Water mass analysis of the Coral Sea through an Optimum Multiparameter method

Gasparin, Florent; Maes, Christophe; Sudre, Joël; Garçon, Véronique; Ganachaud, Alexandre

doi:10.1002/2014jc010246

Cited by 28 publications

(32 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, combined with the results of mass balance residuals and Monte Carlo analysis, the typical error solution was considered to be10%. This error level is close to that considered in the water mass analysis of the Coral Sea using an OMP method (Gasparin et al, ).…”

Section: Optimum Multiparameter Methodssupporting

confidence: 83%

“…The full solution of the OMP analysis is then found by minimizing:

{normalR}^{T} normalR = {(|, normalG normalX - normald)}^{T} W^{- 1} true(normalG normalX - normald true)

where G is the SWT definition matrix as shown in Table ; T is the transposed matrix operator; and W −1 is the diagonal weight matrix W (= ω 2 I , where I is the identity matrix). Each equation is weighted by the standard deviation ω of each property as in previous studies (Gasparin et al, ; Maamaatuaiahutapu et al, ). The resulting T, S, and mass conservation equations are assigned a much higher weight than the DIIS.…”

Section: Optimum Multiparameter Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Water Mass Analysis of the East China Sea and Interannual Variation of Kuroshio Subsurface Water Intrusion Through an Optimum Multiparameter Method

et al. 2018

View full text Add to dashboard Cite

The Optimum Multiparameter (OMP) method was used to determine the relative contribution of water masses in the East China Sea (ECS) based on their measured temperature, salinity, and dissolved inorganic iodine species (DIIS, iodate and iodide) from recent oceanographic cruises in June 2014, 2015, and 2016. DIIS (as quasi‐conservative parameters) were added first into the OMP analysis, which enabled us to quantitatively estimate the water composition in the extremely dynamic and productive ECS. The OMP results indicate that seawater in the ECS mainly consisted of Changjiang Diluted Water (CDW), Taiwan Strait Warm Water (TSWW), Kuroshio Surface Water (KSW), and Kuroshio Subsurface Water (KSSW). In June 2014, 2015, and 2016, the KSSW dominated in the deep water, intruded into the ECS shelf from the northeast of Taiwan and bifurcated into a nearshore branch and offshore branch. The nearshore branch could reach north of 29°N off the Zhejiang coast. When comparing the KSSW intrusion in June 2014, 2015, and 2016, the average KSSW contribution of the bottom KSSW area in June 2016 (78.9%) was greater than in the previous 2 years (67.9% and 64.5%). In the northern transects (north of 28°N), the KSSW intrusion in June 2016 also contained the greatest average KSSW contribution and the maximum coverage area. Thus, the KSSW intrusion was strongest in June 2016 and may be comparable in June 2014 and 2015. This interannual variability of the KSSW intrusion is likely related to the El Niño‐Southern Oscillation (ENSO) rather than the Pacific Decadal Oscillation (PDO).

show abstract

Section: Optimum Multiparameter Methodssupporting

confidence: 83%

“…The full solution of the OMP analysis is then found by minimizing:

{normalR}^{T} normalR = {(|, normalG normalX - normald)}^{T} W^{- 1} true(normalG normalX - normald true)

Section: Optimum Multiparameter Methodsmentioning

confidence: 99%

Water Mass Analysis of the East China Sea and Interannual Variation of Kuroshio Subsurface Water Intrusion Through an Optimum Multiparameter Method

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In the WEP, SPTW can further be divided into two branches, one branch reaching the Solomon Sea via the NVJ (Germineaud et al, ; Grenier et al, ), and a second branch entering the Solomon Sea via the GBRUC (Gasparin et al, ). WSPCW forms seasonally through winter‐convection in the subtropical convergence zone between Tasmania and New Zealand (Grenier et al, ; Roemmich & Cornuelle, ; Qu et al, ) and reaches the southern study site via the NCJ and GBRUC (Gasparin et al, ). Below the thermocline, SAMW‐density water (26.8–27.1σ θ ) is discernible as a pycnostad with relatively high oxygen concentrations and a characteristically low silicate‐to‐nitrate ratio (Si* minimum; Sarmiento et al, ).…”

Section: Study Areamentioning

confidence: 99%

Isotopic Evidence for the Evolution of Subsurface Nitrate in the Western Equatorial Pacific

et al. 2018

View full text Add to dashboard Cite

Subsurface waters from both hemispheres converge in the Western Equatorial Pacific (WEP), some of which form the Equatorial Undercurrent (EUC) that influences equatorial Pacific productivity across the basin. Measurements of nitrogen (N) and oxygen (O) isotope ratios in nitrate (δ15NNO3 and δ18ONO3), the isotope ratios of dissolved inorganic carbon (δ13CDIC), and complementary biogeochemical tracers reveal that northern and southern WEP waters have distinct biogeochemical histories. Organic matter remineralization plays an important role in setting the nutrient characteristics on both sides of the WEP. However, remineralization in the northern WEP contributes a larger concentration of the nutrients, consistent with the older “age” of northern thermocline‐depth and intermediate‐depth waters. Remineralization introduces a relatively low δ15NNO3 to northern waters, suggesting the production of sinking organic matter by N2 fixation at the surface—consistent with the notion that N2 fixation is quantitatively important in the North Pacific. In contrast, remineralization contributes elevated δ15NNO3 to the southern WEP thermocline, which we hypothesize to derive from the vertical flux of high‐δ15N material at the southern edge of the equatorial upwelling. This signal potentially masks any imprint of N2 fixation from South Pacific waters. The observations further suggest that the intrusion of high δ15NNO3 and δ18ONO3 waters from the eastern margins is more prominent in the northern than southern WEP. Together, these north‐south differences enable the examination of the hemispheric inputs to the EUC, which appear to derive predominantly from southern hemisphere waters.

show abstract

“…The eastward surface current flowing south of NC is called the SubTropical CounterCurrent (STCC); Ridgway and Dunn (2003) showed that this surface current is not continuous but occurs as a series of branches that emanate from the East Australian Current recirculation and flow toward or south of the main land of NC (see their Salinity is a useful parameter to trace water masses, and is used as a complementary tool to follow current pathways. The water masses' properties entering the Coral Sea have been described in detail (see for example Tomczak and Hao, 1989;Lindstrom, 2002, 2004;Qu et al, 2009;Grenier et al, 2013Grenier et al, , 2014Kessler and Cravatte, 2013a;Ganachaud et al, 2014;Gasparin et al, 2014), and for the purpose of this study, only a few points of their findings need to be reminded. Two distinct thermocline water masses originating from different subduction zones enter the Coral Sea at different densities.…”

Section: Background: Large-scale Circulation and Water Masses In The mentioning

confidence: 99%

Regional circulation around New Caledonia from two decades of observations

Cravatte¹,

Kestenare²,

Eldin³

et al. 2015

Journal of Marine Systems

Self Cite

View full text Add to dashboard Cite

Water mass analysis of the Coral Sea through an Optimum Multiparameter method

Cited by 28 publications

References 44 publications

Water Mass Analysis of the East China Sea and Interannual Variation of Kuroshio Subsurface Water Intrusion Through an Optimum Multiparameter Method

Water Mass Analysis of the East China Sea and Interannual Variation of Kuroshio Subsurface Water Intrusion Through an Optimum Multiparameter Method

Isotopic Evidence for the Evolution of Subsurface Nitrate in the Western Equatorial Pacific

Regional circulation around New Caledonia from two decades of observations

Contact Info

Product

Resources

About