Winter time always starts on the last Sunday of October.Summer time always starts on the last Sunday of March. The clock moves one (1) hour forward at 02:00.Spring Forward (+1 Hour) and Fall Back (-1 Hour).
#New york city time zone right now how to
how to know whether to move the clocks forward or backwards? Nowadays most electronic devices have automatic time zones, so the clocks change on their own depending on where you live.All EU countries who adopt the DST, start and end summer and winter time on the same dates.Some Caribbean islands have seen huge amounts of the brown algae inundate beaches during Sargassum season, posing worrisome respiratory health risks to residents exposed to the hydrogen sulfide, according to a 2018 study. The decaying algae releases ammonia and hydrogen sulfide, which has an unpleasant odor like rotten eggs and can irritate the eyes, nose and throat. Hu and other researchers in the lab have validated the accuracy of their analyses by physically collecting Sargassum in specific areas, weighing what they’ve collected and comparing it with the estimate derived from the satellite picture.Īs the Sargassum washes ashore and begins to decompose, it degrades the water quality and pollutes beaches, scientists say. The precision of satellite analysis allows the researchers to quantify the actual change in color in a specific pixel, which can then be used to calculate the amount of biomass.ĭr. The idea is simple: “If our human eyes can tell that there’s Sargassum, then the satellites can tell as well,” said Chuanmin Hu, a professor and director of the lab. For each pixel in the image, the researchers determined how much floating algae is present by comparing its color, a yellowish brown, to the blue color of the ocean. To estimate the amount of Sargassum in the ocean, researchers at the Optical Oceanography Laboratory at the University of South Florida analyzed satellite imagery from a number of sources including NASA’s Terra and Aqua satellites. Sargassum washed up on a beach in Fort Lauderdale, Fla., last month. Floating Sargassum serves as shelter and breeding grounds for fish, crabs and endangered sea turtles. The immense blooms have continued to grow almost every year, in large part because of excessive, nutrient-rich runoff from the Congo, Amazon and Mississippi rivers.Īlyson Crean, the public information officer for the City of Key West, Fla., said this year has been heavier than usual so far, though the seaweed hasn’t yet required raking more than once a day.īy law, the Sargassum can’t be harvested until it reaches the shore, because it provides crucial environmental benefits for many marine species. Mats of Sargassum, which is technically algae, have been observed for centuries, but researchers started noticing abnormally large accumulations in 2011. “I was amazed at what I saw driving along the Overseas Highway,” he said, referring to the main road that runs through the Keys. Some parts of the Florida Keys have already seen unusually large amounts of seaweed for this time of year, said Brian Lapointe, a research professor at Florida Atlantic University who has studied Sargassum for most of his career. It’s hard to predict how much will creep onto beaches in the coming months, but the right combination of ocean currents and wind conditions could push a lot of it ashore, experts said. But during the spring and summer, patches of it are carried by ocean currents toward the Caribbean, eastern Florida and elsewhere along the Gulf Coast. In the coming months, they could start emitting a rotting stench as they decay, potentially posing health risks to beachgoers.įloating mats of seaweed accumulate in the central Atlantic Ocean for much of the year. Tangles of the goopy, leafy seaweed have already begun to wash ashore beaches in southern Florida and Mexico. The legend values range from 0% to 0.5% and greater, referring to the percent of the ocean surface covered by Sargassum. Note: Sargassum density detected via satellite imagery analysis by researchers at the University of South Florida.
Source: Optical Oceanography Laboratory at the University of South Florida College of Marine Science
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