Dataset: LIS0507_physical_data

Name: Temperature, salinity, O2, velocity, and headings from R/V Challenger cruise LIS0507 in the Long Island Sound in 2007
Published: 2012-05-14
Keywords: oceans

Cite This Dataset

Spatial Extent: N:41.25812 E:-72.3233 S:41.23428 W:-72.33708

Project:

Testing hypotheses about diversity, gene flow, and effective population size in marine planktonic ciliates (CiliateDivGenePop)

Principal Investigator:

George McManus (University of Connecticut, UConn - Avery Point)

Co-Principal Investigator:

Laura A. Katz (Smith College)

BCO-DMO Data Manager:

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

Version:

14 May 2012

Version Date:

2012-05-14

Validated:

Yes

Current State:

Final no updates expected

Temperature, salinity, O2, velocity, and headings from R/V Challenger cruise LIS0507 in the Long Island Sound in 2007

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Description

Physical data from the LIS0507 cruise recorded by CTD and ADCP. Note that temperature, salinity, and oxygen concentration values are from CTD casts (averaged for depth of water) and not from the niskin bottles used to collect samples for DNA analysis. There is a lag in time and some drift of reaserch vessel between the two, since the niskin bottles were not on the CTD itself.

Related files and references:
Doherty, M, M Tamura, BA Costas, ME Ritchie, GB McManus, and LA Katz. 2010. Ciliate Diversity and Distribution Across an Environmental and Depth Gradient in Long Island Sound, USA. Environmental Microbiology 12:886-898. doi:10.1111/j.1462-2920.2009.02133.x (PDF)

Methods & Sampling

Physical data were collected during a 6-station sampling cruise in Long Island Sound on 01 June 2007. Samples were collected at an increasing distance from the shore, over increasing depths. Some lat, lon, and time values were estimated from the ship's log.

Data Processing Description

Physical data were processed with the SeaSoft program from SeaBird.

BCO-DMO made the following modifications to the dataset: format of parameter names was changed to conform to BCO-DMO conventions; blanks were replaced with 'nd;, lat and lon values were converted from degrees/decimal minutes to decimal degrees; missing time_gmt value for sample 264 was added; lon value of sample 267 was changed from 072 49.583 to 072 19.583 (presumed to be a typographical error).

Data Files

File
LIS0507_physical.csv (Comma Separated Values (.csv), 1.67 KB) MD5:643817c1714b36d2e660547f2aedb4c6 Primary data file for dataset ID 3653

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0648711

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
LIS0507		2007-06-01	R/V Challenger	George McManus (Principal Investigator)	data info

Instruments

Acoustic Doppler Current Profiler

Supplied Description:

Instrument Type

Generic Name: Acoustic Doppler Current Profiler

Acronym: ADCP

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/115/

Generic 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).

CTD Sea-Bird

Supplied Description:

Temperature, salinity, and oxygen concentrations were recorded at each station using a SeaBird CTD.

Instrument Type

Generic Name: CTD Sea-Bird

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics, no specific unit identified. This instrument designation is used when specific make and model are not known. See also other SeaBird instruments listed under CTD. More information from Sea-Bird Electronics.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
year	Year the sample was taken, in YYYY format.	dimensionless	year
month_gmt	Month in GMT format.	dimensionless	month_gmt
day_gmt	Day in GMT format.	dimensionless	day_gmt
yrday_gmt	Sequential day of the year on which the sample was taken.	dimensionless	yrday_gmt
station	Numeric identifier of the sample station.	dimensionless	station
sample	Unique identifier of the sample.	dimensionless	sample
site_descrip	Indicates if the sample site is located in ('in_plume') or out ('out_plume') of the plume.	dimensionless	site_descrip
time_local	Local time at which the sample was taken.	dimensionless	time_local
time_gmt	Time in GMT format (local time +4 hours).	dimensionless	time_gmt
lat	Latitude. Positive values indicate North. Values have been converted from degrees and decimal-minutes to decimal degrees.	decimal degrees	lat
lon	Longitude. Negative values indicate West. Values have been converted from degrees and decimal-minutes to decimal degrees.	decimal degrees	lon
depth	Sample depth in meters.	meters	depth
temp	Temperature of the water sample in degrees Celsius.	degrees Celsius	temp
sal	Salinity of the water sample.	PSU	sal
O2_mg	Oxygen level of water sample measured in mg/L.	mg/L	no_bcodmo_term
u	Eastward velocity measured by ADCP (in cm/s). Originally named 'East Velocity'.	cm/s	u
v	Northward velocity measured by ADCP (in cm/s). Originally named 'NorthVelocity'.	cm/s	v
angle_from_N	Angle from North, measured in degrees.	degrees	curr_dir_rel
magnitude	Magnitude in cm/s.	cm/s	no_bcodmo_term
compass_head	Compass heading in degrees from true North.	degrees	heading
cruiseid	Unique identifier of the cruise.	dimensionless	cruiseid
ISO_DateTime_UTC	Date and time formatted to ISO8601 standard. T indicates start of time string; Z indicates UTC.	YYYY-MM-DDTHH:MM:SS.ssZ	ISO_DateTime_UTC

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Database

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Dataset: LIS0507_physical_data