National Atmospheric Deposition Program (NADP): Seasonal Wet Depositions Totals (kg/ha), 1992 - Present

The National Atmospheric Deposition Program/National Trends Network (NADP/NTN) is a nationwide network of precipitation monitoring sites. The network is a cooperative effort between many different groups, including the State Agricultural Experiment Stations, U.S. Geological Survey, U.S. Department of Agriculture, and numerous other governmental and private entities. For a full list of contributors, see the collaborating agencies page. The NADP/NTN has grown from 22 stations at the end of 1978, our first year, to over 250 sites spanning the continental United States, Alaska, and Puerto Rico, and the Virgin Islands.

国家大气沉降项目/国家趋势网络（National Atmospheric Deposition Program/National Trends Network，简称NADP/NTN）是覆盖全美范围的降水监测站点网络。该网络由多方协作共建，参与主体包括各州农业试验站、美国地质调查局、美国农业部，以及众多其他政府与私营机构。若需查阅完整的贡献者名单，请访问合作机构页面。NADP/NTN的站点数量已从首个运营年度1978年末的22个，增长至覆盖美国本土、阿拉斯加、波多黎各以及美属维尔京群岛的250余个监测站点。