Baltimore Ecosystem Study LTER site, station NADP Station MD13, Wye, MD, study of sulfate in precipitation (volume-weighted concentration) in units of milligramsPerLiter on a monthly timescale

The EcoTrends project was established in 2004 by Dr. Debra Peters
(Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and
Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest)
to support the collection and analysis of long-term ecological datasets.
The project is a large synthesis effort focused on improving the accessibility
and use of long-term data. At present, there are ~50 state and federally funded
research sites that are participating and contributing to the EcoTrends project,
including all 26 Long-Term Ecological Research (LTER) sites and sites funded by
the USDA Agriculture Research Service (ARS), USDA Forest Service,
US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal
(http://www.ecotrends.info). This web portal enables the continuation of data
compilation and accessibility by users through an interactive web application.
Ongoing data compilation is updated through both manual and automatic
processing as part of the LTER Provenance Aware Synthesis Tracking
Architecture (PASTA). The web portal is a collaboration between the Jornada LTER
and the LTER Network Office. The following dataset from Baltimore Ecosystem Study LTER (BES)
contains sulfate in precipitation (volume-weighted concentration) measurements in milligramsPerLiter units
and were aggregated to a monthly timescale.

EcoTrends项目由黛布拉·彼得斯博士（约尔纳达盆地长期生态研究站（Long-Term Ecological Research, LTER），美国农业部农业研究服务局约尔纳达实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究站（Long-Term Ecological Research, LTER），美国农业部林业局卢奎洛实验森林）于2004年创立，旨在支撑长期生态数据集的收集与分析工作。
该项目是一项大型综合研究计划，核心目标为提升长期生态数据的可获取性与复用率。
目前共有约50个由州政府与联邦政府资助的研究站点参与EcoTrends项目并贡献数据，其中涵盖全部26个长期生态研究（Long-Term Ecological Research, LTER）站点，以及由美国农业部农业研究服务局（ARS）、美国农业部林业局、美国能源部、美国地质调查局（USGS）与众多高校资助的研究站点。
EcoTrends项目的数据集可通过探索性网络门户（http://www.ecotrends.info）获取。该门户依托交互式Web应用程序，支持用户持续开展数据汇编与数据获取工作。
作为长期生态研究溯源感知综合跟踪架构（PASTA）的组成部分，正在推进的数据汇编工作将通过手动与自动两种处理方式完成更新。
该网络门户是约尔纳达LTER与LTER网络办公室的合作成果。
下述来自巴尔的摩生态系统研究长期生态研究站（BES）的数据集，包含降水硫酸盐（体积加权浓度）的实测数据，单位为毫克每升，且已被聚合至月尺度。