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The role of ammoniated aerosols in cirrus cloud nucleation
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| Zeitschriftentitel: | Geophysical Research Letters |
|---|---|
| Personen und Körperschaften: | , |
| In: | Geophysical Research Letters, 25, 1998, 9, S. 1379-1382 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Tabazadeh, Azadeh Toon, Owen B. Tabazadeh, Azadeh Toon, Owen B. |
|---|---|
| author |
Tabazadeh, Azadeh Toon, Owen B. |
| spellingShingle |
Tabazadeh, Azadeh Toon, Owen B. Geophysical Research Letters The role of ammoniated aerosols in cirrus cloud nucleation General Earth and Planetary Sciences Geophysics |
| author_sort |
tabazadeh, azadeh |
| spelling |
Tabazadeh, Azadeh Toon, Owen B. 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/97gl03585 <jats:p>Recent results obtained during the SUCCESS experiment show that aerosols containing ammonium ion are commonly found in the upper troposphere and therefore it is of great importance to investigate the ice freezing properties of such aerosols. For this purpose we present mathematical expressions, derived from recent model calculations and laboratory data, for calculating the deliquescence relative humidity of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>, NH<jats:sub>4</jats:sub>HSO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> under upper tropospheric conditions. Using these functions we define the temperature and relative humidity requirements for the deliquescence of dry particles in the upper troposphere. Further using a thermodynamic model of the H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>/HNO<jats:sub>3</jats:sub>/NH<jats:sub>3</jats:sub>/ H<jats:sub>2</jats:sub>O system, we calculate the variation in the supercooled aerosol composition and saturation ratios of various ionic salts in solution as a function of temperature and relative humidity. Using these values we show salt crystallization in the upper troposphere may occur in two distinct type of ammoniated aerosol solutions. First (NH<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub>H(SO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> (letovicite) may crystallize in acidic solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>. Second double salts of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> may crystallize in nearly neutralized solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub>. Finally we discuss how the presence of crystalline salt surfaces in aqueous solutions may alter the mode of cirrus cloud formation from homogeneous to heterogeneous freezing nucleation.</jats:p> The role of ammoniated aerosols in cirrus cloud nucleation Geophysical Research Letters |
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1998 |
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| title |
The role of ammoniated aerosols in cirrus cloud nucleation |
| title_unstemmed |
The role of ammoniated aerosols in cirrus cloud nucleation |
| title_full |
The role of ammoniated aerosols in cirrus cloud nucleation |
| title_fullStr |
The role of ammoniated aerosols in cirrus cloud nucleation |
| title_full_unstemmed |
The role of ammoniated aerosols in cirrus cloud nucleation |
| title_short |
The role of ammoniated aerosols in cirrus cloud nucleation |
| title_sort |
the role of ammoniated aerosols in cirrus cloud nucleation |
| topic |
General Earth and Planetary Sciences Geophysics |
| url |
http://dx.doi.org/10.1029/97gl03585 |
| publishDate |
1998 |
| physical |
1379-1382 |
| description |
<jats:p>Recent results obtained during the SUCCESS experiment show that aerosols containing ammonium ion are commonly found in the upper troposphere and therefore it is of great importance to investigate the ice freezing properties of such aerosols. For this purpose we present mathematical expressions, derived from recent model calculations and laboratory data, for calculating the deliquescence relative humidity of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>, NH<jats:sub>4</jats:sub>HSO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> under upper tropospheric conditions. Using these functions we define the temperature and relative humidity requirements for the deliquescence of dry particles in the upper troposphere. Further using a thermodynamic model of the H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>/HNO<jats:sub>3</jats:sub>/NH<jats:sub>3</jats:sub>/ H<jats:sub>2</jats:sub>O system, we calculate the variation in the supercooled aerosol composition and saturation ratios of various ionic salts in solution as a function of temperature and relative humidity. Using these values we show salt crystallization in the upper troposphere may occur in two distinct type of ammoniated aerosol solutions. First (NH<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub>H(SO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> (letovicite) may crystallize in acidic solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>. Second double salts of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> may crystallize in nearly neutralized solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub>. Finally we discuss how the presence of crystalline salt surfaces in aqueous solutions may alter the mode of cirrus cloud formation from homogeneous to heterogeneous freezing nucleation.</jats:p> |
