Table 5. Model boundary conditions and forcing


Variable (and units) Loch Fyne Loch Creran
Volume of box (106 m3) [2132] [83]
Depth of box (m) [13] [7]
box Exchange Rate (d-1) [0.021] [0.22]
Solar irradiance (W m-2) solar radiation climatology for N-W Scotland daily values for 1978 from Dunstaffnage meteorological station (Tyler 1983)
River discharge (m3 d-1) daily values for 2003 from Loch Fyne catchment and rainfall daily values for 1978 from scaled-up flow guage in river Creran (Tyler 1983)
Nutrients in river
(mmol m-3)
typical value for each nutrient in highland run-off (Portilla et al. 2009) typical value for each nutrient in highland run-off (Portilla et al. 2009)
Nutrients at sea-boundary (mmol m-3) [daily values in layer 2 of ACExR-LESV simulation for loch Fyne, 2003] [daily values in layer 2 of ACExR-LESV simulation for loch Creran, 1975]
chlorophyll at sea- boundary (mg m-3) [daily values in layer 2 of ACExR-LESV simulation for loch Fyne, 2003] [daily values in layer 2 of ACExR-LESV simulation for loch Creran, 1975]
POC§ in river (mg m-3) 0 0
POC at sea-boundary
(mg m-3)
seasonal climatology from loch Creran (Jones 1989) seasonal climatology from loch Creran (Jones 1989)
heterotroph fraction, η 0.125 0.125
autotroph chlorophyll yield from nitrogen, XqNa in q = XqNa.(1- η) 2.2 mg chl (mg-at N)-1 2.2 mg chl (mg-at N)-1
light attenuation coefficient at 0 chlorophyll 0.2 m-1 0.2 m-1
employees 0.25/mussel line
10 FTE + seasonal/250 berths
n.a.
wages 16,667/FTE.year n.a.
revenues 2.4/wet kg mussels
130/yacht.night
n.a.
values in square brackets were those taken from simulations with the ACExR-LESV model of Portilla et al. (2009) and Tett et al. (2010). The model used forcings for years 2003 (Loch Fyne) or 1975 (Loch Creran) where possible, otherwise Clyde Sea climatologies (Slesser and Turrell 2005) for Loch Fyne and Firth of Lorne climatologies (Portilla et al. 2009) for Loch Creran.
all other microplankton parameters were calculated from the two adjustable parameters:the 'heterotroph fraction', η (Tett and Wilson 2000), and the chlorophyll yield q (Gowen et al. 1992), and the equations and constants given by Portilla et al. (2009).
§POC = Particulate Organic Carbon.