Dataset: BLOOFINZ-IO nutrients and isotopes

Name: Water column inorganic nutrient concentration and nitrate+nitrite d15N and d18O measurements from R/V Roger Revelle cruise RR2201 in the Argo Basin in the Indian Ocean from February to March of 2022
Published: 2025-02-10
Keywords: nutrients, Indian Ocean, Argo Basin, N-isotopes, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.952591.1

Spatial Extent: N:-13.010074 E:121.497699 S:-17.126302 W:114.135104

Argo basin in the Eastern Indian Ocean/Indonesian

Temporal Extent: 2022-02-03 - 2022-03-02

Project:

Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean (BLOOFINZ-IO)

Program:

Second International Indian Ocean Expedition (IIOE-2)

Principal Investigator:

Sven A. Kranz (Florida State University, FSU)

BCO-DMO Data Manager:

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

Version:

Version Date:

2025-02-10

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Water column inorganic nutrient concentration and nitrate+nitrite d15N and d18O measurements from R/V Roger Revelle cruise RR2201 in the Argo Basin in the Indian Ocean from February to March of 2022

Abstract:

This dataset includes water column inorganic nutrient concentration and nitrate+nitrite d15N and d18O measurements from a February 2022 cruise in the Argo Basin (NW of Australia (Lat: -15, Lon 114). Water column samples were collected by Niskin bottle on a CTD rosette in the Argo basin in the Eastern Indian Ocean/Indonesian throughflow (NW of Australia) on board the R/V Roger Revelle during cruise RR2201 (BLOOFINZ-IO). Samples were collected between February 4th 2022 and March 2nd 2022.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2025-02-10	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.952591.1	2025-02-13

Description

See the section "Related Datasets" on this page for related CTD downcast and bottle data mentioned in the metadata for this dataset.

Methods & Sampling

Water column samples were collected by Niskin bottle on a CTD rosette (“CTD profile”) during 4 pseudo-Lagrangian cycles (Cycle 1 to Cycle 4)and via Go-flo bottles during a subsequent transect (Argo-stations). All samples were filtered into pre-washed HDPE bottles using a 0.2 µm (Pall Acro Pack) filter capsule. Nutrient bottles were taken in duplicates for analysis of inorganic nutrients ((A-sample) and NO3-isotopes (B-sample). All samples were frozen at -20 °C until analysis.

Inorganic nutrients (NO3, NO2, POx, NH4, Si) were measured through UCSD/Scripps. Nutrient analyses are performed on a Seal Analytical continuous-flow AutoAnalyzer 3 (AA3); https://scripps.ucsd.edu/ships/shipboard-technical-support/odf/chemistry-services/nutrients. The detection limits for the methods/instrumentation are (in micro moles/liter): NO3+NO2 = 0.02; PO4 = 0.02; Sil = 0.5; NO2 = 0.02; NH4 = 0.1

NO3 isotope samples were prepared by thawing the 'to-be-analyzed' samples and removing any nitrite using the method described by Granger and Siegman 2009. Nitrate was measured prior and after acidification and refrozen for shipping. The analysis was performed at the UC-Davis Isotope Facility using the "NO3 Analysis by Bacteria Denitrification" - https://stableisotopefacility.ucdavis.edu/nitrate-no3-water.

Accepted Precision: 0.4 ‰ for ¹⁵N; 0.5 ‰ for ¹⁸O

Problems/Issues

Gaps in sampling due to overfilling before freezing, lost samples and contamination issues (due to replaced Niskin bottle) are indicated in the notes column.

Data Processing Description

Data presented here are raw data. Filters were applied for samples with notes of "contamination" and "overfilled" - these data were set to 'NA' values (see BCO-DMO Processing section for more information about how missing data values will appear depending upon the format you download).

BCO-DMO Processing

* Data table from submitted file "RR2201_nutrient_CTD_Cycles_BCO_DMO_2024.csv" was imported into the BCO-DMO data system for this dataset. Values "NA" imported as missing data values. Table will appear as Data File: 952591_v1_bloofinz-io-nutirents-and-isotopes.csv (along with other download format options).

Missing Data Identifiers:
* 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.

* Column names adjusted to conform to BCO-DMO naming conventions designed to support broad re-use by a variety of research tools and scripting languages. [Only numbers, letters, and underscores. Can not start with a number]

* Date converted to ISO 8601 format

* GPS datetime with timezone (UTC) column added in ISO 8601 format "GPS_DateTime_UTC". Since "date" column (TZ undocumented) column did not match the UTC date (compared to event id), the GPS_DateTime_UTC column relied GPS time and the date event number not the "date" column. BCO-DMO data manager will reach out to submitter to find out what time zone "date" column was recorded in and add that information to the Parameters section if it can be found.

