气候变化领域集成服务门户(CCPortal): An emulator approach to stratocumulus susceptibility

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DOI	10.5194/acp-19-10191-2019
	An emulator approach to stratocumulus susceptibility
	Glassmeier F.; Hoffmann F.; Johnson J.S.; Yamaguchi T.; Carslaw K.S.; Feingold G.
发表日期	2019
ISSN	16807316
起始页码	10191
结束页码	10203
卷号	19 期号:15
英文摘要	The climatic relevance of aerosol-cloud interactions depends on the sensitivity of the radiative effect of clouds to cloud droplet number N, and liquid water path LWP. We derive the dependence of cloud fraction CF, cloud albedo AC, and the relative cloud radiative effect rCRE D CF • AC on N and LWP from 159 large-eddy simulations of nocturnal stratocumulus. These simulations vary in their initial conditions for temperature, moisture, boundary-layer height, and aerosol concentration but share boundary conditions for surface fluxes and subsidence. Our approach is based on Gaussian-process emulation, a statistical technique related to machine learning. We succeed in building emulators that accurately predict simulated values of CF, AC, and rCRE for given values of N and LWP. Emulator-derived susceptibilities @ lnrCRE=@ lnN and @ lnrCRE=@ lnLWP cover the nondrizzling, fully overcast regime as well as the drizzling regime with broken cloud cover. Theoretical results, which are limited to the nondrizzling regime, are reproduced. The susceptibility @ lnrCRE=@ lnN captures the strong sensitivity of the cloud radiative effect to cloud fraction, while the susceptibility @ lnrCRE=@ lnLWP describes the influence of cloud amount on cloud albedo irrespective of cloud fraction. Our emulation-based approach provides a powerful tool for summarizing complex data in a simple framework that captures the sensitivities of cloud-field properties over a wide range of states. © 2019 Author(s).
语种	英语
scopus关键词	aerosol composition; cloud droplet; cloud microphysics; cloud radiative forcing; nocturnal boundary layer; numerical model; stratocumulus
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144764
作者单位	Chemical Sciences Division, NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80302, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309, United States; School of Earth and Environment, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, United Kingdom; Department of Environmental Sciences, Wageningen University, P.O. Box 47, Wageningen, 6700AA, Netherlands
推荐引用方式 GB/T 7714	Glassmeier F.,Hoffmann F.,Johnson J.S.,et al. An emulator approach to stratocumulus susceptibility[J],2019,19(15).
APA	Glassmeier F.,Hoffmann F.,Johnson J.S.,Yamaguchi T.,Carslaw K.S.,&Feingold G..(2019).An emulator approach to stratocumulus susceptibility.Atmospheric Chemistry and Physics,19(15).
MLA	Glassmeier F.,et al."An emulator approach to stratocumulus susceptibility".Atmospheric Chemistry and Physics 19.15(2019).