Atmospheric Gravity Waves ripple the surface of the ocean and shape the clouds over New Zealand and off its shores in this <a href="http://modis.gsfc.nasa.gov" target="outlink">Moderate Resolution Imaging Spectroradiometer</a> (MODIS) image captured by the <a href="http://aqua.nasa.gov/" target="outlink"> Aqua</a> satellite on November 7, 2003. Also called Atmospheric Internal Waves, Atmospheric Gravity Waves occur when a uniform layer of air blows over a mountain or an island. Before encountering the obstacle, the atmosphere must be stratified.each layer must have a uniform temperature and density, which only changes with height. When the air runs over the obstacle, in this case, New Zealand, the horizontal ribbons of uniform air are disturbed and a wave forms. The disturbance impresses its pattern on sea waves when it touches the surface of the ocean. In the air, Atmospheric Gravity Waves are manifest in <a href=" http://visibleearth.nasa.gov/cgi-bin/viewrecord?25910" target="outlink">wave clouds</a>. Notice how both the clouds and the waves in this image have taken on the same pattern. Sensor: Aqua/MODIS. Data Start Date: 11/7/03. Data End Date: 11/7/03.