Fwd: graph of data from Chumchon Banbangnod School
K Jaroensutasinee
From: David <broo...@drexel.edu>
Date: Mon, Jun 8, 2009 at 8:35 AM
Subject: graph of data from Chumchon Banbangnod School
To: Malulee Pornchockchai <mp...@ipst.ac.th>, krisa...@gmail.com,
Narong Saengkaew <ns...@ipst.ac.th>
Malulee, Krisanadej, and Narong,
Here is the graph, which I forgot to attach last time.
Malulee Pornchockchai wrote:
>
> Dear Dr.Brooks,
>
> You haven't attached me the graph!! Please send me again. I will make
> understanding about that. Thank you very much!
>
> Malulee
>
> -----Original Message-----
> From: David [mailto:broo...@drexel.edu] Sent: Sunday, June 07, 2009 12:13 AM
> To: Narong Saengkaew; Malulee Pornchockchai; Krisanadej Jaroensuthasinee
> Subject: data from Chumchon Banbangnod School
>
> Malulee,
> Here is a graph of data Malulee recently sent from Chumchon Banbangnod School. I have used the calibration constant of 4080 that Malulee sent. The diamonds on the graph are calculated solar noon "clear
>
> sky" insolation values for the longitude and latitude coordinates of this school ( 9.21465, 99.8633). As you can see, the solar noon insolation even on clear days is much smaller than the calculated "clear
>
> sky" values, and the maximum insolation values vary a lot from day to
> day.
> The most likely explanation for this difference is that there is a lot of air pollution around this school. There is also the problem of obstructions on the horizon around this school. But, the solar noon insolation values on clear days should still be much closer to the clear
>
> sky value if the atmosphere is not too polluted and if there is not too much water vapor in the atmosphere. Note that it is possible to _estimate_ the total column water vapor if the temperature and relative humidity are known. But, in any case, it is important to make sure that the calibration of this pyranometer is accurate. These data can provide a lot of information about air quality, but first we need to make sure that the measurements are reliable. It would be helpful to put a commercial pyranometer at this site for a few days, to check the calibration of this school's pyranometer.
>
>
--
David R. Brooks, PhD, President
Institute for Earth Science Research and Education
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Quality science education requires that teachers and students be
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--
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Asst.Prof.Dr. Krisanadej Jaroensutasinee
Complex System Research Unit and Crystal Research
Walailak University
Thailand
