The year 2017 marked not only the 45th anniversary of the establishment of China-Australia diplomatic relations,but also significant turbulence in the relationship.While bilateral economic and trade relations,as well ...The year 2017 marked not only the 45th anniversary of the establishment of China-Australia diplomatic relations,but also significant turbulence in the relationship.While bilateral economic and trade relations,as well as people-to-people communication and cooperation continue to grow,a series of dramatic and negative events unfolded in Australia,advocating the so-called"China threat",and instigated by anti-China sentiments.The recent anti-China backlash in Australia was caused by a combination of deep structural change in the current international system,and instability in Australia’s domestic politics.It is also the outcome of Australia’s dependence on the US-Australia alliance,while balancing between its own economic and security interests.It is worth noting that in comparison to the past,the current anti-China movement in Australia has been more profound and more focused,demonstrating new characteristics.This includes Australia collaborating with certain Western nations against China’s influence,as well as strategic warnings with more political and policy implications.Although Australia’s anti-China backlash will not have a fundamental impact on China-Australia relations,Australia’s anti-China stance and behavior is characteristic of an increasingly prevalent trend among the Western nations of concern about China’s rising influence,and new defense strategies against this.China must proceed with caution when dealing with the negative repercussions of this.展开更多
Meteorological conditions are vital to PM_(2.5)and ozone(O_(3))complex pollution.Herein,the T-mode principal com-ponent analysis method was employed to objectively classify the 925-hPa geopotential height field of Don...Meteorological conditions are vital to PM_(2.5)and ozone(O_(3))complex pollution.Herein,the T-mode principal com-ponent analysis method was employed to objectively classify the 925-hPa geopotential height field of Dongying from 2017 to 2022.Synoptic patterns associated with four pollution types-namely,PM_(2.5)-only pollution,O_(3)-only pollution,Co-occurring of PM_(2.5)and O_(3)pollution,Non-occurring of PM_(2.5)and O_(3)pollution-were characterized at different time scales.The results indicated that synoptic classes conducive to PM_(2.5)-only pollution were“high-pressure top front”,“offshore high-pressure rear”,and“high-pressure inside”,while those conducive to O_(3)-only pollution were“offshore high-pressure rear”,“subtropical high”,and“high and low systems”.The Co-occurring of PM_(2.5)and O_(3)pollution were influenced by high pressure,and the Non-occurring of PM_(2.5)and O_(3)pollution were linked to precipitation and strong northerly winds.The variation in dominant synoptic patterns is crucial in the frequency changes of the four pollution types,which was further validated through the analysis of typical cases.Under the favorable meteorological conditions of high-pressure control with strong northerly winds or a subtropical high and inverted trough both with strong precipitation,there is potential to achieve coordinated control of PM_(2.5)and O_(3)in Dongying.Additionally,measures like artificially manipulating local humidity could be adopted to alleviate pollution levels.This study reveals the importance of comprehending the meteorological factors contributing to the formation of PM_(2.5)and O_(3)complex pollution for the improvement of urban air quality in the Bohai Rim region of China when emissions are high and the concentration of air pollutants exhibits high meteorological sensitivity.展开更多
基金financial support from the Young Faculty Research Fund of Beijing Foreign Studies University(2015JT003)
文摘The year 2017 marked not only the 45th anniversary of the establishment of China-Australia diplomatic relations,but also significant turbulence in the relationship.While bilateral economic and trade relations,as well as people-to-people communication and cooperation continue to grow,a series of dramatic and negative events unfolded in Australia,advocating the so-called"China threat",and instigated by anti-China sentiments.The recent anti-China backlash in Australia was caused by a combination of deep structural change in the current international system,and instability in Australia’s domestic politics.It is also the outcome of Australia’s dependence on the US-Australia alliance,while balancing between its own economic and security interests.It is worth noting that in comparison to the past,the current anti-China movement in Australia has been more profound and more focused,demonstrating new characteristics.This includes Australia collaborating with certain Western nations against China’s influence,as well as strategic warnings with more political and policy implications.Although Australia’s anti-China backlash will not have a fundamental impact on China-Australia relations,Australia’s anti-China stance and behavior is characteristic of an increasingly prevalent trend among the Western nations of concern about China’s rising influence,and new defense strategies against this.China must proceed with caution when dealing with the negative repercussions of this.
基金jointly supported by the Ministry of Ecology and Environment of the People’s Republic of China[grant number DQGG202121]the Dongying Ecological and Environmental Bureau[grant number 2021DFKY-0779]。
文摘Meteorological conditions are vital to PM_(2.5)and ozone(O_(3))complex pollution.Herein,the T-mode principal com-ponent analysis method was employed to objectively classify the 925-hPa geopotential height field of Dongying from 2017 to 2022.Synoptic patterns associated with four pollution types-namely,PM_(2.5)-only pollution,O_(3)-only pollution,Co-occurring of PM_(2.5)and O_(3)pollution,Non-occurring of PM_(2.5)and O_(3)pollution-were characterized at different time scales.The results indicated that synoptic classes conducive to PM_(2.5)-only pollution were“high-pressure top front”,“offshore high-pressure rear”,and“high-pressure inside”,while those conducive to O_(3)-only pollution were“offshore high-pressure rear”,“subtropical high”,and“high and low systems”.The Co-occurring of PM_(2.5)and O_(3)pollution were influenced by high pressure,and the Non-occurring of PM_(2.5)and O_(3)pollution were linked to precipitation and strong northerly winds.The variation in dominant synoptic patterns is crucial in the frequency changes of the four pollution types,which was further validated through the analysis of typical cases.Under the favorable meteorological conditions of high-pressure control with strong northerly winds or a subtropical high and inverted trough both with strong precipitation,there is potential to achieve coordinated control of PM_(2.5)and O_(3)in Dongying.Additionally,measures like artificially manipulating local humidity could be adopted to alleviate pollution levels.This study reveals the importance of comprehending the meteorological factors contributing to the formation of PM_(2.5)and O_(3)complex pollution for the improvement of urban air quality in the Bohai Rim region of China when emissions are high and the concentration of air pollutants exhibits high meteorological sensitivity.
