UntitledSource: Journal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 012::page 4075Author:Ma, Yong-Feng;Malinowski, Szymon P.;Karpińska, Katarzyna;Gerber, Hermann E.;Kumala, Wojciech
DOI: 10.1175/JAS-D-17-0015.1Publisher: American Meteorological Society
Abstract: AbstractThe authors have analyzed the scaling behavior of marine boundary layer (MBL) clouds using high-resolution temperature (T) and liquid water content (LWC) fluctuations from aircraft measurements collected over the Pacific Ocean during the Physics of Stratocumulus Top (POST) research campaign in summer of 2008. As an extension of the past studies for scale-invariant properties of MBL clouds, the authors studied the variability of scaling exponents with height. The results showed that both LWC and T have two distinct scaling regimes: the first one displays scale invariance over a range from about 1?5 m to at least 7 km, and the second one goes from about 0.1?1 to 1?5 m. For the large-scale regime (r > 1?5 m), turbulence in MBL clouds is multifractal, while scale break and scaling exponents vary with height, most significantly in the cloud-top region. For example, LWC spectral exponent ? increases from 1.42 at cloud base to 1.58 at cloud top, while scale break decreases from ~5 m at cloud base to 0.8 m at cloud top. The bifractal parameters (H1, C1) for LWC increase from (0.14, 0.02) at cloud base to (0.33, 0.1) at cloud top while maintaining a statistically significant linear relationship C1 ≈ 0.4H1 ? 0.04 in MBL clouds. From near surface to cloud top, (H1, C1) for T also increase with height, but above cloud top H1 increases and C1 decreases with height. The results suggest the existence of three turbulence regimes: near the surface, in the middle of the boundary layer, and in the cloud-top region, which need to be distinguished.
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| contributor author | Ma, Yong-Feng;Malinowski, Szymon P.;Karpińska, Katarzyna;Gerber, Hermann E.;Kumala, Wojciech | |
| date accessioned | 2018-01-03T11:02:39Z | |
| date available | 2018-01-03T11:02:39Z | |
| date copyright | 9/7/2017 12:00:00 AM | |
| date issued | 2017 | |
| identifier other | jas-d-17-0015.1.pdf | |
| identifier uri | http://138.201.223.254:8080/yetl1/handle/yetl/4246485 | |
| description abstract | AbstractThe authors have analyzed the scaling behavior of marine boundary layer (MBL) clouds using high-resolution temperature (T) and liquid water content (LWC) fluctuations from aircraft measurements collected over the Pacific Ocean during the Physics of Stratocumulus Top (POST) research campaign in summer of 2008. As an extension of the past studies for scale-invariant properties of MBL clouds, the authors studied the variability of scaling exponents with height. The results showed that both LWC and T have two distinct scaling regimes: the first one displays scale invariance over a range from about 1?5 m to at least 7 km, and the second one goes from about 0.1?1 to 1?5 m. For the large-scale regime (r > 1?5 m), turbulence in MBL clouds is multifractal, while scale break and scaling exponents vary with height, most significantly in the cloud-top region. For example, LWC spectral exponent ? increases from 1.42 at cloud base to 1.58 at cloud top, while scale break decreases from ~5 m at cloud base to 0.8 m at cloud top. The bifractal parameters (H1, C1) for LWC increase from (0.14, 0.02) at cloud base to (0.33, 0.1) at cloud top while maintaining a statistically significant linear relationship C1 ≈ 0.4H1 ? 0.04 in MBL clouds. From near surface to cloud top, (H1, C1) for T also increase with height, but above cloud top H1 increases and C1 decreases with height. The results suggest the existence of three turbulence regimes: near the surface, in the middle of the boundary layer, and in the cloud-top region, which need to be distinguished. | |
| publisher | American Meteorological Society | |
| type | Journal Paper | |
| journal volume | 74 | |
| journal issue | 12 | |
| journal title | Journal of the Atmospheric Sciences | |
| identifier doi | 10.1175/JAS-D-17-0015.1 | |
| journal fristpage | 4075 | |
| journal lastpage | 4092 | |
| tree | Journal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 012 | |
| contenttype | Fulltext |