Variation of the phytoplankton community across the subtropical convergence zone in the west pacific sector of the southern ocean during early austral Summer 1995/6

1998 ◽  
Vol 41 (2) ◽  
pp. 125-134
Author(s):  
Hak Young Lee ◽  
Richard M. Greene
Keyword(s):  
Southern Ocean ◽  
Phytoplankton Community ◽  
Austral Summer ◽  
Convergence Zone ◽  
The West ◽  
West Pacific ◽  
Subtropical Convergence Zone

scholarly journals Factors controlling coccolithophore biogeography in the Southern Ocean

2018 ◽  
Vol 15 (22) ◽  
pp. 6997-7024 ◽  
Author(s):  
Cara Nissen ◽  
Meike Vogt ◽  
Matthias Münnich ◽  
Nicolas Gruber ◽  
F. Alexander Haumann
Keyword(s):  
Southern Ocean ◽  
Phytoplankton Community ◽  
Net Primary Productivity ◽  
Austral Summer ◽  
Relative Importance ◽  
Biotic Factors ◽  
Top Down ◽  
Light Levels ◽  
Resolution Model ◽  
High Resolution Model

Abstract. The biogeography of Southern Ocean phytoplankton controls the local biogeochemistry and the export of macronutrients to lower latitudes and depth. Of particular relevance is the competitive interaction between coccolithophores and diatoms, with the former being prevalent along the “Great Calcite Belt” (40–60∘ S), while diatoms tend to dominate the regions south of 60∘ S. To address the factors controlling coccolithophore distribution and the competition between them and diatoms, we use a regional high-resolution model (ROMS–BEC) for the Southern Ocean (24–78∘ S) that has been extended to include an explicit representation of coccolithophores. We assess the relative importance of bottom-up (temperature, nutrients, light) and top-down (grazing by zooplankton) factors in controlling Southern Ocean coccolithophore biogeography over the course of the growing season. In our simulations, coccolithophores are an important member of the Southern Ocean phytoplankton community, contributing 17 % to annually integrated net primary productivity south of 30∘ S. Coccolithophore biomass is highest north of 50∘ S in late austral summer, when light levels are high and diatoms become limited by silicic acid. Furthermore, we find top-down factors to be a major control on the relative abundance of diatoms and coccolithophores in the Southern Ocean. Consequently, when assessing potential future changes in Southern Ocean coccolithophore abundance, both abiotic (temperature, light, and nutrients) and biotic factors (interaction with diatoms and zooplankton) need to be considered.

Meridional distribution of 226Ra in the west pacific and the southern ocean surface waters

2011 ◽  
Vol 29 (6) ◽  
pp. 1224-1236 ◽  
Author(s):  
Zhigang Chen ◽  
Yipu Huang ◽  
Min Chen ◽  
Pinghe Cai ◽  
Na Xing ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Surface Waters ◽  
Ocean Surface ◽  
The West ◽  
West Pacific

scholarly journals Variations of net primary productivity and phytoplankton community composition in the Indian sector of the Southern Ocean as estimated from ocean color remote sensing data

2012 ◽  
Vol 9 (10) ◽  
pp. 3875-3890 ◽  
Author(s):  
S. Takao ◽  
T. Hirawake ◽  
S. W. Wright ◽  
K. Suzuki
Keyword(s):  
Southern Ocean ◽  
Community Composition ◽  
Primary Productivity ◽  
Phytoplankton Community ◽  
Net Primary Productivity ◽  
Austral Summer ◽  
Remote Sensing Data ◽  
The Past ◽  
Phytoplankton Community Composition ◽  
Indian Sector

Abstract. Phytoplankton population dynamics play an important role in biogeochemical cycles in the Southern Ocean during austral summer. Recent environmental changes such as a rise in sea surface temperature (SST) are likely to impact on net primary productivity (NPP) and phytoplankton community composition. However, their spatiotemporal relationships are still unclear in the Southern Ocean. Here we assessed the relationships between NPP, dominant phytoplankton groups, and SST in the Indian sector of the Southern Ocean over the past decade (1997–2007) using satellite remote sensing data. As a result, we found a statistically significant reduction in NPP in the polar frontal zone over the past decade during austral summer. Moreover, the decrease in NPP positively correlated with the dominance of diatoms (Kendall's rank correlation τ = 0.60) estimated by a phytoplankton community composition model, but not correlated with SST. In the seasonal ice zone, NPP correlated with not only the dominance of diatoms positively (τ = 0.56), but also the dominance of haptophytes (τ = −0.54) and SST (τ = −0.54) negatively. Our results suggested that summer NPP values were strongly affected by the phytoplankton community composition in the Indian sector of the Southern Ocean.

