http://lod.bco-dmo.org/id/dataset/555666
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2015-04-10
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
15N2-based N2 fixation rates from the Eastern Tropical South Pacific collected on the R/V Atlantis (AT15-61) and R/V Melville (MV1104) in 2010-2011 (N2 fixation ETSP project)
2016-02-29
publication
2016-02-29
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2016-02-29
publication
https://doi.org/10.1575/1912/7227
Douglas G. Capone
University of Southern California
principalInvestigator
William M. Berelson
University of Southern California
principalInvestigator
Dennis Hansell
University of Miami Rosenstiel School of Marine and Atmospheric Science
principalInvestigator
Angela N. Knapp
University of Miami Rosenstiel School of Marine and Atmospheric Science
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Capone, D., Berelson, W., Casciotti, K., Hansell, D., Knapp, A. (2015) Eastern Tropical South Pacific Nitrogen fixation. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2016-02-29 [if applicable, indicate subset used]. doi:10.1575/1912/7227 [access date]
15N2-based N2 fixation rates from the Eastern Tropical South Pacific, 2010-2011 Dataset Description: <p>15N2 incubation-based N2 fixation rates, nitrate plus nitrite concentration and d15N, sediment trap PN mass flux and isotopic composition from the Eastern Tropical South Pacific, 2010 and 201</p> Methods and Sampling: <p><strong>Water column sample collection:</strong>&nbsp;Samples were collected on the R/V Atlantis in January through February 2010, and the R/V Melville in March through April 2011 on a zonal transect along 20º S between 80º W and 100º W, with exact station locations and sample depths, nutrient concentrations and isotopic compositions reported below. Water column samples were collected by Niskin bottles deployed on a rosette equipped with conductivity-temperature-depth (CTD) sensors. All samples were collected into acid-washed, sample-rinsed HDPE bottles, and samples from the upper 400 m passed a 0.2 µm filter before collection. All samples were stored at -20º C until analysis on land.</p>
<p><strong>15N2 fixation rate measurements</strong>: Short-term N2 fixation rate measurements incubated with 15N2 gas from Sigma Aldrich (lot #s SZ1670V and MBBB0968V) were carried out in acid-washed, sample-rinsed light transparent 4 L polycarbonate bottles amended with 1.5 mL of 99% 15N2&nbsp; and 1.5 mL of 0.5M NaH13CO3. Incubations were performed under simulated in situ conditions of temperature and light and run for staggered periods (e.g. 0, 12, 24 and 48 hrs). Incubations were terminated by filtration of the 4 L sample onto a precombusted 25 mm Whatman GF/F, which was then analyzed by mass spectrometry at the University of Southern California for d15N and d13C. During ESTP 1, periodic time zero incubations were measured, with samples filtered within 5 to 10 minutes of injection of 15N2. Zero time enrichments were typically near natural abundance levels with the greatest observed enrichment in 8 experiments at 23‰, essentially at natural abundance level for our tracer experiments. We assumed natural abundance (0.3663 atom %) for calculations. Limits of detection are about 10-14 µg for N and 6-10 µg for C. Reproducibility as the standard deviation for isotopic analysis is about ±0.3‰ for d15N and ±0.2‰ for d13C, and about ±0.1-0.2 µg for mass determinations.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0850801 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0850801
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0850905 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0850905
completed
Douglas G. Capone
University of Southern California
213-740-2772
616 Trousdale Parkway AHF 246
Los Angeles
CA
90089
USA
capone@usc.edu
pointOfContact
William M. Berelson
University of Southern California
310-804-8981
Department of Earth Sciences (ZHS 227) 3651 Trousdale Pky.
Los Angeles
CA
90089-0740
USA
berelson@usc.edu
pointOfContact
Dennis Hansell
University of Miami Rosenstiel School of Marine and Atmospheric Science
305-421-4078
Coral Gables
FL
33124
USA
dhansell@miami.edu
pointOfContact
Angela N. Knapp
University of Miami Rosenstiel School of Marine and Atmospheric Science
(979) 862-5235
797 Lamar St. Dept of Oceanography, Eller O&M Room 1204
College Station
TX
77843
USA
aknapp@tamu.edu
pointOfContact
asNeeded
Dataset Version: 2016-02-29
Unknown
date
station
lat
lon
depth
Nfix_umol_N_m2_d
Nfix_stdev
cruise_id
CTD
Gas Chromatograph
theme
None, User defined
date_local
station number
latitude
longitude
depth
nitrogen fixation rate
standard deviation
Cruise identfier
featureType
BCO-DMO Standard Parameters
CTD - profiler
Gas Chromatograph
instrument
BCO-DMO Standard Instruments
AT15-61
MV1104
service
Deployment Activity
Eastern Tropical South Pacific
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific
https://osprey.bco-dmo.org/project/555496
Collaborative Research: Documenting N2 fixation in N deficient waters of the Eastern Tropical South Pacific
<p><em>Description from NSF award abstract:</em><br />
Several independent lines of geochemical and remote sensing evidence suggest that dinitrogen (N2) fixation may be associated with surface waters downstream of major oxygen minimum zones (OMZs) and in particular in the Eastern Tropical South Pacific (ETSP). However, little direct evidence supports these inferences. Besides substantiating these indirect assessments, documenting significant N2 fixation in the ETSP would provide insight into two longstanding controversies: Is the marine N budget balanced, as implied by modeling and paleoceanographic data, and if so, how are the processes that add and remove N spatially, and thus temporally coupled?</p>
