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A new land surface model to monitor global river water environment by Staff Writers Beijing, China (SPX) Oct 16, 2020
Climate change and human activities, including heat emission, nitrogen (N) emission, and water management are altering the hydrothermal condition and N transport in the soil and river systems, thereby affecting the global nitrogen cycle and water environment. "We need to assess the impacts of these human activities on global river temperature and riverine N transport," said Prof. Zhenghui Zie with the Institute of Atmospheric Physics at the Chinese Academy of Sciences, "because quantitative assessment can not only improve our understanding of the material and energy cycle that occur in response to anthropogenic disturbances, but also contribute to protecting river ecosystems." Xie and his collaborators from the Chinese Academy of Sciences incorporated the schemes of riverine dissolved inorganic nitrogen (DIN) transport, river water temperature, and human activity into a land surface model, and thus developed a land surface model CAS-LSM. They applied the model to explore the impacts of climate change and anthropogenic disturbances on global river temperature and DIN transport. "We found that the water temperature of rivers in tropical zones increased at about 0.5oC per decade due to climate change from 1981 to 2010, and the heat emission of the once-through cooling system of thermal power plants further warmed the temperature. In Asia, power plants increased local river temperatures by about 60%." Said Dr. Shuang Liu, the lead author of the study published in Global and Planetary Change. Climate change determined the interannual variability of DIN exports from land to oceans, and water management controlled the retention of DIN by affecting the water cycle and river thermal processes. "From the perspective of anthropogenic N emission, we found the riverine DIN in the USA was affected primarily by N fertilizer use, the changes in DIN fluxes in European rivers was dominated by point source pollution, and rivers in China were seriously affected by both fertilization and point source emission." said Dr. Yan Wang, the lead author of the team's another study published in Journal of Advances in Modeling Earth Systems. In general, the results indicated that incorporating schemes related to nitrogen transport and human activities into land surface models could be an effective way to monitor global river water quality and diagnose the performance of the land surface modeling.
France's Engie sells crucial stake in Suez Paris (AFP) Oct 5, 2020 French power supplier Engie on Monday agreed to sell a nearly 30-percent stake in waste and water group Suez to rival Veolia, setting up a new phase in one of the country's most bitter takeover battles. Suez, which provides municipal water services in countries around the world, has repeatedly tried to scupper any deal and considers Veolia a competitor manoeuvring for a hostile takeover. The French state, which owns 22 percent of Engie, said it had voted against the 3.4 billion euros ($4 billion ... read more
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