Earth system interactions on a changing planet
GES12 integrates research across the Earth’s spheres: the lithosphere, hydrosphere, atmosphere and biosphere and focuses on the dynamic interaction between all these Earth systems. These strong connections are reflected in the eight themes described below – each of them encompassing research at the forefront of Earth system science.
Interactions between the planet’s solid surface and its interior, the biosphere, the atmosphere and the cryosphere determine conditions for abiotic dynamics and life on Earth, and have continuously changed throughout times on various space and timescales. Changes range from continental drifts, solar irradiance variability, concomitant ice accumulation and sea level modulations, periods of enhanced volcanism, all the way to anthropogenic global change, in particular with respect to present and future climate. This session invites contributions on these variable interactions, including their impact on the whole planet in general and on terrestrial life in particular.
Biogeochemical cycles of major elements, e.g., C, N and S, and trace elements, e.g., halogens, metals and metalloids, play a major role in environmental (e.g., ecosystem health), climatic (e.g. green house gases, tropospheric ozone removal) and/or geological processes (e.g. weathering, CO2 sequestration). In this session we welcome exciting research contributions that give new insights on biogeochemical cycling of major and trace elements in all Earth’s surface compartments – air, soil and water. Contributions to the session may include fundamental research on transport pathways and on elemental cycles under climatic and environmental change, field, laboratory and theoretical studies at scales ranging from molecular to global as well as advances in analytical techniques and model-based approaches.
Microbial metabolic activity involves millions of interactions between the environment and microbes, shaping the geochemistry of the earth surface. Over the last decades, biogeochemical research has led to an advanced understanding of the microbial players, pathways, and interlinks between various element cycles, with multiple discoveries of new types of microbes and metabolisms of evolutionary significance. This session focuses on the application of geochemical, isotopic and molecular tools that allow new insights into novel biogeochemical pathways in “redox-transitional” environments, the organisms that perform them, as well as their eco-physiology, today and in the past.
It has long been recognized that we cannot understand our planet’s history without understanding how organisms have influenced, and have been influenced by, the Earth’s environment. In this session we encourage submissions presenting new approaches and new records reconstructing the coevolution of Earth and life since its appearance on our planet. These may include reconstructions of the history of the oxygenation of the atmosphere, of marine chemistry and of biological evolution across major extinctions and radiation events.
Geochemistry plays a key role in human health. For example, geochemical processes can lead to uneven environmental distributions of trace elements in aqueous systems, soils and food, resulting in trace element toxicity and deficiency. Also, geochemical methods are increasingly developed and used for medical research. In this session we invite contributions from all fields of research linking geochemistry to health and life sciences. Contributions may include studies of processes controlling trace element pathways in the environment and into organisms, analytical advances in trace element speciation in biological materials, as well as studies of human samples using geochemical methods.
The oceanic dissolved reservoir of major and trace elements supported the first life on our planet, and continues to support almost half the photosynthesis on Earth today. This session will highlight new tools and ideas in this field, including those emanating from the GEOTRACES programme. We particularly encourage contributions that seek to understand the importance of interfaces with other compartments of the surface Earth – the lithosphere, the atmosphere and the biosphere – as sources, sinks and drivers of internal cycling.
Microbial life occupies about every ecological niche in the environment and influences a very large varieties of processes. In this session we aim at exploring the couplings and feedback mechanisms between microbial activity and mineral formation and dissolution at different temporal and spatial scales. We encourage contributions exploring microbe-mineral interactions with an interdisciplinary perspective in natural environments, as well as biotechnological applications such as for the extraction and recovery of metals.
During almost 20 years since its foundation, Critical Zone science has developed a worldwide network of researchers and observatories promoting a new, integrated and multidisciplinary study of Earth’s living skin. In this session we invite contributions presenting the latest results on the characterization, evolution and functioning of the critical zone as well as contributions discussing visions on the future development of critical zone science.