According to foreign media reports, “Alma” swept the Caribbean after straight to Florida, “Jose” (Jose) and “Katia” (Katia) As if to be outdone. Over the past few days, the three hurricanes have been freak in the Atlantic. The strength of Elma shocked the experts, 185 miles per hour for more than 33 hours, making it the longest and most powerful hurricane ever recorded.
Looking back on the 8th, “Jose” was upgraded to a hurricane level 4, at a speed of more than 140 miles per hour, to the “Alma” footsteps to those areas that had just been hit hard. The United States “National Hurricane Center” (NHC) said Jose “extremely dangerous”, St. Barth and St. Martin issued an early warning.
Local time on September 10, hurricane “Elma” in Cuba Havana set off waves.
The third hurricane Katia landed on the evening of 8 in eastern Mexico. Katia was relegated to a tropical storm on the 9th, but the US National Hurricane Center still warned that it could bring heavy rains that could cause “flash floods, mudslides and other life-threatening” disasters, especially in the mountains. Mexico The region has just suffered the most serious earthquake since this century.
More noteworthy is that all of this happens after the hurricane “Harvey” just after two weeks. Harvey is the most powerful hurricane experienced by Texas over the past half century, causing great damage.
University of Colorado research scholar Philip Hairtz said, “At the same time we can see three more than 90 miles per hour of the Atlantic hurricane, which is recorded since the fourth.”
According to the US National Ocean And the Atmospheric Administration (NOAA), three last hurricanes in the last Atlantic were in 2010, which were Igor, Julia and Karl.
But that time Julia did not land the threat, so North America did not release her hurricane warning. This time this time is the first warning of the three hurricanes may also landed at the same time.
At present, many scientists are thinking of a problem is that so frequent, so extreme hurricane normal? Is there any special reason?
The formation of hurricanes requires warm waters, humid atmospheres and other elements. Over the past few years, many have suspected that extreme weather phenomena are associated with pollution leading to global warming, but there is a view that the increase in hurricanes may be related to the reduction of air pollution sources.
Princeton University Institute of Environmental Studies professor of geography, since the mid-1990s, the Atlantic into the “active period.” 2013 to 2016 relatively calm, 1960, 70, 80 hurricane is also rare. He argues that there is controversy over the causes of the cyclical changes in the hurricane cycle, but some argue that the dramatic increase in industrial pollution after World War II may lead to more particles blocking solar radiation and helping the ocean drop. So that the heat and humidity conditions required for hurricane formation are difficult to produce. He said: “pollution reduced hurricane activity.”
In the 1980s, due to the implementation of the Clean Air Act and other laws, pollution mitigation, direct sunlight increased, causing the sea to heat up, adding fire to the storm.
The professor of geography argues that the focus of debate among scientists is now on which hurricane changes are greater: changes in ocean currents or reduced pollution. Both of them can find evidence, but the conclusion of the data is insufficient, “we do not know how long the cycle will last, we lack the historical data.”
Pennsylvania climatologist Mike is sure that the increase in catastrophic hurricanes is no coincidence. In the past few years, the global ocean surface temperature has been the highest ever recorded, with the peak wind speed holding time to calculate the maximum intensity of the hurricane, not only in the southern hemisphere, but also in the northern hemisphere; not only in the Pacific, Now also in the Atlantic. “The impact of climate change is no longer gentle, and we are witnessing it in real time, and sadly, there have been living evidence in the past few weeks.”
He said,There is no El Niño this year. El Niño will generally increase the frequency of the Pacific storm, but will reduce the Atlantic. In addition, El Niño led to warm air flow to the surface of the atmosphere, “covered the storm of the thunder”, to prevent the hurricane with the power of Elmar.
He also believes that climate change has an impact on hurricanes. He said that the vast majority of global warming by the ocean to play. “The higher the temperature, the more the evaporation, the greater the humidity,” and “the humidity is the hurricane nutrition”, Although the meteorologist on the impact of climate warming on the formation of hurricanes There is no consensus on the frequency, but according to him, it is generally agreed that “after the temperature rises, the hurricane will be less, but the power will be greater.”
In other words, global warming does not necessarily lead to more Hurricane generation, but will increase its strength.
Another argument is that the three hurricanes at the same time to generate no fuss. “Meteorological Company Global Forecast Center” Cardenas reminded the past data and observations can not prove that the recent more powerful hurricanes are more frequent.
He said that according to the National Hurricane Center’s history, there are three active hurricanes in the (Atlantic) that are rare, but not particularly rare: about once every 15 years. In addition, we have to keep in mind that there is no way to know exactly how many hurricanes are generated in the ocean before the advent of satellite imaging technology.