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Role of aqueous aerosol in the build up of large upper tropospheric moisture Anatoli Bogdan PowerPoint Presentation
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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

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slide1

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

slide2

Contents

Introduction

- 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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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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Maximum RHi of aqueous aerosol droplets which is

allowed by a water activity criterion (WAC).

slide7

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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,

Water activity may be approximated as

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Cooling

Droplets are on hydrophobic surface.

50 μm

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Cooling

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Cooling

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Cooling

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Cooling

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Cooling

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Cooling

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Cooling

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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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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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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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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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Warming