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The warmer seas and drier climate caused by global warming work to the jellyfish’s advantage, since nearly all jellyfish breed better and faster in warmer waters, according to Dr. Jennifer Purcell, a jellyfish expert at the Shannon Point Marine Center of Western Washington University.

Global warming has also reduced rainfall in temperate zones, researchers say, allowing the jellyfish to better approach the beaches. Rain runoff from land would normally slightly decrease the salinity of coastal waters, “creating a natural barrier that keeps the jellies from the coast,” Dr. Gili said.

Then there is pollution, which reduces oxygen levels and visibility in coastal waters. While other fish die in or avoid waters with low oxygen levels, many jellyfish can thrive in them. And while most fish have to see to catch their food, jellyfish, which filter food passively from the water, can dine in total darkness, according to Dr. Purcell’s research.

Instead of spending weeks or months on a boat gathering data, then returning to labs to make sense of it, oceanographers say they expect to be able to order up specific requests from their desktops and download the results.

Researchers will be able, for example, to assemble a year’s worth of daily data on deep ocean temperatures in the Atlantic or track changes in currents as a hurricane nears the Gulf of Mexico. And schoolchildren accustomed to dated graphics and grainy shark videos will only have to boot up to dive deep in high definition. “It’ll all go on the Internet and in as real time as possible,” said Alexandra Isern, the program director for ocean technology at the National Science Foundation. “This is really going to transform not only the way scientists do science but also the way the public can be involved.”