Sentences with phrase «abrupt changes in the composition»
The researchers looked specifically at the average fishing revenue in 106 Alaskan communities for 10 years before and after 1989, a year when the North Pacific Ocean experienced a significant shift in productivity and abrupt changes in the composition of marine food webs, while at the same time the global price for salmon dropped because of competition from farm - raised fish.
https://www.sciencedaily.com/ Not exact matches
«Prior to this work, large, abrupt changes to forest structure and species composition were needed to induce a change in water yield we could detect,» said Caldwell.
At any rate, it seems likely to us that some major and abrupt change in the atmospheric composition and / or molecular structure is occurring at the tropopause.