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global-addition.html
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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 by First Year of Record</title>
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integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
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</script>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<nav class="navbar navbar-expand-md navbar-custom rounded">
<a class="navbar-brand" href="index.html">GHCN</a>
<button class="navbar-toggler custom-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample09"
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aria-haspopup="true" aria-expanded="false">Global Visualizations</a>
<div class="dropdown-menu" aria-labelledby="dropdown09">
<a class="dropdown-item" href="global-density.html">Spatial Density - Temperature</a>
<a class="dropdown-item" href="global-density-prcp.html">Spatial Density - Precipitation</a>
<a class="dropdown-item" href="global-time.html">Evolution of Network over Time</a>
<a class="dropdown-item" href="global-addition.html">Station Addition</a>
<a class="dropdown-item" href="global-dropout.html">Station Dropout</a>
<a class="dropdown-item" href="global-years.html">Years of Data</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link" href="northamerica.html">North America</a>
</li>
<li class="nav-item">
<a class="nav-link" href="sources.html">Sources</a>
</li>
<li class="nav-item">
<a class="nav-link" href="summary-data.html">Data Summaries</a>
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<div class="container">
<div class="row">
<div class="col-md-8">
<!-- <div class="jumbotron"> -->
<h2>Number of Active Stations By First Year of Record</h2>
<hr class="my-4">
<p>
The following plots give the number of stations reporting the different types of
observations in their first year. This is measuring the growth of station
data over time as stations are added to the archive.
</p>
<div class="row">
<div class="col-md-6">
<!-- <div class="thumnbail"> -->
<h4>Daily Precipitation</h4>
<a target="_blank" href="static/img/prcp_by_firstyear.png"> <img src="static/img/prcp_by_firstyear.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_firstyear.png"> <img src="static/img/tmin_by_firstyear.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_firstyear.png"><img src="static/img/tmax_by_firstyear.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_firstyear.png"><img src="static/img/snow_by_firstyear.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_firstyear.png"><img src="static/img/snwd_by_firstyear.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>
The plots contain prominent spikes which often mark the inclusion of
historical records into the GHCN archive (Menne et. al. (2012)).
For example, the large spike at 1890 for North America is the
result of the inclusion of U.S. Forts and Voluntary Observers dataset.
The large spike near 1900 for Asia is from the inclusion of a
large historical collection of observations from India.
</p>
<p>We see a rapid increase in the number of precipitation, snowfall and snow depth stations in North America
after 2000. These stations are primarily the Community Collaborative Rain, Hail and Snow Network
<a target="_blank" href="https://www.cocorahs.org">CoCoRaHS</a> of volunteer stations which began in 1998.
</p>
<p>The following plot gives the above five plots with fixed axes.</p>
<p> <a target="_blank" href="static/img/test_firstyear.png"><img src="static/img/test_firstyear.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>
<!-- </div> -->
</div>
<!--
<div class="col-md-4">
<h3>Visualizations</h3>
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<div class="col-md-6">
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<img src="Resources/assets/images/Fig2.png" alt="..." class="img-thumbnail">
</div>
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<img src="Resources/assets/images/Fig3.png" alt="..." class="img-thumbnail">
<img src="Resources/assets/images/Fig4.png" alt="..." class="img-thumbnail">
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<div class="w-100 d-none d-md-block"></div>
<div class="col-md-6">
<img src="Resources/assets/images/Fig3.png" alt="..." class="img-thumbnail">
<img src="Resources/assets/images/Fig4.png" alt="..." class="img-thumbnail">
</div>
</div>
-->
<div class="col-md-4">
<!-- <div class="jumbotron"> -->
<h3>Visualizations</h3>
<hr class="my-4">
<div class="row">
<div class="col-md-6 col-sm-3">
<!-- <div class="thumnbail"> -->
<a href="global-density.html"> <img src="static/img/tmax-2018.png" alt="..." class="img-thumbnail"> </a>
<!-- </div> -->
</div>
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<a href="global-density-prcp.html"><img src="static/img/prcp-2018.png" alt="..." class="img-thumbnail">
<!-- </div> --></a>
</div>
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<a href="global-addition.html"><img src="static/img/prcp_by_firstyear.png" alt="..."
class="img-thumbnail">
<!-- </div> --></a>
</div>
<div class="col-md-6 col-sm-3">
<a href="global-dropout.html"><img src="static/img/prcp_by_lastyear.png" alt="..."
class="img-thumbnail"></a>
</div>
</div>
<div class="row">
<div class="col-md-6 col-sm-3">
<!-- <div class="thumnbail"> -->
<a href="global-time.html"> <img src="static/img/prcp_by_year.png" alt="..." class="img-thumbnail"> </a>
<!-- </div> -->
</div>
<div class="col-md-6 col-sm-3">
<!-- <div class="thumbnail"> -->
<a href="global-years.html"><img src="static/img/prcp_years.png" alt="..." class="img-thumbnail">
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