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Aerosol Measurements at Mount Waliguan, Inland China

Explore the annual variation of aerosol size distribution, light absorption coefficient, and more at Mount Waliguan in inland China. Discover the impact of local topography and air mass patterns on aerosol characteristics.

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Aerosol Measurements at Mount Waliguan, Inland China

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  1. DMPS measurements at Mount Waliguan, inland China Niku Kivekäs NOSA 9.11.2007

  2. Thanks and acknowledgements • Finnish Meteorological Institute: • Heikki Lihavainen • Mika Komppula • Veli-Matti Kerminen • Yrjö Viisanen • Chinese Academy of Meteorological Sciences: • Jun-Ying Sun • Ming-Jin Zhan • Funding & Other: • Academy of Finland • Mount Waliguan Research Station Ilmatieteen laitos / PowerPoint ohjeistus

  3. Mt Waliguan GAW station 36.283°N 100.900°E 3810 m a.s.l. (Highest Global GAW) Ilmatieteen laitos / PowerPoint ohjeistus

  4. Mt Waliguan surroundings Ilmatieteen laitos / PowerPoint ohjeistus

  5. Climate at Mount Waliguan Annual variation of T Seasonal wind distribution Ilmatieteen laitos / PowerPoint ohjeistus

  6. Measurements at Mt Waliguan • Aerosol measurements: • Size distribution (2005-2007) • DMPS (9-600 nm) • CPC • Light absorption coefficient • Optical depth • Other measurements: • Greenhouse gases • Meteorology • Precipitation chemistry • Solar radiation • Ozone • Reactive gases Ilmatieteen laitos / PowerPoint ohjeistus

  7. Mt waliguan data coverage Ilmatieteen laitos / PowerPoint ohjeistus

  8. Annual variation of Np(mode) Ilmatieteen laitos / PowerPoint ohjeistus

  9. Daily variation 1, Winter Ilmatieteen laitos / PowerPoint ohjeistus

  10. Daily variation 2, Spring Ilmatieteen laitos / PowerPoint ohjeistus

  11. Daily variation 3, Summer Ilmatieteen laitos / PowerPoint ohjeistus

  12. Daily variation 4, Fall Ilmatieteen laitos / PowerPoint ohjeistus

  13. Clustering the size distributions Ilmatieteen laitos / PowerPoint ohjeistus

  14. Size distribution clusters Ilmatieteen laitos / PowerPoint ohjeistus

  15. Sectors for trajectory analysis Sector 1 North Sector 4 Deserts Sector 2 China Sector 3 India / Tibet Ilmatieteen laitos / PowerPoint ohjeistus

  16. Size distribution clusters from each sector (-24h) Ilmatieteen laitos / PowerPoint ohjeistus

  17. Wind roses for each cluster Ilmatieteen laitos / PowerPoint ohjeistus

  18. Conclusions • Air at Mt Waliguan has approximately 2300 particles (9-600 nm) / cm3 (at ambient pressure). • There is no clear seasonal pattern in Np. • There is a daily pattern of Np in nucleation (and partly Aitken) mode. The pattern is present at all seasons. • There is an air mass pattern in Np and the shape of the size distributions. Western air masses contain smaller particles than eastern air masses. • Local topography affects wind direction making the wind rose analysis different from trajectory analysis Ilmatieteen laitos / PowerPoint ohjeistus

  19. Thank you for your attention Ilmatieteen laitos / PowerPoint ohjeistus

  20. Size distribution types seasonally Ilmatieteen laitos / PowerPoint ohjeistus

  21. Size distribution types monthly Ilmatieteen laitos / PowerPoint ohjeistus

  22. Air mass history vs wind direction Ilmatieteen laitos / PowerPoint ohjeistus

  23. Reasons for missing data 2-3 / 2006 7-8 / 2006 Ilmatieteen laitos / PowerPoint ohjeistus

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