Dataset: CTD - Pump Seacat CTD - Down Casts

Name: Downcast profiles from Seacat CTD on MacLane pump from R/V Oceanus OC449-02 and OC449-03 in the Eastern North Atlantic and Indian oceans in 2008 (SIRENA project)
Published: 2011-05-09
License: https://creativecommons.org/licenses/by/4.0/
Keywords: oceans

Cite This Dataset

Project:

Sources of Iron to the EasterN tropical Atlantic (SIRENA)

Principal Investigator:

Phoebe Lam (Woods Hole Oceanographic Institution, WHOI)

Contact:

Phoebe Lam (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

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

Version Date:

2011-05-09

Validated:

Current State:

Preliminary and in progress

Data URL:

https://www.bco-dmo.org/dataset/3475/data

Downcast profiles from Seacat CTD on MacLane pump from R/V Oceanus OC449-02 and OC449-03 in the Eastern North Atlantic and Indian oceans in 2008 (SIRENA project)

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Description

CTD data from Lam SBE19plus (Seacat) attached to end of the MacLane pump line - Down Casts
Note: These data not collected on R/V Islandia ISL0109 cruise

PI's Note/09May2011:
In comparing my pump seacat CTD to the ship's CTD, I've discovered that the ship's CTD's fluorescence and beam attenuation are no good, at least for OC449-3. The ship's fluorometer was clearly just not working. The ship's transmissometer misbehaved in a more subtle manner--oceanographically consistent, but of a different pattern than my pump seacat data. I concluded that my pump seacat CTD's transmissometer is the "correct" one by comparing to discrete particulate carbon measurements on particles collected on my pumps. Both particulate carbon concentrations and beam attenuation from my pump seacat CTD show a minimum at 500m at OC449-3 station 3, whereas the ship's CTD shows an anomalous minimum in subsurface beam attenuation at station 2, which is not seem in the particulate carbon concentrations.

Acquisition Description

The CTD was allowed to debubble briefly just below the surface before paying out wire, but this was often insufficient to get out all bubbles, so upper ~15m of the downcasts are generally not good.

The transmissometer windows were wiped clean with distilled water before and after each cast, and kept capped in between deployments. The voltage of the transmissometer in air (Vair) and in the dark (Vdark) were read after each deployment to monitor drift, though beam attenuation reported here do not yet take shipboard baseline measurements into account, and use the calibrations of the transmissometer from the beginning of OC449-2 cruise.

See: VIII. Protocols for Optics: Transmissometer and Scattering Sensors&rdquoSampling and Sample-handling Protocols for GEOTRACES Cruises, Edited by the 2010 GEOTRACES Standards and Intercalibration Committee.

Processing Description

SBE43 oxygen sensor was calibrated to 32 Winkler titrations conducted on first leg (OC449-2) by Taka Ito at stations 9,13,17,22.

See: “VIII. Protocols for Optics: Transmissometer and Scattering Sensors” in the Sampling and Sample-handling Protocols for GEOTRACES Cruises, Edited by the 2010 GEOTRACES Standards and Intercalibration Committee.

BCO-DMO Processing Notes
- Awk written to reformat original .cnv files contributed by Phoebe Lam
- AWK: SIRENA_CTD_Pump_2_BCODMO.awk

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0726367

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
OC449-02	32OC20080806 SIRENA	2008-08-06	R/V Oceanus	Edward A. Boyle (Chief Scientist) Steven R. Emerson (Co-Chief Scientist) Phoebe Lam (Co-Chief Scientist)	data info
OC449-03	SIRENA	2008-09-08	R/V Oceanus	Phoebe Lam (Chief Scientist) Aron Stubbins (Co-Chief Scientist)	data info

Instruments

CTD Sea-Bird SEACAT

(more info)

Short Name: CTD SEACAT

Community Standard Description

Generic Description

The CTD SEACAT recorder is an instrument package manufactured by Sea-Bird Electronics. The first Sea-Bird SEACAT Recorder was the original SBE 16 SEACAT developed in 1987. There are several model numbers including the SBE 16plus (SEACAT C-T Recorder (P optional))and the SBE 19 (SBE 19plus SEACAT Profiler measures conductivity, temperature, and pressure (depth)). M ore information from Sea-Bird Electronics.

PI supplied instrument name: CTD Sea-Bird SEACAT

Dataset-specific description

* Sea-Bird SBE19plus Data File:
* FileName = C:dataSIRENAseacat awhexfiles20080809_stn3_d1.hex
* Software Version 1.59
* Temperature SN = 5236
* Conductivity SN = 5236
* System UpLoad Time = Aug 10 2008 14:20:50
** KN192-05 SeacatSIRENA OC449-2 Seacat
** Nov-Dec 2007 GMTAugust 2008
** TMCR or McLane DeploymentMcLane Deployments

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	SIRENA Cruise Id	text	cruise_id
station	Station Number	integer	station
cast	Cast Number	integer	cast
CTD_DataSet_Id	CTD Dataset Id	text	dataset_id
date	Station date	YYYYMMDD	date
time	Station time	HHMMSS	time
lat	Station latitude (South is negative)	decimal degrees	lat
lon	Station longitude (West is negative)	decimal degrees	lon
sampled_for	Sampling	text	sample_descrip
depth_station	Station Depth	meters	depth
Temperature	tv290C: Temperature ITS-90	degrees celsius	temp
Conductivity	c0S/m: Conductivity	S/m	cond
Pressure	prdM: Pressure Strain Gauge	decibars	press
Oxygen	sbeox0Mm/Kg: Oxygen; SBE 43	umol/Kg	O2
Bat	bat: Beam Attenuation Chelsea/Seatech/Wetlab CStar	1/m	beam_cp
Fluor	FlECO-AFL: Fluorescence Wetlab ECO-AFL/FL	mg/m^3	fluor
Upoly0	upoly0: Upoly 0 Turbidity Meter	NTU(??)	turbidity
V1	v1: Voltage 1	volts	unknown
OxygenV	sbeox0V: Oxygen Voltage SBE 43	volts	O2_v
Salinity	sal00: Salinity	PSU	sal
Density	sigma-é00: Density sigma-theta	Kg/m^3	density
Depth	depSM: Depth salt water lat=12	meters	depth
PoTemp	potemp090C: Potential Temperature ITS-90	degrees celsius	potemp
Oxygen_Sat	oxsatML/L: Oxygen Saturation	ml/l	O2sat
flag	flag	nd	flag

Database

Geospatial Access

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Dataset: CTD - Pump Seacat CTD - Down Casts