Effects of typhoon events on chlorophyll and carbon fixation in different regions of the East China Sea

Chen, Dongxing; He, Lei; Liu, Fenfen; Yin, Kedong

doi:10.1016/j.ecss.2017.06.026

Cited by 32 publications

(25 citation statements)

References 67 publications

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“…The study region is located at 32 • S, close to the critical latitude (30 • S), where the inertial period is 24 h. Because the diurnal sea breeze system also has a ∼ 24 h period, resonance occurs, which generates near-inertial waves (Mihanović et al, 2016;Chen, 2017). Field measurements revealed that near-inertial waves force the thermocline to oscillate at a diurnal timescale with a vertical excursion > 50 m (Mihanović et al, 2016;Chen, 2017). This vertical excursion of the thermocline causes the thermocline to migrate along the continental slope on a diurnal timescale.…”

Section: Discussionmentioning

confidence: 99%

“…A strong Leeuwin Current, which transported warmer low-salinity low-nutrient water from the north to the south, affected the inter-annual variability in the temperature and salinity and most likely the chlorophyll concentration. A small decrease in the number of winter storms between 2011 and 2014 (Wandres et al, 2017) might also have reduced local recycling of nutrients (Chen et al, 2017).…”

Section: Inter-annual Variabilitymentioning

confidence: 99%

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Seasonal and inter-annual variability of water column properties along the Rottnest continental shelf, south-west Australia

et al. 2019

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A multi-year ocean glider dataset, obtained along a representative cross-shelf transect along the Rottnest continental shelf, south-west Australia, was used to characterise the seasonal and inter-annual variability of water column properties (temperature, salinity, and chlorophyll fluorescence distribution). All three variables showed distinct seasonal and inter-annual variations that were related to local and basin-scale ocean atmosphere processes. Controlling influences for the variability were attributed to forcing from two spatial scales: (1) the local scale (due to Leeuwin Current and dense shelf water cascades, DSWC) and (2) the basin scale (El Niño-Southern Oscillation, ENSO, events). In spring and summer, inner-shelf waters were well mixed due to strong wind mixing, and deeper waters ( > 50 m) were vertically stratified in temperature that contributed to the presence of a subsurface chlorophyll maximum (SCM). On the inner shelf, chlorophyll fluorescence concentrations were highest in autumn and winter. DSWCs were also the main physical feature during autumn and winter. Chlorophyll fluorescence concentration was higher closer to the seabed than at the surface in spring, summer, and autumn. The seasonal patterns coincided with changes in the wind field (weaker winds in autumn) and air-sea fluxes (winter cooling and summer evaporation). Inter-annual variation was associated with ENSO events. Lower temperatures, higher salinity, and higher chlorophyll fluorescence (> 1 mg m −3 ) were associated with the El Niño event in 2010. During the strong La Niña event in 2011, temperatures increased and salinity and chlorophyll fluorescence decreased (< 1 mg m −3 ). It is concluded that the observed seasonal and inter-annual variabilities in chlorophyll fluorescence concentrations were related to the changes in physical forcing (wind forcing, Leeuwin Current, and air-sea heat and moisture fluxes).

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Section: Discussionmentioning

confidence: 99%

Section: Inter-annual Variabilitymentioning

confidence: 99%

Seasonal and inter-annual variability of water column properties along the Rottnest continental shelf, south-west Australia

et al. 2019

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“…On the continental slope, seaward of the shelf break (an area of 20-30 km), the chlorophyll concentration anomalies were more diffuse, most likely because of the variation in the upwelling and the diurnal cycle (Chen et al, 2017). In autumn and winter, the SCM was absent, but the chlorophyll concentration anomalies were Ocean Sci.…”

Section: Chlorophyll Concentration Anomalymentioning

confidence: 99%

“…A strong Leeuwin current, which transported warmer, low salinity, low nutrient water from the north 5 to the south, affected the interannual variability in the temperature and salinity and most likely the chlorophyll concentration. A small decrease in the number of winter storms between 2011and 2014(Wandres et al, 2017 might also have reduced local recycling of nutrients (Chen et al, 2017).…”

Section: Interannual Variabilitymentioning

confidence: 99%

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Seasonal and interannual variability of water column properties along the Rottnest continental shelf, south-west Australia

Chen¹,

Pattiaratchi²,

Ghadouani³

et al. 2018

Preprint

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Abstract. A multiyear, ocean glider dataset, obtained along a representative cross-shelf transect along the Rottnest continental shelf, south-west Australia, was used to characterise the seasonal and inter-annual variability of water column properties (temperature, salinity, and chlorophyll fluorescence distribution). All three variables showed distinct seasonal and inter-annual variations. Local and basin-scale ocean–atmosphere processes also affected the spatial distributions of the water column properties. The controlling influences for the variability were derived from (a) at the local scale, the Leeuwin Current and dense shelf water cascades (DSWC); and, (2) at the basin scale, the El Niño Southern Oscillation (ENSO). In spring and summer, shallow waters were well mixed due to strong wind mixing and the deeper waters (> 50 m) were vertically stratified in temperature that contributed to the formation of a subsurface chlorophyll maximum (SCM). With the onset of storms in late autumn, the water column was well mixed with the SCM absent. On the inner shelf, chlorophyll fluorescence concentrations were highest in autumn and winter; DSWCs were also the main physical feature during autumn and winter. Chlorophyll fluorescence concentration was higher closer to the sea bed than at the surface in spring, summer, and autumn. The seasonal patterns coincided with changes in the wind field (weaker winds in autumn) and air–sea fluxes (winter cooling and summer evaporation). Inter-annual variation was associated with ENSO events. Lower temperatures, higher salinity, and higher chlorophyll fluorescence (> 1 mg m−3) were associated with the El Niño event in 2010. During the strong La Niña event in 2011, temperatures increased (a marine heat wave), and salinity and chlorophyll fluorescence decreased (

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High‐frequency time‐series autonomous observations of sea surface pCO₂ and pH

Dai

Guo

et al. 2020

Limnology & Oceanography

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Carbon dioxide partial pressure (pCO 2) in surface water was continuously measured every 3 h from July 2012 to June 2013 using an autonomous pCO 2 system (MAPCO 2) deployed on a moored buoy on the East China Sea shelf (31 N, 124.5 E). Sea surface pCO 2 and pH had the largest variations in summer, ranging from 215 to 470 μatm, and 7.941 to 8.263 (averagely 8.084 ± 0.080), respectively. They varied little in winter, ranging from 328 to 395 μatm, and 8.003 to 8.074 (averagely 8.052 ± 0.010), respectively. The seasonal average sea surface pCO 2 was respectively 335 ± 70 μatm, 422 ± 43 μatm, 362 ± 11 μatm, and 311 ± 59 μatm in summer, autumn, winter, and spring, and was overall undersaturated with respect to atmosphere on a yearly basis. Although the average sea surface pCO 2 in summer was below the atmospheric level, the net CO 2 flux has suggested a CO 2 source status due to the influence of typhoon. Our observation thus demonstrated the significant, even dominant impact of episodic typhoon events on surface ocean CO 2 chemistry and air-sea CO 2 gas exchange, which would be impossible to capture by shipboard observation. The high wind stress and curl associated with the northward movement of typhoon induced complex sea surface water movement, vertical mixing, and subsequent biological drawdown, which differed in pre-, onset, and post-typhoon stages. Based on our estimates, the degassing fluxes during typhoon reached as high as 82 mmol m −2 CO 2 and 242 mmol m −2 CO 2 in summer and autumn, respectively, accounting for twice as large as the summer CO 2 sink during non-typhoon period, and 28% of the total CO 2 source in autumn.

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Effects of typhoon events on chlorophyll and carbon fixation in different regions of the East China Sea

Cited by 32 publications

References 67 publications

Seasonal and inter-annual variability of water column properties along the Rottnest continental shelf, south-west Australia

Seasonal and inter-annual variability of water column properties along the Rottnest continental shelf, south-west Australia

Seasonal and interannual variability of water column properties along the Rottnest continental shelf, south-west Australia

High‐frequency time‐series autonomous observations of sea surface pCO₂ and pH

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Effects of typhoon events on chlorophyll and carbon fixation in different regions of the East China Sea

Cited by 32 publications

References 67 publications

Seasonal and inter-annual variability of water column properties along the Rottnest continental shelf, south-west Australia

Seasonal and inter-annual variability of water column properties along the Rottnest continental shelf, south-west Australia

Seasonal and interannual variability of water column properties along the Rottnest continental shelf, south-west Australia

High‐frequency time‐series autonomous observations of sea surface pCO2 and pH

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Product

Resources

About

High‐frequency time‐series autonomous observations of sea surface pCO₂ and pH