气候变化领域集成服务门户(CCPortal): Cirrus-induced shortwave radiative effects depending on their optical and physical properties: Case studies using simulations and measurements

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DOI	10.1016/j.atmosres.2020.105095
	Cirrus-induced shortwave radiative effects depending on their optical and physical properties: Case studies using simulations and measurements
	Córdoba-Jabonero C.; Gómez-Martín L.; del Águila A.; Vilaplana J.M.; López-Cayuela M.-Á.; Zorzano M.-P.
发表日期	2020
ISSN	0169-8095
卷号	246
英文摘要	Cirrus (Ci) clouds play an important role in the atmospheric radiative balance, and hence in Climate Change. In this work, a polarized Micro-Pulse Lidar (P-MPL), standard NASA/Micro Pulse NETwork (MPLNET) system, deployed at the INTA/El Arenosillo station in Huelva (SW Iberian Peninsula) is used for Ci detection and characterization for the first time at this site. Three days were selected on the basis of the predominantly detected Ci clouds in dependence on their cloud optical depth (COD). Hence, three Ci cloud categories were examined at day-times for comparison with solar radiation issues: 19 cases of sub-visuals (svCi, COD: 0.01–0.03) on 1 October 2016, 7 cases of semitransparents (stCi, COD: 0.03–0.30) on 8 May 2017, and 17 cases of opaques (opCi, COD: 0.3–3.0) on 28 October 2016. Their radiative-relevant optical, macro- and micro-physical properties were retrieved. The mean COD for the svCi, stCi and opCi groups was 0.02 ± 0.01, 0.22 ± 0.08 and 0.93 ± 0.40, respectively; in overall, their lidar ratio ranged between 25 and 35 sr. Ci clouds were detected at 11–13 km height (top boundaries) with geometrical thicknesses of 1.7–2.0 km. Temperatures reported at those altitudes corresponded to lower values than the thermal threshold for homogenous ice formation. Volume linear depolarization ratios of 0.3–0.4 (and normalized backscattering ratios higher than 0.9) also confirmed Ci clouds purely composed of ice particles. Their effective radius was within the interval of 9–15 μm size, and the ice water path ranged from 0.02 (svCi) to 9.9 (opCi) g m−2. The Cirrus Cloud Radiative Effect (CCRE) was estimated using a Radiative Transfer (RT) model for Ci-free conditions and Ci-mode (Ci presence) scenarios. RT simulations were performed for deriving the CCRE at the top-of-atmosphere (TOA) and on surface (SRF), and also the atmospheric CCRE, for the overall shortwave (SW) range and their spectral sub-intervals (UV, VIS and NIR). A good agreement was first obtained for the RT simulations as validated against solar radiation measurements under clean conditions for solar zenith angles less than 75° (differences were mainly within ±20 W m−2 and correlation coefficients close to 1). By considering all the Ci clouds, independently on their COD, the mean SW CCRE values at TOA and SRF were, respectively, −30 ± 26 and − 24 ± 19 W m−2, being the mean atmospheric CCRE of −7 ± 7 W m−2; these values are in good agreement with global annual estimates found for Ci clouds. By using linear regression analysis, a Ci-induced enhancing cooling radiative effect was observed as COD increased for all the spectral ranges, with high correlations. In particular, the SW CCRE at TOA and SRF, and the atmospheric CCRE, presented COD-dependent rates of −74 ± 4, −55 ± 5, −19 ± 2 W m−2τ−1, respectively. Additionally, increasing negative rates are found from UV to NIR for each Ci category, reflecting a higher cooling NIR contribution w.r.t. UV and VIS ranges to the SW CCRE, and being also more pronounced at the TOA w.r.t. on SRF, as expected. The contribution of the SW CCRE to the net (SW + LW) radiative balance can be also potentially relevant. These results are especially significant for space-borne photometric/radiometric instrumentation and can contribute to validation purposes of the next ESA's EarthCARE mission, whose principal scientific goal is focused on radiation-aerosol-cloud interaction research. © 2020 Elsevier B.V.
关键词	Climate change Clouds Ice Infrared devices NASA Particle size analysis Physical properties Regression analysis Solar radiation Aerosol-cloud interaction Backscattering ratio Correlation coefficient Linear depolarization ratios Radiative transfer model Simulations and measurements Solar radiation measurements SW Iberian Peninsula Optical radar cirrus computer simulation lidar measurement method optical depth optical property physical property radiative transfer shortwave radiation solar radiation
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132358
推荐引用方式 GB/T 7714	Córdoba-Jabonero C.,Gómez-Martín L.,del Águila A.,et al. Cirrus-induced shortwave radiative effects depending on their optical and physical properties: Case studies using simulations and measurements[J]. Atmospheric Research,2020,246.
APA	Córdoba-Jabonero C.,Gómez-Martín L.,del Águila A.,Vilaplana J.M.,López-Cayuela M.-Á.,&Zorzano M.-P..(2020).Cirrus-induced shortwave radiative effects depending on their optical and physical properties: Case studies using simulations and measurements.,246.
MLA	Córdoba-Jabonero C.,et al."Cirrus-induced shortwave radiative effects depending on their optical and physical properties: Case studies using simulations and measurements".246(2020).