IEDA
Project Information
Biological and Physical Drivers of Oxygen Saturation and Net Community Production Variability along the Western Antarctic Peninsula
Start Date:
2016-06-15
End Date:
2023-07-15
Description/Abstract
This project seeks to make detailed measurements of the oxygen content of the surface ocean along the Western Antarctic Peninsula. Detailed maps of changes in net oxygen content will be combined with measurements of the surface water chemistry and phytoplankton distributions. The project will determine the extent to which on-shore or offshore phytoplankton blooms along the peninsula are likely to lead to different amounts of carbon being exported to the deeper ocean. The project will analyze oxygen in relation to argon that will allow determination of the physical and biological contributions to surface ocean oxygen dynamics. These assessments will be combined with spatial and temporal distributions of nutrients (iron and macronutrients) and irradiances. This will allow the investigators to unravel the complex interplay between ice dynamics, iron and physical mixing dynamics as they relate to Net Community Production (NCP) in the region. NCP measurements will be normalized to Particulate Organic Carbon (POC) and be used to help identify area of "High Biomass and Low NCP" and those with "Low Biomass and High NCP" as a function of microbial plankton community composition. The team will use machine learning methods- including decision tree assemblages and genetic programming- to identify plankton groups key to facilitating biological carbon fluxes. Decomposing the oxygen signal along the West Antarctic Peninsula will also help elucidate biotic and abiotic drivers of the O2 saturation to further contextualize the growing inventory of oxygen measurements (e.g. by Argo floats) throughout the global oceans.
Personnel
Person Role
Cassar, Nicolas Investigator and contact
Lin, Yajuan Researcher
Hagge, Perrin Researcher
de Souza, Ariana Researcher
Gu, Shuai Researcher
Funding
Antarctic Organisms and Ecosystems Award # 1643534
AMD - DIF Record(s)
Deployment
Deployment Type
Deployment of Equilibrator Inlet Mass Spectrometer and molecular sampling on Palmer LTER grid ship expedition
Data Management Plan
None in the Database
Product Level:
1 (processed data)
Datasets
Repository Title (link) Format(s) Status
NCBI Palmer LTER 18S rRNA gene metabarcodin Not Provided exists
NCBI rDNA amplicon sequencing of WAP microbial community Not Provided exists
Publications
  1. Li, Z., Lozier, M. S., Cassar, N. 2021. Southern Ocean mixed layer dynamics and net community production on intra-seasonal, seasonal, interannual, and multi-year timescales. Journal of Geophysical Research – Oceans (doi:10.1029/2021JC017537)
  2. Lin, Y., Moreno, C., Marchetti, A., Ducklow, H., Schofield, O., Delage, E., … Cassar, N. (2021). Decline in plankton diversity and carbon flux with reduced sea ice extent along the Western Antarctic Peninsula. Nature Communications, 12(1). (doi:10.1038/s41467-021-25235-w)
  3. Brown, M. S., Bowman, J. S., Lin, Y., Feehan, C. J., Moreno, C. M., Cassar, N., … Schofield, O. M. (2021). Low diversity of a key phytoplankton group along the West Antarctic Peninsula. Limnology and Oceanography. (doi:10.1002/lno.11765)
  4. Lin, Y., Gifford, S., Ducklow, H., Schofield, O., & Cassar, N. (2019). Towards Quantitative Microbiome Community Profiling Using Internal Standards. Applied and Environmental Microbiology, 85(5). (doi:10.1128/aem.02634-18)
  5. Ducklow, H. W., Stukel, M. R., Eveleth, R., Doney, S. C., Jickells, T., Schofield, O., … Cassar, N. (2018). Spring–summer net community production, new production, particle export and related water column biogeochemical processes in the marginal sea ice zone of the Western Antarctic Peninsula 2012–2014. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 376(2122), 20170177. (doi:10.1098/rsta.2017.0177)
  6. Moreno, C.M. et al. 2018. Examination of gene repertoires and physiological responses to iron and light limitation in Southern Ocean diatoms. Polar Biology. (doi:10.1007/s00300-017-2228-7 )
  7. Lin Y. et al. (2017) Specific eukaryotic plankton are good predictors of net community production in the Western Antarctic Peninsula. Scientific Reports. 7: 14845. (doi:10.1038/s41598-017-14109-1)
Platforms and Instruments

This project has been viewed 3 times since May 2019 (based on unique date-IP combinations)