Contribution of anthropogenic aerosol and greenhouse gas emissions to changes in summer upper-tropospheric thermal contrast between Asia and the North Pacific
IF 8.5 1区 地球科学Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Peilin Li, Botao Zhou, Dapeng Zhang, Wenxin Xie, Zhicong Yin, Yanyan Huang, Bo Sun, Qiaohong Sun
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引用次数: 0
Abstract
Change of zonal thermal contrast in the upper troposphere (ZTUT) between Asia and the North Pacific is a highly concerned issue, as it profoundly influences the Northern hemispheric climate. However, the physical reasons, particularly the anthropogenic influences on the ZTUT change are not well understood. Here, we show that increased aerosols and greenhouse gases tend to weaken the summer Asian-Pacific ZTUT, through affecting radiation processes over the Tibetan Plateau and altering moist enthalpy advections over the North Pacific, respectively. Under the present climate, aerosol variations play a leading role in the trend change of summer ZTUT from a deceasing to an increasing pattern in the mid-1980s. These decreasing and increasing trends are, respectively, enhanced and attenuated by greenhouse gas emissions. Toward the end of this century under the SSP2–4.5 scenario, continuous increases in greenhouse gases are expected to become the dominant contributor for projected weakening of summer ZTUT, with the rate offset by decreases in aerosols.
期刊介绍:
npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols.
The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.