Average Accumulated Exceedance (AAE) of critical loads of acidity and nutrient nitrogen by acid and nitrogen deposition for the UK, 2015-2017

This data resource consists of two files: (a) 1x1 km resolution Average Accumulated Exceedance (AAE) data summarising the exceedances of acidity critical loads for eight habitats; (b) 1x1 km resolution AAE data summarising the exceedances of nutrient nitrogen critical loads for thirteen habitats. The data provide information on the amount of excess acid or nitrogen deposition above the critical load values set to protect acid- and nitrogen-sensitive habitats in the UK. The AAE has been calculated using UK 5x5 km Concentration Based Estimated Deposition (CBED) data for 2015-17 (see related data). The data were generated under Defra-funded work to assess the potential areas of acid and nitrogen sensitive habitats at risk of adverse impacts from excess atmospheric acid and nitrogen deposition. Reducing the area and amount of critical load exceedance continues to be a driver of Government policy on reducing emissions of acidic and nitrogen-containing air pollutants (sulphur dioxide, nitrogen oxides and ammonia). Full details about this dataset can be found at https://doi.org/10.5285/b65abf02-bfdb-4546-a3a3-26e829d80b38

本数据资源由两个文件组成：(a) 以1x1公里分辨率的平均累积超过量（AAE）数据，总结了八个生境的酸度临界负荷超过情况；(b) 以1x1公里分辨率的AAE数据，总结了十三种生境的氮营养临界负荷超过情况。这些数据提供了超过临界负荷值的过量酸或氮沉降量信息，该临界负荷值旨在保护英国酸性和氮敏感性生境。AAE的计算使用了2015-17年期间英国5x5公里浓度基于估计沉降（CBED）数据（参见相关数据）。这些数据是在环境、食品和农村事务部（Defra）资助的工作下生成的，旨在评估酸性和氮敏感性生境的潜在受大气酸性和氮沉降过量负面影响的风险区域。减少临界负荷超过面积和数量一直是政府减少酸性含氮空气污染物（如二氧化硫、氮氧化物和氨）排放政策的主要驱动力。有关本数据集的详细信息，请访问https://doi.org/10.5285/b65abf02-bfdb-4546-a3a3-26e829d80b38。