This is a straw man, Malcolm -- of course site factors affect the
radiative balance at any given location on the surface of the Earth.
That was not the the question, however. The question was (more or less)
Is there a reference to back up the contention that southwest facing
slopes generally
Mark,
I still don't think you need a reference, but using the search terms slope
aspect sun in Web of Knowledge, I was able to quickly come up with this
potentially useful reference:
Geiger, R. J. (1965) The Climate Near the Ground. Cambridge, MA: Harvard
University Press. (cited in Huang et
OK, Mark, so you COULD make it really complicated, as Martin has shown.
Given the space constraints you'll face in publishing, though, you may want
to simply add a caveat, such as in general. As for references, I don't
see the necessity. I'm not even optimistic you could find a source with any
There are many factors that could mess up this logic.
1) the season.
2) the size of the boulder.
3) The aspect of the land on which the boulder lies.
4) The lattitude.
5) The climate of the area where this boulder resides.
All of these things interact, which is why the old saying that moss grows
Mark,
Here is a reference based on empirical data for north-south-facing
slope differences:
Tajchman, S.J., M.M. Harris, and E.C. Townsend. 1988. Variability of
the radiative index of dryness in an Appalachian watershed. Agric.
For. Meteorol. 42:199-207. The study aimed to explain why
Hi Mark,
Maybe data on sun exposure and temperature differences related to tree
canopy aspect (instead of boulder aspect) may also be helpful?
Information concerning your question 1 may be found in Stoeckli et al.
(2008): Influence of Canopy Aspect and Height on Codling Moth
(Lepidoptera:
Hi folks,
I am looking for a reference which states
(1) that in the northern hemisphere the north side of boulders are
less exposed to the sun than the south side
and
(2) that the east side of boulders are exposed to the sun only in the
morning when temperatures tend to be cooler while west sides
a study on the falsification of catch data by fishermen, so my
paper made it into print.
Bill Silvert
- Original Message -
From: Mark Wilson slugecol...@gmail.com
To: ECOLOG-L@LISTSERV.UMD.EDU
Sent: sexta-feira, 13 de Agosto de 2010 17:35
Subject: [ECOLOG-L] Aspect
Hi folks,
I am
Hi, Mark,
There are some counter-intuitive issues here, and the way you have
specified the geometry does not capture the complexity of the situation.
For instance, the term side doesn't tell us much. Imagine a spherical
boulder sitting on the surface of the soil in a northerly latitude.
Why would you need a reference? That's basic physics.
Dave
On 8/13/2010 12:35 PM, Mark Wilson wrote:
Hi folks,
I am looking for a reference which states
(1) that in the northern hemisphere the north side of boulders are
less exposed to the sun than the south side
and
(2) that the east side of
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