Ocean acidification causes.

About 65.5 million years ago , organisms such as dinosaurs did mass extinction is , teams such as Chibakogyodai alphabetic 9 date , the research result of ocean acidification by acid rain generated by the collision of giant meteorite has been pointed out that cause I announced in the scientific journal Nature Geoscience electronic version . I have found in experiments simulating the meteorite collision .
The meteorite is of 10 km diameter collide with about 65.5 million years ago in Mexico , Yucatan Peninsula , more than half of all species on earth is extinct environment fluctuates . Such as the theory that cold reduction has occurred dust that is released in the meteorite collision block the solar radiation have been proposed , but none is best explained the extinction of the sea .
In sulfate rocks of the same components as the crater of Yucatan Peninsula , driving the metal accelerated to 15-20 kilometers per second with a laser gun , team , reproduce the meteorite impact . Result of the analysis of the gas release , and confirm that the sulfur trioxide Rainmaker acidic strong in a short period of time frequently has occurred . In addition , the state that leads to acidification of the serious marine acid rain very strong for a few days is falling , melts of shell carbonate plankton many have followed for several years has been found .
Ohno Senior Fellow of Chibakogyodai summarizing the research is the possibility that did not occur as long as the place where . Collision point which is considered the foundation of the food chain is lost in the extinction of " plankton , and led to the extinction of many organisms such as dinosaurs is different I'm talking about is " high . It is well seem to be able to explain the extinction of the sea in this forecast . What biological systems now I Will had become place if different.


約６５５０万年前、恐竜など生物が大量絶滅したのは、巨大隕石の衝突で発生した酸性雨による海洋の酸性化が原因と指摘した研究結果を、千葉工業大などのチームが９日付の英科学誌ネイチャージオサイエンス電子版に発表した。隕石衝突を模した実験で突き止めた。
　メキシコ・ユカタン半島に約６５５０万年前に直径１０キロの隕石が衝突し、環境が変動して地球上の全生物種の半分以上が絶滅したとされる。隕石衝突で放出されたちりが日射を遮り寒冷化が起きたとする説などが提唱されているが、どれも海の絶滅をうまく説明できなかった。
　チームは、ユカタン半島のクレーターと同じ成分の硫酸塩岩に、レーザー銃で秒速１５～２０キロに加速した金属を打ち込み、隕石の衝突を再現。放出ガスを分析した結果、短期間に強い酸性の雨を降らせる三酸化硫黄が多く発生したことを確認。さらに、数日間非常に強い酸性雨が降って深刻な海洋の酸性化をもたらし、多くのプランクトンが持つ炭酸塩の殻が溶ける状態が数年間続くことが判明した。
　研究をまとめた千葉工業大の大野上席研究員は「プランクトンの絶滅で食物連鎖の土台が崩れ、恐竜など多くの生物の絶滅につながったと考えられる。衝突地点が違う場所であれば起こらなかった可能性が高い」と話している。この予想で海の絶滅を上手く説明できそうですね。場所が違っていれば今の生物系はどうなっていたのでしょうかね。