A DATA SET is a series of observations collected by the same methodology. Each data set should have documentation sufficient for someone unfamiliar with the research to replicate the study. Data sets may be broken into subsets (data files) that are discrete in space and time, in that order. The documentation for a data set should include all spatial and temporal subdivisions of the data.

(Data, Abstract, Methods, Variables)

NOTES:

• Add rows to tables or lines to paraghaphs as you need them for entering your data.
• Contact emelendez@lternet.edu, if you have any question.

PERSON(S) COMPLETING THIS FORM: E-MAIL ADDRESS:

DATA SET IDENTIFIER: National Atmospheric Deposition Program/National Trends Network (NADP/NTN) Precipitation chemistry data from El Verde (PR20)

PROJECT TITLE: NADP Precipitation Chemistry Data

PROJECT DESCRIPTION : We report here the chemistry of weekly wet-only rainfall from the Luquillo Experimental Forest (LEF) NADP station (code PR20) for the period February 1985 through January 1996.  Our station was knocked out by Hurricane Hugo in September 1989, and not reestablished until May 1991. The station remains in active service to the present. Data from 1997on is missing on this site. Visit the NADP. NTN web site at : http://nadp.sws.uiuc.edu/nadpdata/state.asp?state=PR to get the data.

In overview, our site has more annual rainfall than any other in the NADP network, but in general that rain is less concentrated than that falling in the continental U.S. That means rain in the LEF is less acidic and deposits less nitrogen and sulfur than in the industrial northeast. However, since Puerto Rico is surrounded by ocean, the rain inputs of sodium and chloride are more than six times higher than in the continental U.S. Inputs of other ions fall within the range of values found in the continental U.S.

LTER CORE AREAS: (Annotate all that apply)

Inorganic Inputs

Disturbance Patterns

LEF LTER 1 RESEARCH TOPIC: (Annotate all that apply)

Environmental Monitoring

We define a data file as a component of a data set. A data set can have only one data file or more. Basically, different data files have different data structures or format.
DATA SET FILES (SUBSETS):

NOTE: For recent NADP/NTN Monitoring Location PR20 data visit the web site at: http://nadp.sws.uiuc.edu/sites/siteinfo.asp?id=PR20&net=NTN
Data File No.	Data File Identifier	On-Line Filename	Starting Date	Periodicity of sample	End Period
1	NADP/NTN Precipitation chemistry data	nadpdata.htm	February 12, 1985	Weekly	January 31, 1996

Observation: Data from 1997 onwards is available directly from the NADP/NTN web site: http://nadp.sws.uiuc.edu/nadpdata/state.asp?state=PR

RESEARCH LOCATION: At 350  m near the El Verde Field Station in the Tabonuco Forest (NADP Monitoring Location PR20)

INVESTIGATORS:

PRINCIPAL INVESTIGATORS E-MAIL address

Alonso Ramirez

Aramirez@ites.upr.edu

OTHER RESEARCHERS E-MAIL address

Douglas Schaefer

DSchaef53@hotmail.com

CONTACT PERSONS E-MAIL address Phone Number (Include area code)

Alonso Ramirez

Aramirez@ites.upr.edu

787-380-3220

SOURCE OF FUNDING (SPONSOR): LTER, NADP/NTN

DATA SET ABSTRACT: We report here the chemistry of weekly wet-only rainfall from the Luquillo Experimental Forest (LEF) NADP station (code PR20) for the period February 1985 through December 1996.  Our station was knocked out by Hurricane Hugo in September 1989, and not reestablished until May 1991.  The station remains in active service to the present and data from 1997 onwards is available directly from the NADP/NTN web site.

http://nadp.sws.uiuc.edu/nadpdata/state.asp?state=PR

Samples are collected weekly on Tuesdays, field measurements of pH and conductivity are made, and the water sample is shipped to NADP for chemical analysis.

DATA SET METHODS: Data files are divided into calendar years.  One data row corresponds to each weekly sample.  The data columns are starting and ending sampling dates (Year Month Day), ionic concentrations (in milligrams per liter ion weight), pH measured in lab and field, conductance (micromhos per centimeter) measured in lab and field, and depth of rain (millimeters).  Missing samples or analyses are indicated with "--".

REFERENCES:
A 13- year record of precipitation chemistry in the Luquillo experimental forest of Puerto Rico by Douglas A. Schaefer and William H. McDowell (in preparation)

CROSS-REFERENCES (other data sets related to this one): LTERDBAS 14: Rainfall at El Verde since 1975;  LTERDBAS 20: Chemistry of rainfall, throughfall and stream water from El Verde and Bisley; LTERDBAS 26: Rainfall and throughfall at Bisley tower;LTERDBAS 29: Daily rainfall (Bisley area), LTERDBAS 33: Meteorological data from towers (pre-Hugo) or rooftop (post Hugo) at El Verde; LTERDBAS 70: USDC NOAA's National Climatic Data Center daily precipitation (5 stations); LTERDBAS 77: National Atmospheric Deposition Program/National Trends Network (NADP/NTN) Precipitation chemistry data from El Verde (PR20); LTERDBAS 90: Bisley Tower I Meteorological data (Bisley Tower)

SAMPLE LOCATION: Samples of rainwater are archived at ambient temperatures and without chemical preservatives at the LUQ LTER site.  The NADP/NTN also archives samples from all stations in their network.

STORAGE SITES (of data files):  

INVESTIGATOR'S ASSIGNED KEYWORDS: Anthropogenic pollution, LTER, NADP, rain chemistry, rain forest, Sahara dust, seasonality, tropics, wet deposition.

LEF LTER OFFICIAL KEYWORDS  (See table): El Verde, tabonuco, biogeochemical cycles, cations and anions, nitrogen, phosphorus, climate, disturbance, drought, flood, hurricane, environmental variables, rainfall, water balance, peer-reviewed data set.

