role of aqueous aerosol in the build up of large upper tropospheric moisture anatoli bogdan
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Role of aqueous aerosol in the build up of large upper tropospheric moisture Anatoli Bogdan Institute of Physical Chemistry, University of Innsbruck Austria and Department of Physics, University of Helsinki Finland. Contents Introduction - PowerPoint PPT PresentationTRANSCRIPT
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Role of aqueous aerosol in the build up of large upper tropospheric moisture
Anatoli Bogdan
Institute of Physical Chemistry, University of Innsbruck Austria
andDepartment of Physics, University of Helsinki
Finland
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ContentsIntroduction - observational data of UT moisture - water activity criterion
Approaches for explanation of large UT moisture - cubic ice hypothesis - organic coating around sulfuric acid aerosol - glassy organic (citric acid) aerosol - mixed-phase cirrus cloud particles
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Observations of UT moisture
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The warming is large at the upper troposphere in the tropics and the lower troposphere in the northern high latitude. http://www.mri-jma.go.jp/Dep/cl/cl4/yosoku/yosoku-en.htm
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Water activity criterion
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Maximum RHi of aqueous aerosol droplets which is allowed by a water activity criterion (WAC).
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Equilibrium partial pressures of the components of ideal and non-ideal binary solution as a function of the mole fraction XA. When XA → 1, we have a dilute solution of B in A. In this region the Raoult’s law pA = XA p*A is applied for A. In the region where XA → 0, we have the Raoult’s law pB = XB p*B for B component.
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,
solw
w
pa
pWater activity may be approximated as
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Cubic ice hypothesis
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Hexagonal ice
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The arrangement of water molecules in hexagonal ice
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Cubic ice
Hexagonal ice lattice
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Diffraction patterns from frozen emulsified droplets of 30 wt % HNO3.
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Ratio of vapor pressure of cubic and hexagonal ices
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The hypotheses of organic coating around sulfuric acid aerosol
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Organic coating of sulfuric acid aerosol
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The hypotheses of concentrated glassy citric acid aerosol
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Calorimetric thermograms of emulsified 17 wt% H2SO4 and 17/3 wt% H2SO4/HNO3.
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Complete and truncated thermograms of 20wt% H2SO4.
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16 Cooling
Droplets are on hydrophobic surface.
50 μm
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17Cooling
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18Cooling
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19 Cooling
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20Cooling
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21Cooling
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22Cooling
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23Cooling
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39
Warming
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Warming
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Warming
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Warming
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Warming
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