Dataset: EN658 Handnet Deployment Summary

Name: Plankton net cast deployments and collection information from R/V Endeavor cruise EN658 from Narragansett, Rhode Island to Gulfport, Mississippi in October and November of 2020
Published: 2024-12-03
Keywords: oceans

View Data: Data not available yet

Cite This Dataset

Spatial Extent: N:38.05266 E:-73.812477 S:23.981813 W:-91.507183

Methane seep sites along the Western Atlantic margin and within the Gulf of Mexico.

Temporal Extent: 2020-10-24 - 2020-11-05

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:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2024-12-03

Restricted:

Validated:

Current State:

Data not available

Plankton net cast deployments and collection information from R/V Endeavor cruise EN658 from Narragansett, Rhode Island to Gulfport, Mississippi in October and November of 2020

Abstract:

This dataset is a summary of the surface, vertical hand net tows that occurred on R/V Endeavor cruise EN658 in the Western Atlantic margin and Gulf of Mexico (from the University of Rhode Island to Gulfport, Mississippi) in October and November 2020. This was the second sampling cruise of a series of four for 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.

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Methods & Sampling

A vertical plankton tow was conducted by clipping the cod end of the net to a weighted line, lowering the net to 200 meters, and then returning the apparatus to the surface. The plankton tow was then sorted by hand using microscopes and pipettes to isolate any larval forms present.

BCO-DMO Processing

* Table contained in "en658_handnet_collection_summary.csv" was imported into the BCO-DMO data system for this dataset. Values "N/A" imported as missing data values.
** In the BCO-DMO data system missing data identifiers are displayed according to the format of data you access. For example, in csv files it will be blank (null) values. In Matlab .mat files it will be NaN values. When viewing data online at BCO-DMO, the missing value will be shown as blank (null) values.

* Date converted to ISO 8601 format

* "(min)" removed from

* Time zone of "Start" and "End" were indicated to be local time, so to aid in conversion to UTC an additional column local_Time_Zone was added since the cruise was in different timezones (Eastern and Central) and also crossed the daylight savings time boundary.
* ISO DateTime with timezone (UTC) column added in ISO 8601 format. Using Start and End local times and utc offset information. UTC offset sent to the data submitter for verification. Start and End renamed Start_local and End_local for clarity.

* Cruise_ID column added for consistency with related datasets.

* "min" removed from Duration column values and added to column description and unit information. Column typed as interger ("20min"->20).

* lat and lon columns renamed to reflect column contents. Verification request sent to the data submitter.
Columns were labeled:
Start_lat, Start_long, End_lat, End_long
Changed to:
Start_lat, End_lat, Start_long, End_long

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

Plankton Net

Supplied Name:

Supplied Description:

A plankton net with a mesh size of 150 microns was used to filter water and obtain samples.

Instrument Type

Generic Name: Plankton Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/22/

Generic Description:

A Plankton Net is a generic term for a sampling net that is used to collect plankton. It is used only when detailed instrument documentation is not available.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Date	Date of the hand net deployment Format: %Y-%m-%d	unitless	date_local
Cruise_ID	Cruise identifer	unitless	cruise_id
Site_name	The name of the sample site; unitless	unitless	site
Deployment_ID	The cast identification number for each plankton net tow	unitless	cast
Start_lat	Beginning latitude of the plankton net tow	decimal degrees	lat
Start_long	Beginning longitude of the plankton net tow	decimal degrees	lon
End_lat	Concluding latitude of the plankton net tow	decimal degrees	lat
End_long	Concluding longitude of the plankton net tow	decimal degrees	lon
Tow_type	Directionality of the plankton net tow	unitless	sample_descrip
Depth	Maximum depth the plankton net was lowered to	meters (m)	depth
Duration	Amount of time the plankton net tow ran for; given in minutes	count (minutes)	time_elapsed
Start_DateTime_UTC	Start datetime with timezone of the plankton net tow; given in ISO 8601 format (Z indicates UTC) Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Start_local	Start time of the plankton net tow; given in local time Format: %H:%M	unitless	time_local
End_local	End time of the plankton net tow; given in local time Format: %H:%M	unitless	time_local
local_Time_Zone	Time zone (UTC "+-hhmm", ISO 8601 format). UTC offset from local time reported in "Start_local" and "End_local" columns.	unitless	time_diff
Volume	Volume of water filtered by the plankton net during the tow	liters (L)	volume
Num_Morpho	The total number of larval morphotypes, or unique larval types/forms observed in the sample	unitless	count
Total_Larvae	The total number of larvae seen (or calculated) within a sample	unitless	count
Num_New_Morpho	Number of new or unique larval types/forms (morphotypes) not observed in previous samples	unitless	count
Notes	Additional pertinent information regarding the plankton net tow or the subsequent processing of samples	unitless	comment

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Dataset: EN658 Handnet Deployment Summary