Convective Interaction Between the Atmospheric Boundary Layer and the Surface

ATM-941167标准这项研究的目的是解释近地表的大气交换过程。由于边界层的厚度有限，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，并利用现有数据来研究这三个层面的交流过程。为了研究底部的过程，我们将研究对流热流在平静风条件下导致大量地面输送方面的作用。一个相关的应用是赤道西太平洋，那里的热通量和水汽通量对全球能量收支有很大贡献，但传统的阻力定律不能很好地解释这一点。热层还在表层和混合层之间形成了一个知之甚少的层，我们将用各种空中平台和风廓线来研究这一层。在非均匀地形上，边界层顶部不是水平的。这会在边界层中造成复杂的标度，并在对流云的形成中发挥主要作用。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.