Dataset: 32Si Profiles - from RR1813
Data Citation:
Brzezinski, M., Buck, K., Jenkins, B. (2020) 32Si data from EXPORTS cruise RR1813 on R/V Roger Revelle in the Subarctic North Pacific near Station PAPA from August to September 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-01-03 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.785856.1 [access date]
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This dataset is licensed under Creative Commons Attribution 4.0.
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DOI:10.1575/1912/bco-dmo.785856.1
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Spatial Extent: N:50.5925 E:-144.691 S:50.1496 W:-145.1413
Temporal Extent: 2018-08-16 - 2018-09-07
Program:
Principal Investigator:
Mark A. Brzezinski (University of California-Santa Barbara, UCSB-MSI)
Co-Principal Investigator:
Kristen Buck (University of South Florida, USF)
Bethany D. Jenkins (University of Rhode Island, URI)
Contact:
Janice L. Jones (University of California-Santa Barbara, UCSB)
BCO-DMO Data Manager:
Version:
1
Version Date:
2020-01-03
Restricted:
No
Current State:
Final no updates expected
32Si data from EXPORTS cruise RR1813 on R/V Roger Revelle in the Subarctic North Pacific near Station PAPA from August to September 2018
Abstract:
This dataset includes depth profiles in the euphotic zone of nutrient (nitrate, silicate, phosphate) concentrations and profiles of silicic acid uptake rates from EXPORTS cruise RR1813.
The EXPORTS field campaign in the subarctic North Pacific sampled an ecosystem characterized as high nutrient low chlorophyll (HNLC) due to low iron (Fe) levels that are primary controllers constraining phytoplankton utilization of other nutrients. It has been a paradigm in low Fe, HNLC systems that diatoms grow at elevated Si:C and Si:N ratios and should be efficiently exported as particles significantly enriched in Si relative to C. However, Fe limitation also alters diatoms species composition and the high Si demand imposed by low Fe can drive HNLC regions to Si limitation or Si/Fe co-limitation. Thus, the degree of Si and/or Fe stress in HNLC waters can all alter diatom taxonomic composition, the elemental composition of diatom cells, and the path cells follow through the food web ultimately altering diatom carbon export.
Within each ecosystem state examined in the EXPORTS program, nutrient biogeochemistry, diatom and phytoplankton community structure, and global diatom gene expression patterns (metatranscriptomics) are characterized in the lit ocean. Nutrient amendment experiments with tracer addition (14C, 32Si) are used to quantify the level of Si and Fe stress being experienced by the phytoplankton and to contextualize taxa-specific metatranscriptome responses for resolving gene expression profiles in the in situ communities.