Dataset: CTD data for mussel study

Name: CTD data from casts before and after larval vertical distribution sampling from R/V C-Hawk day cruises in the Eastern Gulf of Maine from 2012 to 2014
Published: 2019-12-30
Keywords: CTD, oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.783736.1

Spatial Extent: N:44.6609108 E:-67.3390943 S:44.411259 W:-67.6526958

Temporal Extent: 2012-08-01 - 2014-08-07

Project:

Intertidal community assembly and dynamics: Integrating broad-scale regional variation in environmental forcing and benthic-pelagic coupling (GOMEPRO)

Principal Investigator:

Philip O. Yund (Downeast Institute for Applied Marine Research and Education, DEI)

BCO-DMO Data Manager:

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

Version:

Version Date:

2019-12-30

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CTD data from casts before and after larval vertical distribution sampling from R/V C-Hawk day cruises in the Eastern Gulf of Maine from 2012 to 2014

Abstract:

CTD data from casts before and after larval vertical distribution sampling from R/V C-Hawk day cruises in the Eastern Gulf of Maine from 2012 to 2014.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2019-12-30	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.783736.1	2020-01-03

Description

These data were presented in Weinstock et al., 2018 (see Fig 1 and 2). Only downcast density data were analyzed and presented in Weinstock et al., 2018. Water density data were converted to % of water column maximum in Figure 2 of Weinstock et al., 2018.

These data are available in two formats. The version in the BCO-DMO data system contains data from all casts concatenated together with added columns cast_name, Cast_time_UTC, start_latitude, start_longitude, end_latitude, and end_latitude which was originally contained in comment and header lines in 35 cast csv files. The 35 individual cast csv files are available in the "Data Files" section as CTD.zip: "CTD csv files with seabird headers."

Related Datasets: CTD casts were conducted immediately before and after the associated larval vertical distribution sampling (separate dataset description) and on both flood and ebb tides.
* CTD cast log for mussel study: https://www.bco-dmo.org/dataset/783749
* Mussel Larvae Vertical Distribution: https://www.bco-dmo.org/dataset/783755

Methods & Sampling

Conductivity, temperature, and depth were sampled via an instrument cast from a small boat. Casts were conducted immediately before and after the associated larval vertical distribution sampling (see Mussel Larvae Vertical Distribution https://www.bco-dmo.org/dataset/783755) and on both flood and ebb tides.

See Weinstock et al., 2018, for more methodology details.

Problem report:
The second cast data for the flood tide on 7/31/13 are missing.

Data Processing Description

BCO-DMO Data Manager Processing Notes:
* 35 csv files for each cast combined into one tabular dataset. "cast_name" column added which contains information in the original filenames which included "mm_dd_yy_tidephase_cast.csv"
* The 35 original csv files submitted to BCO-DMO were bundled into CTD.zip and is available to download in the "Data Files" section as "CTD csv files with seabird headers." The only change made to these files was to remove blank rows that were in-between every data and header row in a subset of the 35 files.
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions (spaces, +, and - changed to underscores). Units in parentheses removed and added to Parameter Description metadata section.
* blank values in this dataset are displayed as "nd" for "no data." nd is the default missing data identifier in the BCO-DMO system.
* Cast timestamp and start/end latitude and longitudes added to this dataset from parsed information contained in comment and header lines in the originally submitted cast csv files. Other information parsed from these comment lines was turned into a second tabular dataset "CTD cast log" (https://www.bco-dmo.org/dataset/783749).
* Data sorted by Cast_time_UTC, Time, Depth columns

Data Files

File

CTD csv files with seabird headers
filename: CTD.zip

(ZIP Archive (ZIP), 323.58 KB)
MD5:c093e4db408e3e153bdcbfd1e1e31e65

Data are structured in a separate pair of files for each sampling date/tidal phase combination, with file names formatted mm_dd_yy_tidephase_cast.  The first cast was conducted immediately before the larval vertical distribution sampling described in the accompanying dataset file, and the second cast was conducted immediately after larval sampling.  Coordinates, start and end times, and other pertinent metadata are included in the header of each file.  An additional descriptor stating the site name is included in the files from 8/16/12, when two different sites were sampled on the same date.

The CTD.zip file contains 35 .csv files.

ctd_larvae.csv

(Comma Separated Values (.csv), 499.60 KB)
MD5:223a6b7d3ece231b5670486f55ccfac9

Primary data file for dataset ID 783736

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1458188

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
Yund_GoME		2012-08-01	R/V C-HAWK	Philip O. Yund (Principal Investigator)	data info

Instruments

None available yet

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cast_name	Cast identifier. Contains cast date (in format mm_dd_yy), tidal phase (e.g. Ebb) and site identifier (e.g. MB2) where more than one cast was conducted during o mm_dd_yy_tidephase_cast	unitless	cast
Pressure	Pressure	Decibars (dbar)	press
Depth	Depth	Meters (m)	depth
Density	Density	Kilograms per Cubic Meter (kg/m^3)	density
Conductivity	Conductivity	MicroSiemens per Centimeter (uS/cm)	cond
Temperature	Temperature	Celsius (C)	temp
Specific_conductance	Specific conductance	MicroSiemens per Centimeter (uS/cm)	specc
Salinity	Salinity	Practical Salinity Scale	sal
Sound_velocity	Sound velocity	Meters per Second (m/s)	sound_vel
Time	Seconds elapsed from the start of the cast.	seconds (s)	time_elapsed
Cast_time_UTC	Cast date and time (UTC) in ISO 8601 format yyyy-mm-ddTHH:MM:SSZ	unitless	ISO_DateTime_UTC
Start_latitude	Cast start latitiude	Decimal degrees	lat
Start_longitude	Cast start longitude	Decimal degrees	lon
End_latitude	Cast end latitiude	Decimal degrees	lat
End_longitude	Cast end longitude	Decimal degrees	lon