Modelling the effect of atmospheric nitrogen deposition on marine phytoplankton in the Singapore Strait

Sundarambal, P.; Tkalich, Pavel; Balasubramanian, Rajasekhar

doi:10.2166/wst.2010.357

Cited by 9 publications

(6 citation statements)

References 17 publications

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“…For the present study, NEUTRO was enhanced in its capability to address the atmospheric input of macronutrients as a distributed source. The enhanced model (Sundarambal et al, 2006) was subsequently utilized to investigate the fate of atmospherically deposited nutrients in the water column, and its impact on water quality and aquatic ecosystems in Singapore and surrounding regions (Sundarambal et al, 2010a). The present model can simulate the fate of transport of nutrients from point sources (outfalls, spills) (Sundarambal and Tkalich, 2005) and non-point sources (runoff, AD) (Sundarambal et al, 2006).…”

Section: Three Dimensional Numerical Eutrophication Model (Neutro)mentioning

confidence: 99%

“…Occurrences of large episodic events of atmospheric nitrogen inputs can strongly impact the surface ocean biogeochemistry (Paerl, 1985). Episodic wet deposition event with nitrate-nitrogen concentration of 34.6 mg/l occurred during October/November 2006 onto water surface and the absolute change of surface water nitrate-nitrogen concentration of maximum 1 mg/l from baseline (0.02 mg/l) was computed due to the assumed episodic wet deposition event (Sundarambal et al, 2010a). The absolute difference (increase) of surface water PO 3− 4 and OP concentrations from baseline due to the atmospheric wet deposition during hazy and non-hazy days is shown in Fig.…”

Section: Significance Of Atmospheric Deposition During Smoke Haze Evementioning

confidence: 99%

“…The model provides a convenient tool for testing hypotheses about the processes, otherwise not fully understood from direct measurements. In order to examine the quantitative response of the pelagic plankton to atmospheric N and P deposition events and possible links between them, a numerical modeling study can be used (Sundarambal et al, 2006(Sundarambal et al, , 2010a. The motivation for applying this numerical modeling approach is to explore and quantify water quality variability due to the transfer of atmospherically-derived nutrients onto coastal water and to predict the resultant nutrient and phytoplankton dynamics in this region.…”

Section: Introductionmentioning

confidence: 99%

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Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

2010

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Abstract. Atmospheric deposition of nutrients (N and P species) can intensify anthropogenic eutrophication of coastal waters. It was found that the atmospheric wet and dry depositions of nutrients was remarkable in the Southeast Asian region during the course of smoke haze events, as discussed in a companion paper on field observations (Sundarambal et al., 2010b). The importance of atmospheric deposition of nutrients in terms of their biological responses in the coastal waters of the Singapore region was investigated during hazy days in relation to non-hazy days. The influence of atmospherically-derived, bio-available nutrients (both inorganic and organic nitrogen and phosphorus species) on the coastal water quality between hazy and non-hazy days was studied. A numerical modeling approach was employed to provide qualitative and quantitative understanding of the relative importance of atmospheric and ocean nutrient fluxes in this region. A 3-D eutrophication model, NEUTRO, was used with enhanced features to simulate the spatial distribution and temporal variations of nutrients, plankton and dissolved oxygen due to atmospheric nutrient loadings. The percentage increase of the concentration of coastal water nutrients relative to the baseline due to atmospheric deposition was estimated between hazy and non-hazy days. Model computations showed that atmospheric deposition fluxes of nutrients might account for up to 17 to 88% and 4 to 24% of total mass of nitrite + nitrate-nitrogen in the water column, during hazy days and non-hazy days, respectively. The results obtained from the modeling study could be used for a Correspondence to: R. Balasubramanian (eserbala@nus.edu) better understanding of the energy flow in the coastal zone system, exploring various possible scenarios concerning the atmospheric deposition of nutrients onto the coastal zone and studying their impacts on water quality.

