Cloud Adiabaticity and Its Relationship to Marine Stratocumulus Characteristics Over the Northeast Pacific Ocean

被引:24
作者
Braun, Rachel A. [1 ]
Dadashazar, Hossein [1 ]
MacDonald, Alexander B. [1 ]
Crosbie, Ewan [2 ,3 ]
Jonsson, Haflidi H. [4 ]
Woods, Roy K. [4 ]
Flagan, Richard C. [5 ]
Seinfeld, John H. [5 ]
Sorooshian, Armin [1 ,6 ]
机构
[1] Univ Arizona, Dept Chem & Environm Engn, Tucson, AZ 85721 USA
[2] Sci Syst & Applicat Inc, Hampton, VA USA
[3] NASA, Langley Res Ctr, Hampton, VA 23665 USA
[4] Naval Postgrad Sch, Dept Meteorol, Monterey, CA USA
[5] CALTECH, Dept Chem Engn, Pasadena, CA 91125 USA
[6] Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85721 USA
关键词
DROPLET NUMBER CONCENTRATION; IN-SITU; EFFECTIVE RADIUS; MICROPHYSICAL PROPERTIES; RADIATIVE PROPERTIES; STRATIFORM CLOUDS; BOUNDARY-LAYER; MIXING PROCESS; WATER-CONTENT; WARM RAIN;
D O I
10.1029/2018JD029287
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Cloud adiabaticity () is defined as the ratio of the actual liquid water path (LWPmeasured) in a cloud to its corresponding adiabatic value (LWPad). Processes such as drizzle and entrainment can lead to subadiabatic LWPmeasured. This study examines and its relationship to microphysical properties for 86 cloud events over the Northeast Pacific Ocean based on data collected during four separate summertime airborne campaigns. For the study region, was found to be 0.7660.134. For most cases, clouds with a low value of were found to have lower droplet number concentration (N-d), higher droplet effective radius (r(e)), higher relative dispersion (d), and higher rain rate (R). The subcloud aerosol concentration (N-a) was often less for the low- cases. The relationship between and the vertical profiles and cloud-top characteristics for both the cloud droplet-only spectrum and full spectrum (cloud and rain droplets) is also examined. Inclusion of rain droplets produced a larger change in d for the low- clouds as compared to the high- clouds. On average, R increased at cloud top for high- clouds but decreased at cloud top for low- clouds. Accounting for when estimating N-d from Moderate Resolution Imaging Spectroradiometer retrievals results in better agreement with in situ N-d values. Results of this work motivate the need for additional focus on the factors governing , such as cloud type, and implications of its value, especially for remote-sensing retrievals.
引用
收藏
页码:13790 / 13806
页数:17
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