Introduction
============

The Hadley Centre has provided calculations of both the thermal
expansion component of sea-level rise and the total sea-level rise
(ie including ice mass balance terms) for two runs of the HadCM3
model.

Model
=====

HadCM3 is a coupled atmosphere-ocean GCM, developed at the Hadley
Centre (The Met. Office). It has a stable control climatology and does 
not use flux adjustment.

The atmospheric component of the model has 19 levels with a horizontal
resolution of 2.5 degrees of latitude by 3.75 degrees of longitude. The 
oceanic component of the model has 20 levels with a horizontal resolution
of 1.25 x 1.25 degrees. At this resolution it is possible to represent
important details in oceanic current structures. Horizontal mixing of tracers 
within the ocean uses a version of the Gent and McWilliams adiabatic 
diffusion scheme with a variable thickness diffusion parametrization.

Runs
====

GHG run
Includes time-varying forcing from major and minor greenhouse gases 
(IS95a after 1990) from 1859 to 2100.

GHG+SULPHATE run
Includes time-varying forcing from major and minor greenhouse gases 
(IS92a after 1990), anthropogenic sulphur cycle with direct plus indirect 
sulphate aerosol effects, and variations in tropospheric ozone based partly 
on off-line chemistry calculations broadly consistent with IS92a, from 1859 
to 2100.


Notes
=====

1. The time series showing total sea-level rise are comprised of
   thermal expansion, melting of small glaciers, and mass balance 
   changes for Greenland and Antarctica.  

2. The glacier calculations do not include a change in area.

3. The mass balance changes for Greenland and Antarctica were
   estimated using a simple sensitivity calculation, not the
   ice-sheet model of Huybrechts.