Bottle data and chemical analysis from Falkor cruise FK180624 in the Eastern Tropical North Pacific Ocean in 2018

Website: https://www.bco-dmo.org/dataset/832389
Data Type: Cruise Results
Version: 1
Version Date: 2020-12-02

Project
» Solving Microbial Mysteries with Autonomous Technology (Microbial Mysteries)
ContributorsAffiliationRole
Babbin, Andrew R.Massachusetts Institute of Technology (MIT)Principal Investigator, Contact
Casciotti, Karen L.Stanford UniversityPrincipal Investigator
Woosley, RyanMassachusetts Institute of Technology (MIT)Co-Principal Investigator
Soenen, KarenWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
Bottle data and chemical analysis from Falkor cruise FK180624 in the Eastern Tropical North Pacific Ocean in 201


Coverage

Spatial Extent: N:18.00001 E:-101.99474 S:13.99251 W:-119.002069
Temporal Extent: 2018-06-30 - 2018-07-13

Acquisition Description

The samples were taken using a 24-bottle CTD rosette with 12L bottles. Depths varied per station but were focused in the upper 1000m. 19 stations were sampled with 22 casts total.

Samples were drawn in order: pH, alkalinity, NH4, nutrients (NOx, PO4, NO2). pH, NH4, PO4, NO2 were measured within 3 hours of collection onboard. NOx were filtered (0.22um Sterivex) and frozen. NOx is generally a mean of 3 measurements. Alkalinity were poisoned with a saturated HgCl2 solution and preserved in 160mL crimped serum bottles.


Processing Description

The samples were analysed using the following instruments:

  • NO2, PO4: Ocean Optics QEPRO spectrophotometer with 10cm Starna flow through quartz cell
  • NOx: Teledyne T200 NOx analyzer with custom front end for vanadium reduction
  • pH: Agilent 8454 spectrophotometer with custom front end for automated syringe injection
  • Alkalinity: Custom total alkalinity titrator built by the lab of Andrew Dickson, UCSD-Scripps

BCO-DMO processing notes:

  • Added ISO_DateTime_UTC column
  • Added cruise id

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Parameters

ParameterDescriptionUnits
CRUISEIDcruide identifier unitless
EXPOCODEcruise EXPO code unitless
STNNBRstation number unitless
CASTNOcast number unitless
SAMPNOsample number unitless
DATEsampling date in pacific daylight time (PDT), format:dd-mm-yyy unitless
TIMEtime in pacific daylight time (PDT), format: hh:mm:ss unitless
LATITUDElatitude, south is negative decimal degrees
LONGITUDElongitude, west is negative decimal degrees
BOTTOM_DEPTHbottom depth of ocean meters (m)
CTDPRSCTD pressure decibar (dbar)
CTDTMPCTD temperature, International Temperature Scale of 1990 (ITS-90) degrees Celsius (°C)
CTDSALCTD salinity, Practical Salinity Scale - 1978 PSU
CTDS_FLAG_WCTD salinity flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn unitless
CTDOXYCTD oxygen micromoles per liters (umol/l)
CTDOXY_FLAG_Woxygen flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn unitless
FLORcalibrated fluoresence from CTD micrograms per liters (ug/l)
FLOR_FLAG_Wfluoresence flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn. unitless
NOxnitrate + nitrite micromoles per liters (umol/l)
NOx_FLAG_Wtotal NOx flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn. unitless
NOx_stdevstandard deviation of NOx micromoles per liters (umol/l)
NOx_STD_FLAG_Wflag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn. unitless
NITRIT_BabLabnitrite micromoles per liters (umol/l)
NITRIT_FLAG_Wnitrite flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn. unitless
PHSPHTphosphate micromoles per liters (umol/l)
PHSPHT_FLAG_Wphosphate flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn. unitless
NH4ammonium micromoles per liters (umol/l)
NH4_FLAG_Wammonium flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn. unitless
PH_TOTpH on the total scale at 25C unitless
PH_TOT_FLAG_WpH flag unitless
PH_TEMPtemperature of pH measurements degrees Celsius (°C)
TAtotal alkalinity micromoles per kilograms (umol/kg)
TA_FLAG_Wtotal alkalinity flag. WOCE standard, with 2 = good, 3 = questionable, 6 = mean of replicates, 9 = sample not drawn. unitless
ISO_DateTime_UTCDate and time of sample and data collection in UTC, standard ISO format (yyyy-mm-ddThh:mmZ) unitless


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Instruments

Dataset-specific Instrument Name
Custom total alkalinity titrator
Generic Instrument Name
Automatic titrator
Dataset-specific Description
Custom total alkalinity titrator built by the lab of Andrew Dickson, UCSD-Scripps
Generic Instrument Description
Instruments that incrementally add quantified aliquots of a reagent to a sample until the end-point of a chemical reaction is reached.

Dataset-specific Instrument Name
Ocean Optics QEPRO spectrophotometer
Generic Instrument Name
Spectrophotometer
Dataset-specific Description
NO2, PO4: Ocean Optics QEPRO spectrophotometer with 10cm Starna flow through quartz cell
Generic Instrument Description
An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples.

Dataset-specific Instrument Name
Agilent 8454 spectrophotometer
Generic Instrument Name
Spectrophotometer
Dataset-specific Description
pH: Agilent 8454 spectrophotometer with custom front end for automated syringe injection
Generic Instrument Description
An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples.

Dataset-specific Instrument Name
Teledyne T200 NOx analyzer
Generic Instrument Name
Chemiluminescence NOx Analyzer
Dataset-specific Description
NOx: Teledyne T200 NOx analyzer with custom front end for vanadium reduction.
Generic Instrument Description
The chemiluminescence method for gas analysis of oxides of nitrogen relies on the measurement of light produced by the gas-phase titration of nitric oxide and ozone. A chemiluminescence analyzer can measure the concentration of NO/NO2/NOX. One example is the Teledyne Model T200: http://www.teledyne-api.com/products/T200.asp


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Deployments

FK180624

Website
Platform
R/V Falkor
Start Date
2018-06-24
End Date
2018-07-15


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Project Information

Solving Microbial Mysteries with Autonomous Technology (Microbial Mysteries)


Coverage: Eastern Tropical North Pacific Ocean


Phytoplankton form the base of the marine food web. These microscopic, single-celled organisms float in seawater, taking in carbon dioxide and using light energy to make carbohydrates. Like land plants, phytoplankton need other elements and compounds (fertilizer) to perform photosynthesis in order to survive and thrive: Nitrogen is one of these key ingredients for phytoplankton growth.

Nitrogen is fascinating and somewhat unique because it cycles through many oxygenation states. This means that there is plenty of energy for organisms to harness and the nitrogen cycle can be used as a lens to understand microbial communities. The quantity of “fixed nitrogen” in the ocean, usually nitrate (NO3–) and ammonium (NH4+), is critical for the existence and development of phytoplankton, and plays a role in the biological carbon pump sequestering carbon dioxide from the atmosphere.

Being able to recognize the role of fixed nitrogen in ocean processes is important for understanding low-oxygen areas in the world’s oceans. Insight into microbial interactions in oxygen deficient waters will allow researchers to better predict the marine response to increased nutrient runoff, eutrophication, and hypoxia – all of which currently threaten the livelihoods of many coastal communities as a warming climate leads to the expansion of low oxygen “dead” zones.

Data Management Plan: The resulting shipboard dataset is being archived at Rolling Deck to Repository and is now available. ADCP data is curated and processed by University of Hawaii.Iodine Speciation measurements are archived in BCO-DMO



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Funding

Funding SourceAward
Schmidt Ocean Institute (SOI)

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