<div><p>Sea ice was collected using a trace metal clean Kovacs T-handle corer to collect 1 m long cores at 6 sea ice stations along the Canada Basin transect. Snow was collected into precleaned HDPE bottles, while seawater was pumped from beneath the sampled sea ice hole into a carboy and filtered into pre-cleaned bottles aboard the Healy. All samples were stored frozen until analyses or further sample prep could take place. Ice cores were bagged and stored at -20 degrees celsius onboard until cores could be cut and sub-sectioned in a cold room at University of Washington in Seattle prior to shipment back to Brown University.</p>
<p>Concentration analysis of samples was completed using an automated colorimetric system (WestCo SmartChem 200); the pooled standard deviation of control standards run within each sample set run was 0.3 micromoles per Liter (6.2 ppb nitrate); detection limit was 0.09 micromoles per Liter. Based upon nitrate concentration, 20 nmol of N were injected into vials containing denitrifying bacteria to convert nitrate to nitrous oxide for isotopic analysis on a ThermoFisher Delta V isotope ratio mass spectrometer. Analysis for d15N and d18O of nitrate are described in Sigman et al. (Analytical Chemistry; 2001), Casciotti et al. (Analytical Chemistry; 2002), McIlvin and Casciotti (Analytical Chemistry; 2011). Kaiser et al. (Analytical Chemistry; 2007) describes similar methodology for the determination of D17O of nitrate. D17O analyses require 50 nmol of N for complete analysis.</p></div>
Nitrate (NO3) and oxygen & deuterium isotopic composition from ice pond samples collected on the US GEOTRACES Arctic cruise, HLY1502
<div><p>This dataset contains concentration of nitrate, and oxygen and deuterium isotopic composition of ice pond samples collected during the U.S. GEOTRACES ARCTIC research cruise in 2015.</p></div>
GN01 Ice Pond NO3 H2O
<div><p>NOTES: No isotope measurements for N and O of nitrate due to such low concentrations. No detectable ammonium for concentration or isotopic analysis.</p>
<p>Oxygen and hydrogen isotope ratios of water (d18O-H2O <em>vs.</em> VSMOW, dD-H2O vs. VSMOW) were measured using wavelength-scanned cavity-down ring spectroscopy on a Picarro L1102-I liquid analyzer calibrated to international reference standards USGS46, USGS49 and VSMOW. Raw data are corrected for memory and drift effects followed by normalization using a standard calibration (Vaughn and Claymoore, INSTAAR, University of Colorado). Precision for d18O and dD was better than ±0.1 and ±0.4 per mil, respectively, based upon repeated measures of an internal standard (BW-1). </p>
<p>BCO-DMO Processing:<br />
- modified parameter names (replaced spaces with underscores);<br />
- separated Dates_of_collection field into Date_Start and Date_End (yyyy-mm-dd).</p></div>
753784
GN01 Ice Pond NO3 H2O
2019-01-24T12:23:50-05:00
2019-01-24T12:23:50-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:753784
Nitrate (NO3) and oxygen & deuterium isotopic composition from ice pond samples collected on the US GEOTRACES Arctic cruise (HLY1502) from August to October 2015
false
Hastings, M., Granger, J. (2019) Nitrate (NO3) and oxygen & deuterium isotopic composition from ice pond samples collected on the US GEOTRACES Arctic cruise (HLY1502) from August to October 2015. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-01-24 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/753784 [access date]
true
1
false
2019-01-24
HTML
https://www.bco-dmo.org/dataset/753784
text/html
Datapackage.json
Frictionless Data Package
https://www.bco-dmo.org/dataset/753784/datapackage.json
application/vnd.datapackage+json
PDF
https://www.bco-dmo.org/dataset/753784/Dataset_description.pdf
application/pdf
JSON-LD
https://www.bco-dmo.org/dataset/753784.json
application/ld+json
Turtle
https://www.bco-dmo.org/dataset/753784.ttl
text/turtle
RDF/XML
https://www.bco-dmo.org/dataset/753784.rdf
application/rdf+xml
ISO 19115-2 (NOAA Profile)
https://www.bco-dmo.org/dataset/753784/iso
application/xml
http://www.isotc211.org/2005/gmd-noaa
Dublin Core
https://www.bco-dmo.org/dataset/753784/dublin-core
application/xml
http://purl.org/dc/elements/1.1/
753784
http://lod.bco-dmo.org/id/dataset/753784
2015-08-09 - 2015-10-12
2015-08-09
2015-08-09
---09
220
--08
2015
2015-10-12
2015-10-12
---12
284
--10
2015
OSPREY
http://www.opengis.net/def/crs/OGC/1.3/CRS84
<http://www.opengis.net/def/crs/OGC/1.3/CRS84> POLYGON((-150.54 82.49, 3.529 82.49, 3.529 82.49, 3.529 89.96, -150.54 89.96, -150.54 82.49))
-150.54
82.49
3.529
89.96
86.225000000000
-73.505500000000