Chemistry of rainfall, throughfall and stream water from El Verde and Bisley

Rain, throughfall, and stream water are collected weekly at the LEF sites listed below. These data sets begin as early as 1983; LTER sampling began in 1988. Rain and throughfall samples are the total catch for the week, and are exposed to field conditions for that time. No event sampling is conducted on a routine basis. Stream water samples are grab samples taken from the water/air interface at stream channel center on the sampling day (usually Tuesdays). Rain samples from WDEV are wet only from an automatically-closing collector that prevents any dry deposition (Aerochem Metrics NADP collector). RCEV and RCB are bulk or always-open collectors that receive dry deposition by sedimentation. A continuous record of stream stage (height) is recorded by a datalogger at all ongoing stream sampling sites. Average daily streamflows are available from the USGS and at other locations (Hydrology and Meteorology) on this site. All samples are measured for pH and conductivity, and then filtered (pre-combusted Whatman GF/F glass fiber filter) prior to further analysis. From 1983-1994 samples were cooled and returned to the San Juan chemistry laboratory for analysis. During those years, samples for NH4 and NO3 analyses were refrigerated continuously until analysis. Subsamples for NH4 analysis were also preserved with 1 molar HCl. From 1994 on, samples for NH4 and NO3 were frozen until analysis, were not acidified, and all analyses were conducted at the University of New Hampshire. Rain, Throughfall, and Stream water Sampling Sites Descriptions of LTER LUQ rain, throughfall, and stream water weekly sample chemistry data from 1988 onwards. Chemical concentrations are recorded as mg/L or mg/L as appropriate. Values below detection limits are recorded as 1/2 the detection limit. Site Abbreviation Description Comments Rain collector Bisley RCB Bulk collector Rain collector El Verde RCEV Bulk collector Wet/dry El Verde WDEV Wet only collector Throughfall Bisley TFB=TCB TF bulk 10-collector composite Bisley gap BGAP TF bulk 10-collector composite Quebrada Sonadora QS El Verde stream Quebrada Toronja QT El Verde stream Quebrada Toronja 1 QT1 El Verde stream Quebrada Prieta A QPA El Verde stream Quebrada Prieta B QPB El Verde stream Quebrada Prieta QP El Verde stream Río Mameyes Puente Roto MPR(1) Bisley stream (1)Previously "PRM" Quebrada Cuenca 1 Q1 Bisley stream Quebrada Cuenca 2 Q2 Bisley stream Quebrada Cuenca 3 Q3 Bisley stream Río Mameyes Gage MG Bisley stream Río Icacos RI LEF South stream Quebrada Guabá Q