Assessing Landscape Dust Emission Potential Using Combined Ground‐Based Measurements and Remote Sensing Data

Holdt J. R. C.; Eckardt F. D.; Baddock M. C.; Wiggs G. F. S.

摘要

Abstract >Modeled estimates of eolian dust emission can vary by an order of magnitude due to the spatiotemporal heterogeneity of emissions. To better constrain location and magnitude of emissions, a surface erodibility factor is typically employed in models. Several landscape‐scale schemes representing surface dust emission potential for use in models have recently been proposed, but validation of such schemes has only been attempted indirectly with medium‐resolution remote sensing of mineral aerosol loadings and high‐resolution land surface mapping. In this study, we used dust emission source points identified in Namibia with Landsat imagery together with field‐based dust emission measurements using a Portable In‐situ Wind Erosion Laboratory wind tunnel to assess the performance of schemes aiming to represent erodibility in global dust cycle modeling. From analyses of the surface and samples taken at the time of wind tunnel testing, a Boosted Regression Tree analysis identified the significant factors controlling erodibility based on Portable In‐situ Wind Erosion Laboratory dust flux measurements and various surface characteristics, such as soil moisture, particle size, crusting degree, and mineralogy. Despite recent attention to improving the characterization of surface dust emission potential, our assessment indicates a high level of variability in the measured fluxes within similar geomorphologic classes. This variability poses challenges to dust modeling attempts based on geomorphology and/or spectral‐defined classes. Our approach using high‐resolution identification of dust sources to guide ground‐based testing of emissivity offers a valuable means to help constrain and validate dust emission schemes. Detailed determination of the relative strength of factors controlling emission can provide further improvement to regional and global dust cycle modeling. </abstra </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> > Eolian灰尘发射的建模估计可能因时空异质性而逐渐变化。排放。为了更好地限制排放的位置和大小，通常在模型中使用表面易用因子。最近提出了几种表示用于模型的表面粉尘发射电位的景观规模方案，但是验证了这种方案的验证仅是间接的矿物气溶胶载荷和高分辨率陆表面测绘的中分辨率遥感。在这项研究中，我们使用纳米比亚中识别的粉尘排放源点与土地物图像一起使用便携式内风侵蚀实验室风洞，以评估旨在代表全球灰尘周期建模中易蚀的方案的性能。。从风隧道测试时采集的表面和样品的分析，提升回归树分析确定了基于便携式风洞风蚀实验室粉尘测量和各种表面特征的蚀刻易用的重要因素，如土壤水分，颗粒尺寸，结痂和矿物学。尽管近期关注改善表面粉尘排放潜力的表征，但我们的评估表明在类似地貌类别中测量的助熔剂中的高度可变性。这种可变性基于地貌和/或光谱定义的类对粉尘建模尝试构成挑战。我们采用高分辨率识别灰尘来源的方法，以指导基于地基的发射率测试提供了有价值的方法，可以帮助限制和验证灰尘排放方案。详细测定控制排放的因素的相对强度可以进一步改善区域和全局粉尘周期建模。</ p> </ abstra </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-34664/'>《Journal of geophysical research. Earth Surface: JGR》</a> <b style="margin: 0 2px;">|</b><span>2019年第5期</span><b style="margin: 0 2px;">|</b><span>共19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=Holdt J. R. C.&option=202" target="_blank" rel="nofollow">Holdt J. R. C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Eckardt F. D.&option=202" target="_blank" rel="nofollow">Eckardt F. D.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Baddock M. C.&option=202" target="_blank" rel="nofollow">Baddock M. C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wiggs G. F. S.&option=202" target="_blank" rel="nofollow">Wiggs G. F. S.;</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>Department of Chemical EngineeringUniversity of Cape TownCape Town South Africa;</p> <p>Department of Environmental and Geographical ScienceUniversity of Cape TownCape Town South Africa;</p> <p>Geography and EnvironmentLoughborough UniversityLoughborough UK;</p> <p>School of Geography and the Environment Oxford University Centre for the EnvironmentUniversity of OxfordOxford UK;</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>TP79:P3; </span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dust emission&option=203" rel="nofollow">dust emission;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=PI‐SWERL&option=203" rel="nofollow">PI‐SWERL;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dust sources&option=203" rel="nofollow">dust sources;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=landscape&option=203" rel="nofollow">landscape;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=landform&option=203" rel="nofollow">landform;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Landsat&option=203" rel="nofollow">Landsat;</a> </p> <div class="translation"> 机译：尘埃发射;PI-SWIRL;尘埃来源;景观;地形;LANDSAT; </div> </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/0704025586714.html">Assessing Landscape Dust Emission Potential Using Combined Ground‐Based Measurements and Remote Sensing Data</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Holdt J. 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