sentry dive number	unitless	dive_id
Zooka	?	unitless	no_bcodmo_term
Height_off_bottom	Height off bottom	meters (m)	height
Hours_of_pumping	Duration of pumping	hours and/or minutes	duration
Volume_sampled	Volume sampled	liters (L)	volume
Notes	Notes or comments	unitless	comment
Total_number_of_larvae	Total number of larvae collected	individuals	count
Total_number_of_Morphotypes	Total number of morphotypes present	unitless	count
larvae_per_liter	Number of larvae per liter	larvae per liter	abundance
number_of_new_morphotypes	Number of new morphotypes ?	unitless	count
Start_Lat	Latitude at start of Sentry deployment	degrees North	lat
Start_Lon	Longitude at start of Sentry deployment	degrees East	lon
End_Lat	Latitude at end of Sentry deployment	degrees North	lat
End_Lon	Longitude at end of Sentry deployment	degrees East	lon
Start_Time	Time at start of Sentry deployment; in local time zone unless noted as "UTC" in the "Note_Time_UTC" column Format: %H:%M	unitless	time
End_Time	Time at end of Sentry deployment; in local time zone unless noted as "UTC" in the "Note_Time_UTC" column Format: %H:%M	unitless	time
Note_Time_UTC	Notes if time was recorded in UTC	unitless	comment

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Dataset: EN658 Sentry Dive Summary