Haze pollution in early winter(December and January) in the Yangtze River Delta(YRD) and in North China(NC)are both severe;however, their monthly variations are significantly different. In this study, the dominant lar...Haze pollution in early winter(December and January) in the Yangtze River Delta(YRD) and in North China(NC)are both severe;however, their monthly variations are significantly different. In this study, the dominant large-scale atmospheric circulations and local meteorological conditions were investigated and compared over the YRD and NC in each month. Results showed that the YRD(NC) is dominated by the so-called Scandinavia(East Atlantic/West Russia)pattern in December, and these circulations weaken in January. The East Asian December and January monsoons over the YRD and NC have negative correlations with the number of haze days. The local descending motion facilitates less removal of haze pollution over the YRD, while the local ascending motion facilitates less removal of haze pollution over NC in January, despite a weaker relationship in December. Additionally, the monthly variations of atmospheric circulations showed that adverse meteorological conditions restrict the vertical(horizontal) dispersion of haze pollution in December(January) over the YRD, while the associated local weather conditions are similar in these two months over NC.展开更多
Heatwaves wreaked havoc across the Northern Hemisphere in summer 2022 and resulted in at least 15,000 deaths in Europe.Eastern China also experienced an unprecedentedly hot and dry summer.The maximum 2-m air temperatu...Heatwaves wreaked havoc across the Northern Hemisphere in summer 2022 and resulted in at least 15,000 deaths in Europe.Eastern China also experienced an unprecedentedly hot and dry summer.The maximum 2-m air temperature(Tmax)at around 300 national meteorological stations broke the historical re-cord,and high temperature warnings sounded for 41 consecutive days.As a consequence,a devastating chain of disasters took shape.With Tmax>40℃,more than 270 million people suffered from heat stress,and there were hundreds of casualties reported due to thermoplegia.The long-lasting heatwaves and pre-cipitation deficit subsequently led to severe drought in the Yangtze River basin.Decreased runoff reduced the hydropower generation by half in Sichuan Province.展开更多
基金the National Natural Science Foundation of China[Grants No.41991283]the Research Council of Norway Funded Project BASIC[Grant No.325440]Chinese-Norwegian Collaboration Projects Within Climate funded by the Research Council of Norway(COMBINED)[Grant No.328935].
基金funded by the Major Program of the National Natural Science Foundation of China[grant number 41991283]the National Key Research and Development Program of China[grant number 2016YFA0600703]+1 种基金the Funding of the Jiangsu Innovation&Entrepreneurship Teamthe Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions。
基金supported by the National Key Research and Development Plan (Grant No. 2016YFA0600703)the National Natural Science Foundation of China (Grant Nos. 91744311, 41991283 and 41705058)the funding of the Jiangsu Innovation & Entrepreneurship Team。
文摘Haze pollution in early winter(December and January) in the Yangtze River Delta(YRD) and in North China(NC)are both severe;however, their monthly variations are significantly different. In this study, the dominant large-scale atmospheric circulations and local meteorological conditions were investigated and compared over the YRD and NC in each month. Results showed that the YRD(NC) is dominated by the so-called Scandinavia(East Atlantic/West Russia)pattern in December, and these circulations weaken in January. The East Asian December and January monsoons over the YRD and NC have negative correlations with the number of haze days. The local descending motion facilitates less removal of haze pollution over the YRD, while the local ascending motion facilitates less removal of haze pollution over NC in January, despite a weaker relationship in December. Additionally, the monthly variations of atmospheric circulations showed that adverse meteorological conditions restrict the vertical(horizontal) dispersion of haze pollution in December(January) over the YRD, while the associated local weather conditions are similar in these two months over NC.
基金supported by the National Natural Science Foundation of China[grant number 42088101]the National Postdoctoral Program for Innovative Talent of China[grant number BX2021133]the China Postdoctoral Science Foundation of No.70 General Fund[grant number 2021M701753]。
基金supported by the National Natural Science Foundation of China(nos.42088101,42025502).
文摘Heatwaves wreaked havoc across the Northern Hemisphere in summer 2022 and resulted in at least 15,000 deaths in Europe.Eastern China also experienced an unprecedentedly hot and dry summer.The maximum 2-m air temperature(Tmax)at around 300 national meteorological stations broke the historical re-cord,and high temperature warnings sounded for 41 consecutive days.As a consequence,a devastating chain of disasters took shape.With Tmax>40℃,more than 270 million people suffered from heat stress,and there were hundreds of casualties reported due to thermoplegia.The long-lasting heatwaves and pre-cipitation deficit subsequently led to severe drought in the Yangtze River basin.Decreased runoff reduced the hydropower generation by half in Sichuan Province.
