Nitrogen flux estimates in support of Chesapeake Bay Hypoxia and Anoxia forecasts, 1985-2024

Data release includes the U.S. Geological Survey (USGS) estimate of spring nitrogen fluxes summed from nine tributaries to the Chesapeake Bay from 1985 to 2024. Data are presented as the sum from tributaries within the USGS River Input Monitoring (RIM) network identified by site numbers: 01491000, 01578310, 01594440, 01646580, 01668000, 01673000, 01674500, 02035000, 02041650. Periods of estimation include January through May and November through May. The estimates are made using up-to-date streamflow and all total nitrogen analyses available as of June 1 of the reporting year.

本次发布的数据包含美国地质调查局（U.S. Geological Survey, USGS）针对1985年至2024年期间，九条汇入切萨皮克湾（Chesapeake Bay）的支流的春季氮通量总和估算值。该数据基于美国地质调查局河流输入监测（River Input Monitoring, RIM）网络内的指定站点汇总得到，对应站点编号依次为：01491000、01578310、01594440、01646580、01668000、01673000、01674500、02035000、02041650。本次估算覆盖的时段为1月至5月，以及11月至5月。本次估算基于报告年份6月1日当天可获取的最新径流数据与所有总氮分析结果完成。