scholarly journals Factors controlling coccolithophore biogeography in the Southern Ocean

2018 ◽  
Author(s):  
Cara Nissen ◽  
Meike Vogt ◽  
Matthias Münnich ◽  
Nicolas Gruber ◽  
F. Alexander Haumann
Keyword(s):  
Southern Ocean ◽  
Phytoplankton Community ◽  
Net Primary Productivity ◽  
Austral Summer ◽  
Relative Importance ◽  
Biotic Factors ◽  
Top Down ◽  
Light Levels ◽  
Resolution Model ◽  
High Resolution Model

Abstract. The biogeography of Southern Ocean phytoplankton controls not only the local biogeochemistry, but also the export of macronutrients to lower latitudes and depth. Of particular relevance is the interaction between coccolithophores and diatoms, with the former being prevalent along the "Great Calcite Belt" (40–60° S), while diatoms tend to dominate the regions south of 60° S. To address the factors controlling coccolithophore distribution and the competition between them and diatoms, we use a regional high-resolution model (ROMS-BEC) for the Southern Ocean (24–78° S) that has been extended to include an explicit representation of coccolithophores. We assess the relative importance of bottom-up (temperature, nutrients, light) and top-down (grazing by zooplankton) factors in controlling Southern Ocean coccolithophore biogeography over the course of the growing season. In our simulations, coccolithophores are an important member of the Southern Ocean phytoplankton community, contributing 15 % to annually integrated net primary productivity south of 30° S. Coccolithophore biomass is highest north of 50° S in late austral summer, when light levels are high and diatoms become silicate limited. Furthermore, we find top-down factors to be a major control on the relative abundance of diatoms and coccolithophores in the Southern Ocean. Consequently, when assessing potential future changes in Southern Ocean coccolithophore abundance, both abiotic (temperature, light, nutrients, pH) and biotic factors (interaction with diatoms and zooplankton) need to be considered.

scholarly journals Variations of net primary productivity and phytoplankton community composition in the Southern Ocean as estimated from ocean-color remote sensing data

2012 ◽  
Vol 9 (4) ◽  
pp. 4361-4398 ◽  
Author(s):  
S. Takao ◽  
T. Hirawake ◽  
S. W. Wright ◽  
K. Suzuki
Keyword(s):  
Remote Sensing ◽  
Southern Ocean ◽  
Community Composition ◽  
Primary Productivity ◽  
Phytoplankton Community ◽  
Net Primary Productivity ◽  
Austral Summer ◽  
Remote Sensing Data ◽  
The Past ◽  
Phytoplankton Community Composition

Abstract. Phytoplankton population dynamics play an important role in biogeochemical cycles in the Southern Ocean during austral summer. Recent environmental changes such as a rise in sea surface temperature (SST) are likely to impact on net primary productivity (NPP) and phytoplankton community composition. However, their spatiotemporal relationships are still unclear in the Southern Ocean. Here we assessed the relationships between NPP, dominant phytoplankton groups, and SST in the Indian sector of the Southern Ocean over the past decade (1997–2007) using satellite remote sensing data. As a result, we found a statistically significant reduction in NPP in the polar frontal zone over the past decade during austral summer. Moreover, the decrease in NPP positively correlated with the dominance of diatoms (Kendall's rank correlation τ = 0.60) estimated by a phytoplankton community composition model, but not correlated with SST. In the seasonal ice zone, NPP correlated with not only the dominance of diatoms positively (τ = 0.56), but also the dominance of haptophytes (τ = −0.54) and SST (τ = −0.54) negatively. Our results suggested that summer NPP values were strongly affected by the phytoplankton community composition in the Southern Ocean.

The West Pacific Rim: An Introduction

1994 ◽  
Vol 160 (3) ◽  
pp. 340
Author(s):  
Richard Louis Edmonds ◽  
Rupert Hodder
Keyword(s):  
Pacific Rim ◽  
The West ◽  
West Pacific
Sign in / Sign up

Export Citation Format

Share Document