Dataset: Nitrate Uptake

Name: 15NO3 uptake measured during experimental cycles in 24-hour in situ incubations on R/V Melville cruise MV1008 in the Costa Rica Dome in 2010 (CRD FLUZiE project)
Published: 2014-05-29
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.516108.1

Spatial Extent: N:10.41583 E:-86.82898 S:8.50004 W:-92.98494

Temporal Extent: 2010-06-24 - 2010-07-23

Project:

Costa Rica Dome FLUx and Zinc Experiments (CRD FLUZiE)

Program:

Integrated Marine Biogeochemistry and Ecosystem Research -US (IMBER-US)

Ocean Carbon and Biogeochemistry (OCB)

Principal Investigator:

Michael R. Landry (University of California-San Diego, UCSD-SIO)

Contact:

Michael Stukel (University of Maryland Center for Environmental Science, UMCES/HPL)

BCO-DMO Data Manager:

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

Version:

Version Date:

2014-05-29

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset/516108/data

15NO3 uptake measured during experimental cycles in 24-hour in situ incubations on R/V Melville cruise MV1008 in the Costa Rica Dome in 2010 (CRD FLUZiE project)

Abstract:

15NO3 uptake rates measured during experimental cycles on the MV1008 cruise in the Costa Rica Dome (CRD) region of the Eastern Tropical Pacific Ocean.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2014-05-29	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.516108.1	2019-12-11

Description

15NO3 uptake rates measured during experimental cycles on the MV1008 cruise in the Costa Rica Dome (CRD) region of the Eastern Tropical Pacific Ocean.

Acquisition Description

15NO3- uptake rates were determined daily during experimental cycles from samples incubated on the in situ array at 8 depths spanning the euphotic zone. Each day samples were collected from Niskin rosette into polycarbonate bottles (a single 1.2-L bottle per depth). Samples were spiked with K15NO3 (final concentration 0.100 umol L-1). All samples were incubated in situ for 24 hours beginning and ending at ~04:00 am local time. Upon recovery, 5NO3 uptake samples were immediately filtered through pre-combusted GF/F filters at low pressure and frozen in liquid nitrogen. On land, they were thawed, acidified, dried out, and analyzed by mass spec at the SIO Analytical Facility.

Processing Description

Nitrate uptake was calculated following Dugdale and Wilkerson (1986). 15Ninit, 15Nfinal, 15Nnat, and 15Nspk were the 15:14N mass ratios for ambient PON in the water column (averaged for the cycle), final PON at the end of the incubation, water column NO3, and the K15NO3 spike, respectively. [NO3]nat was the water column nitrate values at the beginning of the incubation (determined from 0.1-um filtered, frozen samples analyzed at the UCSB Analytical Facility) and [15NO3]spk was the final concentration of added K15NO3 (0.1 umol L-1). Since [NO3]nat was not determined until the end of the cruise, the investigators used a fixed [15NO3]spk. The previous equation can significantly overestimate ambient nitrate uptake rates when [15NO3]spk is greater than 10% of [NO3]nat, so when this was determined to be the case, the investigators assumed that [NO3]nat was significantly than the half-saturation constant for NO3 and hence applied a correction such that ρcorrected=ρ×[NO3]nat/([NO3]nat+[NO3]spk).

BCO-DMO added lat and lon values from the MV1008 event log.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0826626

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
MV1008		2010-06-22	R/V Melville	Michael R. Landry (Chief Scientist)	data info

Instruments

Mass Spectrometer

(more info)

Short Name: Mass Spec

Community Standard Description

Generic Description

General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.

PI supplied instrument name: Mass Spec

Dataset-specific description

Samples were analyzed by mass spec at the SIO Analytical Facility.

Niskin bottle

(more info)

Short Name: Niskin bottle

Community Standard Description

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.

PI supplied instrument name: Niskin bottle

Dataset-specific description

Each day samples were collected from Niskin rosette into polycarbonate bottles.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
event	Number referring to the particular activity (event) on the FluZiE cruise.	integer	event
cast	CTD Cast number from the FluZiE cruise.	integer	cast
cycle	Refers to the 4-day Lagrangian experiment during which the sample was taken.	integer	unknown
date	Date of CTD cast from which the water for the incubation was drawn (local time zone of UTC -6). format: mmddyyyy	unitless	date
event_lat	Latitude (in degrees North); added by BCO-DMO from the MV1008 event log.	decimal degrees	lat
event_lon	Longitude (in degrees East); added by BCO-DMO from the MV1008 event log.	decimal degrees	lon
depth	Nominal depth (in meters) that the sample was taken from and incubated at.	meters	depth
sample	Refers to a specific 15NO3 uptake incubation measurement.	unitless	sample
nitrate	Ambient nitrate concentration of the initial water that was used for the incubation.	micromolar (uM)	NO3
NO3_uptake	NO3- uptake rate. See processing description for equations used.	micromoles N per liter per day (umol N L-1 d-1)	pNO3

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Dataset: Nitrate Uptake

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