Dataset: Drifters - CT

Name: CT Drifter measurements from multiple R/V Wecoma cruises in the Northeast Pacific coastal waters off states of Washington and Oregon from 2004 to 2006 (RISE project)
Published: 2010-09-28
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.3244.1

Spatial Extent: N:47.01737 E:-124.00728 S:46.19222 W:-124.5007

Temporal Extent: 2004-07-09 - 2006-06-10

Project:

River Influences on Shelf Ecosystems (RISE)

Principal Investigator:

Barbara M. Hickey (University of Washington, UW)

Contact:

Nancy Kachel (University of Washington, UW)

BCO-DMO Data Manager:

Stephen R. Gegg (Woods Hole Oceanographic Institution, WHOI)

Version:

Version Date:

2010-09-28

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CT Drifter measurements from multiple R/V Wecoma cruises in the Northeast Pacific coastal waters off states of Washington and Oregon from 2004 to 2006 (RISE project)

Abstract:

This dataset includes CT Drifter measurements from multiple cruises on the R/V Wecoma in the Northeast Pacific coastal waters off states of Washington and Oregon from 2004 to 2006.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2010-09-28	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.3244.1	2022-04-28

Description

RISE - Drifters, CT type
The drifter data come in two varieties: CT and EXP.
All drifters were Brightwaters Corp. drifters.

Methods & Sampling

CT drifters
CT drifters recorded conductivity (C) and temperature (T) in addition to position (± 3 m) and time.
All CT drifters were programmed to record data at 3-minute intervals.
Additionally, all CT drifters were deployed in a surface configuration.
The buoy itself spanned the top 1.25 m of the water and CT data was recorded at 1.25 m depth.
Processing of the data included linearly interpolating all data onto a 3-minutely time vector.
The data were snipped, meaning only data collected while in water are provided.
Raw CT data is given in addition to calibrated CT data (in case calibrations change).
Calibrations were performed and provided by Tom Wilson at Brightwaters Corp.
The calibrated CT data were used to calculate salinity and density, which are also included.
Finally, east and north velocity components, also provided, were calculated by central-differencing
of position data.

Note: BCO-DMO has compiled the separate files into one, single dataset. The original file names can be found in the "Drifter_Data_File" column of the dataset.

File naming:
CT drifter files are named according to:
Drifter PTT ID_MonthDay_Cruise.txt
For example, a file named 22362_A19_R3W.txt contains drifter data recorded by
drifter #22362 starting on August 19th, of the 3rd RISE cruise aboard the R/V Wecoma.
Cruises were:
R1W - July 2004
R2W - May/June 2005
R3W - August 2005
R4W - May/June 2006

Data are in the following units:
Lon - Decimal degrees
Lat - Decimal degrees
Date/Time - Pacific Daylight Time (PDT)
Temperature - Celsius (°C)
Conductivity - (mS cm-1)
Salinity - (psu)
Density - (kg m-3)
Velocity components - (m s-1)

Data Processing Description

BCO-DMO Processing Notes
Generated from original files contributed to BCO-DMO as a zipped data/docs file by Raphael Kudela.

BCO-DMO Edits:
Drifter Documentation/Metadata:
- generated a file of all RISE drifter "metadata" from individual .xls yearly files
- file includes drifterids, models, deployment/recovery dates/times, deployment lats/lons, and comments
- header file was generated from data contained in the .xls files
- empty cells filled with "nd" (no data)
- Added Cruise names such as RISE04W1, etc for consistency with other data sets
Drifter data files:
- simple awk script generated to reformat RISE drifter data to BCO-DMO format
- date reformatted to YYYYMMDD
- time reformatted to HHMMSS
- lat/lon positions output unchanged
- remaining data output unchanged

Data Files

File
CT_Drifters.csv (Comma Separated Values (.csv), 9.17 MB) MD5:32dda6f9414b00e840f0cda82149aa18 Primary data file for dataset ID 3244

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0239089

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
W0407A	RISE04W1 RISE-1 RISE1W WE0407 we0407	2004-07-08	R/V Wecoma	Barbara M. Hickey (Chief Scientist)	data info
W0505C	RISE05W2 RISE-2 RISE2W WE0505C we0505c	2005-05-29	R/V Wecoma	Barbara M. Hickey (Chief Scientist) William T. Peterson (Co-Chief Scientist)	data info
W0508	RISE05W3 RISE-3 RISE3W We0508 we0508	2005-08-04	R/V Wecoma	Kenneth W. Bruland (Chief Scientist)	data info
W0605B	RISE06W4 RISE-4 RISE4W We0605b w0605b	2006-05-21	R/V Wecoma	Barbara M. Hickey (Chief Scientist)	data info

Instruments

Drifter Buoy

Supplied Description:

Brightwater Corp. Model 104a

Instrument Type

Generic Name: Drifter Buoy

Generic Description:

Drifting buoys are free drifting platforms with a float or buoy that keep the drifter at the surface and underwater sails or socks that catch the current. These instruments sit at the surface of the ocean and are transported via near-surface ocean currents. They are not fixed to the ocean bottom, therefore they "drift" with the currents. For this reason, these instruments are referred to as drifters, or drifting buoys.

The surface float contains sensors that measure different parameters, such as sea surface temperature, barometric pressure, salinity, wave height, etc. Data collected from these sensors are transmitted to satellites passing overhead, which are then relayed to land-based data centers.

definition sources: https://mmisw.org/ont/ioos/platform/drifting_buoy and https://www.aoml.noaa.gov/phod/gdp/faq.php#drifter1

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	RISE cruise name	text	cruise_id
Drifter_Data_File	Name of original data file	text	dataset_id
DrifterID	Drifter id	text	inst_serial_numb
Model	Drifter model	text	inst_model
Date_Deployed	Drifter deployment date Event log indicates these dates are GMT although the drifter data date/time are local (PDT)	YYYYMMDD	date_begin
Time_Deployed	Drifter deployment time Event log indicates these times are GMT although the drifter data date/time are local (PDT)	HHMMSS	time_begin
Lon_Deployed	Drifter deployment longitude	decimal degrees (West is negative)	lon_begin
Lat_Deployed	Drifter deployment latitude	decimal degrees (South is negative)	lat_begin
Date_Recovered	Drifter recovery or timed out date Event log indicates these dates are GMT although the drifter data date/time are local (PDT)	YYYYMMDD	date_end
Time_Recovered	Drifter recovery or timed out time Event log indicates these times are GMT although the drifter data date/time are local (PDT)	HHMMSS	time_end
comments	Misc comments	text	comment
date_local	Drifter data date (PDT)	YYYYMMDD	date_local
time_local	Drifter data time (PDT)	HHMMSS	time_local
lon_drift	Drifter data longitude	decimal degrees (West is negative)	lon
lat_drift	Drifter data latitude	decimal degrees (South is negative)	lat
temp	Temperature	degrees celsius	temp
cond	Conductivity	mS cm-1	cond_ss
sal	Salinity	psu	sal_ss
density	Density	kg m-3	density
u_east	u or East velocity component	m s-1	u
v_north	v or North velocity component	m s-1	v
T_nocal	Temperature (no cal)	degrees celsius	SST
C_nocal	Conductivity (no cal)	mS cm-1	cond_ss

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Dataset: Drifters - CT