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| 1 | Continuous and comprehensive atmospheric observations in Beijing:a station to understand the complex urban atmospheric environment显示文摘Due to profound impact on climate and human health,air quality has attracted attention from all levels of the civil society.The key step in the provision of required tools for the society to tackle the complex air quality problem is to characterize it in a comprehensive manner with a long-term perspective.Here,we describe a continuous and comprehensive observation station and its accompanying state-ofthe-art instrumentation that was established to investigate the complex urban atmospheric environment in a rapidly developing Chinese Megacity.The station,located in downtown Beijing,aims to study air quality by identifying the major atmospheric pollutants and key processes determining their formation and loss mechanisms.A few hundreds of parameters are continuously measured with the state-of-the-art instruments,including trace gas concentrations,aerosol particle size distributions,and mass concentrations,covering aerosol particle chemical composition from molecules to micrometer-sized aerosol particles.This produced long-term,comprehensive big data with around 1�10^(11)bytes per year.In this paper,we provide an overview on the facilities of the station,the instrumentation used,the workflow of continuous observations and examples of results from 2018 to 2019 and a basis for establishing a modern long-term,comprehensive atmospheric urban observation station in other megacities. | Yongchun Liu Chao Yan Zemin Feng Feixue Zheng Xiaolong Fan Yusheng Zhang Chang Li Ying Zhou Zhuohui Lin Yishou Guo Ying Zhang Li Ma Wenshuo Zhou Zhikun Liu Lubna Dada Kaspar Dallenbach Jenni Kontkanen Runlong Cai Tommy Chan Biwu Chu Wei Du Lei Yao Yonghong Wang Jing Cai Juha Kangasluoma Tom Kokkonen Joni Kujansuu Anton Rusanen Chenjuan Deng Yueyun Fu Rujing Yin Xiaoxiao Li Yiqun Lu Yiliang Liu Chaofan Lian Dongsen Yang Weigang Wang Maofa Ge Yuesi Wang Douglas R.Worsnop Heikki Junninen Hong He Veli-Matti Kerminen Jun Zheng Lin Wang Jingkun Jiang Tuukka Petaja Federico Bianchi Markku Kulmala | 2020 | Big Earth Data2020，4，3： | 3 |
| 2 | Plasmapheresis treatment in Guillain-Barré syndrome:potential benefit over IVIg in patients with axonal involvement显示文摘 | Dada MA Kaplan AA | | 0，，05： | 1 |
| 3 | Fatal firearm wounds:a clinicopathologic study显示文摘 | Bhana BD Kirk GM Dada MA | | 0，，03： | 1 |
| 4 | Membranous fat necrosis due to subcutaneous elemental mercury injections 显示文摘 | Ramdial PK Jogessar V Dada MA | 1999 | Am J Forensic Med Pathol1999，20，4： | 1 |
| 5 | Cerebral infarction and intracranial arterial dissection in closed head injury显示文摘 | Rutherfgord GS Dada MA Ne] JP | 1996 | Am J Forensic Med Pathol1996，17，1： | 1 |
| 6 | Lymphoproliferative disorders in Oxford renal transplant recipients显示文摘 | Bates WD Gray DW Dada MA | 2003 | J Clin Pathol2003，56，： | 1 |
| 7 | Plasmapheresis treatment in Guillain-Barre syndrome:potential benefit over IVIg in patients with axonal involvement显示文摘 | Dada MA Kaplan AA | 2004 | Ther Apher Dial2004，8，5： | 1 |
| 8 | Plasmapheresis treatment in Guillaln- Barre syndrome:potential benefit over IVIg in patients with ax- onal involvement 显示文摘 | Dada MA Kaplan AA | 2004 | Ther Apher Dial2004，8，5： | 1 |
| 9 | Cerebral infarction and intracranial arterial dissection in closed head injury 显示文摘 | Rutherfoorod GS Dada MA Nel JP | 1996 | Am J Forensic Med Pathol1996，17，1： | 1 |
| 10 | Plasmapheresis treatment in GuillainBarré syndrome:potential benefit over ⅣIg in patients with axonal involvement显示文摘 | Dada MA Kaplan AA | 2004 | Ther Apher Dial2004，8，5： | 1 |
| 11 | Cerebral infarction and intracranial arterial dissection in closed head injury显示文摘 | Rutherfoord GS Dada MA Nel JP | 1996 | An J Forensic Med Pathol1996，17，1： | 1 |
| 12 | Plasmapheresis treatment in GuillainBarre syndrome:potential benefit over IVIg in patients with axonal involvement显示文摘 | Dada MA Kaplan AA | 2004 | Ther Apher Dial2004，8，5： | 1 |
| 13 | Focal nodular hyperplasia of the liver coexisting with an adrenal pseudocyst 显示文摘 | Chetty R Dada MA | 1998 | S Afr J Surg1998，36，3： | 1 |
| 14 | Lymphoproliferative disorders in Oxford renal transplant recipients显示文摘 | Bates WD Gray DW Dada MA | 2003 | J Clin Pathol2003，56，6： | 1 |
| 15 | Mechanical airway obstruction caused by accidental aspiration of a ballpoint pen显示文摘 | Bhana BD Gunaselvam JG Dada MA | 2000 | Lippincott Wilkins Inc2000，21，4： | 1 |
| 16 | Plasmapheresis treatment in Guillain-Barre syndrome:potential benefit over IVIg in patients with axonal involvement显示文摘 | Dada MA Kaplan AA | 2004 | Ther Apher Dial2004，8，5： | 1 |
| 17 | The missing base molecules in atmospheric acid–base nucleation显示文摘Transformation of low-volatility gaseous precursors to new particles affects aerosol number concentration,cloud formation and hence the climate.The clustering of acid and base molecules is a major mechanism driving fast nucleation and initial growth of new particles in the atmosphere.However,the acid–base cluster composition,measured using state-of-the-art mass spectrometers,cannot explain the measured high formation rate of new particles.Here we present strong evidence for the existence of base molecules such as amines in the smallest atmospheric sulfuric acid clusters prior to their detection by mass spectrometers.We demonstrate that forming(H_(2)SO_(4))1(amine)1 is the rate-limiting step in atmospheric H_(2)SO_(4)-amine nucleation and the uptake of(H_(2)SO_(4))1(amine)1 is a major pathway for the initial growth of H_(2)SO_(4)clusters.The proposed mechanism is very consistent with measured new particle formation in urban Beijing,in which dimethylamine is the key base for H_(2)SO_(4)nucleation while other bases such as ammonia may contribute to the growth of larger clusters.Our findings further underline the fact that strong amines,even at low concentrations and when undetected in the smallest clusters,can be crucial to particle formation in the planetary boundary layer. | Runlong Cai Rujing Yin Chao Yan Dongsen Yang Chenjuan Deng Lubna Dada Juha Kangasluoma Jenni Kontkanen Roope Halonen Yan Ma Xiuhui Zhang Pauli Paasonen Tuukka Petaja Veli-Matti Kerminen Yongchun Liu Federico Bianchi Jun Zheng Lin Wang Jiming Hao James N.Smith Neil M.Donahue Markku Kulmala Douglas R.Worsnop Jingkun Jiang | 2022 | National Science Review2022，9，10： | 0 |
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