Site Meteorological Measurements

REFERENCE STAND #13 (RS13__)

Site description: Midslope, Wildcat Mtn RNA; Habitat type Abpr/Clun

Latitude: 44-20-38 Longitude: 122- 7-24 Elevation (MSL): 1350 meters

Aspect: 270 degrees Slope: 20 degrees

( * = measurement discontinued at this site )

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AIR TEMPERATURE (RS13__)

Measurement period:: 19710814 - 20031112

Comments:

Daily Variables:
14 Aug 1971 to 31 Dec 1972:
Mean, max, min sunrise to sunrise temperature
Mean daytime, mean nighttime temperature
31 Dec 1972 to 19 Jan 1981:
Mean sunrise to sunrise temperature
Mean, max daytime temperature
Mean, min nighttime temperature
19 Jan 1981 to 10 Feb 1987:
Mean, max, min sunrise to sunrise temperature
Mean daytime, mean nighttime temperature
10 Feb 1987 to 11 May 1998:
Mean, max, min daily (midnight to midnight) temperature
Mean, max, min daytime temperature
Mean, max, min nighttime temperature
Time of max, time of min for daily, daytime, nighttime
11 May 1998 to 11 Nov 2003:
Mean, max, min daily (midnight to midnight) air temperature
Daily time of max, time of min

Fine Resolution Variables:
11 May 1998 to 12 Nov 2003:
Mean hourly air temperature

Sensor height: 100 cm in summer, 300 cm in winter (approx. Oct-Apr)
400 cm (permanently located on 26 Aug 1987)
275 cm (repositioned 01 Oct 1991)

Notes: Before 31 Dec 1972, daytime length was determined for the 15th of the
month, and used for the entire month. After this time, an algorithm
was developed to determine daily day length. Changes in measured
temperature parameters were due to changes in the digitizing program
used to process chart data. All daily summaries are based on a
sunrise to sunrise day before 10 Feb 1987.
Beginning 10 Feb 1987, a true daily summary is available due to the use
of a revised digitizing program. The revised program produces output
similar to the CR10 dataloggers used for thermographs.
Beginning 26 Aug 1987, variables are measured in a nearby open canopy site,
as well as the closed canopy site.
On 26 Aug 1987, a CR10 datalogger is installed. The Partlow chart
recorder was maintained until 11 Jun 1990 as a backup, and then removed.
Daytime/nighttime calculation discontinued 11 May 1998.

PROBE 01:

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SOIL TEMPERATURE (RS13__)

Measurement period:: 19710814 - 20031112

Comments:

Daily Variables:
14 Aug 1971 to 10 Feb 1987:
Mean sunrise to sunrise temperature only
10 Feb1987 to 11 May 1998:
Mean, max, min daily (midnight to midnight) temperature
Mean, max, min daytime temperature
Mean, max, min nighttime temperature
Time of max, time of min for daily, daytime, nighttime
11 May 1998 to 11 Nov 2003:
Mean, max, min daily (midnight to midnight) soil temperature
Daily time of max, time of min

Fine Resolution Variables:
11 May 1998 to 12 Nov 2003:
Mean six-hourly soil temperature

Sensor depth: 20 cm

Notes: Soil temperature was digitized on a sunrise to sunrise basis.
After 10 Feb 1987, a true daily summary is available due to the use
of a revised digitizing program. The revised program produces
output similar to the CR10 dataloggers used for thermographs.
On 26 Aug 1987, a CR10 datalogger is installed, and an additional
adjacent open canopy site is established. The Partlow chart
recorder was maintained until 11 Jun 1990 as a backup in the
closed canopy site, and then removed.

PROBE 02: