Earth System Science
The Climate perspective

The Climate Perspective
The climate system is the atmosphere, oceans, biosphere, cryosphere, soils;
The feedbacks within and between all of these;
The biogeochemical fluxes with all of these;
On all timescales (but lets focus on the last 1000 years to the next 200 years);
Especially the carbon, methane, nitrogen and sulphur cycles
How Humans affect the climate via emissions of GHG, aerosols and land cover change

Slide 3
The Climate Perspective
We want to project possible future states:
Currently use “climate models”

Slide 5
The Climate Perspective
We want to project possible future states:
Currently use “climate models”
Will use “Earth System Models” – why ?
No physical experiment can be designed to explore ESS
No alternative to explore the full complexity of the Earth System

Slide 7
Earth System Models
Major international thrust from the classic physical sciences (WCRP), the biological and systems sciences (IGBP), the social sciences (IHDP) and DIVERSITAS

Earth System Science
Why does ESS need:
Soils: major carbon, nitrogen and methane sources/sinks
Ecosystems: carbon, structural feedbacks, biodiversity …
Palaeo-community: climate sensitivity, identification of non-linearities, surprises, climate averages and extremes.

Slide 10
Message for the Geosciences
how to build an understanding of the Earth System to permit reliable projections of the future given the non-linearities and surprises visible in the palaeo-record
How to take these projections and scale them to the scales useful to policy makers and planners
How to encourage the Australian scientific community to work together

Message for the Geosciences
How to encourage “Earth Sciences” to recognize that “Earth System Sciences” is not a simple addition of a word … it’s the addition of biology, chemistry, ecology, biogeochemical cycling, population science, technology science, economics, complex system theory, computer science …