PUBLICATIONS:

DISSEMINATION: UNRESTRICTED. Use of this data should be cleared in advance with the data manager.  Follow standard acknowledgement for use of LTER data.  In addition, the following is the text approved by NADP/NTN for use of data from their network: National Atmospheric Deposition Program (NRSP-3)/National Trends Network. (2002). NADP Program Office, Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL 61820.

REASONS TO RESTRICT DATA IN THIS DATA SET BEYOND ITS TWO YEAR POLICY PERIOD*:

*WILL HAVE TO BE APPROVED BY LTER PRINCIPAL INVESTIGATORS: J. ZIMMERMAN, A. LUGO , D.J. LODGE

SITES DESCRIPTIONS:

Geographical positional system (GPS) Coordinates for each location:

location	latitude	longitude
NADP Rain Chemistry Tower	18o 19’ 22” N	65o 49’ 13” W

VARIABLES (ATTRIBUTES):                                             

FILE NAME OR #ABOVE (all in which the variable appears)	all	all	all	all	all
ABBREVIATION (as it appears on the data file)	SITECODE	STARTINGDATE	ENDINGDATE	CA(MG/LITER)	MG(MG/LITER)
NAME OF VARIABLE	Code of site	Starting date of sampling	Ending date of sampling	Calcium concentration	Magnesium concentration
DEFINITION OF VARIABLE	Site identification as assigned by NADP/NTN	Date when sampling begins with format (mm/dd/yyyy)	Date when sampling ends with format (mm/dd/yyyy)	Concentration of Calcium	Concentration of Magnesium
UNIT				milligramsPerLiter	milligramsPerLiter
PRECISION				0.01	0.01
RANGE OR LIST OF VALUES	PR20	850101, …	850101, …	0.01 and greater	0.01 and greater
DATA TYPE	alphanumeric	integer	integer	numeric	numeric
MISSING DATA CODES	none	none	none	blank field	blank field

VARIABLES (ATTRIBUTES):                                    

FILE NAME OR #ABOVE (all in which the variable appears)
ABBREVIATION (as it appears on the data file)	K(MG/LITER)	NA(MG/LITER)	NH4(MG/LITER)	NO3(MG/LITER)
NAME OF VARIABLE	Potassium concentration	Sodium concentration	Ammonium ion concentration	Nitrate ion concentration
DEFINITION OF VARIABLE	Potassium concentration	Sodium concentration	Ammonium ion concentration	Nitrate ion concentration
UNIT	milligramsPerLiter	milligramsPerLiter	Milligrams ion per Liter	Milligrams ion per Liter
PRECISION	0.01	0.01	0.01	0.01
RANGE OR LIST OF VALUES	0.01 and greater	0.01 and greater	0.02 and greater 0.02 is the analytical detection limit	0.03 and greater 0.03 is the analytical detection limit
DATA TYPE	numeric	numeric	numeric	numeric
MISSING DATA CODES	blank field	blank field	blank field	blank field

VARIABLES (ATTRIBUTES):                             

FILE NAME OR #ABOVE (all in which the variable appears)	all
ABBREVIATION (as it appears on the data file)	CL(MG/LITER)	SO4(MG/LITER)	PO4(MG/LITER)	PHFIELD
NAME OF VARIABLE	Chloride concentration	Sulfate ion concentration	Phosphate ion concentration	pH measured in field
DEFINITION OF VARIABLE	milligramsPerLiter	Milligrams ion per Liter	Milligrams ion per Liter	pH units
UNIT
PRECISION	0.01	0.01	0.01	0.01
RANGE OR LIST OF VALUES	0.01 and greater	0.01 and greater	0.01 and greater 0.01 is the analytical detection limit	3 to 9
DATA TYPE	numeric	numeric	numeric	numeric
MISSING DATA CODES	blank field	blank field	blank field	blank field

VARIABLES (ATTRIBUTES):             

FILE NAME OR #ABOVE (all in which the variable appears)	all
ABBREVIATION (as it appears on the data file)	PHLAB	CONDUCTFIELD	CONDUCTPPT	PPT(MM)	COMMENTS
NAME OF VARIABLE	pH measured in NADP lab	Conductivity measured in field	Conductivity measured in NADP lab	Depth of rainfall during sampling period	Notes related to concentration values
DEFINITION OF VARIABLE	pH measured in NADP lab	Conductivity measured in field	Conductivity measured in NADP lab	Depth of rainfall during sampling period	Notes related to concentration values indicating when concentration was lower than a certain value. The value does not appear under its corresponding variable.
UNIT	pH units	Microsiemens per centimeter	Microsiemens per centimeter	milliliter
PRECISION	0.01	0.1	0.1	0.01
RANGE OR LIST OF VALUES	3-9	2 or greater	2 or greater	0.01 or greater
DATA TYPE	numeric	numeric	numeric	numeric	alphanumeric
MISSING DATA CODES	blank field	blank field	blank field	blank field	blank field

COMPUTATIONAL METHODS:

Variable Name	Formula

  FOR DATA MANAGER USE ONLY

DATE OF LAST REVIEW: May 5, 2005
DATE OF LAST ENTRY: 1/23/1996
STAGE OF DATA SET MANAGEMENT (dates):
RECEIVED ENTERED:
FILED ON-LINE REVIEWED BY RESEARCHER
FILING MEDIA:
NAME OF DOCUMENTATION FILE: lterdb77.htm
NAME OF ON - LINE CATALOG: LTERDBAS
RECORD #:  77
DOCUMENT TYPE: magnetic media only
PRIORITY TO BE ENTERED: n/a

Rev. date of this form: 15 July  2001