Geoscience Reference
In-Depth Information
(a)
Maximum
10
9
8
7
6
5
4
3
2
1
0
8.2
High
7.5
High (coral thickets)
6.3
4.4
Middle
4.0
Intermediate (Reef flat)
3.3
1.4
Low
'Complete' reef system
1.1
0.8
1990-2030 1990-2070 1990-2100
(b)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
8.2
High
7.5
6.3
4.4
Middle
4.0
3.3
1.4
1.1
Low
0.8
1990-2030 1990-2070 1990-2100
Fig. 9.23
(a) Rates of modern reef accretion for different reef subenvironments and for reef systems as a whole compared with low,
medium and high projections of global sea-level rise for three different time periods through to 2100. The different net accretion rates
that occur in different reef subenvironments reflect differences in rates of coral growth and coral substrate degradation (see Perry 1999).
(b) Rates of Holocene reef growth based on radiocarbon-dated drilled core-sections superimposed above low, medium and high
projections of global sea-level rise for three different time periods through to 2100. The often high average rates of accretion during the
Holocene reflect growth under different regimes of sea-level rise during the Holocene transgression. Projections based on IS92a
emissions scenario. (Adapted from Spencer 1995.)
