scholarly journals Interannual variability in net community production at the Western Antarctic Peninsula region (1997–2014)

2016 ◽  
Vol 121 (7) ◽  
pp. 4748-4762 ◽  
Author(s):  
Zuchuan Li ◽  
Nicolas Cassar ◽  
Kuan Huang ◽  
Hugh Ducklow ◽  
Oscar Schofield
Keyword(s):  
Interannual Variability ◽  
Antarctic Peninsula ◽  
Western Antarctic Peninsula ◽  
Net Community Production ◽  
Community Production

scholarly journals Specific eukaryotic plankton are good predictors of net community production in the Western Antarctic Peninsula

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yajuan Lin ◽  
Nicolas Cassar ◽  
Adrian Marchetti ◽  
Carly Moreno ◽  
Hugh Ducklow ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Western Antarctic Peninsula ◽  
Net Community Production ◽  
Community Production

scholarly journals Decline in plankton diversity and carbon flux with reduced sea ice extent along the Western Antarctic Peninsula

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yajuan Lin ◽  
Carly Moreno ◽  
Adrian Marchetti ◽  
Hugh Ducklow ◽  
Oscar Schofield ◽  
...  
Keyword(s):  
Sea Ice ◽  
Carbon Cycling ◽  
Antarctic Peninsula ◽  
Dominant Factor ◽  
Western Antarctic Peninsula ◽  
Net Community Production ◽  
Sea Ice Extent ◽  
Plankton Diversity ◽  
Mixed Layers ◽  
Community Production

AbstractSince the middle of the past century, the Western Antarctic Peninsula has warmed rapidly with a significant loss of sea ice but the impacts on plankton biodiversity and carbon cycling remain an open question. Here, using a 5-year dataset of eukaryotic plankton DNA metabarcoding, we assess changes in biodiversity and net community production in this region. Our results show that sea-ice extent is a dominant factor influencing eukaryotic plankton community composition, biodiversity, and net community production. Species richness and evenness decline with an increase in sea surface temperature (SST). In regions with low SST and shallow mixed layers, the community was dominated by a diverse assemblage of diatoms and dinoflagellates. Conversely, less diverse plankton assemblages were observed in waters with higher SST and/or deep mixed layers when sea ice extent was lower. A genetic programming machine-learning model explained up to 80% of the net community production variability at the Western Antarctic Peninsula. Among the biological explanatory variables, the sea-ice environment associated plankton assemblage is the best predictor of net community production. We conclude that eukaryotic plankton diversity and carbon cycling at the Western Antarctic Peninsula are strongly linked to sea-ice conditions.

scholarly journals 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

2018 ◽  
Vol 376 (2122) ◽  
pp. 20170177 ◽  
Author(s):  
Hugh W. Ducklow ◽  
Michael R. Stukel ◽  
Rachel Eveleth ◽  
Scott C. Doney ◽  
Tim Jickells ◽  
...  
Keyword(s):  
Sea Ice ◽  
Primary Production ◽  
Water Column ◽  
Antarctic Peninsula ◽  
Net Primary Production ◽  
Western Antarctic Peninsula ◽  
New Production ◽  
Net Community Production ◽  
Particle Export ◽  
Community Production

