Contributors | Affiliation | Role |
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Church, Matthew J. | University of Hawai'i (UH) | Principal Investigator |
Letelier, Ricardo | Oregon State University (OSU-CEOAS) | Co-Principal Investigator |
McKee, Theresa | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
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.
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
The processing of the data was followed by the standard procedures of the HOT program:
http://hahana.soest.hawaii.edu/hot/protocols/protocols.html
File |
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N2fix_CO2_WS.csv (Comma Separated Values (.csv), 152.83 KB) MD5:457ccb89108e021c39acbb0fc94af57f Primary data file for dataset ID 4011 |
Parameter | Description | Units |
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 |
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. |
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. |
Website | |
Platform | R/V Kilo Moana |
Report | |
Start Date | 2011-03-12 |
End Date | 2011-03-23 |
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.
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.
Funding Source | Award |
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NSF Division of Ocean Sciences (NSF OCE) |