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Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence

Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence
Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence
This paper presents data for the temporal and spatial distribution of nutrients in Liverpool Bay between 2003 and 2009 and an analysis of inputs of nutrients from the major rivers. The spatial distribution of winter nutrient concentrations are controlled by the region of freshwater influence (ROFI) in Liverpool Bay through the mixing of riverine freshwater and Irish Sea water, with strong linear relationships between nutrient concentration and salinity between December and February. The location of highest spring and summer phytoplankton biomass reflects the nutrient distributions as controlled by the ROFI. Analysis of 7 years of data showed that the seasonal cycle of winter maximum nutrient concentrations in February and drawdown in April/May is a recurrent feature of this location, with the timing of the drawdown varying by several weeks between years. A comparison of observed nutrient concentrations in Liverpool Bay with those predicted from inputs from rivers has been presented. Nutrient concentrations in the rivers flowing into Liverpool Bay were highly variable and there was reasonable agreement between predicted freshwater nutrient concentrations using data from this study and riverine nutrient concentrations weighted on the basis of river flow, although the exact nature of mixing between the rivers could not be determined. Predicted Irish Sea nutrient concentrations in the winter were lower than those reported for the input waters of the North Atlantic, supporting findings from previous work that nitrogen is lost through denitrification in the Irish Sea.
Nutrients, ROFI, Eutrophication, Liverpool Bay
1616-7341
2181-2199
Greenwood, Naomi
abfb0708-96a0-4c2b-bb0b-fd8339a9f7ed
Hydes, David J.
ac7371d4-c2b9-4926-bb77-ce58480ecff7
Mahaffey, Claire
6c868a01-2c9b-48b0-ae08-9ecf6b870032
Wither, Andrew
147d897e-0c1c-494b-be6b-f9f887f62f2e
Barry, Jon
122973aa-7a29-4f36-9e16-c1e286733d21
Sivyer, David B.
ff4025e8-072e-4085-965c-7cc0a0d4ce0a
Pearce, David J.
9cbc2ae2-078d-47ef-9bee-e3ab0a81e2d6
Hartman, Susan E.
2f74a439-395a-4ee7-89a2-eff4cc8d9481
Andres, Olga
c59aa116-d272-485f-a5b1-cec6158eded7
Lees, Helen E.
7345d41d-e79a-437d-81a4-28a6faede33c
Greenwood, Naomi
abfb0708-96a0-4c2b-bb0b-fd8339a9f7ed
Hydes, David J.
ac7371d4-c2b9-4926-bb77-ce58480ecff7
Mahaffey, Claire
6c868a01-2c9b-48b0-ae08-9ecf6b870032
Wither, Andrew
147d897e-0c1c-494b-be6b-f9f887f62f2e
Barry, Jon
122973aa-7a29-4f36-9e16-c1e286733d21
Sivyer, David B.
ff4025e8-072e-4085-965c-7cc0a0d4ce0a
Pearce, David J.
9cbc2ae2-078d-47ef-9bee-e3ab0a81e2d6
Hartman, Susan E.
2f74a439-395a-4ee7-89a2-eff4cc8d9481
Andres, Olga
c59aa116-d272-485f-a5b1-cec6158eded7
Lees, Helen E.
7345d41d-e79a-437d-81a4-28a6faede33c

Greenwood, Naomi, Hydes, David J., Mahaffey, Claire, Wither, Andrew, Barry, Jon, Sivyer, David B., Pearce, David J., Hartman, Susan E., Andres, Olga and Lees, Helen E. (2011) Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence. Ocean Dynamics, 61 (12), 2181-2199. (doi:10.1007/s10236-011-0463-y).

Record type: Article

Abstract

This paper presents data for the temporal and spatial distribution of nutrients in Liverpool Bay between 2003 and 2009 and an analysis of inputs of nutrients from the major rivers. The spatial distribution of winter nutrient concentrations are controlled by the region of freshwater influence (ROFI) in Liverpool Bay through the mixing of riverine freshwater and Irish Sea water, with strong linear relationships between nutrient concentration and salinity between December and February. The location of highest spring and summer phytoplankton biomass reflects the nutrient distributions as controlled by the ROFI. Analysis of 7 years of data showed that the seasonal cycle of winter maximum nutrient concentrations in February and drawdown in April/May is a recurrent feature of this location, with the timing of the drawdown varying by several weeks between years. A comparison of observed nutrient concentrations in Liverpool Bay with those predicted from inputs from rivers has been presented. Nutrient concentrations in the rivers flowing into Liverpool Bay were highly variable and there was reasonable agreement between predicted freshwater nutrient concentrations using data from this study and riverine nutrient concentrations weighted on the basis of river flow, although the exact nature of mixing between the rivers could not be determined. Predicted Irish Sea nutrient concentrations in the winter were lower than those reported for the input waters of the North Atlantic, supporting findings from previous work that nitrogen is lost through denitrification in the Irish Sea.

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More information

Published date: 2011
Keywords: Nutrients, ROFI, Eutrophication, Liverpool Bay
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 207455
URI: https://eprints.soton.ac.uk/id/eprint/207455
ISSN: 1616-7341
PURE UUID: 0b253811-af80-45d8-bbb6-174d2a86ca31

Catalogue record

Date deposited: 10 Jan 2012 09:28
Last modified: 16 Jul 2019 23:15

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