In this clip I will talk to you about the essential information concerning the tab surface in this tab you can specify options which will affect the interactions of the boundary layer with the surface several parameters within this tab make use of the location and time settings as they are explained within the clip tab read Geo Please be sure to watch the tab read Geo clip before watching this clip the tab surface consists of four sections in the upper left corner of your screen you can select surface scheme. In the upper right corner you can select surface layer. In the two lower sections the options related to the surface again can be specified these two lower sections become visible if you switch on surface scheme. With the first option you can choose the parameterization scheme that will be used to model was to model resistance the interaction with vegetation. With a second option you can select the vegetation type. For example if you have selected the Jarvis Stewart scheme for different vegetation types appears choices the model parameters that correspond to these vegetation types are given in the Tab advanced surface with a third option you can select the soil type. In class three soil types are included. You can find the characterizations of these soil types also within the tab advanced surface. The temperature and water content of the surface and the two layers soil types can also be specified. I will use a schematic here to explain the options for humidity. Here you can see the humidity profile in the atmospheric boundary layer and near the surface. First the humidity at the surface depends on the surface temperature ts. Secondly classic uses of force restore soil model with two layers. You can specify the initial soil moisture content for each of these layers by adjusting W. soil one for the upper five centimeters of soil. And W. soil two for the deeper layer if you select surface layer in the top right corner. You star is calculated instead of using the fixed value that is specified in the Tab wind class uses a logarithmic profile to adapt the temperature humidity and wind gradient close to the surface as displayed here in the figure to the right if you want to study the behavior of the wind in the atmospheric boundary layer you need to use the switch surface layer. In combination with the switch surface scheme. And the switch wind. Notice that this option only represents the physics of the surface layer the layer itself is not visible in the vertical profiles of the output data or graphs. Within this tab only the basics related to the surface can be specified for more advanced settings please refer to the clip tab advanced surface.