Status: 

Ongoing

Title

Chemistry of rainfall and throughfall from El Verde and Bisley
Summary

Short name: 

LUQMetadata174

Data set ID: 

174

Abstract: 

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. 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.

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 H2SO4. 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 and Throughfall Sampling Sites
Descriptions of LTER LUQ rain and throughfall 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

 
Dates
Date Range: 
1983-11-21 00:00:00 to 2016-12-27 00:00:00
People

Owner/Creator: 

Contact: 

Additional Project roles: 

Name: Eda Melendez-Colom Role: Data Manager
Name: Frederick Scatena (In Memorium) Role: Associated Researcher
Name: Douglas A. Schaefer Role: Associated Researcher
Methodology

Methods: 

Analytical Techniques
pH - Electrometric with combination electrode
Conductivity - Conductivity bridge
Cl - up to 1989 by automated colorimetric analysis (thiocyanate); after 1989 by liquid chromatography with conductivity detection
NO3-N - up to 1989 by automated colorimetric analysis (Cd-Cu reduction); after 1989 by liquid chromatography with UV or conductivity detection
SO4-S - Liquid chromatography, conductivity detection
Na, K, Mg, and Ca - up to 1994 by atomic absorption spectroscopy; after 1994 by ion chromatography with conductivity detection
NH4-N - automated colorimetric analysis (phenolhypochlorite)
PO4-P - automated colorimetric analysis (molybdate blue)
DOC - up to 1998 by persulfate oxidation (McDowell et al. 1987); after 1998 by high temperature catalytic oxidation
TDN - prior to 1998 by persulfate oxidation and automated colorimetric analysis; after 1998 by high temperature catalytic oxidation with chemiluminescent detection
TDP - by persulfate digestion followed by automated colorimetric analysis
SiO2 - automated colorimetric analysis (molybdate blue)

Table 1. Data Abbreviations, Detection Limits, and Units of Measure

Datum

Abbreviation

Detection limit

Units

pH

pH

 

pH units 

Conductivity 

Cond

 

micromho/cm 

Chloride 

Cl

0.1

mg/L 

Nitrate 

NO3-N 

3-10

mg N/L 

Sulfate 

SO4-S

0.1

mg S/L

Sodium 

Na 

0.1

mg/L

Potassium

K

0.05

mg/L 

Magnesium 

Mg 

0.1

mg/L  

Calcium 

Ca 

0.1

mg/L

Ammonium 

NH4-N 

2-10

mg N/L 

Soluble Reactive Phosphate

PO4-P

3

mg P/L

Dissolved Organic Carbon

DOC

0.1

mg/L

Total Dissolved Nitrogen

TDN

0.1

mg/L

Total Dissolved Phosphorus

TDP

3

mg/L

Silica

SiO2

0.1

mg/L as SiO2

Instrumentation: 

Electrometric with combination electrode

Conductivity bridge

liquid chromatography with conductivity detection

liquid chromatography with UV or conductivity detection

ion chromatography with conductivity detection

automated colorimetric analysis (phenolhypochlorite)

automated colorimetric analysis (molybdate blue)

high temperature catalytic oxidation

high temperature catalytic oxidation with chemiluminescent detection

persulfate digestion

Additional information: 

This data set was  extracted from LTERDBAS  20  (Chemistry of rainfall, throughfall, and stream water from El Verde and Bisley Verde and Bisley stations) as it was in the previous system. Rain and Throughfall Collectors data were separated from streams and included in this data set.

Status: 

Ongoing

Time Period: 

Long-Term