| Executive
Summary of the inaugural AUSCORE meeting (1997) |
Massive
corals can provide high-resolution (annual and
sub-annual) proxy climate and environmental records for
the worlds shallow-water tropical ocean regions. The
tropical regions are poorly represented by other sources
of proxy climate records yet they are fundamental to
understanding the global climate system and its
variations. In particular, there is a need for
understanding the nature and possible causes of
inter-annual, decadal and longer time-scale variability
of the tropical ocean-atmosphere. There is also a need
for environmental managers to understand the natural
long-term variability of tropical marine ecosystems,
natural and unnatural changes in the systems and the
possible influence of land-use changes in adjacent
coastal regions. Massive corals can provide such
information both for the last several centuries (from
living corals) and for well-dated windows of the more
distant past (from well-preserved dead and fossil
corals). Proxy climate and environmental information is
stored in coral skeletons as growth characteristics (eg
skeletal extension, density and calcification; cf tree
rings) and through a wealth of isotopic and geochemical
tracers which become incorporated into the skeleton
during growth. Examples of information stored in coral
skeletons include sea-surface temperatures (SSTs), river
flow, rainfall, upwelling, salinity and anthropogenic
influences.
Australia is in a prime
position to exploit the records contained in coral
skeletons for three main reasons. First, Australia has
one of the richest sources of coral material in the
world; including living corals on the Great Barrier Reef
(GBR) and the more scattered reefs off northern and
western Australia, and from fossil corals at various
sites. Second, from a climatological perspective,
Australias shallow-water tropical ocean regions are
inextricably linked to the El Niño-Southern Oscillation
(ENSO), the western Pacific warm pool and monsoon
circulations. Proxy climate records from such sites will
be of national importance and also will provide the link
between international coral projects in the east-central
Pacific and Indian Oceans. Proxy tropical climate
records will also link to climate reconstructions
developed from tree rings (in Tasmania and New Zealand)
and ice cores (in Antarctica). Third, and perhaps most
importantly, Australia has already developed a
significant research capacity aimed at routinely
extracting records from corals. Australian researchers
have already made major contributions to the development
and application of sophisticated techniques for
extracting information from corals and to understanding
the processes whereby corals store (and distort)
environmental information.
The successes of the last
decade have established the international standing of
Australia in the field of coral-based paleoclimatology.
The purpose of the Australian
Coral Records Research Group
is to promote coordination of research at a national
level so as to maximise our potential contribution and
hasten the work to full fruition. It is hoped that this
coordination will lead to the "critical mass"
required to reconstruct high-resolution paleoclimatic
records for the tropics from their only known source.
|