Dynamic mechanism of interannual sea surface height variability in the North Pacific Subtropical Gyre

2010 ◽  
Vol 28 (1) ◽  
pp. 158-168 ◽  
Author(s):  
Yong-Chui Zhang ◽  
Li-Feng Zhang ◽  
Qing-Ping Lü
Keyword(s):  
North Pacific ◽  
Sea Surface Height ◽  
Dynamic Mechanism ◽  
Subtropical Gyre ◽  
Sea Surface ◽  
North Pacific Subtropical Gyre ◽  
The North ◽  
The North Pacific

The ecological and biogeochemical state of the North Pacific Subtropical Gyre is linked to sea surface height

2019 ◽  
Vol 77 (2) ◽  
pp. 215-245 ◽  
Author(s):  
Benedetto Barone ◽  
Ashley R. Coenen ◽  
Stephen J. Beckett ◽  
Dennis J. McGillicuddy ◽  
Joshua S. Weitz ◽  
...  
Keyword(s):  
North Pacific ◽  
Sea Surface Height ◽  
Subtropical Gyre ◽  
Sea Surface ◽  
Inorganic Nutrients ◽  
North Pacific Subtropical Gyre ◽  
Chlorophyll Maximum ◽  
The North ◽  
Eukaryotic Phytoplankton ◽  
The North Pacific

Sea surface height (SSH) is routinely measured from satellites and used to infer ocean currents, including eddies, that affect the distribution of organisms and substances in the ocean. SSH not only reflects the dynamics of the surface layer, but also is sensitive to the fluctuations of the main pycnocline; thus it is linked to events of nutrient upwelling. Beyond episodic upwelling events, it is not clear if and how SSH is linked to broader changes in the biogeochemical state of marine ecosystems. Our analysis of 23 years of satellite observations and biogeochemical measurements from the North Pacific Subtropical Gyre shows that SSH is associated with numerous biogeochemical changes in distinct layers of the water column. From the sea surface to the depth of the chlorophyll maximum, dissolved phosphorus and nitrogen enigmatically increase with SSH, enhancing the abundance of heterotrophic picoplankton. At the deep chlorophyll maximum, increases in SSH are associated with decreases in vertical gradients of inorganic nutrients, decreases in the abundance of eukaryotic phytoplankton, and increases in the abundance of prokaryotic phytoplankton. In waters below ∼100 m depth, increases in SSH are associated with increases in organic matter and decreases in inorganic nutrients, consistent with predicted consequences of the vertical displacement of isopycnal layers. Our analysis highlights how satellite measurements of SSH can be used to infer the ecological and biogeochemical state of open-ocean ecosystems.

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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