Convective Interaction Between the Atmospheric Boundary Layer and the Surface

摘要ATM-941167 Stull 这项研究的目的是解释近地面的大气交换过程。 由于边界层具有有限的厚度，边界层底部、内部和顶部的过程相互作用以调节下一次交换。 我们将发展理论，收集新的现场数据，并利用现有的数据来研究这三个层次的交换过程。 为了研究底部的过程，我们将研究对流热气流在静风条件下引起大量表面输送的作用。 一个相关的应用是赤道西太平洋，热量和水分通量的贡献显着的全球能源预算，但传统的阻力定律没有很好地解释。 热气流也在表面层和混合层之间产生了一个不太清楚的层，我们将用各种机载平台和风廓线仪来研究。 在非均匀地形上，边界层顶部是不平坦的。 这导致边界层中复杂的缩放， 在对流云的形成中起着重要作用。 我们将用现场数据和理论来研究混合层顶部的水平度。

Abstract ATM-941167 Stull The objective of this research is to explain atmospheric exchange processes near the surface. Because the boundary layer has finite thickness, processes at the bottom, in the interior, and the top of the boundary layer interact to modulate the next exchange. We will develop theories, gather new field data, and utilize existing data to study exchange processes at these three levels. To investigate processes at the bottom, we will examine the role of convective thermals in causing substantial surface transport during calm wind conditions. A relevant application is to the equatorial western Pacific, where heat and moisture fluxes contribute significantly to the global energy budget, but which are not well explained by traditional drag laws. Thermals also create a poorly-understood layer between the surface- layer and the mixed layer, which we will study with a variety of airborne platforms and wind profilers. Over heterogeneous topography, the boundary-layer top is not level. This causes complex scalings in the boundary layer, and plays a major role in convective cloud formation. We will investigate the levelness of the mixed-layer top with field data and with theory.