New production (New P, the rate of net primary production (NPP) supported by exogenously supplied limiting nutrients) and net community production (NCP, gross primary production not consumed by community respiration) are closely related but mechanistically distinct processes. They set the carbon balance in the upper ocean and define an upper limit for export from the system. The relationships, relative magnitudes and variability of New P (from 15 NO 3 – uptake), O 2  : argon-based NCP and sinking particle export (based on the 238 U :  234 Th disequilibrium) are increasingly well documented but still not clearly understood. This is especially true in remote regions such as polar marginal ice zones. Here we present a 3-year dataset of simultaneous measurements made at approximately 50 stations along the Western Antarctic Peninsula (WAP) continental shelf in midsummer (January) 2012–2014. Net seasonal-scale changes in water column inventories (0–150 m) of nitrate and iodide were also estimated at the same stations. The average daily rates based on inventory changes exceeded the shorter-term rate measurements. A major uncertainty in the relative magnitude of the inventory estimates is specifying the start of the growing season following sea-ice retreat. New P and NCP(O 2 ) did not differ significantly. New P and NCP(O 2 ) were significantly greater than sinking particle export from thorium-234. We suggest this is a persistent and systematic imbalance and that other processes such as vertical mixing and advection of suspended particles are important export pathways. This article is part of the theme issue ‘The marine system of the west Antarctic Peninsula: status and strategy for progress in a region of rapid change’.

scholarly journals Drivers of interannual variability in virioplankton abundance at the coastal western Antarctic peninsula and the potential effects of climate change

2017 ◽  
Vol 19 (2) ◽  
pp. 740-755 ◽  
Author(s):  
Claire Evans ◽  
Joost Brandsma ◽  
David W. Pond ◽  
Hugh J. Venables ◽  
Michael P. Meredith ◽  
...  
Keyword(s):  
Climate Change ◽  
Interannual Variability ◽  
Antarctic Peninsula ◽  
Western Antarctic Peninsula

Interannual variability of net community production and air-sea CO2 flux in a naturally iron fertilized region of the Southern Ocean (Kerguelen Plateau)

2011 ◽  
Vol 23 (6) ◽  
pp. 589-596 ◽  
Author(s):  
Marie Paule Jouandet ◽  
Stephane Blain ◽  
Nicolas Metzl ◽  
Mathieu Mongin
Keyword(s):  
Southern Ocean ◽  
Interannual Variability ◽  
Dissolved Inorganic Carbon ◽  
Co2 Flux ◽  
Biogeochemical Model ◽  
Unexpected Result ◽  
Kerguelen Plateau ◽  
Net Community Production ◽  
Productive Area ◽  
Community Production

AbstractThe interannual variability of net community production (NCP) and air-sea CO2 flux in a naturally iron fertilized and productive area of the Southern Ocean (Kerguelen plateau) was investigated using a 1D biogeochemical model driven by satellite chlorophyll, sea surface temperature and wind speed data for the 1997–2007 period. The model simulates the low fCO2 and dissolved inorganic carbon (DIC) measured during summers 2004–05, 2005–06, 2006–07 and the high NCP derived from a seasonal carbon budget in the surface waters of these blooms. Although satellite data show high interannual variability in the dynamics and magnitude of the bloom during the 1997–2007 decade, the simulated interannual variability of the NCP was only ± 14%. This unexpected result could be due to the combined effect of both the duration and the start date of the bloom, the latter determining the depth of the mixed layer used to compute the NCP. In the productive area, the interannual variability of air-sea CO2 flux (± 13%) was not only driven by the biological effect but also by the solubility effect. Our results contrast with previous studies in the high nutrient, low chlorophyll regions of the Southern Ocean.

Aerosol Marine Primary Carbohydrates and Atmospheric Transformation in the Western Antarctic Peninsula

2021 ◽  
Author(s):  
Sebastian Zeppenfeld ◽  
Manuela van Pinxteren ◽  
Dominik van Pinxteren ◽  
Heike Wex ◽  
Elisa Berdalet ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Western Antarctic Peninsula

scholarly journals Correction to: Summer phyto‑ and bacterioplankton communities during low and high productivity scenarios in the Western Antarctic Peninsula

Polar Biology ◽  
2021 ◽  
Author(s):  
Sebastián Fuentes ◽  
José Ignacio Arroyo ◽  
Susana Rodriguez‑Marconi ◽  
Italo Masotti ◽  
Tomás Alarcon‑Schumacher ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Western Antarctic Peninsula ◽  
High Productivity ◽  
Bacterioplankton Communities
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