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Section: Three Dimensional Numerical Eutrophication Model (Neutro)mentioning

confidence: 99%

Section: Significance Of Atmospheric Deposition During Smoke Haze Evementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

2010

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“…Assessments based on modelling and remote sensing data indicate that the aerosol loading has a close connection with increased biological production and coastal eutrophication Onitsuka et al, 2009;Sundarambal et al, 2010). Paytan et al (2009) used a model to predict the aerosol toxicity on phytoplankton in the SCS based on theoretical deposition fluxes and toxicity thresholds of phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of phytoplankton community structure in the South China Sea in response to the East Asian aerosol input

Guo

Wang

et al. 2012

Biogeosciences

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Abstract. Recent studies have demonstrated atmospheric deposition as an important source of bioreactive compounds to the ocean. The South China Sea (SCS), where aerosol loading is among the highest in the world, however, is poorly studied, particularly on the in situ response of phytoplankton community structures to atmospheric deposition. By conducting a series of microcosm bioassays at different hydrographical locations and simulating different aerosol event scales, we observed both positive and negative responses to the input of East Asian (EA) aerosol with high nitrogen (N) and trace metal contents, in terms of biomass, composition and physiological characteristics of phytoplankton communities. High levels of aerosol loading relieved phytoplankton nitrogen and trace metal limitations in SCS, and thus increased total phytoplankton biomass, enhanced their physiological indicators (e.g. photosynthetic efficiency) and shifted phytoplankton assemblages from being dominated by picoplankton to microphytoplanton, especially diatoms. However, under low levels of aerosol loading, the composition shift and biomass accumulation were not apparent, suggesting that the stimulation effects might be counterbalanced by enhanced grazing mortality indicated by increased abundance of protist grazers. Trace metal toxicity of the aerosols might also be the reason for the reduction of picocyanobacteria when amended with high EA aerosols. The magnitude and duration of the deposition event, as well as the hydrographical and trophic conditions of receiving waters are also important factors when predicting the influence of an aerosol deposition event. Our results demonstrated different responses of phytoplankton and microbial food web dynamics to different scales of atmospheric input events in SCS and highlighted the need for achieving an accurate comprehension of atmospheric nutrient on the biogeochemical cycles of the oceans.

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“…The effects of atmospheric aerosol loading on phytoplankton community structures and biogeochemistry have been suggested to be significant in this region during previous studies (Wong et al, 2002;Wu et al, 2003;Lin et al, 2007). Assessments based on modelling and remote sensing data indicate that the aerosol loading has a close connection with increased biological production and coastal eutrophication Onitsuka et al, 2009;Sundarambal et al, 2010). Paytan et al (2009) used a model to predict the aerosol toxicity on phytoplankton in the SCS based on theoretical deposition fluxes and toxicity thresholds of phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of phytoplankton community structure in the South China Sea in response to the East Asian aerosol input

Guo¹,

Yu²,

Ho³

et al. 2011

Preprint

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Recent studies have regarded atmospheric deposition as an increasingly important source of nutrients to the ocean. The South China Sea (SCS), where aerosol loading is among the highest in the world, however, is poorly studied particularly on the in situ changes of phytoplankton community structures in response to atmospheric deposition. By conducting a series of microcosm bioassays at different hydrographical locations and simulating different aerosol event scales, we observed both positive and negative responses induced by the input of East Asia (EA) aerosol with high nitrogen (N) and trace metal contents, in terms of both community structure and physiological characteristics of phytoplankton. High levels of aerosol loading profoundly relieved phytoplankton nitrogen and trace metal limitations in SCS, and thus increased total phytoplankton biomass, enhanced their physiological indicators (e.g. photosynthetic efficiency) and shifted phytoplankton assemblages from being dominated by picoplankton to microphytoplanton, especially diatoms. However, under low levels of aerosol loading, the composition shift and biomass accumulation were not apparent, suggesting that the stimulation effects might be counterbalanced by enhanced grazing mortality indicated by increased abundance of protist grazers. Trace metal toxicity of the aerosols was also an important negative factor to phytoplankton growth, especially picocyanobacteria, implicated by the high copper (Cu) concentration in the microcosm that surpassed the toxicity threshold of marine cyanobacteria. Moreover, the magnitude and duration of the deposition event, as well as the hydrographical and trophic conditions of receiving waters are also important factors when predicting the influence of an aerosol deposition event. Our results demonstrated that the EA aerosol deposition events could profoundly change nutrient and phytoplankton dynamics in SCS and highlighted the need for achieving an accurate comprehension of atmospheric nutrient on the biogeochemical cycles of the oceans

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Modelling the effect of atmospheric nitrogen deposition on marine phytoplankton in the Singapore Strait

Cited by 9 publications

References 17 publications

Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

Impact of biomass burning on ocean water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

Dynamics of phytoplankton community structure in the South China Sea in response to the East Asian aerosol input

Dynamics of phytoplankton community structure in the South China Sea in response to the East Asian aerosol input

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