<p>In this project researchers at the University of Southern California and the University of Miami will test the hypothesis that fixation occurs in the ETSP at areal rates that equal or exceed those previously documented in more well-studied regions such as the oligotrophic waters of the sub/tropical North Atlantic. If scaled to the surface area of ETSP waters, this could add an additional 10-50 Tg N per year of inputs to the global marine N budget. They will undertake two cruises in the ETSP during early and late summer in two consecutive years to assess the quantitative significance of N2 fixation as a source of new N to surface waters using complementary biological and geochemical tools. N2 fixation rates will be evaluated on two temporal/spatial scales: daily/local (bottle 15N2 incubations and floating sediment traps); and seasonal/regional (d15N budget using moored sediment traps and water column TDN d15N). These estimates provide detailed observations of potential N2 fixation during station occupation in two summer seasons, when rates are expected to be greatest, as well as prolonged observation over lower expected N2 fixation periods. A combination of these different estimates will aim to determine if N2 fixation in this region can help balance the marine N budget. If all goes as planned, this study will determine the quantitative importance of N2 fixation in the ETSP, and whether these previously undocumented rates can help resolve the marine N budget. Implications include the ability of the marine N cycle to maintain homeostasis, and thus the global C cycle on glacial/interglacial time scales.</p>
N2 fixation ETSP
largerWorkCitation
project
eng; USA
oceans
Eastern Tropical South Pacific
-100
-80
-20
-15
2010-02-01
2011-04-19
Eastern Tropical South Pacific
0
BCO-DMO catalogue of parameters from 15N2-based N2 fixation rates from the Eastern Tropical South Pacific collected on the R/V Atlantis (AT15-61) and R/V Melville (MV1104) in 2010-2011 (N2 fixation ETSP project)
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/555739.rdf
Name: date
Units: unitless
Description: <p>sample collection date (local). Format: yyyy-mm-dd</p>
http://lod.bco-dmo.org/id/dataset-parameter/555740.rdf
Name: station
Units: unitless
Description: <p>station</p>
http://lod.bco-dmo.org/id/dataset-parameter/555741.rdf
Name: lat
Units: decimal degrees
Description: <p>latitude; north is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/555742.rdf
Name: lon
Units: decimal degrees
Description: <p>longitude; east is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/555743.rdf
Name: depth
Units: meters
Description: <p>sample depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/555744.rdf
Name: Nfix_umol_N_m2_d
Units: umol N m-2 d-1
Description: <p>24 hr 15N2 fixation rate</p>
http://lod.bco-dmo.org/id/dataset-parameter/555745.rdf
Name: Nfix_stdev
Units: umol N m-2 d-1
Description: <p>24 hr 15N2 fixation rate standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/764193.rdf
Name: cruise_id
Units: unitless
Description: <p>cruise_id</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
https://doi.org/10.1575/1912/7227
download
onLine
dataset
<p><strong>Water column sample collection:</strong>&nbsp;Samples were collected on the R/V Atlantis in January through February 2010, and the R/V Melville in March through April 2011 on a zonal transect along 20º S between 80º W and 100º W, with exact station locations and sample depths, nutrient concentrations and isotopic compositions reported below. Water column samples were collected by Niskin bottles deployed on a rosette equipped with conductivity-temperature-depth (CTD) sensors. All samples were collected into acid-washed, sample-rinsed HDPE bottles, and samples from the upper 400 m passed a 0.2 µm filter before collection. All samples were stored at -20º C until analysis on land.</p>
<p><strong>15N2 fixation rate measurements</strong>: Short-term N2 fixation rate measurements incubated with 15N2 gas from Sigma Aldrich (lot #s SZ1670V and MBBB0968V) were carried out in acid-washed, sample-rinsed light transparent 4 L polycarbonate bottles amended with 1.5 mL of 99% 15N2&nbsp; and 1.5 mL of 0.5M NaH13CO3. Incubations were performed under simulated in situ conditions of temperature and light and run for staggered periods (e.g. 0, 12, 24 and 48 hrs). Incubations were terminated by filtration of the 4 L sample onto a precombusted 25 mm Whatman GF/F, which was then analyzed by mass spectrometry at the University of Southern California for d15N and d13C. During ESTP 1, periodic time zero incubations were measured, with samples filtered within 5 to 10 minutes of injection of 15N2. Zero time enrichments were typically near natural abundance levels with the greatest observed enrichment in 8 experiments at 23‰, essentially at natural abundance level for our tracer experiments. We assumed natural abundance (0.3663 atom %) for calculations. Limits of detection are about 10-14 µg for N and 6-10 µg for C. Reproducibility as the standard deviation for isotopic analysis is about ±0.3‰ for d15N and ±0.2‰ for d13C, and about ±0.1-0.2 µg for mass determinations.</p>
Specified by the Principal Investigator(s)
<p><strong>BCO-DMO Processing:</strong></p>
<p>- added conventional header with dataset name, PI name, version date<br />
- renamed parameters to BCO-DMO standard<br />
- added cruise id column</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
CTD
CTD
PI Supplied Instrument Name: CTD Instrument Name: CTD - profiler Instrument Short Name: Instrument Description: The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.
This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/130/
Gas Chromatograph
Gas Chromatograph
PI Supplied Instrument Name: Gas Chromatograph Instrument Name: Gas Chromatograph Instrument Short Name:Gas Chromatograph Instrument Description: Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC) Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB02/
Cruise: AT15-61
AT15-61
R/V Atlantis
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantis
vessel
AT15-61
Douglas G. Capone
University of Southern California
Cruise: MV1104
MV1104
R/V Melville
Community Standard Description
International Council for the Exploration of the Sea
R/V Melville
vessel
MV1104
William M. Berelson
University of Southern California
R/V Atlantis
Community Standard Description
International Council for the Exploration of the Sea
R/V Atlantis
vessel
R/V Melville
Community Standard Description
International Council for the Exploration of the Sea
R/V Melville
vessel