you ever needed daily met data and found that the nearest
met station is 25km away and over a range of hills? That the
data are recorded on paper and you'll have to transcribe them
all? That they are only available for the years 1945 to 1953?
You're in good company! Almost anyone trying to run a crop
model or evaluate the probability of frost or drought knows
the feeling only too well.
it be magic to create a series of 30 years of daily rainfall,
maximum and minimum temperatures, and global radiation with
the click of a mouse for the very field that you are working
in? MarkSim can do that for you.
works from a set of interpolated climate surfaces to fit a
Markov model to the estimated climate data. It uses a third
order model with a special stochastic resampling of the model
parameters to realistically simulate the rainfall and temperature
variances for almost
anywhere in the tropics. To see how it does this, consult
output is especially tailored for users of the DSSAT
suite of crop models. The software comes with a set of background
coverages that help you find the place you're looking
for. A handy climate
display tool allows you to select the exact climate you
wish to simulate. Batch facilities allow you to simulate multiple
sites in one go.
does MarkSim look like?
screen shot show the background filled in with the coverages
of rivers, roads, towns and contours for easy location. It
is zoomed in to show the environs of CIAT, which lies between
Cali and Palmira. By merely pointing at this map, the user
can identify the point
to simulate, or alternatively view the climate. These backgrounds
cover the whole of Latin America and the Caribbean, Africa
and South East Asia. A small part of the Middle East is still
without cover but this is planned for the next release. The
Icons are explained in the User
Reference Section of the manual.
The Climate Diagram
The climate diagram shows the rainfall, maximum,
mean and minimum temperatures. This case is for CIAT. It can
display the data in polar or Cartesian coordinates and as
shown by calendar month or rotated to eliminate