Open-cell and closed-cell clouds off California, Pacific Ocean - related image preview

1000 x 750
208 KB - JPEG

Open-cell and closed-cell clouds off California, Pacific Ocean - related image preview

2000 x 1500
659 KB - JPEG

Open-cell and closed-cell clouds off California, Pacific Ocean - related image preview

4000 x 3000
2 MB - JPEG

Open-cell and closed-cell clouds off California, Pacific Ocean

This true-color Moderate Resolution Imaging Spectroradiometer (MODIS) image from August 16, 2002, was captured off the coast of California over the Pacific Ocean. The image features both open- and closed-cell cumulus cloud patterns. These cells, or parcels of air, often occur in roughly hexagonal arrays in a layer of fluid (the atmosphere often behaves like a fluid) that begins to convect, due to heating at the base or cooling at the top of the layer.

In closed cells, like those around the perimeter, warm air is rising in the center, and sinking around the edges, so clouds appear in cell centers, but evaporate around cell edges. The reverse flow can also occur: air can sink in the center of the cell and rise at the edge. This process is called open-cell convection, and clouds form at cell edges around open centers, creates a lacy, hollow-looking pattern like the clouds in the center of the image.


Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC

Published September 15, 2002
Data acquired August 16 - 16, 2002

Source:
Terra > MODIS
Collection:
Visible Earth