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DOI | 10.1002/2016JD025945 |
A 1-D variational retrieval of temperature, humidity, and liquid cloud properties: Performance under idealized and real conditions | |
Ebell, K.1; Loehnert, U.1; Paschke, E.2; Orlandi, E.3; Schween, J. H.1; Crewell, S.1 | |
2017-02-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | An extended version of the Integrated Profiling Technique (IPT) is presented. The IPT combines measurements from cloud radar and microwave radiometer (MWR) with prior information in a 1D-Var approach in order to retrieve physically consistent atmospheric profiles of temperature, absolute humidity, liquid water content (LWC), and recently also cloud droplet effective radius (REF). Physical consistency implies the reproducibility of the measurements within the uncertainties. Results based on synthetic observations revealed a good retrieval performance with a high convergence rate of 98%. Retrieval uncertainties are typically around 0.06 gm(-3) for LWC and 0.6 mu m for REF. For the application to real measurements, quality-controlled, bias-free observations are crucial. A newly developed MWR spectral consistency check, which was applied to the measurements at the Julich Observatory for Cloud Evolution (JOYCE), revealed strongly bias-affected channels. The IPT itself can serve as a further quality check: particularly in clear-sky cases, nonconvergence or physically inconsistent solutions may hint at measurement offset errors. Based on sensitivity studies, the final set of MWR frequencies was identified and the retrieval applied to 1 year of data. Physically consistent solutions could be found in 62% of all processed cases. A focus was put on the analysis of nondrizzling single-layer water clouds which typically have small geometrical thicknesses (< 300 m), low liquid water paths (< 50 gm(-2)), and small REF (< 5 mu m). The retrieved data product contains a high potential for the analysis of warm cloud characteristics and, in combination with auxiliary information from the JOYCE instrumentation, of associated boundary layer processes. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396119200021 |
WOS关键词 | MICROWAVE RADIOMETERS ; WATER-VAPOR ; MODEL EVALUATION ; BOUNDARY-LAYER ; DOPPLER LIDAR ; RADAR ; PROFILES ; ACCURACY ; CLEAR ; PATH |
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/33801 |
专题 | 气候变化 |
作者单位 | 1.Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany; 2.Richard Assmann Observ, Deutscher Wetterdienst, Meteorol Observ Lindenberg, Lindenberg, Germany; 3.RPG Radiometer Phys GmbH, Meckenheim, Germany |
推荐引用方式 GB/T 7714 | Ebell, K.,Loehnert, U.,Paschke, E.,et al. A 1-D variational retrieval of temperature, humidity, and liquid cloud properties: Performance under idealized and real conditions[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(3). |
APA | Ebell, K.,Loehnert, U.,Paschke, E.,Orlandi, E.,Schween, J. H.,&Crewell, S..(2017).A 1-D variational retrieval of temperature, humidity, and liquid cloud properties: Performance under idealized and real conditions.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(3). |
MLA | Ebell, K.,et al."A 1-D variational retrieval of temperature, humidity, and liquid cloud properties: Performance under idealized and real conditions".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.3(2017). |
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