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チューレーン大学の科学者が主導した新しい研究では、米国南東部およびメキシコ湾岸沿いの海面が過去 12 年間で急速に加速し、2010 年以降、年間約 0.5 インチという記録的な速度に達したことが明らかになりました。人為的な気候変動と自然の気候変動の複合的な影響。 加速は、メキシコ湾沿岸からノースカロライナ州のハッテラス岬、そして北大西洋とカリブ海にまで及び、亜熱帯循環地域全体に影響を与えています。 この加速は、主に風のパターンの変化と継続的な温暖化が原因であり、より暖かい水塊がより多くのスペースを必要とし、海面の上昇につながります. 率は今後数十年でより穏やかな値に戻る可能性が高いですが、研究は、脆弱な海岸線を保護するために気候変動に対処する緊急性を強調しています.

研究者は、2010 年以降、海面上昇率が年間約 0.5 インチであることを発見しました。これは、同時期の世界平均の 3 倍です。

チューレーン大学の研究では、気候変動と自然変動の影響が相まって、2010 年以降、米国南東部とメキシコ湾沿岸の海面が記録的な速さで毎年 0.5 インチ上昇していることがわかりました。 この研究は、脆弱な海岸線を保護するために気候変動に取り組む緊急性を強調しています。

チューレーン大学の科学者が主導した新しい研究によると、米国南東部および湾岸沿岸の海面は急速に加速しており、過去 12 年間で記録破りの速度に達しています。


The authors studied a combination of field and satellite measurements since 1900, pinpointing the individual contributors to the acceleration. 

“We systematically investigated the different causes, such as vertical land motion, ice-mass loss, and air pressure, but none of them could sufficiently explain the recent rate,” said Noah Hendricks, co-author and undergraduate student in Dangendorf’s team at his former institution, Old Dominion University in Norfolk, Virginia.

“Instead, we found that the acceleration is a widespread signal that extends from the coasts of the Gulf of Mexico up to Cape Hatteras in North Carolina and into the North Atlantic Ocean and Caribbean Seas, which is indicative of changes in the ocean’s density and circulation.” 

Over the past 12 years this entire area, known as the Subtropical Gyre, has been expanding primarily due to changing wind patterns and continued warming. Warmer water masses need more space and thus lead to a rise in sea level.

The scientists suggest that the recent acceleration was an unfortunate superposition of man-made climate change signals and a peak in weather-related variability that lasted over several years. They conclude that the rates will likely return to the more moderate values as predicted by climate models in the coming decades. 

“However, this is no reason to give the all clear,” said Torbjörn Törnqvist, co-author and the Vokes Geology Professor in the Department of Earth and Environmental Sciences at Tulane. “These high rates of sea-level rise have put even more stress on these vulnerable coastlines, particularly in Louisiana and Texas where the land is also sinking rapidly.” 

Dangendorf said the “results, once again, demonstrate the urgency of the climate crisis for the Gulf region. We need interdisciplinary and collaborative efforts to sustainably face these challenges.”

Reference: “Acceleration of U.S. Southeast and Gulf coast sea-level rise amplified by internal climate variability” 10 April 2023, Nature Communications.
DOI: 10.1038/s41467-023-37649-9

Also collaborating on the study were Qiang Sun from Tulane, John Klinck and Tal Ezer from Old Dominion University, Thomas Frederikse from the Jet Propulsion Laboratory in Pasadena, California , Francisco M. Calafat from the National Oceanography Centre in Liverpool, UK, and Thomas Wahl from the University of Central Florida in Orlando.


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