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DMPS measurements at Mount Waliguan, inland China

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

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DMPS 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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