The symposium (second of this type - the first one was held in 1993) is 
being organized by the International Atomic Energy Agency (Isotope Hydrology 
Section) and will be held at the Vienna International Center from 14 to 18 
April 1997.

The forthcoming symposium will cover a broad spectrum of applications of 
isotope techniques in studies of past and current environmental changes in 
the hydrosphere and the atmosphere. Consequently, the participation of 
scientists representing different branches of geosciences and life sciences 
(climatologists, meteorologists, hydrologists, geochemists, geologists, 
biologists), in addition to modellers and isotope specialists, is desirable 
in order to discuss and exchange information in a comprehensive 
multidisciplinary approach.

Contributions are invited on the topics listed below and should be devoted 
to further development and refinement of isotope methods, including models 
for evaluation of isotopic data. New applications of isotope methods for 
tracing natural and man-induced changes within the atmosphere-hydrosphere 
system are most welcome. It is hoped that the Symposium will stimulate more 
efficient and wide-spread use of isotope techniques in Global Change 

The programme of the Symposium will comprise invited keynote lectures, 
contributed oral presentations and poster sessions and panel discussion.

Papers are solicited on the following topics

I. Isotopes in atmospheric studies:

Isotopic composition of atmospheric moisture and precipitation; water vapour 
transport in the atmosphere; isotopes as a calibration tool for regional and 
global models of atmospheric circulation; dispersion and transport of 
pollutants in the atmosphere; isotope characteristics of atmospheric 
greenhouse gases; reconstruction of past atmospheric levels of greenhouse 
gases; isotope constraints on sources and sinks of greenhouse gases; 
anthropogenic impact on atmospheric levels of greenhouse gases.

2. Interaction between atmosphere and hydrosphere under athropogenic stress:

Air-sea interactions; contaminant transport through surface water systems; 
recent changes in large aquatic systems (Caspian Sea, lake Bajkal, Great 
Salt Lake, internal seas); man-induced perturbations of the 
soil-plant-atmosphere system on a local and regional scale; impact of 
large-scale deforestation on regional climate and hydrology; 
rainfall-recharge relationship under different climatic regimes.

3. Pollution and degradation of water resources:

Transport of contaminants in the unsaturated zone; identification of sources 
and behaviour of contaminants in groundwater; man-induced salinisation of 
groundwater resources; impact of urbanization on the hydrological cycle; 
interaction of waste disposal sites with regional groundwater systems; 
impact of the mining industry on regional hydrological systems.

4. Isotope indicators of past climatic and environmental changes:

Response of hydrological systems to climate change; polar ice sheets and 
high mountain glaciers as archives of climatic and environmental changes; 
palaeowaters as archives of palaeoclimate; lacustrine deposits as archives 
of climatic and environmental changes; other indicators of climatic and 
environmental changes (terrestrial and aquatic organic matter, freshwater 
carbonates, speleothems,
phospates, etc.)

4. Advances in isotope analytical techniques:

Recent developments in isotope dating techniques; C-14, Th/U and other 
chronologies; new isotope tools for reconstructions of past climatic and 
environmental changes.

Requests to obtain full information about the symposium and participation 
forms should be directed to:

Ms. T. Niedermayr
Conference Services
International Atomic Energy Agency
Wagramerstrasse 5, P.O. Box 100
A-1400 Vienna
tel: 43-1-2060221312
fax: 43-1-20607
e-mail: [log in to unmask]