Intraseasonal variability of the subsurface temperature ob-served in the South China Sea (SCS)

Fa-xiu, Zhou; Gao, Rongzhen

doi:10.1360/02tb9081

Cited by 11 publications

(5 citation statements)

References 15 publications

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“…Prominent temperature variation in the SCS is restricted to the mixed layer [ Zhou and Gao , ], where salinity is also quite variable due to basin‐wide precipitation, river runoff from the surrounding landmasses, and advection of deeper water masses [ Wang and Li , ; Wang and Wang , ]. During the weaker and wetter southwest monsoon (May to September), surface water temperatures of the warm pool peak at >29°C.…”

Section: Upper Ocean Temperatures In the South China Seamentioning

confidence: 99%

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Global dissolution effects on planktonic foraminiferal Mg/Ca ratios controlled by the calcite-saturation state of bottom waters

et al. 2014

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Mg/Ca ratios of planktonic foraminiferal tests are important tools for reconstructing past ocean temperatures at different levels of the upper water column. Yet numerous studies suggest a significant influence of calcite dissolution on Mg/Ca ratios lowering their initial signal recorded within a planktonic foraminiferal habitat. To determine the effect of dissolution, this study presents Mg/Ca ratios of eight planktonic foraminiferal species from the South China Sea sediment surface. Continuously decreasing with increasing water depth, the Mg/Ca ratios also decrease with calcite-saturation states close to and below saturation (bottom water Δ[CO 2− 3 ] <30 μmol kg −1 ) but are stable in well calcite-supersaturated bottom waters (>40 μmol kg −1 ). This preservation pattern compares well with examples of Mg/Ca dissolution from the tropical Atlantic Ocean and is independent of the foraminiferal species. Merging a global data set by separate normalization of 79 Mg/Ca data sets from the Pacific, Atlantic, and Indian Oceans, which removes thermal differences between the ocean regions and foraminiferal species, enabled us to quantify a global decrease in planktonic foraminiferal Mg/Ca ratios of 0.054 ±0.019 μmol mol −1 per μmol kg −1 below a critical threshold for dissolution of 21.3 ±6.6 μmol kg −1 . The absolute decline in Mg/Ca ratios, which is similar for all species, affects temperature estimates from (sub-)thermocline species more strongly than those from shallow dwellers. The water depth of this critical threshold in the global oceans shoals from >3.5 km in the North Atlantic to <0.5 km in the North Pacific based on calculations of the global calcite-saturation state from 6321 hydrographic stations. Above this critical threshold Mg/Ca ratios are well preserved, and paleotemperature estimates are broadly unaffected by dissolution.

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Section: Upper Ocean Temperatures In the South China Seamentioning

confidence: 99%

“…Prominent temperature variation in the SCS is restricted to the mixed layer [Zhou and Gao, 2003], where salinity is also quite variable due to basin-wide precipitation, river runoff from the surrounding landmasses, REGENBERG ET AL.…”

Section: Upper Ocean Temperatures In the South China Seamentioning

confidence: 99%

Global dissolution effects on planktonic foraminiferal Mg/Ca ratios controlled by the calcite-saturation state of bottom waters

et al. 2014

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“…Shannon-Weiner index and Pielou index were high in summer and low in spring while Margalef index was high in summer and low in winter. According to the standards of Kuang Qijun [12], Zhou Guangjie [14] and Shu Jianmin [15], etc., the water quality of Shilianghe reservoir was determined as α-medium pollution type. Compared to Nvshahu lake [16], Honghu lake [17] and Jiantan reservoir [18], the Shannon-Wiener index, Margalef index and Pielou index of Shilianghe reservoir were all relatively lower.…”

Section: Discussmentioning

confidence: 99%

Seasonal Dynamics of Algal Biodiversity and Water Quality Assessment of Jiangsu Shilianghe Reservoir in China

Gao

2013

AMR

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Analysis of 4 sampling surveys on Jiangsu Shilianghe reservoir in May, July and October of 2011 and January of 2012, 109 species of algae belonging to 7 divisions were totally identified. The green algae and diatoms were the main species while Euglena and Cryptomonas were rare. The algal cell density in each season was compared as follows: summer (63.77 × 1000000 / L) > autumn (61.87 ×1000000 / L) > spring (43.31 ×1000000 / L) > winter (37.922 ×1000000 / L). Algae Shannon-Wiener index and Pielou indexes of each season were compared and described as follows: summer (2.71, 0.41) > winter (2.09, 0.32) > autumn (2.05, 0.31) > spring (1.85, 0.28). The Margalef indexes of each season were compared as follows: summer (1.51) > spring (1.38) > autumn (1.19) > winter (0.86). The water quality was assessed as α-medium pollution according to biological indicators. Sand mining, cages and obstruction between rivers and lakes may be the main reasons that lead to high algal cell density and low index of species diversity.

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“…The SCS is controlled by the Southeast Asia monsoon system, and the basin-scale circulation in the upper ocean is regulated by the monsoon [Wyrtki, 1961]. Sea surface temperature (SST) and subsurface temperature in the SCS have intra-seasonal variations [Zhou and Gao, 2002], with amplitudes from 0.3°C to 0.5°C [Kawamura et al, 1988; Krishnamurti et al, 1988; Zhou et al, 1995]. The atmosphere has a memory shorter than the ocean.…”

Section: Introductionmentioning

confidence: 99%

Free and Forced Rossby Waves in the Western South China Sea Inferred from Jason-1 Satellite Altimetry Data

Xie

et al. 2008

Sensors

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Data from a subsurface mooring deployed in the western South China Sea shows clear intra-seasonal oscillations (ISO) at the period of 40~70 days. Analysis of remotelysensed sea surface height (SSH) anomalies in the same area indicates that these ISO signals propagate both eastward and westward. Time-longitude diagrams of ISO signals in SSH anomalies and wind-stress curl indicate that the eastward propagating SSH anomalies is forced by wind-stress curl. This is also confirmed by lag correlation between SSH anomalies and the wind-stress-curl index (wind stress curl averaged over 109.5ºE -115ºE and 12ºN -13.5ºN). Lag correlation of SSH anomaly suggests that the westward propagating signals are free Rossby waves.

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Intraseasonal variability of the subsurface temperature ob-served in the South China Sea (SCS)

Cited by 11 publications

References 15 publications

Global dissolution effects on planktonic foraminiferal Mg/Ca ratios controlled by the calcite-saturation state of bottom waters

Global dissolution effects on planktonic foraminiferal Mg/Ca ratios controlled by the calcite-saturation state of bottom waters

Seasonal Dynamics of Algal Biodiversity and Water Quality Assessment of Jiangsu Shilianghe Reservoir in China

Free and Forced Rossby Waves in the Western South China Sea Inferred from Jason-1 Satellite Altimetry Data

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