The LITFASS project of DWD and the LITFASS-98 experiment: The project strategy and the experimental setup
The LITFASS project of DWD and the LITFASS-98 experiment: The project strategy and the experimental setup
复制标题
DOI：
10.1007/s00704-002-0690-8
复制
发表时间：
2002-01-01
影响因子：
3.4
通讯作者：
Neisser, J
中科院分区：
文献类型：
--
作者：
Beyrich, F;Herzog, HJ;Neisser, J
德国气象局（DWD）的LITFASS项目（“林登贝格非均匀地形-大气与地表之间的通量：长期研究”）旨在开发和测试一种用于确定和参数化非均匀陆地表面上热量、动量和水蒸气的区域平均湍流通量的战略。这些通量将代表约10 * 10 km（2）的区域（而典型的斑块大小为10（-1）至10（0）km（2）），相对应于DWD目前运作的数值天气预报模式的网格单元大小。LITFASS由三个部分组成：非流体静力学微α尺度模式的发展（LITFASS局部模型- LLM），网格大小约为100 * 100 m（2），对林登堡气象台附近20 × 20 km 2范围内陆-气交换过程和边界层结构进行了实验研究，1998年6月，在LITFASS-98实地试验期间，对整个项目战略进行了为期三周的测试。本文介绍了LITFASS计划的概况、LITFASS-98实验的设计和测量方案以及实验期间的天气情况。结论制定的LITFASS测量概念的业务实现和未来的实地实验，旨在研究陆面-大气相互作用在林登贝格地区。从实验和建模活动中选择的结果在一系列的配套文件中提出，完成了这本杂志的特刊。
The LITFASS project ('Lindenberg Inhomogeneous Terrain - Fluxes between Atmosphere and Surface: a Longterm Study') of the Deutscher Wetterdienst (DWD, German Meteorological Service) aims to develop and to test a strategy for the determination and parameterisation of the area-averaged turbulent fluxes of heat, momentum, and water vapour over a heterogeneous land surface. These fluxes will be representative for an area of about 10 * 10 km(2) (while the typical patch size is between 10(-1) to 10(0) km(2)) corresponding to the size of a grid cell in the present operational numerical weather prediction model of the DWD.LITFASS consists of three components:the development of a non-hydrostatic micro-alpha-scale model (the LITFASS local model - LLM) with a grid-size of about 100 * 100 m(2),experimental investigations of land surface - atmosphere exchange processes and boundary layer structure within a 20 * 20 km(2) area around the Meteorological Observatory Lindenberg,the assimilation of a data base as an interface between measurements and modelling activities.The overall project strategy was tested over a three-week period in June 1998 during the LITFASS-98 field experiment. This paper gives an overview on the LITFASS project, on the design and measurement program of the LITFASS-98 experiment, and on the weather conditions during the period of the experiment. Conclusions are formulated for the operational realisation of the LITFASS measurement concept and for future field experiments aimed at studying the land surface - atmosphere interaction in the Lindenberg area. Selected results from both experimental and modelling activities are presented in a series of companion papers completing this special issue of the journal.