464
July 2017
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
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PHOTOGRAMMETRIC ENGINEERING
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ournal
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taff
Publisher ASPRS
Editor-In-Chief Alper Yilmaz
Technical Editor Michael S. Renslow
Assistant Editor Jie Shan
Assistant Director — Publications Rae Kelley
Electronic Publications Manager/Graphic Artist Matthew Austin
Photogrammetric Engineering & Remote Sensing
is the official journal of the
American Society for Photogrammetry and Remote Sensing. It is devoted to the
exchange of ideas and information about the applications of photogrammetry,
remote sensing, and geographic information systems. The technical activities of
the Society are conducted through the following Technical Divisions: Geographic
Information Systems, Photogrammetric Applications, Lidar, Primary Data
Acquisition, Professional Practice, and Remote Sensing Applications. Additional
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PE&RS
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Most summers, jewel-toned hues appear in the Black Sea. The turquoise swirls
are not the brushstrokes of a painting; they indicate the presence of phytoplankton,
which trace the flow of water currents and eddies.
On May 29, 2017, the Moderate Resolution Imaging Spectroradiometer (MODIS) on
NASA’s Aqua satellite captured the data for this image of an ongoing phytoplankton
bloom in the Black Sea. The image is a mosaic, composed from multiple satellite
passes over the region.
Phytoplankton are floating, microscopic organisms that make their own food from
sunlight and dissolved nutrients. Here, ample water flow from rivers like the Dan-
ube and Dnieper carries nutrients to the Black Sea. In general, phytoplankton sup-
port fish, shellfish, and other marine organisms. But large, frequent blooms can lead
to eutrophication—the loss of oxygen from the water—and end up suffocating
marine life.
One type of phytoplankton commonly found in the Black Sea are coccolitho-
phores—microscopic plankton that are plated with white calcium carbonate. When
aggregated in large numbers, these reflective plates are easily visible from space
as bright, milky water.
“The May ramp-up in reflectivity in the Black Sea, with peak brightness in June,
seems consistent with results from other years,” said Norman Kuring, an ocean
scientist at NASA’s Goddard Space Flight Center. Although Kuring does not study
this region, the bloom this year is one of the brightest to catch his eye since 2012.
Other types of phytoplankton can look much different in satellite imagery. “It’s im-
portant to remember that not all phytoplankton blooms make the water brighter,”
Kuring said. “Diatoms, which also bloom in the Black Sea, tend to darken water
more than they brighten it.”
Credit: NASA image by Norman Kuring, NASA’s Ocean Biology Processing Group.
Story by Kathryn Hansen and Pola Lem.
Metadata
Data Date: May 29, 2017
Visualization Date: May 31, 2017
Sensor(s): Aqua - MODIS
To see the full image, visit
