Timing of atmospheric CO2 and Antarctic temperature changes across termination III   总被引：1，自引：0，他引：1  

Caillon N  Severinghaus JP  Jouzel J  Barnola JM  Kang J  Lipenkov VY 《Science (New York, N.Y.)》2003,299(5613):1728-1731

The analysis of air bubbles from ice cores has yielded a precise record of atmospheric greenhouse gas concentrations, but the timing of changes in these gases with respect to temperature is not accurately known because of uncertainty in the gas age-ice age difference. We have measured the isotopic composition of argon in air bubbles in the Vostok core during Termination III (approximately 240,000 years before the present). This record most likely reflects the temperature and accumulation change, although the mechanism remains unclear. The sequence of events during Termination III suggests that the CO2 increase lagged Antarctic deglacial warming by 800 +/- 200 years and preceded the Northern Hemisphere deglaciation.  相似文献   

Seed drills with combined coulters in No-till technology in soil and climate zone conditions of Kazakhstan     

Mubarak Aduov  Esenali Kaspakov  Kazbek Isenov  Kadirbek Volodya  Talgat Tulegenov 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2020,70(6):525-531

ABSTRACT

Kazakhstan is one of the top ten countries in the world that use careful farming with a total area of 2 million hectares, therefore, the priority area of scientific research in the field of agriculture is the development and improvement of effective means: seed drills, tillage machines and mechanisms. As part of the research, tests were conducted with the use of experimental seed drills with various combinations of coulters: (1) double-disc and chisel coulters installed in different rows, (2) double-disc coulters and cultivator sweeps with seed distributors for band sowing. The research showed a higher efficiency of the use of combined coulters in comparison with only sweep rows in seed drills both in terms of agrotechnical indicators (yield, stubble conservation, uniformity of seed depth and field fullness germination of seeds, drag force of the drill), and from the economic effect terms. The results of this research can be used in the agricultural sector, regardless of the country and region, with careful farming using No-till technology in similar soil and climatic zones.  相似文献