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<p>also known as wind gradient.</p>

<p><big>Characterization</big></p>
<p>Typically, due to <a href="page.php?w=aerodynamic">aerodynamic</a> <a href="page.php?w=drag_%28force%29">drag</a>, there is a wind gradient in the wind flow, especially in the first few hundred meters above the Earth's surface--the <a href="page.php?w=surface_layer">surface layer</a> of the <a href="page.php?w=planetary_boundary_layer">planetary boundary layer</a>. <a href="page.php?w=Wind_speed">Wind speed</a> increases with increasing height above the ground, starting from zero</p><p>
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