Nitrous oxide exists at low levels in the atmosphere, yet is thought to be responsible for 6 percent of climate warming and also contributes to stratospheric ozone destruction.
The slower rate of warming in the past decade might be due to a 10 percent drop in stratospheric water.
过去十年升温的速度较慢，也许是因为同温层水降低了10%。
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These mechanisms can largely explain occurring of abnormal circulation in the stratosphere and troposphere during stratospheric sudden warming and returning then to normal regime.