Large Eddies Regulate Turbulent Flux Gradients in Coupled Stable Boundary Layers

Lan Changxing; Liu Heping; Katul Gabriel G.; Li Dan; Finn Dennis

摘要

Abstract >Due to strong mean wind shear, the stable boundary layer (SBL) becomes vertically coupled. In a coupled SBL, large turbulent eddies enhance cross‐layer mixing and vertically mix turbulent kinetic energy. However, large gradients in momentum and heat fluxes are frequently observed, degrading the performance of Monin‐Obukhov similarity theory. It is shown that increased vertical gradients of mean variables (i.e., wind speed and potential temperature) can cause flux gradients. This process is operated upon by downward penetrating large eddies with altered phase difference, contributing unevenly to fluxes and thus causing flux gradients. In the coupled SBL with small gradients in mean variables, large eddies are vertically synchronized, contributing evenly to fluxes across layers and thus causing small flux gradients. As turbulent production becomes weak and the cross‐layer difference in turbulent flux transport increases, large eddies become less vertically synchronized, contributing unevenly to fluxes across layers and thus causing large flux gradients. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“Main”XML：Lang =“en”> <标题类型=“main”>抽象</ title> >由于强平均风剪切，稳定的边界层（SBL）变得垂直耦合。在耦合的SBL中，大湍流射频增强了横梁混合和垂直混合湍流动能。然而，经常观察到动量和热量通量的大梯度，降低了Monin-Obukhov相似性理论的性能。结果表明，增加平均变量的垂直梯度（即风速和潜在温度）可以导致通量梯度。通过向下穿透的大漩涡进行该过程，具有改变的相位差，促成不均匀的通量，从而导致通量梯度。在具有平均变量的小梯度的耦合SBL中，大涡点垂直同步，均匀地在层上均匀递增，从而导致小的磁通梯度。由于湍流产生变弱，湍流通量传输的横向差异增加，大漩涡变得垂直同步，横跨层的通量不均匀，从而导致大量通量梯度。</ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2019年第11期</span><b style="margin: 0 2px;">|</b><span>共11页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lan Changxing&option=202" target="_blank" rel="nofollow">Lan Changxing;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Liu Heping&option=202" target="_blank" rel="nofollow">Liu Heping;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Katul Gabriel G.&option=202" target="_blank" rel="nofollow">Katul Gabriel G.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Li Dan&option=202" target="_blank" rel="nofollow">Li Dan;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Finn Dennis&option=202" target="_blank" rel="nofollow">Finn Dennis;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Laboratory for Atmospheric Research Department of Civil and Environmental EngineeringWashington State UniversityPullman WA USA;</p> <p>Laboratory for Atmospheric Research Department of Civil and Environmental EngineeringWashington State UniversityPullman WA USA;</p> <p>Nicholas School of the EnvironmentDuke UniversityDurham NC USA;</p> <p>Department of Earth and EnvironmentBoston UniversityBoston MA USA;</p> <p>NOAA Air Resources LaboratoryIdaho Falls ID USA;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> </p> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704019853057.html">Large Eddies Regulate Turbulent Flux Gradients in Coupled Stable Boundary 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<span> 中国专利： CN1246716A </span> <span> . 2000-03-08</span> </div> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/patent-detail/06120200339553.html">大磁隙强磁场高梯度高稳定度永磁式磁机构</a> <b>[P]</b> . <span> 中国专利： CN2340068Y </span> <span> . 1999.09.22</span> </div> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/patent-detail/06130450062063.html">Laminar boundary flow control device for turbulent gas flow e.g. for heat exchanger or electrofilter, uses adjustable piston for providing shock variation in flow velocity in laminar boundary layer</a> <b>[P]</b> . <span> 外国专利：  DE19844490A1 </span> <span> . 2000-04-27</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：用于湍流气流的层流边界流控制装置，例如用于热交换器或电过滤器，使用可调节活塞以提供层流边界层中流速的冲击变化 </span> </p> </li> <li> <div> <b>4. </b><a class="enjiyixqcontent" href="/patent-detail/06130501013902.html">Turbulent boundary layer modeling via incorporation of pressure gradient directional effect</a> <b>[P]</b> . <span> 外国专利：  US11188692B2 </span> <span> . 2021-11-30</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：压力梯度方向效应掺入湍流边界层建模 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130501002042.html">Turbulent boundary layer modeling via incorporation of pressure gradient directional effect</a> <b>[P]</b> . <span> 外国专利：  US11188692B2 </span> <span> . 2021-11-30</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：压力梯度方向效应掺入湍流边界层建模 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" id="enpatent55">相关主题</h3> <ul id="subject"> </ul> </div> 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