NEWS-model-predictions

Relatively few large rivers account for a large proportion of the N exported to coastal zones globaUy for ah N forms, based on NEWS model predictions. For example, the 25 rivers with the greatest water discharge globaUy (<0.5% of the rivers with a watershed >2500 km ) account for approximately half of the exported DIN and DON, and about a quarter of the exported PN, globaUy (Table 9.1). Some of... 

Figure NEWS-model-predicted (A) DIN, (B) DON, and (C) PN yield (kg N yr ) for 0.5 X 0.5 degree (latitude X longitude) or larger river basins globally for mid-1990 s conditions. Model output replotted from Beusen et al. (2005), Dumont et al. (2005), and Harrison et al. (2005b).

Table 9.2 DIN, PN, DON, total N (TN) export (Tg N yr ) by rivers, and exoreic land surface area (10 km ) for tropical (o°-23.5 ), temperate (23.5 -66 ), and polar (66 -90°) latitude bands and global totals, based on Global NEWS model predictions for mid-1990s (for spatially explicit representation of data, see Figs. 6.4 and 6.5)...

Figure 9 6 Dominant sources of N to the coastal zone by 0.5 X 0.5 degree or larger basin and relative contributions of sources of exported DIN and DON by latitude band as predicted by NEWS-DIN (A) and NEWS-DON (B). Global maps have been compressed horizontally to fit both map and bar graph in same figure. For actual values of predicted DIN and DON, see Tables 9.3 and 9.4. Model predictions have been reprocessed from Dumont et al. (2005) and Harrison etal. (2005b).

Table 9.3 DIN sources contribution of N sources in watersheds to the global DIN export by rivers by latitude bands and global total, as predicted by Global NEWS models for mid-1990s (Units Tg N yr )...

Haggin, J., New model predicts properties of porous solids, Chem. Eng. News, 17 June, 35 (1996). 

Fig. 2.7 The ozone hole over Antarctica in September of 2005 covered an area of more than 24 million square kUometers which is approximately equal to the area of North America. The ozone hole has been forming in the stratosphere over Antarctica since about 1970 as a result of the release of anthropogenic CFC gases into the atmosphere. Computer models now predict that the size of the ozone hole will begin to decline in 2018 and will stop forming altogether in 2068. This is good news because the ozone of the stratosphere absorbs ultraviolet radiation which can cause skin cancer and eye damage in humans and is harmM to marine organisms. The ozone content of the stratosphere over Antarctica has declined annually by about 70% below normal during September and October whereas the decline over the USA has only been between 3% and 6% (Cook-Andersen 2006 Photo courtesy of NASA)...

Environmental Modelling and Software With Environment Data News (1364-8152) (1873-6726). This journal publishes contributions in the form of research articles, reviews, and short communications as well as software and data news on recent advances in environmental modeling and/or software to improve the capacity to represent, understand, predict, or manage the behavior of environmental systems at all practical scales. 

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