Late spring is arriving in New Zealand and plant life in the ocean all around the island nation is in full bloom. These two Sea-viewing Wide Field-of-view Sensor (SeaWiFS) views collected on December 1, 2003, show the distribution of chlorophyll-bearing phytoplankton in the surrounding ocean.
The image on the left is a quasi-natural color
view. The second view replaces the oceans
with a pseudo-color representation of chlorophyll
concentration, showing much more detail in the
ocean. Reds show very high concentrations (up to 3 milligrams per cubic meter of water) of chlorophyll, while greens show intermediate values and blues and purples show low values.
Scientists study phytoplankton concentrations in the ocean for many reasons. Not only do the microscopic marine plants provide insight into changes in the ocean’s surface, but they can absorb vast amounts of carbon dioxide out of the atmosphere during photosynthesis. Thus, these organisms play a significant role in the Earth’s climate.
[Editor’s note: Some noise introduced during transmission of the satellite signal to the ground station in Hobart is evident near the top of the high-resolution images.]