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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1">
<title>Number of Active Stations Per Year</title>
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<h2>Number of Active Stations By Year</h2>
<hr class="my-4">
<p>
The following plots give the number of stations reporting the different types of
observations in a given year. This is measuring the number of stations
active in a given year and indicates how the size of the archive is changing over time.
</p>
<div class="row">
<div class="col-md-6">
<!-- <div class="thumnbail"> -->
<h4>Daily Precipitation</h4>
<a target="_blank" href="static/img/prcp_by_year.png"> <img src="static/img/prcp_by_year.png" alt="..."
class="img-thumbnail"> </a>
<!-- </div> -->
</div>
<div class="col-md-6">
<!-- <div class="thumbnail"> -->
<h4></h4>
</div>
<!-- Force next columns to break to new line at md breakpoint and up -->
<div class="w-100 d-none d-md-block"></div>
<div class="col-md-6">
<!-- <div class="thumnbail"> -->
<h4>Daily Minimum Temperature</h4>
<a target="_blank" href="static/img/tmin_by_year.png"> <img src="static/img/tmin_by_year.png" alt="..."
class="img-thumbnail"> </a>
<!-- </div> -->
</div>
<div class="col-md-6">
<!-- <div class="thumbnail"> -->
<h4>Daily Maximum Temperature</h4>
<a target="_blank" href="static/img/tmax_by_year.png"><img src="static/img/tmax_by_year.png" alt="..."
class="img-thumbnail">
<!-- </div> --></a>
</div>
<!-- Force next columns to break to new line at md breakpoint and up -->
<div class="w-100 d-none d-md-block"></div>
<div class="col-md-6">
<!-- <div class="thumbnail"> -->
<h4>Daily Snowfall</h4>
<a target="_blank" href="static/img/snow_by_year.png"><img src="static/img/snow_by_year.png" alt="..."
class="img-thumbnail">
<!-- </div> --></a>
</div>
<div class="col-md-6">
<h4>Daily Snow Depth</h4>
<a target="_blank" href="static/img/snwd_by_year.png"><img src="static/img/snwd_by_year.png" alt="..."
class="img-thumbnail"></a>
</div>
</div>
<p>Note that the plots are not given in the same scales. This was done to
show more detail for the different measurements across the continents.
</p>
<p>For each of the measurements, the largest number of stations are in North America.
We can also see the growth of stations in the
archive over time followed by an eventual decline. The timing of the decline
varies with the continent. For example, in Asia, there is an abrupt decline in
number of precipitation stations in the late 1960s (as discussed in Menne et. al. (2012)).
There is a gradual decline
in precipitation stations in the archive for Oceania beginning in the 1970s. In
South America there are two sharp declines in the number of daily precipitation stations;
the first, smaller decline occurred in the
early 1980s while the larger decline occurred in the late 1990s.</p>
<p>The following plot gives the above five plots with fixed axes.
Menne et. al. (2012) present similar plots in their paper.</p>
<p> <a target="_blank" href="static/img/test.png"><img src="static/img/test.png" alt="Element by Continent"
class="img-thumbnail" id="visualization"></a>
</p>
<p>
<cite>Menne, M.J., I. Durre, R.S. Vose, B.E. Gleason, and T.G. Houston, 2012: *An overview
of the Global Historical Climatology Network-Daily Database*. Journal of Atmospheric
and Oceanic Technology, 29, 897-910, doi:10.1175/JTECH-D-11-00103.1.</cite>
</p>
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<a href="global-addition.html"><img src="static/img/prcp_by_firstyear.png" alt="..."
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<a href="global-dropout.html"><img src="static/img/prcp_by_lastyear.png" alt="..."
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