期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 13, 期 2, 页码 895-916出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-13-895-2013
关键词
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资金
- European Union [262254]
- EU
- NOAA Climate and Global Change Program
- Finnish Center of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate change
- German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety [FE 370343200]
- US National Science Foundation [AGS-0079486]
- CNRS-INSU
We have analysed the trends of total aerosol particle number concentrations (N) measured at long-term measurement stations involved either in the Global Atmosphere Watch (GAW) and/or EU infrastructure project ACTRIS. The sites are located in Europe, North America, Antarctica, and on Pacific Ocean islands. The majority of the sites showed clear decreasing trends both in the full-length time series, and in the intra-site comparison period of 2001-2010, especially during the winter months. Several potential driving processes for the observed trends were studied, and even though there are some similarities between N trends and air temperature changes, the most likely cause of many northern hemisphere trends was found to be decreases in the anthropogenic emissions of primary particles, SO2 or some co-emitted species. We could not find a consistent agreement between the trends of N and particle optical properties in the few stations with long time series of all of these properties. The trends of N and the proxies for cloud condensation nuclei (CCN) were generally consistent in the few European stations where the measurements were available. This work provides a useful comparison analysis for modelling studies of trends in aerosol number concentrations.
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