Clouds are Grey.
This image is of the Gulf Stream. This is a current that begins at the tip of Florida, where it is called the Florida Current, and ends off the coast of Ireland. The area off of the Northeast United States is the most interesting, dynamically speaking. Here, warm water breaks away from the stream in masses that are called eddies or rings (orange/red circular features). The Gulfstream also begins to meander, curving like a giant snake through the north Atlantic.
The Gulfstream picture shows three different types of data. The most obvious is the AVHRR satellite image of sea surface temperature (sst). In this image dark red indicates temperatures near 28 C, green colors represent temperatures near 18 Celsius and violet colors are near 10 degrees Celsius. This data is available directly to us from the satellite dish on our roof. Each pixel that makes up this image is 4x4 kilometers, but the spatial resolution of the data we get from our satellite dish is 1.1x1.1 kilometers. The satellite to the right is known as the NOAA/TIROS polar orbiting platform, and houses the AVHRR sensor.
The second type of data plotted on the Gulfstream image is from the Geosat Satellite Altimeter. This
satellite measures ocean height.
The straight white lines running southeast to northwest on the Gulfstream image are the groundtracks of the satellite passes, and the topography of the ocean is plotted perpendicular to these straight lines as curving white lines. Heights above "average" height are plotted to the right of the straight line, and heights below mean sea surface height are plotted to the left of the groundtrack. The scale of this topography is +/- 60 centimeters on either side of the groundtrack line. In other words, the drop across the Gulf Stream's northern edge, or North Wall (black line) is approximately 1.1 meters.
The third type of data is XBT data.
This is temperature data taken below the surface of the ocean by a torpedo like
instrument (right). From previous research, we know that at a depth of 200 meters,
any temperature above 15 degrees C is Gulfstream water. The yellow squares and
circles are measurements above 15 degrees, and the yellow +'s and *'s are measyurements
below this temperature at a depth of 200 meters.
These three types of data help us locate the rings and Northwall, which is important for the United States military and commercial fisherman.
We would tell you more about the Navy's concerns, but this information is top secret, and important for National Security reasons.