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contributor authorLöhnert, Ulrich
contributor authorCrewell, S.
contributor authorKrasnov, O.
contributor authorO’Connor, E.
contributor authorRusschenberg, H.
date accessioned2017-06-09T16:20:37Z
date available2017-06-09T16:20:37Z
date copyright2008/08/01
date issued2008
identifier issn0739-0572
identifier otherams-66134.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207437
description abstractThis paper describes advances in ground-based thermodynamic profiling of the lower troposphere through sensor synergy. The well-documented integrated profiling technique (IPT), which uses a microwave profiler, a cloud radar, and a ceilometer to simultaneously retrieve vertical profiles of temperature, humidity, and liquid water content (LWC) of nonprecipitating clouds, is further developed toward an enhanced performance in the boundary layer and lower troposphere. For a more accurate temperature profile, this is accomplished by including an elevation scanning measurement modus of the microwave profiler. Height-dependent RMS accuracies of temperature (humidity) ranging from ?0.3 to 0.9 K (0.5?0.8 g m?3) in the boundary layer are derived from retrieval simulations and confirmed experimentally with measurements at distinct heights taken during the 2005 International Lindenberg Campaign for Assessment of Humidity and Cloud Profiling Systems and its Impact on High-Resolution Modeling (LAUNCH) of the German Weather Service. Temperature inversions, especially of the lower boundary layer, are captured in a very satisfactory way by using the elevation scanning mode. To improve the quality of liquid water content measurements in clouds the authors incorporate a sophisticated target classification scheme developed within the European cloud observing network CloudNet. It allows the detailed discrimination between different types of backscatterers detected by cloud radar and ceilometer. Finally, to allow IPT application also to drizzling cases, an LWC profiling method is integrated. This technique classifies the detected hydrometeors into three different size classes using certain thresholds determined by radar reflectivity and/or ceilometer extinction profiles. By inclusion into IPT, the retrieved profiles are made consistent with the measurements of the microwave profiler and an LWC a priori profile. Results of IPT application to 13 days of the LAUNCH campaign are analyzed, and the importance of integrated profiling for model evaluation is underlined.
publisherAmerican Meteorological Society
titleAdvances in Continuously Profiling the Thermodynamic State of the Boundary Layer: Integration of Measurements and Methods
typeJournal Paper
journal volume25
journal issue8
journal titleJournal of Atmospheric and Oceanic Technology
identifier doi10.1175/2007JTECHA961.1
journal fristpage1251
journal lastpage1266
treeJournal of Atmospheric and Oceanic Technology:;2008:;volume( 025 ):;issue: 008
contenttypeFulltext


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