Water samples from R/V Kilo Moana cruises in the North Pacific Subtropical Gyre near Station ALOHA (DIAZOTROPHS-CO2 project)

Website: https://www.bco-dmo.org/dataset/4011
Version:
Version Date: 2013-08-19

Project
» Oceanic diazotroph community structure and activities in a high carbon dioxide world (DIAZOTROPHS-CO2)

Program
» Ocean Carbon and Biogeochemistry (OCB)
ContributorsAffiliationRole
Church, Matthew J.University of Hawai'i (UH)Principal Investigator
Letelier, RicardoOregon State University (OSU-CEOAS)Co-Principal Investigator
McKee, TheresaWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Dataset Description

Biogeochemical data from water samples collected in the area around Station ALOHA (22° 45’N, 158° 00’W) during the summer (August 2010) and spring period (March 2011) .  An assessment of dinitrogen fixation rates and nifH community structure are published as a separate dataset.


Methods & Sampling

Sampling and analytical methods were conducted following the field and laboratory protocols used by the Hawaii Ocean Time-series. These protocols can be found at:
http://hahana.soest.hawaii.edu/hot/protocols/protocols.html

 


Data Processing Description

The processing of the data was followed by the standard procedures of the HOT program:
http://hahana.soest.hawaii.edu/hot/protocols/protocols.html


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Data Files

File
N2fix_CO2_WS.csv
(Comma Separated Values (.csv), 152.83 KB)
MD5:457ccb89108e021c39acbb0fc94af57f
Primary data file for dataset ID 4011

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Parameters

ParameterDescriptionUnits
cruise_id

Cruise identifier

text
sta

station identifier

integer
cast

cast number

integer
date

date of sample

YYYYMMDD
year

year of sample

YYYY
month

month of sample

MM
day

day of sample

DD
time

time of sample

HHMM
lat

latitude of sample

degrees
lon

longitude of sample

degrees
bot_NIS

Niskin bottle number

integer
depth

depth of sample

meters
potemp

Potential Temperature

ITS-90
density

Density

kg/m3
DIC

Dissolved Organic Carbon

umol/L
TALK

Total Alkalinity

umol/L
pH

pH

dimensionless
chl_a

chlorophyll_A

ug/L
PO4

Particulate Phosphate

umol/L
NO3_NO2

Nitrate plus Nitrite

umol/L
SiO4

Silicate

umol/L
LLP

Low-level Phosphorus

ng/L
PP

Primary Production

nmol/L
UCYN_A

UCYN_A count

copies/L
crocos

crocosphaera count

copies/L
tricho

trichodesmium count

copies/L
het_1

Heterocyst 1 count

copies/L
het_2

Heterocyst 2 count

copies/L
het_3

Heterocyst 3 count

copies/L
taxon

taxonomic group

text
count

Number of individuals counted in sample or sample fraction

copies/liter


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Instruments

Dataset-specific Instrument Name
Niskin bottle
Generic Instrument Name
Niskin bottle
Generic Instrument 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.


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Deployments

KM1016

Website
Platform
R/V Kilo Moana
Report
Start Date
2010-08-20
End Date
2010-08-30
Description
Cruise information and original data are available from the NSF R2R data catalog.

KM1110

Website
Platform
R/V Kilo Moana
Report
Start Date
2011-03-12
End Date
2011-03-23


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Project Information

Oceanic diazotroph community structure and activities in a high carbon dioxide world (DIAZOTROPHS-CO2)


The North Pacific Subtropical Gyre (NPSG) is the largest ocean ecosystem on Earth, playing a prominent role in global carbon cycling and forming an important reservoir of marine biodiversity. Nitrogen (N2) fixing bacteria (termed diazotrophs) provide a major source of new nitrogen to the oligotrophic waters of the NPSG, thereby exerting direct control on the carbon cycle. Oceanic uptake of CO2 causes long-term changes in the partial pressure of CO2 (pCO2) in the seawater of this ecosystem. Therefore, understanding how carbon system perturbations may influence ocean biogeochemistry is an important and timely undertaking.

In this project, the investigators will examine how natural assemblages of N2 fixing microorganisms respond to perturbations in seawater carbon chemistry. Laboratory and field-based experiments will be placed in the context of monthly time series measurements on the activities and abundances of N2 fixing microorganism abundances. Together, the project will provide insight into the dependence of N2 fixing microorganism physiology on variations in CO2. The broad objectives of the research are: (1) Quantify the responses and consequences of changes in seawater pCO2 on the growth and community structure of naturally-occurring assemblages of ocean diazotrophs; (2) Identify why and how changes in seawater pCO2 influence the growth and carbon acquisition strategies of two model marine diazotrophs (Trichodesmium and Crocosphaera); and (3) Quantify temporal variability in diazotroph community structure and activities at Station ALOHA.

This is a Collaborative Research award.



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Program Information

Ocean Carbon and Biogeochemistry (OCB)


Coverage: Global


The Ocean Carbon and Biogeochemistry (OCB) program focuses on the ocean's role as a component of the global Earth system, bringing together research in geochemistry, ocean physics, and ecology that inform on and advance our understanding of ocean biogeochemistry. The overall program goals are to promote, plan, and coordinate collaborative, multidisciplinary research opportunities within the U.S. research community and with international partners. Important OCB-related activities currently include: the Ocean Carbon and Climate Change (OCCC) and the North American Carbon Program (NACP); U.S. contributions to IMBER, SOLAS, CARBOOCEAN; and numerous U.S. single-investigator and medium-size research projects funded by U.S. federal agencies including NASA, NOAA, and NSF.

The scientific mission of OCB is to study the evolving role of the ocean in the global carbon cycle, in the face of environmental variability and change through studies of marine biogeochemical cycles and associated ecosystems.

The overarching OCB science themes include improved understanding and prediction of: 1) oceanic uptake and release of atmospheric CO2 and other greenhouse gases and 2) environmental sensitivities of biogeochemical cycles, marine ecosystems, and interactions between the two.

The OCB Research Priorities (updated January 2012) include: ocean acidification; terrestrial/coastal carbon fluxes and exchanges; climate sensitivities of and change in ecosystem structure and associated impacts on biogeochemical cycles; mesopelagic ecological and biogeochemical interactions; benthic-pelagic feedbacks on biogeochemical cycles; ocean carbon uptake and storage; and expanding low-oxygen conditions in the coastal and open oceans.



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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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