Changes in the shape of cloud ice water content vertical structure due to aerosol variations
Changes in the shape of cloud ice water content (IWC) vertical structure due to variations in Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depths (AODs), Ozone Monitoring Instrument (OMI) absorptive aerosol optical depths (AAODs), and Microwave Limb Sounder (MLS) CO (an a...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-05-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/16/6091/2016/acp-16-6091-2016.pdf |
| _version_ | 1811281622589243392 |
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| author | S. T. Massie S. T. Massie J. Delanoë C. G. Bardeen J. H. Jiang L. Huang |
| author_facet | S. T. Massie S. T. Massie J. Delanoë C. G. Bardeen J. H. Jiang L. Huang |
| author_sort | S. T. Massie |
| collection | DOAJ |
| description | Changes in the shape of cloud ice water content (IWC) vertical structure due
to variations in Moderate Resolution Imaging Spectroradiometer (MODIS)
aerosol optical depths (AODs), Ozone Monitoring Instrument (OMI) absorptive aerosol optical
depths (AAODs), and Microwave Limb Sounder (MLS) CO (an absorptive aerosol
proxy) at 215 hPa are calculated in the Tropics during 2007–2010 based
upon an analysis of DARDAR IWC profiles for deep convective clouds. DARDAR
profiles are a joint retrieval of CloudSat-CALIPSO data. Analysis is
performed for 12 separate regions over land and ocean, and carried out
applying MODIS AOD fields that attempt to correct for 3-D cloud adjacency
effects. The 3-D cloud adjacency effects have a small impact upon our
particular calculations of aerosol–cloud indirect effects. IWC profiles are
averaged for three AOD bins individually for the 12 regions. The IWC average
profiles are also normalized to unity at 5 km altitude in order to study
changes in the shape of the average IWC profiles as AOD increases.
Derivatives of the IWC average profiles, and derivatives of the IWC shape
profiles, in percent change per 0.1 change in MODIS AOD units, are calculated
separately for each region. Means of altitude-specific probability
distribution functions, which include both ocean and land IWC shape regional
derivatives, are modest, near 5 %, and positive to the 2<i>σ</i> level
between 11 and 15 km altitude. Similar analyses are carried out for three
AAOD and three CO bins. On average, the vertical profiles of the means of the
derivatives based upon the profile shapes over land and ocean are smaller for
the profiles binned according to AAOD and CO values, than for the MODIS AODs,
which include both scattering and absorptive aerosol. This difference in
character supports the assertion that absorptive aerosol can inhibit cloud
development. |
| first_indexed | 2024-04-13T01:36:54Z |
| format | Article |
| id | doaj.art-e07fd4e9150e4f89bfbc5f7a468b4926 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-13T01:36:54Z |
| publishDate | 2016-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-e07fd4e9150e4f89bfbc5f7a468b49262022-12-22T03:08:21ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242016-05-01166091610510.5194/acp-16-6091-2016Changes in the shape of cloud ice water content vertical structure due to aerosol variationsS. T. Massie0S. T. Massie1J. Delanoë2C. G. Bardeen3J. H. Jiang4L. Huang5Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USANational Center for Atmospheric Research, Atmospheric Chemistry and Modeling, Boulder, Colorado, USALATMOS/IPSL/UVSQ/CNRS, Guyancourt, FranceNational Center for Atmospheric Research, Atmospheric Chemistry and Modeling, Boulder, Colorado, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USAChanges in the shape of cloud ice water content (IWC) vertical structure due to variations in Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depths (AODs), Ozone Monitoring Instrument (OMI) absorptive aerosol optical depths (AAODs), and Microwave Limb Sounder (MLS) CO (an absorptive aerosol proxy) at 215 hPa are calculated in the Tropics during 2007–2010 based upon an analysis of DARDAR IWC profiles for deep convective clouds. DARDAR profiles are a joint retrieval of CloudSat-CALIPSO data. Analysis is performed for 12 separate regions over land and ocean, and carried out applying MODIS AOD fields that attempt to correct for 3-D cloud adjacency effects. The 3-D cloud adjacency effects have a small impact upon our particular calculations of aerosol–cloud indirect effects. IWC profiles are averaged for three AOD bins individually for the 12 regions. The IWC average profiles are also normalized to unity at 5 km altitude in order to study changes in the shape of the average IWC profiles as AOD increases. Derivatives of the IWC average profiles, and derivatives of the IWC shape profiles, in percent change per 0.1 change in MODIS AOD units, are calculated separately for each region. Means of altitude-specific probability distribution functions, which include both ocean and land IWC shape regional derivatives, are modest, near 5 %, and positive to the 2<i>σ</i> level between 11 and 15 km altitude. Similar analyses are carried out for three AAOD and three CO bins. On average, the vertical profiles of the means of the derivatives based upon the profile shapes over land and ocean are smaller for the profiles binned according to AAOD and CO values, than for the MODIS AODs, which include both scattering and absorptive aerosol. This difference in character supports the assertion that absorptive aerosol can inhibit cloud development.https://www.atmos-chem-phys.net/16/6091/2016/acp-16-6091-2016.pdf |
| spellingShingle | S. T. Massie S. T. Massie J. Delanoë C. G. Bardeen J. H. Jiang L. Huang Changes in the shape of cloud ice water content vertical structure due to aerosol variations Atmospheric Chemistry and Physics |
| title | Changes in the shape of cloud ice water content vertical structure due to aerosol variations |
| title_full | Changes in the shape of cloud ice water content vertical structure due to aerosol variations |
| title_fullStr | Changes in the shape of cloud ice water content vertical structure due to aerosol variations |
| title_full_unstemmed | Changes in the shape of cloud ice water content vertical structure due to aerosol variations |
| title_short | Changes in the shape of cloud ice water content vertical structure due to aerosol variations |
| title_sort | changes in the shape of cloud ice water content vertical structure due to aerosol variations |
| url | https://www.atmos-chem-phys.net/16/6091/2016/acp-16-6091-2016.pdf |
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