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| description | <jats:p>Recent results obtained during the SUCCESS experiment show that aerosols containing ammonium ion are commonly found in the upper troposphere and therefore it is of great importance to investigate the ice freezing properties of such aerosols. For this purpose we present mathematical expressions, derived from recent model calculations and laboratory data, for calculating the deliquescence relative humidity of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>, NH<jats:sub>4</jats:sub>HSO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> under upper tropospheric conditions. Using these functions we define the temperature and relative humidity requirements for the deliquescence of dry particles in the upper troposphere. Further using a thermodynamic model of the H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>/HNO<jats:sub>3</jats:sub>/NH<jats:sub>3</jats:sub>/ H<jats:sub>2</jats:sub>O system, we calculate the variation in the supercooled aerosol composition and saturation ratios of various ionic salts in solution as a function of temperature and relative humidity. Using these values we show salt crystallization in the upper troposphere may occur in two distinct type of ammoniated aerosol solutions. First (NH<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub>H(SO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> (letovicite) may crystallize in acidic solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>. Second double salts of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> may crystallize in nearly neutralized solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub>. Finally we discuss how the presence of crystalline salt surfaces in aqueous solutions may alter the mode of cirrus cloud formation from homogeneous to heterogeneous freezing nucleation.</jats:p> |
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| imprint_str_mv | American Geophysical Union (AGU), 1998 |
| institution | DE-Gla1, DE-Zi4, DE-15, DE-Rs1, DE-Pl11, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161 |
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| physical | 1379-1382 |
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| spelling | Tabazadeh, Azadeh Toon, Owen B. 0094-8276 1944-8007 American Geophysical Union (AGU) General Earth and Planetary Sciences Geophysics http://dx.doi.org/10.1029/97gl03585 <jats:p>Recent results obtained during the SUCCESS experiment show that aerosols containing ammonium ion are commonly found in the upper troposphere and therefore it is of great importance to investigate the ice freezing properties of such aerosols. For this purpose we present mathematical expressions, derived from recent model calculations and laboratory data, for calculating the deliquescence relative humidity of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>, NH<jats:sub>4</jats:sub>HSO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> under upper tropospheric conditions. Using these functions we define the temperature and relative humidity requirements for the deliquescence of dry particles in the upper troposphere. Further using a thermodynamic model of the H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>/HNO<jats:sub>3</jats:sub>/NH<jats:sub>3</jats:sub>/ H<jats:sub>2</jats:sub>O system, we calculate the variation in the supercooled aerosol composition and saturation ratios of various ionic salts in solution as a function of temperature and relative humidity. Using these values we show salt crystallization in the upper troposphere may occur in two distinct type of ammoniated aerosol solutions. First (NH<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub>H(SO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> (letovicite) may crystallize in acidic solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>. Second double salts of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub> may crystallize in nearly neutralized solutions of (NH<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> and NH<jats:sub>4</jats:sub>NO<jats:sub>3</jats:sub>. Finally we discuss how the presence of crystalline salt surfaces in aqueous solutions may alter the mode of cirrus cloud formation from homogeneous to heterogeneous freezing nucleation.</jats:p> The role of ammoniated aerosols in cirrus cloud nucleation Geophysical Research Letters |
| spellingShingle | Tabazadeh, Azadeh, Toon, Owen B., Geophysical Research Letters, The role of ammoniated aerosols in cirrus cloud nucleation, General Earth and Planetary Sciences, Geophysics |
| title | The role of ammoniated aerosols in cirrus cloud nucleation |
| title_full | The role of ammoniated aerosols in cirrus cloud nucleation |
| title_fullStr | The role of ammoniated aerosols in cirrus cloud nucleation |
| title_full_unstemmed | The role of ammoniated aerosols in cirrus cloud nucleation |
| title_short | The role of ammoniated aerosols in cirrus cloud nucleation |
| title_sort | the role of ammoniated aerosols in cirrus cloud nucleation |
| title_unstemmed | The role of ammoniated aerosols in cirrus cloud nucleation |
| topic | General Earth and Planetary Sciences, Geophysics |
| url | http://dx.doi.org/10.1029/97gl03585 |