Grazinglands Research Laboratory site, station NADP Station OK17, Kessler Farm Field Laboratory, OK, 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 Grazinglands Research Laboratory (GRL)
contains sulfate in precipitation (volume-weighted concentration) measurements in milligramsPerLiter units
and were aggregated to a monthly timescale.

EcoTrends项目由德布拉·彼得斯博士（约纳盆地长期生态研究站（Long-Term Ecological Research, LTER），美国农业部农业研究局约纳实验牧场）与阿里尔·卢戈博士（卢基略LTER，美国农业部林务局卢基略实验森林）于2004年创立，旨在支撑长期生态数据集的采集与分析工作。本项目为一项大型综合研究计划，致力于提升长期数据的可获取性与复用性。目前共有约50个由州政府及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LTER站点，以及美国农业部农业研究局（Agricultural Research Service, ARS）、美国农业部林务局、美国能源部、美国地质调查局（United States Geological Survey, USGS）资助的站点与众多高校站点。EcoTrends项目的数据集可通过探索性网络门户（http://www.ecotrends.info）获取。该门户依托交互式网络应用，为用户提供持续的数据整合与数据获取服务。作为LTER溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，持续开展的数据整合工作通过人工与自动两种处理方式完成更新。本网络门户由约纳LTER与LTER网络办公室合作开发。本次来自牧场研究实验室（Grazinglands Research Laboratory, GRL）的数据集包含降水硫酸盐（体积加权浓度）测量数据，单位为毫克每升（mg/L），数据已聚合至月尺度。