DMPS measurements at Mount Waliguan, inland China

Esitys aiheesta: "DMPS measurements at Mount Waliguan, inland China"— Esityksen transkriptio:

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

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
°E 3810 m a.s.l. (Highest Global GAW) Ilmatieteen laitos / PowerPoint ohjeistus

4 Mt Waliguan surroundings
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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 ( ) 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
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8 Annual variation of Np(mode)
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9 Daily variation 1, Winter
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10 Daily variation 2, Spring
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11 Daily variation 3, Summer
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12 Daily variation 4, Fall Ilmatieteen laitos / PowerPoint ohjeistus

13 Clustering the size distributions
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14 Size distribution clusters
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15 Sectors for trajectory analysis
North Sector 4 Deserts Sector 2 China Sector 3 India / Tibet Ilmatieteen laitos / PowerPoint ohjeistus

16 Size distribution clusters from each sector (-24h)
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17 Wind roses for each cluster
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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
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20 Size distribution types seasonally
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21 Size distribution types monthly
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22 Air mass history vs wind direction
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23 Reasons for missing data
2-3 / 2006 7-8 / 2006 Ilmatieteen laitos / PowerPoint ohjeistus