* cycle and Cycle columns renamed for clarity if a user renames all to lowercase. cycle-> cycle_label, Cycle-> Cycle_number

* Data submitter clarified the "Seafloor" and "depth" columns were in meters(m). Units added to the parameters section.

Data Files

File
952591_v1_bloofinz-io-nutirents-and-isotopes.csv (Comma Separated Values (.csv), 50.58 KB) MD5:6a9fd1e63c6cf01c5c461cc6ebad4bd6 Primary data file for dataset ID 952591, version 1

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-2404504
NSF Division of Ocean Sciences	OCE-1851347
NSF Division of Ocean Sciences	OCE-1851558
NSF Division of Ocean Sciences	OCE-1851381
NSF Division of Ocean Sciences	OCE-1851395

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR2201	BLOOFINZ-IO	2022-01-20	R/V Roger Revelle	Michael R. Landry (Chief Scientist)	data info

Instruments

CTD Sea-Bird SBE 911plus

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SBE 911plus

Acronym: CTD SBE 911plus

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/

Generic Description:

The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics

GO-FLO Bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: GO-FLO Bottle

Acronym: GO-FLO

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/30/

Generic Description:

GO-FLO bottle cast used to collect water samples for pigment, nutrient, plankton, etc. The GO-FLO sampling bottle is specially designed to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Niskin bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Nutrient Autoanalyzer

Supplied Name: Seal Analytical continuous-flow AutoAnalyzer 3

Supplied Description:

Instrument Type

Generic Name: Nutrient Autoanalyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB04/

Generic Description:

Nutrient Autoanalyzer is a generic term used when specific type, make and model were not specified. In general, a Nutrient Autoanalyzer is an automated flow-thru system for doing nutrient analysis (nitrate, ammonium, orthophosphate, and silicate) on seawater samples.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Project	indicates the cruise ID	unitless	cruise_id
Nutrient_bottle	progressive numbering system of sampling bottles (for internal use)	unitless	sample_descrip
CTD_cast	based on CTD log of the cruise	unitless	cast
CTD_bottle	Niskin bottle number	unitless	bottle
depth	depth of sample	meters (m)	depth
CTD_comment	Array depth indicates samples were taken at the same depth than all in-situ arrays for e.g. 14C uptake, NO3 uptake and N2 fixation), DEEP indicates samples taken from a deep profile, HIGH_Res indicates samples taken with a finer depth resolution	unitless	comment
date	date of sampling. Date in local time zone (Perth/Australia) Format: %Y-%m-%d	unitless	date_local
cycle_day	indicates the Lagrangian cycle number and the day of the cycle (e.g. C1_D2: Cycle 1 Day 2), 'b' indicates a second profile during a day, 'HS' indicates a high resolution sample during a cycle	unitless	sample_descrip
cycle_label	Descriptive label for the Lagrangian cycle	unitless	sample_descrip
Cycle_number	indicates the number of the Lagrangian cycle	unitless	sample_descrip
Day_cycle	indicates the day of the cycle	unitless	sample_descrip
Event	indicates the ships event-number - indicating date and hour (UTC) (YYYYMMDD.hhmm.001)	unitless	event
GPS_Time	indicates the time of CTD rosette deployment (UTC time). 12hour time with AM\|PM. Format: %I:%M:%S %p	unitless	time_gmt
GPS_DateTime_UTC	Datetime with timezone for the CTD rosette deployment (UTC timezone as Z). ISO 8601 format (24 hr time). Format: %Y-%m-%dT%H:%M:%SZ	unitless	ISO_DateTime_UTC
Instrument	indicates the instrument used	unitless	instrument
Action	indicates what was done at that time/day (here deployment)	unitless	comment
Station	(redundant-for plotting purpose) - indicating the cycle and day of cycle	unitless	station
Latitude	Latitude of sampling	decimal degrees	lat
Longitude	Longitude of sampling	decimal degrees	lon
Seafloor	Seafloor depth as taken from depth sensor.	meters (m)	depth_bottom
Author	indicates the scientist who logged the event	unitless	recorder
NO3	Nitrate concentration	micromolar (uM)	NO3
PO4	Phosphate concentration	micromolar (uM)	PO4
SIL	silicic acid concentration	micromolar (uM)	Si_acid
NO2	Nitrite concentration	micromolar (uM)	NO2
NH4	Ammonium concentration.	micromolar (uM)	NH4
d15N	isotopic (d15N) composition of the N in NO3	permille (0/00)	d15N
d18O	isotopic (d18O) composition of O in NO3	permille (0/00)	d18O
iso_ID_1	internal identifier 1	unitless	sample_descrip
iso_ID_2	internal identifier 2	unitless	sample_descrip
iso_ID_3	internal identifier 3	unitless	sample_descrip
notes	includes notes from during the cruise and while inspecting samples	unitless	comment