Short-term and seasonal variation in metabolic balance in Liverpool Bay

Panton, Anouska; Mahaffey, Claire; Greenwood, Naomi; Hopkins, Joanne; Montagnes, David J. S.; Sharples, Jonathan

doi:10.1007/s10236-011-0494-4

Cited by 3 publications

(2 citation statements)

References 43 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, for 2009, net community production, (i.e. the amount of carbon available for export from the euphotic zone; NPP minus heterotrophic respiration) at the site was estimated to be between 30.8 and 50.4 g C m −2 year −1 (Panton et al 2011) indicating that the site was net autotrophic. Additional supply of carbon to the site would therefore be required to support the copepod community, such as through advection offshore of the coastal waters which are high in algal biomass (Fig.…”

Section: Controls On Phytoplankton Bloom Dynamicsmentioning

confidence: 99%

Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay

et al. 2011

Self Cite

View full text Add to dashboard Cite

The seasonal and interannual variability in the phytoplankton community in Liverpool Bay between 2003 and 2009 has been examined using results from high frequency, in situ measurements combined with discrete samples collected at one location in the bay. The spring phytoplankton bloom (up to 29.4 mg chlorophyll m) is an annual feature at the study site and its timing may vary by up to 50 days between years. The variability in the underwater light climate and turbulent mixing are identified as key factors controlling the timing of phytoplankton blooms. Modelled average annual gross and net production are estimated to be 223 and 56 g C m year, respectively. Light microscope counts showed that the phytoplankton community is dominated by diatoms, with dinoflagellates appearing annually for short periods of time between July and October. The zooplankton community at the study site is dominated by copepods and use of a fine mesh (80 µm) resulted in higher abundances of copepods determined (up to 2.5×10 ind. m) than has previously reported for this location. There is a strong seasonal cycle in copepod biomass and copepods greater than 270 µm contribute less than 10% of the total biomass. Seasonal trends in copepod biomass lag those in the phytoplankton community with a delay of 3 to 4 months between the maximum phytoplank-ton biomass and the maximum copepod biomass. Grazing by copepods exceeds net primary production at the site and indicates that an additional advective supply of carbon is required to support the copepod community. © 2011 Springer Science+Business Media, LLC

show abstract

Section: Controls On Phytoplankton Bloom Dynamicsmentioning

confidence: 99%

Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…Being able to represent ROFI dynamics accurately across temporal and spatial scales is therefore important for coastal management in relation to the transfer and fate of particles and nutrients in coastal seas. It is in this region that tidal and seasonal cycles influence sediment transport (e.g., Brown et al, 2015), pulses in primary productivity (e.g., Panton et al, 2012), and the trajectories of pollutants (e.g., Periáñez, 2005). To improve the understanding of physical processes within ROFIs, large scale observational campaigns (e.g.…”

Section: Introductionmentioning

confidence: 99%

Impact of operational model nesting approaches and inherent errors for coastal simulations

et al. 2016

View full text Add to dashboard Cite

A region of freshwater influence (ROFI) under hypertidal conditions is used to demonstrate inherent problems for nested operational modelling systems. Such problems can impact the accurate simulation of freshwater export within shelf seas, so must be considered in coastal ocean modelling studies. In Liverpool Bay (our UK study site), freshwater inflow from 3 large estuaries forms a coastal front that moves in response to tides and winds. The cyclic occurrence of stratification and remixing is important for the biogeochemical cycles, as nutrient and pollutant loaded freshwater is introduced into the coastal system. Validation methods, using coastal observations from fixed moorings and cruise transects, are used to assess the simulation of the ROFI, through improved spatial structure and temporal variability of the front, as guidance for best practise model setup. A structured modelling system using a 180 m grid nested within a 1.8 km grid demonstrates how compensation for error at the coarser resolution can have an adverse impact on the nested, high resolution application. Using 2008, a year of typical calm and stormy periods with variable river influence, the sensitivities of the ROFI dynamics to initial and boundary conditions are investigated. It is shown that accurate representation of the initial water column structure is important at the regional scale and that the boundary conditions are most important at the coastal scale. Although increased grid resolution captures the frontal structure, the accuracy in frontal position is determined by the offshore boundary conditions and therefore the accuracy of the coarser regional model.

show abstract

Scales and structure of frontal adjustment and freshwater export in a region of freshwater influence

Hopkins

Polton

2011

Ocean Dynamics

Self Cite

View full text Add to dashboard Cite

Sea surface temperature satellite imagery and a regional hydrodynamic model are used to investigate the variability and structure of the Liverpool Bay thermohaline front. A statistically based water mass classification technique is used to locate the front in both data sets. The front moves between 5 km and 35 km in response to spring-neap changes in tidal mixing, an adjustment that is much greater than at other shelf-sea fronts. Superimposed on top of this fortnightly cycle are semi-diurnal movements of 5-10 km driven by flood and ebb tidal currents. Seasonal variability in the freshwater discharge and the density difference between buoyant inflow and more saline Irish Sea water give rise to two different dynamical regimes. During winter, when cold inflow reduces the buoyancy of the plume, a bottom-advected front develops. Over the summer, when warm river water provides additional buoyancy, a surface-advected plume detaches from the bottom and propagates much larger distances across the Bay. Decoupled from near-bed processes the position of the surface front is more variable.Fortnightly stratification and re-mixing over large areas of Liverpool Bay is a potentially important mechanism by which fresh water, and its nutrient and pollutant loads, are exported from the coastal plume system. Based on length scales estimated from model and satellite data the erosion of post-neap stratification is estimated to be responsible for exporting approximately 19% of the fresh estuarine discharge annually entering the system. Although the baroclinic residual circulation makes a more significant contribution to fresh-

show abstract

Short-term and seasonal variation in metabolic balance in Liverpool Bay

Cited by 3 publications

References 43 publications

Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay

Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay

Impact of operational model nesting approaches and inherent errors for coastal simulations

Scales and structure of frontal adjustment and freshwater export in a region of freshwater influence

Contact Info

Product

Resources

About