| Title: |
Bonanza Creek Experimental Forest: PYR measurements: hourly (1988 - Present)
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| Contacts: |
Charlton, Brian
Hollingsworth, Jamie
Yarie, John
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| Abstract: |
The pyranometers measure the energy flux density of global sun plus sky radiation across a broad band from 280 to 2800 nm. The sensor consists of a silicon photodiode which does not have an equal spectral response across the band. However, this does not cause serious error for measurements of solar radiation, provided the spectral distribution is not altered, such as within plant canopies. In 1993, Eppley total UV radiometers (TUVR) were installed at each climate station on 21 April at LTER1 and 5 May at LTER2. These radiometers consist of a Weston selenium barrier-layer photoelectric cell with a sealed-in quartz window, a bandpass filter to restrict the wavelength response of the photcell to the designed range (295-385 nm), and a diffusing disc of Virgin Teflon to reduce the light intensity at the filtered photocell and also to improve the adherence of the instrument to the Lambert cosine law. The disc is nearly uniform diffusing over the wavelength range of interest, as well as geometrically within the system. The terminals of the photocell are connected through a precision resistor and the signal measured as a voltage drop across the resistor. Global solar radiation and UV are summarized by converting hourly W/sq m (J/sq m/s) to hourly MJ/sq m/hr and summing over 24 hours to determine daily global radiation in MJ/sq m/day. Similarly, photosynthetically active radiation was converted to hourly E/sq m/hr and summed over 24 hours to determine the daily PAR in E/sq m/day. UV radiation is measured only during the snow free period, and winter measurements of global radiation and PAR may be inaccurate due to snow cover.
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| Keywords: |
PYR, |
| Categories: |
Climate
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| Study Period: |
Jun 1, 1988 to Aug 8, 2008
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| Bounding Box: |
West longitude: -148.31389°
North latitude: 64.74167°
East longitude: -148.2482407°
South latitude: 64.69779026°
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| Site References: |
LTER1 -- 100 (LTER1) is the Bonanza Creek Experimental Forest's primary upland weather station. More intensive climate data is collected at this station than the other upland stations.
LTER2 -- LTER2, the second Bonanza Creek Experimental Forest full weather station, was established to monitor the climate of the floodplain region of BCEF.
This site is located adjacent to the Tanana River in BCEF.
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| Data Columns: |
| Column |
Name |
Units |
Type |
| 1 |
site |
|
string |
| 2 |
date |
yyyy-mm-dd |
Datetime |
| 3 |
hour |
hhhh |
Datetime |
| 4 |
measurment |
|
string |
| 5 |
value |
MJm-2 |
float |
| 6 |
unit |
|
string |
| 7 |
flag |
|
string |
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| Data File(s): |
bcef_pyr.txt
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| Supplemental Files: |
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| Metadata Formats: |
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| Public Release: |
Nov 5, 2005
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| Publications: |
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The Bonanza Creek LTER, including this website, is supported by the
National Science Foundation through awards
DEB-0620579,
DEB-0423442,
DEB-0080609,
DEB-9810217,
DEB-9211769,
DEB-8702629
and by the USDA Forest Service, Pacific Northwest Research Station through agreement number RJVA-PNW-01-JV-11261952-231.
Any opinions, findings, conclusions, or recommendations expressed in the
material are those of the author(s) and do not necessarily reflect
the views of the supporting agencies or the program as a whole.
© Bonanza Creek LTER, 2009.
Last modified 23-Nov-09
UAF is an affirmative action/equal opportunity employer and educational institution.
This site is a member of the LTER Network.
Disclaimer
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