Long-term changes of dissolved oxygen, hypoxia, and the responses of the ecosystems in the East China Sea from 1975 to 1995

Ning, Xin; Lin, C.; Su, Jilan; Liu, C.; Hao, Qiang; Le, Fengfeng

doi:10.1007/s10872-011-0006-7

Cited by 80 publications

(47 citation statements)

References 17 publications

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“…1, bottom) and interpolated SST onto this grid. The 0.25°×0.25°gridded data were used to calculate area- Tang et al 2009ECS: 28-32 N, 122-128E 1957-1996 Summer In situ SST 0.23 a Ning et al 2011ECS: 32 N, 122-127E 1975-1995 In situ SST 0.34 Ning et al 2011ECS: 32 N, 122-127E 1975-1995 In situ VAT 0.45 Ning et al 2011ECS: 32 N, 122-127E 1975-1995 …”

Section: Methodsmentioning

confidence: 99%

Long-term variability of sea surface temperature in Taiwan Strait

Belkin

Lee

2014

Climatic Change

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Section: Methodsmentioning

confidence: 99%

Long-term variability of sea surface temperature in Taiwan Strait

Belkin

Lee

2014

Climatic Change

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“…A recent study has shown that dissolved oxygen concentrations in the bottom water of the Changjiang plume area in summer have gradually decreased (Ning et al, 2011), suggesting a trend of increasing eutrophication over recent decades. As mentioned earlier, the nutrient export into the ECS is anticipated to be continuously increasing, which may further amplify the PhyCaSS interaction and thereby enhance the suppression of pH and at depth.…”

Section: Biologically Induced Acidification In the Bottommentioning

confidence: 99%

“…Recently, Ning et al (2011) reported that worsening eutrophication has led to a dissolved oxygen (DO) concentration decrease at a rate of 0.72 µmol yr −1 from 1975 to 1995. Assuming that DO concentrations will continue declining at this rate from the present to 2100, the corresponding DIC increase rate can be computed using the Redfield ratio (C : O = 106 : 138; DIC increasing rate = 0.72 × 106 / 138 = 0.55 µmol yr −1 ), while the TA decreasing rate can be estimated by the DO declining rate with a coefficient of −0.119 after Feely et al (2002) (TA decreasing rate = −0.119 × 0.72 = −0.086 µmol yr −1 ).…”

Section: Projection Of Aragonite Saturation States In Bottom Waters Omentioning

confidence: 99%

Carbonate mineral saturation states in the East China Sea: present conditions and future scenarios

et al. 2013

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Abstract.To assess the impact of rising atmospheric CO 2 and eutrophication on the carbonate chemistry of the East China Sea shelf waters, saturation states ( ) for two important biologically relevant carbonate minerals -calcite ( c ) and aragonite ( a ) -were calculated throughout the water column from dissolved inorganic carbon (DIC) and total alkalinity (TA) data collected in spring and summer of 2009. Results show that the highest c (∼ 9.0) and a (∼ 5.8) values were found in surface water of the Changjiang plume area in summer, whereas the lowest values ( c =∼ 2.7 and a =∼ 1.7) were concurrently observed in the bottom water of the same area. This divergent behavior of saturation states in surface and bottom waters was driven by intensive biological production and strong stratification of the water column. The high rate of phytoplankton production, stimulated by the enormous nutrient discharge from the Changjiang, acts to decrease the ratio of DIC to TA, and thereby increases values. In contrast, remineralization of organic matter in the bottom water acts to increase the DIC to TA ratio, and thus decreases values. The projected result shows that continued increases of atmospheric CO 2 under the IS92a emission scenario will decrease values by 40-50% by the end of this century, but both the surface and bottom waters will remain supersaturated with respect to calcite and aragonite. Nevertheless, superimposed on such decrease is the increasing eutrophication, which would mitigate or enhance the decline caused by anthropogenic CO 2 uptake in surface and bottom waters, respectively. Our simulation reveals that, under the combined impact of eutrophication and augmentation of atmospheric CO 2 , the bottom water of the Changjiang plume area will become undersaturated with respect to aragonite ( a =∼ 0.8) by the end of this century, which would threaten the health of the benthic ecosystem.

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“…In the East China Sea, sudden increases in low-oxygen-tolerant foraminifera microfossils since the 1970s suggest that there has been an increase in hypoxic events . Observational data show the spread of hypoxic water gradually extended eastward along the continental shelf at the rate of 3.12 km per year during the period from 1975 to 1995, and phytoplankton, zooplankton, and zoobenthos species decreased significantly (Ning et al 2011). Although hypoxic conditions have occurred previously without anthropogenic nutrient enrichment, the impacted area was probably much smaller than today ).…”

Section: Shift To Eutrophic Statesmentioning

confidence: 97%

Regime shifts and resilience in China’s coastal ecosystems

Zhang

2015

Ambio

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Regime shift often results in large, abrupt, and persistent changes in the provision of ecosystem services and can therefore have significant impacts on human wellbeing. Understanding regime shifts has profound implications for ecosystem recovery and management. China's coastal ecosystems have experienced substantial deterioration within the past decades, at a scale and speed the world has never seen before. Yet, information about this coastal ecosystem change from a dynamics perspective is quite limited. In this review, I synthesize existing information on coastal ecosystem regime shifts in China and discuss their interactions and cascading effects. The accumulation of regime shifts in China's coastal ecosystems suggests that the desired system resilience has been profoundly eroded, increasing the potential of abrupt shifts to undesirable states at a larger scale, especially given multiple escalating pressures. Policy and management strategies need to incorporate resilience approaches in order to cope with future challenges and avoid major losses in China's coastal ecosystem services.

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Long-term changes of dissolved oxygen, hypoxia, and the responses of the ecosystems in the East China Sea from 1975 to 1995

Cited by 80 publications

References 17 publications

Long-term variability of sea surface temperature in Taiwan Strait

Long-term variability of sea surface temperature in Taiwan Strait

Carbonate mineral saturation states in the East China Sea: present conditions and future scenarios

Regime shifts and resilience in China’s coastal ecosystems

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