scholarly journals Enhanced North Pacific subtropical gyre circulation during the late Holocene

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yancheng Zhang ◽  
Xufeng Zheng ◽  
Deming Kong ◽  
Hong Yan ◽  
Zhonghui Liu
Keyword(s):  
North Pacific ◽  
Late Holocene ◽  
Warm Pool ◽  
Subtropical Gyre ◽  
North Pacific Subtropical Gyre ◽  
The North ◽  
Basin Scale ◽  
Future Global Warming ◽  
Gyre Circulation ◽  
The North Pacific

AbstractThe North Pacific Subtropical Gyre circulation redistributes heat from the Western Pacific Warm Pool towards the mid- to high-latitude North Pacific. However, the driving mechanisms of this circulation and how it changed over the Holocene remain poorly understood. Here, we present alkenone-based sea surface temperature reconstructions along the Kuroshio, California and Alaska currents that cover the past ~7,000 years. These and other paleorecords collectively demonstrate a coherent intensification of the boundary currents, and thereby the basin-scale subtropical gyre circulation, since ~3,000–4,000 years ago. Such enhanced circulation during the late Holocene appears to have resulted from a long-term southward migration of the Intertropical Convergence Zone, associated with Holocene ocean cooling. Our results imply that the North Pacific Subtropical Gyre circulation could be weakened under future global warming.

scholarly journals Climate-driven oscillation of phosphorus and iron limitation in the North Pacific Subtropical Gyre

2019 ◽  
Vol 116 (26) ◽  
pp. 12720-12728 ◽  
Author(s):  
Ricardo M. Letelier ◽  
Karin M. Björkman ◽  
Matthew J. Church ◽  
Douglas S. Hamilton ◽  
Natalie M. Mahowald ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
North Pacific ◽  
Subtropical Gyre ◽  
Future Climate Change ◽  
Northwest Pacific ◽  
Climate Change Scenarios ◽  
North Pacific Subtropical Gyre ◽  
The North ◽  
Basin Scale ◽  
The North Pacific

The supply of nutrients is a fundamental regulator of ocean productivity and carbon sequestration. Nutrient sources, sinks, residence times, and elemental ratios vary over broad scales, including those resulting from climate-driven changes in upper water column stratification, advection, and the deposition of atmospheric dust. These changes can alter the proximate elemental control of ecosystem productivity with cascading ecological effects and impacts on carbon sequestration. Here, we report multidecadal observations revealing that the ecosystem in the eastern region of the North Pacific Subtropical Gyre (NPSG) oscillates on subdecadal scales between inorganic phosphorus (Pi) sufficiency and limitation, when Piconcentration in surface waters decreases below 50–60 nmol⋅kg−1. In situ observations and model simulations suggest that sea-level pressure changes over the northwest Pacific may induce basin-scale variations in the atmospheric transport and deposition of Asian dust-associated iron (Fe), causing the eastern portion of the NPSG ecosystem to shift between states of Fe and Pilimitation. Our results highlight the critical need to include both atmospheric and ocean circulation variability when modeling the response of open ocean pelagic ecosystems under future climate change scenarios.

scholarly journals Euphotic zone metabolism in the North Pacific Subtropical Gyre based on oxygen dynamics

2020 ◽  
Author(s):  
Sara Ferron ◽  
Benedetto Barone ◽  
Matthew J Church ◽  
Angelicque E. White ◽  
David M. Karl
Keyword(s):  
North Pacific ◽  
Euphotic Zone ◽  
Subtropical Gyre ◽  
North Pacific Subtropical Gyre ◽  
The North ◽  
Oxygen Dynamics ◽  
The North Pacific

Weakening and Poleward Shifting of the North Pacific Subtropical Fronts from 1980 to 2018

2021 ◽  
Keyword(s):  
Mixed Layer ◽  
North Pacific ◽  
Subtropical Gyre ◽  
Hadley Cell ◽  
North Pacific Subtropical Gyre ◽  
Mode Water ◽  
Mode Waters ◽  
The North ◽  
The North Pacific ◽  
Subtropical Fronts

Abstract Recent evidence shows that the North Pacific subtropical gyre, the Kuroshio Extension (KE) and Oyashio Extension (OE) fronts have moved poleward in the past few decades. However, changes of the North Pacific Subtropical Fronts (STFs), anchored by the North Pacific subtropical countercurrent in the southern subtropical gyre, remain to be quantified. By synthesizing observations, reanalysis, and eddy-resolving ocean hindcasts, we show that the STFs, especially their eastern part, weakened (20%±5%) and moved poleward (1.6°±0.4°) from 1980 to 2018. Changes of the STFs are modified by mode waters to the north. We find that the central mode water (CMW) (180°-160°W) shows most significant weakening (18%±7%) and poleward shifting (2.4°±0.9°) trends, while the eastern part of the subtropical mode water (STMW) (160°E-180°) has similar but moderate changes (10% ± 8%; 0.9°±0.4°). Trends of the western part of the STMW (140°E-160°E) are not evident. The weakening and poleward shifting of mode waters and STFs are enhanced to the east and are mainly associated with changes of the northern deep mixed layers and outcrop lines—which have a growing northward shift as they elongate to the east. The eastern deep mixed layer shows the largest shallowing trend, where the subduction rate also decreases the most. The mixed layer and outcrop line changes are strongly coupled with the northward migration of the North Pacific subtropical gyre and the KE/OE jets as a result of the poleward expanded Hadley cell, indicating that the KE/OE fronts, mode waters, and STFs change as a whole system.

scholarly journals 2P271 Flow cytometry identification of nanocyanobacteria and their limiting factors in the North Pacific Subtropical Gyre(23. Ecology & Environment,Poster)

2013 ◽  
Vol 53 (supplement1-2) ◽  
pp. S203
Author(s):  
Mathias Girault ◽  
Hisayuki Arakawa ◽  
Gerald Gregori ◽  
Fuminori Hashihama ◽  
Hyonchol Kim ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
North Pacific ◽  
Subtropical Gyre ◽  
Limiting Factors ◽  
North Pacific Subtropical Gyre ◽  
The North ◽  
The North Pacific

scholarly journals Microbiome of Trichodesmium Colonies from the North Pacific Subtropical Gyre

2017 ◽  
Vol 8 ◽  
Author(s):  
Mary R. Gradoville ◽  
Byron C. Crump ◽  
Ricardo M. Letelier ◽  
Matthew J. Church ◽  
Angelicque E. White
Keyword(s):  
North Pacific ◽  
Subtropical Gyre ◽  
North Pacific Subtropical Gyre ◽  
The North ◽  
The North Pacific
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