Details of Plymouth Cruise Ship Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Plymouth Cruise Ship version of Plume Plotter.

Stack measurements

Stack location: 50.363909,-4.1560936.
Stack height: 48 m.
Stack diameter: 1.9 m.
Stack gas exit velocity: 24.6 m/s.
Stack gas temperature: 263 °C.

The following values are used for albedo, Bowen ratio and roughness length:

Albedo: 0.25.
Bowen ratio: 0.75.
Roughness length: 0.15.

Emissions

The emissions are based on a typical mid-size cruise ship of the type expected to visit Plymouth in 2022. A hotel power requirement of 4MW is representative with machinery meeting IMO Tier 1 emission standard (for ships built after 2011, NOx levels will be 15% lower). NOx and particulates levels are based on studies of cruise ships berthed at cruise ship terminals.

The emission rates of pollutants are listed below:

Pollutant	Emission rate per second
Oxides of nitrogen	15 g
Particulates PM10	610 mg
Sulphur dioxide	N/A
TOC	N/A
Carbon monoxide	N/A
Hydrogen chloride	N/A
Hydrogen flouride	N/A
Ammonia	N/A
Cadmium and thallium	N/A
Mercury	N/A
Arsenic	N/A
Chromium	N/A
Nickel	N/A
Other metals	N/A
Dioxins and furans	N/A
PAH	N/A
PCBs	N/A

Background levels

The background levels of pollutants are taken from [1]:

Pollutant	Background concentration per m³
Oxides of nitrogen	15.3 μg
Particulates PM10	13.3 μg
Sulphur dioxide	7.1 μg
TOC	330 ng
Carbon monoxide	134 μg
Hydrogen chloride	410 ng
Hydrogen flouride	3 ng
Ammonia	1 μg
Cadmium and thallium	90 pg
Mercury	10 pg
Arsenic	410 pg
Chromium	520 pg
Nickel	1.96 ng
Other metals	10.68 ng
Dioxins and furans	8.5 fg
PAH	121 pg
PCBs	1.724 ng

Weather data

Wind speed, wind direction, temperature, pressure, and solar radiation are the latest values reported by one of two weather stations. If a value is not available from the primary weather station it is obtained from the secondary weather station. (Some weather stations do not measure solar radiation at all.) The primary weather station is and the secondary weather station is .

Upper air data is the latest reported by the Camborne upper air station.

References

1. Energy from Waste Combined Heat and Power Facility, North Yard, Devonport: Air Quality Dispersion Modelling Report, May 2011.