Dataset: nutrients
Deployment: FK141215

General nutrient data (averages) from Leggo drop 1 seawater

Principal Investigator:

Douglas Bartlett (University of California-San Diego Scripps, UCSD-SIO)

BCO-DMO Data Manager:

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

Project:

Patterns of Microbial Community Structure Within and Between Hadal Environments (Mariana Perspectives)

Current State:

Final no updates expected

Version:

13 March 2017

Version Date:

2017-03-13

Data URL:

https://www.bco-dmo.org/dataset-deployment/684345/data

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Description

General nutrient data (averages) from Leggo drop 1 seawater collected by 3L Niskin bottle.

NOTE: sample RG10 in this dataset is equivalent to RG09 in the event log, due to at-sea recording error. RG10-2 is equivalent to RG10 in the event log.

Methods & Sampling

Dataset acquisition description

This data set is associated with PI Douglas Bartlett (NSF OCE-1536776) and Schmidt Ocean Institute R/V Falkor cruise FK141215. The cruise occurred December 15-21, 2014 in the Challenger Deep within the territorial waters of the Federated States of Micronesia. During this cruise the Leggo lander was deployed multiple times and drops 1 and 3 recovered seawater samples that were analyzed. Additional details can be found at: https://schmidtocean.org/cruise/expanding-mariana-trench-perspectives/ and https://scripps.ucsd.edu/labs/dbartlett/contact/challenger-deep-cruise-2014/

Leggo Lander Drop 1:
Time (in Guam) deployed/recovered: December 16, 9:00/19:26.
Position at deployment: 11° 21.9836 N 142° 25.9533 E, middle section of the Challenger Deep.
Greatest depth of dive: approximately ~10,900 m.
In situ temperature on seafloor: 2.6°C.
Notes: This drop recovered seawater samples from about a meter off the seafloor. This included a 3 L Niskin bottle of seawater and ~ 150 mls of seawater collected in a pressure-retaining seawater sampler. The PRS sampler held more than 81% of the in situ pressure.

Nutrients:
Seawater nutrients were measured from the 3 liter Niskin bottle used during the first drop of Leggo Lander. The description of general inorganic nutrient measurements performed by Scripps Institution of Oceanography Shipboard Technical Support can be found at https://scripps.ucsd.edu/ships/shipboard-technical-support/odf/chemistry-services/nutrients

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
-modified parameter names to conform with BCO-DMO naming conventions;
-replaced spaces with underscores;
-replaced '-' with 'nd' (no data);
-added dates, times, locations from metadata form.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1536776	NSF Division of Ocean Sciences

Instruments

Leggo Lander

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Leggo Lander

Generic Description:

The "Leggo Lander" is a lander system that primarily relies on syntactic foam for buoyancy and uses iridium GPS, radio signal, strobe light and flag for surface recovery, and acoustics for underwater monitoring and instrument control. The lander has a timer with 5 control settings for various operations. It routinely measures pressure (depth) throughout its dive and temperature on the seafloor. The lander payloads include a pressure-retaining seawater sampler plus 2 liter Niskin bottle, and a camera/battery/light system that also includes a 30 liter Niskin bottle and a sea cucumber trap. With the camera payload it travels down or up the water column at about 39 meters per minute (~ 4.5 hours for a descent to the Challenger Deep at ~10,920 m).

(Description obtained from the R/V Falkor FK141215 post-cruise report (PDF))

Niskin bottle

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 segmented continuous-flow AutoAnalyzer 3

Supplied Description:

Nutrient analyses are performed on a SEAL Analytical segmented continuous-flow AutoAnalyzer 3 (AA3).

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

Supplied Name	Supplied description	Supplied Units	Standard Name
drop_name	Name of the lander drop	unitless	sample
NO3_avg	NO3 average	micromolar	NO3
PO4_avg	PO4 average	micromolar	PO4
silicate_avg	Silicate average	micromolar	Silicate
NO2_avg	NO2 average	micromolar	NO2
NH4_avg	NH4 average	micromolar	NH4
ISO_DateTime_deploy	Date and time (local Guam time zone) of lander deployment; formatted to ISO 8601 standard.	unitless	ISO_DateTime_Local
ISO_DateTime_recover	Date and time (local Guam time zone) of lander recovery; formatted to ISO 8601 standard.	unitless	ISO_DateTime_Local
lat	Latitude of lander deployment	decimal degrees	lat
lon	Longitude of lander deployment	decimal degrees	lon

Database

Contribute Data

Dataset: nutrients
Deployment: FK141215

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: nutrientsDeployment: FK141215

Dataset acquisition description

Dataset Processing Description

Dataset: nutrients
Deployment: FK141215