Physical oceanographic conditions around the S1 mooring site

Inoue, Ryuichiro; Kouketsu, Shinya

doi:10.1007/s10872-015-0342-0

Cited by 12 publications

(9 citation statements)

References 38 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The meteorological satellite data showed the propagations of cyclonic eddies in August 2012 (stratification period) and of anticyclonic eddies in December 2012 (mixing period) in the vicinity of Sta. S1 (Inoue and Kouketsu ). However, changes of Chl a and F v / F m due to eddy propagation were unclear in our buoy observations (Fig.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system

Fujiki

Inoue

Honda

et al. 2019

Limnology & Oceanography

Self Cite

View full text Add to dashboard Cite

We conducted time-series observations in the northwestern part of the North Pacific subtropical gyre (30 N, 145 E) from July 2012 to March 2013 using a profiling buoy system equipped with a fast repetition rate fluorometer and dissolved oxygen (DO) sensor in order to understand vertical and temporal variations in gross oxygen production (GOP) by phytoplankton and its contribution to the oxygen cycle in the upper ocean. Under stratified conditions (July-November), daily GOP slightly exceeded 2 mmol O 2 m −3 d −1 and only in near-surface waters. However, during periods of vertical mixing (December-March) when phytoplankton blooms occurred, daily GOP increased in the upper 30 m and often exceeded 5 mmol O 2 m −3 d −1 . The depth-integrated daily GOP within the euphotic layer ( Ð GOP EL ) was relatively low (84.0 AE 23.6 mmol O 2 m −2 d −1 ) during stratification, but increased gradually with vertical mixing and reached 460 mmol O 2 m −2 d −1 on 17 March 2013. Additionally, during stratified conditions, a subsurface oxygen maximum (SOM) formed below the mixed-layer depth (MLD) because the steep density gradient constrained upward diffusion of oxygen produced below the MLD. During the period of vertical mixing, the SOM disappeared, and DO concentrations within the upper 100 m increased through both increasing Ð GOP EL and atmospheric oxygen uptake. Using our buoy observations and air-sea gas flux model, we estimated that 24% AE 7% of Ð GOP EL was emitted to the atmosphere during the stratification period, and Ð GOP EL during the mixing period was about 2.4 times the rate of oxygen uptake by the ocean from the atmosphere. 18 O spike (Bender et al. 1987) incubation methods. These methods rely on the change in oxygen concentrations or the evolution of 18 O 2 from 18 O-H 2 O during water splitting in incubation bottles containing the phytoplankton. However, despite its recognized importance, information on

show abstract

Section: Discussionmentioning

confidence: 99%

“…The satellite data also revealed that two typhoons—MARIA and PRAPIROON—were passing Sta. S1 in mid‐October 2012 (Inoue and Kouketsu ). At that time, there was a transient increase in F v / F m in the water column from deeper waters to the near‐surface layer, indicating a sporadic input of nutrients from deeper waters (Fig.…”

Section: Discussionmentioning

confidence: 99%

Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system

Fujiki

Inoue

Honda

et al. 2019

Limnology & Oceanography

Self Cite

View full text Add to dashboard Cite

show abstract

“…As a test, we computed T I with the western end point fixed at 29 • 9 N, 150 • E. The results were quite similar to those with the end point fixed at 30 • N, 145 • E. Therefore, we concluded that the results described below are independent of the location of the western end point. Hereafter, we present the results on the interior flow of the subtropical gyre with the western end point set at 30 • N, 145 • E. This location corresponds to the southern edge of the recirculation gyre south of the Kuroshio Extension (Inoue and Kouketsu 2016).…”

Section: Segment-wise Agem Methodsmentioning

confidence: 99%

Heat transport variation due to change of North Pacific subtropical gyre interior flow during 1993–2012

et al. 2016

View full text Add to dashboard Cite

Applying segment-wise altimetry-based gravest empirical mode method to expendable bathythermograph temperature, Argo salinity, and altimetric sea surface height data in March, June, and November from San Francisco to near Japan (30 • N, 145 • E) via Honolulu, we estimated the component of the heat transport variation caused by change in the southward interior geostrophic flow of the North Pacific subtropical gyre in the top 700 m layer during 1993-2012. The volume transport-weighted temperature (T I ) is strongly dependent on the season. The anomaly of T I from the mean seasonal variation, whose standard deviation is 0.14 • C, was revealed to be caused mainly by change in the volume transport in a potential density layer of 25.0 − 25.5σ θ . The anomaly of T I was observed to vary on a decadal or shorter, i.e., quasi-decadal (QD), timescale. The QD-scale variation of T I had peaks in 1998 and 2007, equivalent to the reduction in the net heat transport by 6 and 10 TW, respectively, approximately 1 year before those of sea surface temperature (SST) in the warm pool region, east of the Philippines. This suggests that variation in T I affects the warm pool SST through modification of the heat balance owing to the entrainment of southward transported water into the mixed layer.

show abstract

“…Although the BGC‐Argo project intends to develop a global array, only 8% of Argo floats currently have DO sensors (DO‐Argo), and quality control is not yet complete due to complex procedures (Johnson et al, ; Takeshita et al, ; Thierry & Bittig, ). Thus, there is great potential for improved understanding of oceanic carbon chemistry processes when the current challenges are overcome although the use of DO‐Argo data has so far been limited to some pilot studies of eddies, mixed layer depth and ocean circulation, and biological properties for net production (Bushinsky et al, ; Inoue & Kouketsu, ; Riser & Johnson, ; Takeshita et al, ).…”

Section: Introductionmentioning

confidence: 99%

Quasi‐Real‐Time and High‐Resolution Spatiotemporal Distribution of Ocean Anthropogenic CO₂

Watanabe

Hosoda

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

Increasing marine uptake of anthropogenic CO2 (Cant) causes global ocean acidification. To obtain a high‐resolution spatiotemporal distribution of oceanic carbon chemistry, we developed new parameterizations of the seawater total alkalinity, and dissolved inorganic carbon from the ocean's surface to 2,000‐m depth by using dissolved oxygen, water temperature (T), salinity (S), and pressure (P) data. Using the values of total alkalinity and dissolved inorganic carbon predicted by dissolved oxygen, T, S, and P data derived from autonomous biogeochemical Argo floats, we described the distribution of oceanic Cant in the 2000s in the subarctic North Pacific at high spatiotemporal resolution. The Cant was found about 300 m deeper than during the 1990s; its average inventory to 2,000 m was 24.8 ± 10.2 mol/m2, about 20% higher than the 1990s average. Future application of parameterizations to global biogeochemical Argo floats data should allow the detailed global mapping of spatiotemporal distributions of CO2 parameters.

show abstract

Physical oceanographic conditions around the S1 mooring site

Cited by 12 publications

References 38 publications

Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system

Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system

Heat transport variation due to change of North Pacific subtropical gyre interior flow during 1993–2012

Quasi‐Real‐Time and High‐Resolution Spatiotemporal Distribution of Ocean Anthropogenic CO₂

Contact Info

Product

Resources

About

Physical oceanographic conditions around the S1 mooring site

Cited by 12 publications

References 38 publications

Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system

Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system

Heat transport variation due to change of North Pacific subtropical gyre interior flow during 1993–2012

Quasi‐Real‐Time and High‐Resolution Spatiotemporal Distribution of Ocean Anthropogenic CO2

Contact Info

Product

Resources

About

Quasi‐Real‐Time and High‐Resolution Spatiotemporal Distribution of Ocean Anthropogenic CO₂