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:

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

DATA SET IDENTIFIER: Meteorological data at El Verde Field Station:  Roof station

PROJECT TITLE: Meteorological data at El Verde Field Station:  Roof station

PROJECT DESCRIPTION:Rainfall and temperature have been measured at the El Verde Station since 1964, twenty two years previous to LUQ LTER 1. In McDowell and Estrada-Pinto ⁽¹⁾, the collection procedures, the daily raw precipitation data from 1964 to 1986, and some summary statistics of the precipitation data covered on that period of time were reported. Meteorological sensors were installed at the El Verde Field Station's flat concrete rooftop, 3 m above the ground surface at an elevation of 350 m asl after the September 1989 (Hugo) hurricane. Since 1995, rainfall and temperature data since 1975 and sensors data since 1990 from the above records are being published on the LUQ LTER Web site. Begining in 2003, Ramírez and Meléndez-Colom report a summary of the data from these data set online. The latter is a downloadable pdf file that can be found at: http://ites.upr.edu/EVFS/MeteorSummary2004.pdf

(1) William H. McDowell and Alejo Estrada-Pinto.1988. Rainfall at El Verde Station, 1964-1986. Center for Energy and Environmenta Research (CEER), Technical Report No. CEER T-228.

LTER CORE AREAS: (Annotate all that apply)

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):

Data File No.	Data File Identifier	On-Line Filename	Starting Date	Periodicity of sample	End Period
	Summary of the available every 15 minutes data files.	Table 1	January 1990	Every 15 minutes	December 1991
	Summary of the available hourly data files.	Table 2	June 10, 1995	Every 60 minutes	December 12, 2000
1	Summary of the available daily data files	EVFSMetdailyDataAllYears.txt	January 1995	Every 24 hours	December 2000

RESEARCH LOCATION: The meteorological sensors were installed 2 to 3 m above the flat concrete roof of the laboratory building at El Verde Field Station.

INVESTIGATORS:

Alonso Ram&icute;rez

aramirez@www.ites.upr.edu

OTHER RESEARCHERS E-MAIL address

Jill Thompson	jill@coqui.net
Douglas Schaefer	DSchaef53@hotmail.com
William Lawrence

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

Alonso Ram&icute;rez

aramirez@www.ites.upr.edu

(787)380-3220

SOURCE OF FUNDING (SPONSOR): NSF-LTER

DATA SET ABSTRACT: The meteorological sensors were installed above the flat concrete roof of El Verde Field Station (elevation: 350 m asl). The building is in an approx. 0.3 ha clearing in a forest approx. 20 m tall. Data were processed and temporarily stored in a Campbell 21X data logger on-site. The station was initiated after the September 1989 hurricane. As this station was installed 3 meters above a concrete rooftop in a forest clearing, dry air temperatures during daylight hours are higher than those that would be measured in the adjacent forest. The USGS maintains a nearby (100 m away) station on a 20 m tower (since 1992). An additional station for temperature and humidity measurements in the forest understory was added in 1997. Additional measurements of daily rainfall and maximum and minimum air temperatures for this site since 1975 exist on separate files.

DATA SET METHODS: Provided under individual variable descriptions. (See Variables)

REFERENCES:

CROSS REFERENCE: LTERDBAS 14: Rainfall at El Verde since 1975; LTERDBAS 16: Maximum temperature at El Verde since 1975 ; LTERDBAS 17: Minimum temperature at El Verde since 1975; LTERDB 33: Metereological data from towers (pre-Hugo) or rooftop (post-Hugo) at El Verde

SAMPLE LOCATION: ITES, Data Mngr.'s Cabinet DM333-01, Drawer #1

STORAGE SITES: N/A

INVESTIGATOR'S ASSIGNED KEYWORDS: weather, climate, meteorology, meterological monitoring, modeling, rainfall, maximum temperature, minimum temperature, relative humidity, solar radiation, wind vector, wind rose

LEF LTER OFFICIAL KEYWORDS (See table): EL VERDE, TABONUCO, CLIMATE, RAINFALL

PUBLICATIONS:

DISSEMINATION: UNRESTRICTE

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: The meteorological sensors are installed 3 m above a flat concrete rooftop (El Verde Field Station) 3 m above the ground surface at an elevation of 350 m asl. The building is in an approx. 0.3 ha clearing in a forest approx. 20 m tall. Data is processed and temporarily stored in a Campbell 21X data logger on-site.

Geographical positional system (GPS) Coordinates for each location:

location	latitude	longitude
El Verde Field Station Lab (roof)	18° 19' 22" N	65° 49' 13" W

Disclaimer: *The following measurements are not reliable: TotalSolRad(watts/m2), TotalPPFD(mmol/cm2sec)

VARIABLES (ATTRIBUTES): YearJulian Hour Mean

VARIABLES (ATTRIBUTES):

FILE NAME OR #ABOVE (all in which the variable appears)
ABBREVIATION (as it appears on the data file)	WinSpeed(m/sec)	MeanWinDir(degrees)	SigTheta	WinRose#-#(degrees)
NAME OF VARIABLE	Wind speed	Wind direction	Sigma theta	Wind rose
DEFINITION OF VARIABLE	Wind speed as measured by a rotating cup anemometer.	Wind direction as measured by a freely rotating wind vane oriented relative to geographic north.	Sigma theta is the standard deviation of the wind vector during the measurement interval. It is a measure of turbulence in the wind field and is used in atmospheric deposition models as a measure of the intrusion of turbulent eddied into the plant canopy	Wind rose as determined by the anemometer and wind vane. It is the fraction of the total wind vector during the measurement interval in each of the eight compass octants (WinRose1-45(degrees) = NE-E, WinRose46-90(degrees) = N-NE, WinRose91-135(degrees) = NW-N, WinRose136-180(degrees) = W-NW, WinRose181-225(degrees) = SW-W, WinRose226-270(degrees) = S-SW, WinRose271-315(degrees) = SE-S, WinRose316-360(degrees) = E-SE). The sum of all eight values equals the wind speed during the measurement interval.
UNIT	m/sec	degrees	degres	m/sec
PRECISION	0.1 m/s	1 degree	0.1	0.0001
RANGE OR LIST OF VALUES	0 - 30 m/s	0 - 359 degrees	0 - 100 degrees	0 - 30 m/s
DATA TYPE	numeric	numeric	numeric	numeric
MISSING DATA CODES	blank cell or -99999	blank cell or -99999	blank cell or -99999	blank cell or -99999

VARIABLES (ATTRIBUTES):

COMPUTATIONAL METHODS:

Variable Name	Formula
Temperatures	averaged over a period of 15, 30, or 60 minutes, which can be determined from the data file
Rain	summed for a period of 15, 30, or 60 minutes, which can be determined from the data file
Humidity	averaged over a period of 15, 30, or 60 minutes, which can be determined from the data file
Wind speed	averaged over a period of 15, 30, or 60 minutes, which can be determined from the data file
Wind direction	averaged over a period of 15, 30, or 60 minutes, which can be determined from the data file
Wind vectors (speed and direction)	summed in eight bins for the measurement interval
Standard deviation	calculated from the wind vectors measured approx. Every 10 sec during the sampling interval

Observations:  

DATE OF LAST REVIEW: May 5, 2005
DATE OF LAST ENTRY: June 6, 1996
STAGE OF DATA SET MANAGEMENT (dates):
RECEIVED peridically since Sep 1989
ENTERED:
FILED 1989