气候变化领域集成服务门户(CCPortal): Influence of Thermodynamic State Changes on Surface Cloud Radiative Forcing in the Arctic: A Comparison of Two Approaches Using Data From AFLUX and SHEBA

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DOI	10.1029/2020JD033589
	Influence of Thermodynamic State Changes on Surface Cloud Radiative Forcing in the Arctic: A Comparison of Two Approaches Using Data From AFLUX and SHEBA
	Stapf J.; Ehrlich A.; Wendisch M.
发表日期	2021
ISSN	2169897X
卷号	126 期号:5
英文摘要	The cloud radiative forcing (CRF) quantifies the warming or cooling effects of clouds. To derive the CRF, reference values of net (downward minus upward) irradiances in cloud-free conditions are required. There are two groups of techniques to estimate these reference values; one is based on radiative transfer modeling, and a second group uses measurements in cloud-free situations. To compare both approaches, we first look at a case study from the airborne measurements of radiative and turbulent FLUXes of energy and momentum in the Arctic boundary layer (AFLUX) campaign, where a moving cloud field with a sharp edge separating a cloudy boundary layer from an adjacent evolving cloud-free area was probed. These data enabled the quantification of the impact of changing atmospheric and surface properties relevant for the reference net irradiances in cloud-free conditions. The systematically higher surface albedo below clouds compared to cloud-free conditions, results in a 11 W·m−2 smaller shortwave cooling effect by clouds estimated from the radiative transfer approach compared to the measurement-based one. Due to the transition of thermodynamic parameters between the cloudy and cloud-free atmospheric states, a 20 W·m−2 stronger warming effect is estimated by the radiative transfer approach. In a second step, radiative transfer simulations based on radiosoundings from the Surface Heat Budget of the Arctic Ocean campaign are used to quantify the impact of the vertical profiles of thermodynamic properties on the CRF. The largest difference between the longwave CRF estimated by the two methods is found in autumn with up to 25 W·m−2. © 2021. The Authors.
英文关键词	cloud radiative forcing; radiative energy budget sea ice; thermodynamic states
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185426
作者单位	Leipzig Institute for Meteorology (LIM), University of Leipzig, Germany
推荐引用方式 GB/T 7714	Stapf J.,Ehrlich A.,Wendisch M.. Influence of Thermodynamic State Changes on Surface Cloud Radiative Forcing in the Arctic: A Comparison of Two Approaches Using Data From AFLUX and SHEBA[J],2021,126(5).
APA	Stapf J.,Ehrlich A.,&Wendisch M..(2021).Influence of Thermodynamic State Changes on Surface Cloud Radiative Forcing in the Arctic: A Comparison of Two Approaches Using Data From AFLUX and SHEBA.Journal of Geophysical Research: Atmospheres,126(5).
MLA	Stapf J.,et al."Influence of Thermodynamic State Changes on Surface Cloud Radiative Forcing in the Arctic: A Comparison of Two Approaches Using Data From AFLUX and SHEBA".Journal of Geophysical Research: Atmospheres 126.5(2021).