GSTDTAP  > 地球科学
DOI10.1175/JAS-D-17-0244.1
Observed Boundary Layer Controls on Shallow Cumulus at the ARM Southern Great Plains Site
Lareau, Neil P.1; Zhang, Yunyan2; Klein, Stephen A.2
2018-07-01
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2018
卷号75期号:7页码:2235-2255
文章类型Article
语种英语
国家USA
英文摘要

The boundary layer controls on shallow cumulus (ShCu) convection are examined using a suite of remote and in situ sensors at ARM Southern Great Plains (SGP). A key instrument in the study is a Doppler lidar that measures vertical velocity in the CBL and along cloud base. Using a sample of 138 ShCu days, the composite structure of the ShCu CBL is examined, revealing increased vertical velocity (VV) variance during periods of medium cloud cover and higher VV skewness on ShCu days than on clear-sky days. The subcloud circulations of 1791 individual cumuli are also examined. From these data, we show that cloud-base updrafts, normalized by convective velocity, vary as a function of updraft width normalized by CBL depth. It is also found that 63% of clouds have positive cloud-base mass flux and are linked to coherent updrafts extending over the depth of the CBL. In contrast, negative mass flux clouds lack coherent subcloud updrafts. Both sets of clouds possess narrow downdrafts extending from the cloud edges into the subcloud layer. These downdrafts are also present adjacent to cloud-free updrafts, suggesting they are mechanical in origin. The cloud-base updraft data are subsequently combined with observations of convective inhibition to form dimensionless cloud inhibition (CI) parameters. Updraft fraction and liquid water path are shown to vary inversely with CI, a finding consistent with CIN-based closures used in convective parameterizations. However, we also demonstrate a limited link between CBL vertical velocity variance and cloud-base updrafts, suggesting that additional factors, including updraft width, are necessary predictors for cloud-base updrafts.


英文关键词Boundary layer Cumulus clouds Mass fluxes transport Lidars Lidar observations Convective parameterization
领域地球科学
收录类别SCI-E
WOS记录号WOS:000435438400003
WOS关键词EMITTED RADIANCE INTERFEROMETER ; DEEP CONVECTION ; DOPPLER LIDAR ; DIURNAL-CYCLE ; MASS-FLUX ; THERMODYNAMIC PROFILES ; AIRCRAFT OBSERVATIONS ; MIXED-LAYER ; WATER-VAPOR ; PART II
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/29220
专题地球科学
作者单位1.San Jose State Univ, San Jose, CA 95192 USA;
2.Lawrence Livermore Natl Lab, Livermore, CA USA
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Lareau, Neil P.,Zhang, Yunyan,Klein, Stephen A.. Observed Boundary Layer Controls on Shallow Cumulus at the ARM Southern Great Plains Site[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(7):2235-2255.
APA Lareau, Neil P.,Zhang, Yunyan,&Klein, Stephen A..(2018).Observed Boundary Layer Controls on Shallow Cumulus at the ARM Southern Great Plains Site.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(7),2235-2255.
MLA Lareau, Neil P.,et al."Observed Boundary Layer Controls on Shallow Cumulus at the ARM Southern Great Plains Site".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.7(2018):2235-2255.
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