Atlantic Ocean saw above-average number of hurricanes in 2021, the third most active season since record-keeping began
Atlantic hurricane season officially ended on Tuesday and while the number of named storms did not reach the record-breaking levels of 2020, the impacts nevertheless were catastrophic.
The Atlantic Ocean still had an above-normal number of hurricanes in 2021, for the sixth year in a row. It was also the third most active season since record-keeping began in the mid-19th century.
For the seventh consecutive year, the first-named storm – called Ana – kicked up ahead of the official start to the season on 1 六月. そして 2021 is only the third time that every name on the official list allocated by the National Hurricane Center could be scratched off, ending with Tropical Storm Wanda last month.
合計で, あった 21 named storms including eight which made landfall in the United States. Four were extreme storms, two which reached Category 3 and two of Category 4.
The tail-end of August brought major devastation in the form of Hurricane Ida which made landfall near New Orleans as a Category-4, lashing the region with winds of up to 150mph (240kph), and several feet of storm surge, on the 16th anniversary of Hurricane Katrina.
慈悲深く, levees held around the Big Easy after being reinforced in the wake of 2005’s Katrina which decimated neighbourhoods and left 1,800 死んだ人. However Ida still caused massive flooding in communities like Houma and LaPlace along with widespread damage to Louisiana’s power grid. Millions of people were left in blackout as temperatures soared into triple digits.
The remnants of the hurricane then shifted up the East Coast bringing dangerous flash flooding and tornadoes from eastern Pennsylvania to New York City.
Flash flood emergencies were declared in New Jersey and New York for the first time leaving homes, businesses and the subway system submerged. 全部で, あった 96 fatalities across the US. A number of people died in the Northeast after drowning in basement apartments and in cars that were swept away.
Due to the severity of Ida, インクルード 2021 hurricane season is likely to be one of the costliest on record, reaching more than $70bn in damages. の合計 161 people died across all storms.
Scientists have long-warned that the climate crisis is fuelling more powerful and destructive storms.
The latest report from the Intergovernmental Panel on Climate Change, the world’s leading authority on 気候 理科, found that storms with sustained higher wind speeds – in the Category 3-5 range – have likely increased in the past 40 年.
While it’s still unclear whether climate change will increase the number of hurricanes, rising global temperatures will likely make the storms we do experience more powerful and more destructive. Five storms in 2021 – エルサ, グレース, 井田, Larry and Sam – saw rapid intensification, the National Oceanic and Atmospheric Administration (NOAA) 火曜日に報告.
海は吸収します 以上 90 過剰な熱のパーセント caused by greenhouse gas emissions from the burning of fossil fuels and that warm water feeds into hurricanes.
「より多くのエネルギーが利用可能です, したがって、これらのハリケーンの激化が予想されます,」スーザン・ロジャー博士, アメリカ地球物理学連合の会長であり、海洋の相互作用に関する専門家, ハリケーンと気候変動, 言った 独立者 9月中. 「そして、激化はより多くの風をもたらします。」
懸念のもう一つの原因は、惑星が熱くなるにつれて, より多くの水分が大気中に保持されます, meaning storms hold the potential of a lot more rainfall.
「ストームセンターから約150km以内, 平均降雨フラックス率は約増加すると予想されます 7 地球温暖化の摂氏1度ごとのパーセント,」トム・ナッツソン博士, NOAA地球物理流体力学研究所の上級科学者, previously told 独立者.
世界的な海面上昇は高潮の危険性を悪化させています. On the US East Coast, 例えば, the sea is rising by about one inch every three years.
Dr Astrid Caldas, a senior climate scientist at the Union of Concerned Scientists, noted in a blog post on Tuesday that Ida was just one of seven storms in the Gulf of Mexico in 2021 and highlighted 新しい研究 which found that Florida and Louisiana may now be more prone to such extreme events.
“Under a high-emissions scenario — meaning if we keep pumping unabated heat-trapping emissions in the atmosphere —the study found that most coastal regions of the US had an increasing potential for sequential landfalling tropical cyclones (tropical storms and hurricanes) 以来 1979, but that Florida and Louisiana are more likely than most regions to experience such a phenomenon,” Dr Caldas wrote.