North Temperate Lakes site, station NADP Station WI36, Trout Lake, WI, study of calcium 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 North Temperate Lakes (NTL)
contains calcium 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（约那盆地长期生态研究站，Jornada Basin LTER；美国农业部农业研究服务局约那实验牧场，USDA-ARS Jornada Experimental Range）与阿里尔·卢戈博士（卢奎洛长期生态研究站，Luquillo LTER；美国农业部森林服务局卢奎洛实验林，USDA-FS Luquillo Experimental Forest）于2004年创立，旨在支撑长期生态数据集的采集与分析工作。本项目为大型综合研究计划，核心目标是提升长期生态数据的可获取性与利用效率。目前，已有约50个由州政府及联邦政府资助的研究站点参与并向EcoTrends项目贡献数据，其中涵盖全部26个长期生态研究（Long-Term Ecological Research，简称LTER）站点，以及由美国农业部农业研究服务局（USDA-ARS，简称ARS）、美国农业部森林服务局、美国能源部（US Department of Energy）、美国地质调查局（US Geological Survey，简称USGS）及众多高校资助的研究站点。EcoTrends项目的数据可通过探索性网络门户（http://www.ecotrends.info）获取。该网络门户依托交互式网页应用，为用户持续开展数据汇编与数据获取提供支持。作为LTER溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture，简称PASTA）的组成部分，持续进行的数据汇编工作将通过人工与自动两种处理方式完成更新。本网络门户由约那LTER与LTER网络办公室联合开发。本次发布的北温带湖泊（North Temperate Lakes，简称NTL）数据集包含以毫克每升为单位的降水钙体积加权浓度实测值，且已聚合至月尺度。