Status: 

Completed

Title

Maximum temperature at El Verde Field Station, Rio Grande, Puerto Rico from January 1975 to August 1992
Summary

Short name: 

LUQMetadata181

Data set ID: 

181

Abstract: 

Daily emperature has been measured at the El Verde Field Station since 1975 (see methods). Average record show that maximum values for maximum temperature recorded from May to October with a range from 29 to 30 and peaks of 29.7 Centigrade in October. The months of October through December show the most dramatic increase, specially December. Highest average maximum temperatures during these years were recorded in 1998 and 1999.

Dates
Date Range: 
1975-01-01 00:00:00 to 1992-08-31 00:00:00
People

Owner/Creator: 

Contact: 

Additional Project roles: 

Name: Douglas A. SchaeferWilliam H. McDowellJohn Bithorn Role: Associated Researcher
Methodology

Methods: 

During first period of record the El Verde Field Station was administered by the Center for Energy and Environmental Research (CEER). Since 1988 the Station has been administered by what was known then as the Terrestrial Ecology Division (TED) of the University of Puerto Rico. In 1997 TED became the Institute of Tropical Ecosystem Studies (ITES) under the Natural Science Faculty of the University of Puerto Rico at the Rio Piedras Campus. 

Background of QC procedures. Temperature data has been collected continuously at EVFS since 1975.  The early part of that record (from 1975-1992) have been filled by extrapolating from other stations or from previous data from the EVFS station.

Subsequent manipulations make the EVFS record less valuable for interpreting long term trends.  In particular, instrument problems toward the end of this early period led to changes in the thermometer and its housing (and perhaps in its location) in September 1992.  We mark this as the end of the first measurement phase and the beginning of the
second.

After September 1992, recorded maximum temperatures increased substantially at this station, certainly as a result of the instrumentation changes that took place in that month.  Noticing this, a correction was applied to the data collected after September 1992 to make it comparable to the data collected previously.  The exact nature of this correction is not described in the metadata or temperature logs. This correction ceased to be applied to these maximum temperature data in 1997, and as a result, the EVFS maximum temperature record (LUQ data set 16) showed an abrupt increase in maximum temperature in 1997.

This partially corrected data set is the one we made accessible to people on our web site and through ClimDB until Feb 2014. At least one paper has reached erroneous conclusions about long term trends based on these data (Huey et al. 2009).

We are now (since March 26, 2014) treating the January 1975-August 1992 data and the October 1992-present uncorrected data as two different data sets. The differences in instrumentation have introduced differences in the data between these two periods, and treating them as a single data set misrepresents the data.  Moreover, the extensive extrapolation of data in the earlier data set makes them suspect, and combining the two data sets pollutes the later record.

Additional information: 

ADJUSTED DATA

DAILY MAXIMUM TEMPERATURE AT EL VERDE, 1975 to 1989
1. FROM JAN 1975 THROUGH APRIL 1978 RECORDED AX T DATA APPEARED TO BE TOO HIGH. THEY WERE SUBSTITUTED WITH LONG-TERM AVG MAX T.(*)
2. RECORDS ARE MISSING FROM OCT AND NOV 1978. LONG-TERM AVG MAX T WERE SUBSTITUTED FOR THOSE MONTHS.
3. RECORDS ARE TOO LOW FOR THE PERIOD OCT 1987 THROUGH AUG 1992. FROM OCT 1987 THROUGH OCT 1989 DATA WERE SUBSTITUTED WITH LONG-TERM AVG MAX T (*). RECORDS FROM NOV 1989 THROUGH AUG 1992 WERE SUBSTITUTED WITH ADUSTED EV MET STATION MEASUREMENTS.
4. THERE ARE NO EV MET STATION DATA FOR THE MONTH OF JAN 1992. THEY WERE SUBSTITUTED WITH LONG-TERM AVG MAX T (*).
5.  Data (1988-1992) was read as current not max. Adjustments  were done based on daily max data from other stations (Pico del Este and Fajardo) (*) Long-term avg Max T WHERE CALCULATED USING THE DATA FROM JAN 1979 to DEC 1986.

DAILY MAXIMUM TEMPERATURE AT EL VERDE, 1990 to 1999
1. RECORDS ARE TOO LOW FOR THE PERIOD OCT 1987 THROUGH AUG 1992. FROM OCT 1987 THROUGH OCT 1989 DATA WERE SUBSTITUTED WITH LONG-TERM AVG MAX T (*). RECORDS FROM NOV 1989 THROUGH AUG 1992 WERE SUBSTITUTED WITH ADUSTED EV MET STATION MEASUREMENTS.
2. THERE ARE NO EV MET STATION DATA FOR THE MONTH OF JAN 1992. THEY WERE SUBSTITUTED WITH LONG-TERM AVG MAX T (*).
3. Data (1988-1992) was read as current not max. Adjustments  were done based on daily max data from other stations (Pico del Este and Fajardo)
4. FROM SEP 1992 THROUGH APRI 1997 RECORDED MAX T DATA APPEARED TO BE TOO HIGH. THEY WERE SUBSTITUTED WITH ADJUSTED EV MET STATION DATA.
5. In September 19, 1992, the thermomether for reading Maximum Temperature in Fahrenheit was replaced for a new one.

CLIMDB DATA

The data from this data set is harvested by the LTER ClimDB (http://climhy.lternet.edu/harvest.pl.) and available to the public at: http://climhy.lternet.edu/. See the location for the LUQ ClimDB El Verde site data in this website at: http://luq.lternet.edu/datamng/nis/luqclimdb.txt

Status: 

Completed

Time Period: 

Long-Term