The oceanic N2O emissions play a major role in the atmospheric N2O budget (see for example Bange, 2006a). In the Fourth Assessment Report of the IPCC, mean annual N2O emissions (ranges are given in parenthesis) of 3.8 (1.8-5.8) X 1012g (Tg) N and 1.7 (0.5-2.9) Tg N were attributed to the open ocean and coastal areas (including rivers), respectively (IPCC, 2007). According to the IPCC report, open ocean and coastal areas (including rivers) represent about 21 per cent and 10 per cent of the total natural and anthropogenic N2O sources of 17.7Tg N yr-1, respectively (IPCC, 2007). There are various reasons for the considerable ranges of uncertainty in the global N2O emission estimates (Bange, 2008):
• different methodological approaches (empirical models versus extrapolation of measurements),
• the application of different air-sea exchange models and
• the fact that the applied classification of coastal areas is not uniform.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.