TY - JOUR
T1 - Characterization of cumulus cloud fields using trajectories in the center of gravity versus water mass phase space
T2 - 2. Aerosol effects on warm convective clouds
AU - Heiblum, Reuven H.
AU - Altaratz, Orit
AU - Koren, Ilan
AU - Feingold, Graham
AU - Kostinski, Alexander B.
AU - Khain, Alexander P.
AU - Ovchinnikov, Mikhail
AU - Fredj, Erick
AU - Dagan, Guy
AU - Pinto, Lital
AU - Yaish, Ricki
AU - Chen, Qian
N1 - Publisher Copyright:
© 2016. American Geophysical Union. All Rights Reserved.
PY - 2016
Y1 - 2016
N2 - In Part I of this work a 3-D cloud tracking algorithm and phase space of center of gravity altitude versus cloud liquid water mass (CvM space) were introduced and described in detail. We showed how new physical insight can be gained by following cloud trajectories in the CvM space. Here this approach is used to investigate aerosol effects on cloud fields of warm cumuli. We show a clear effect of the aerosol loading on the shape and size of CvM clusters. We also find fundamental differences in the CvM space between simulations using bin versus bulk microphysical schemes, with the bin scheme precipitation expressing much higher sensitivity to changes in aerosol concentrations. Using the bin microphysical scheme, we find that the increase in cloud center of gravity altitude with increase in aerosol concentrations occurs for a wide range of cloud sizes. This is attributed to reduced sedimentation, increased buoyancy and vertical velocities, and increased environmental instability, all of which are tightly coupled to inhibition of precipitation processes and subsequent feedbacks of clouds on their environment. Many of the physical processes shown here are consistent with processes typically associated with cloud invigoration.
AB - In Part I of this work a 3-D cloud tracking algorithm and phase space of center of gravity altitude versus cloud liquid water mass (CvM space) were introduced and described in detail. We showed how new physical insight can be gained by following cloud trajectories in the CvM space. Here this approach is used to investigate aerosol effects on cloud fields of warm cumuli. We show a clear effect of the aerosol loading on the shape and size of CvM clusters. We also find fundamental differences in the CvM space between simulations using bin versus bulk microphysical schemes, with the bin scheme precipitation expressing much higher sensitivity to changes in aerosol concentrations. Using the bin microphysical scheme, we find that the increase in cloud center of gravity altitude with increase in aerosol concentrations occurs for a wide range of cloud sizes. This is attributed to reduced sedimentation, increased buoyancy and vertical velocities, and increased environmental instability, all of which are tightly coupled to inhibition of precipitation processes and subsequent feedbacks of clouds on their environment. Many of the physical processes shown here are consistent with processes typically associated with cloud invigoration.
UR - http://www.scopus.com/inward/record.url?scp=84973561980&partnerID=8YFLogxK
U2 - 10.1002/2015JD024193
DO - 10.1002/2015JD024193
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AN - SCOPUS:84973561980
SN - 0148-0227
VL - 121
SP - 6356
EP - 6373
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
IS - 11
ER -