Ammonia Emissions from Native Soils (and Vegetation)

摘要

Unlike previous studies, this study allows for the calculation of direct ammonia emissions from native soils to be based on local meteorology and plant specific data rather than net emission factors from specific measurements. This study allows for the creation of a geographically specific emission inventory for ammonia emissions from native soils that can be modified from year to year whereas previous studies did not take into account changes in temperature from one year to the next. This study found that the apoplastic ratio has the greatest effect on the annual ammonia emission factors from native soils. A change in the apoplastic ratio from 155 to 630 will create an increase in ammonia emissions by a factor of 4. Other than the apoplastic ratio, ambient temperature and solar radiation can also affect the calculation of ammonia emissions from native soils. For example, when comparing 2005 and 2008, the ammonia emissions increased in the S JVAPCD but remained relatively constant in the BAAQMD and in the Sacramento PM_(2.5) nonattainment area. These changes are due to changes in temperature and solar radiation from 2005 to 2008.