Mesoscale eddy effects on temporal variability of surface chlorophyll a in the Kuroshio Extension

Kouketsu, Shinya; Kaneko, Hitoshi; Okunishi, Takeshi; Sasaoka, Kosei; Itoh, Susumu; Inoue, Ryuichiro; Ueno, Hiromichi

doi:10.1007/s10872-015-0286-4

Cited by 53 publications

(45 citation statements)

References 29 publications

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“…The observational data obtained at S1 over 9 years revealed the typical subtropical features of an oligotrophic, low-chlorophyll environment (Table 2), although the effects of mesoscale eddies on the ecosystem at S1 were occasionally observed (Kouketsu et al 2015). The observed and simulated surface NO 3 − concentrations at S1 were less than 1.0 μmol L −1 throughout the year (Fig.…”

Section: Light Intensity (D) Light Intensity (C)mentioning

confidence: 84%

Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model

et al. 2015

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emissions were estimated to be 32.3 mg N m −2 year −1 at K2 and 2.7 mg N m −2 year −1 at S1. The results of case studies based on this model estimated the ratios of in situ biological N 2 O production to nitrate production during nitrification to be ~0.22 % at K2 and ~0.06 % at S1. It is also suggested that N 2 O was mainly produced via ammonium oxidation at K2, but was produced via both ammonium oxidation and nitrite reduction at S1. A large fraction (~80 %) of the ammonium oxidation at K2 was carried out by archaea in the subsurface water. Isotope tracer incubation experiments using an archaeal activity inhibitor supported this hypothesis.

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Section: Light Intensity (D) Light Intensity (C)mentioning

confidence: 84%

Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model

et al. 2015

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“…In surface chlorophyll a (Fig. 10b), there was a variability possibly associated with a decadal-scale change (e.g., Lin et al 2014;Kouketsu et al 2015). The chlorophyll a anomaly tended to be negative (positive) when the KE was stable (unstable) in 2002-2005 (2006-2009).…”

Section: Discussionmentioning

confidence: 99%

“…Since it was suggested that the numbers of eddies and typhoons passing by the S1 mooring site and surface forcing could have interannual and decadal modulations (e.g., Sect. 3; Kouketsu et al 2015), and there was a time lag between variability of chlorophyll a anomaly and that of the local SSHA (Fig. 10a, b), understanding interactions between those processes and the relative importance of those processes on biogeochemical properties around the S1 mooring site deserve future studies.…”

Section: Discussionmentioning

confidence: 99%

Physical oceanographic conditions around the S1 mooring site

Inoue

Kouketsu

2015

J Oceanogr

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“…Itoh and Yasuda [] based on the SSHA data, discussed the characteristics of mesoscale eddies in the Kuroshio‐Oyashio extension region. There are also other eddy‐related studies in this region [such as : Kitano , ; Ebuchi and Hanawa , ; Delman et al ., ; Kouketsu et al ., ]. This zonal band is our focus in this paper where a number of Argo vertical profile data are available.…”

Section: Introductionmentioning

confidence: 99%

Vertical structure anomalies of oceanic eddies in the Kuroshio Extension region

Sun

Dong

Wang

et al. 2017

J. Geophys. Res. Oceans

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Using collocated altimetry sea surface height anomalies (SSHA) and Argo profiles within detected eddies, we investigated structures of temperature, salinity, potential density, geostrophic current, mixed layer depth (MLD), potential vorticity (PV), and buoyancy frequency (N) in the Kuroshio Extension (KE) region under the influences of oceanic eddies. We identified 54,302 oceanic eddies (snapshots) in the KE region during the period of 1999–2013. The composite analysis showed that changes in physical parameters modulated by the climatological composite eddies (hereinafter referred to as composite eddies) were mainly confined in the upper 800 m. At the eddy core, the maximum cooling in the composite cyclonic eddy (CE) reaches 2.00°C at ∼360 m, with maximum salinity change of −0.13 psu at ∼260 m and maximum potential density change of +0.27 kg/m3 at ∼310 m. In contrast, the maximum warming in the composite anticyclonic eddy (AE) reaches 1.78°C at ∼410 m of the eddy core, with maximum salinity change of 0.12 psu at ∼260 m and maximum potential density change of −0.22 kg/m3 at ∼410 m. There were obvious anticlockwise and clockwise geostrophic current anomalies associated with the composite CE and AE, respectively. The seasonal mean eddy‐modulated MLD anomaly had significant seasonal variations. In addition, they could modulate opposite PV changes, the magnitude of which varied with depth.

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Mesoscale eddy effects on temporal variability of surface chlorophyll a in the Kuroshio Extension

Cited by 53 publications

References 29 publications

Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model

Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model

Physical oceanographic conditions around the S1 mooring site

Vertical structure anomalies of oceanic eddies in the Kuroshio Extension region

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