Spatial variability of ocean fertilizing nutrients in the dust‐emitting ephemeral river catchments of Namibia

Dansie A.P.; Thomas D.S.G.; Wiggs G.F.S.; Munkittrick K.R.

摘要

Abstract >Research into global hot spots of dust emission has focused on exposed fine‐grained sediments in palaeo‐ or ephemeral dryland lake basins including Etosha (Namibia) and Makgadikgadi (Botswana) in southern Africa. Namibia's western ephemeral river valleys are also known to produce dust but have remained largely overlooked as a regionally significant source. Nutrient enrichment of valley sediments and proximity to the South Atlantic suggests aeolian dust could play an important role in ocean fertilization. The fertility of valley dust is dependent on fluvial sediments originating in the upper catchments on the Southern African Central Plateau. In this study we investigate climate, geology, vegetation and land use variability and how these may influence the nitrogen, phosphorus and iron availability in the catchments. We intensely sampled the Huab, Kuiseb and Tsauchab river systems to map the spatial distribution of nutrients from upper catchments to river termini. Samples were analysed for the bioavailable fractions of iron, nitrogen and phosphorus as well as total nitrogen and phosphorus. Results show that the lower valley reaches are sources of aeolian dust enriched in nutrients. Nitrogen levels correlate with precipitation and vegetation levels and phosphorus levels with geology. However, differences in upper catchment sediment nutrient levels were not representative of downstream nutrient differences between valleys. Rather, it is the hydrological and geomorphological processes of the ephemeral river systems that are key for producing the enriched sediments in the lower reaches. We demonstrate that the ephemeral river valleys of western Namibia are an extensive and enriched source of mineral dust that could play a critical role in marine productivity of the southern Atlantic. ? 2017 The Authors. Earth Surface Processes and Landf </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 xmlns =“http://www.wiley.com/namespaces/wiley”type =“main”xml：lang =“en”> <title type =“main”>抽象</ title> >研究全球尘埃排放的热点集中在古老的古代或短暂的旱地湖泊中暴露的细粒度沉积物，包括Etosha（纳米比亚）和南部的Makgadikgadi（博茨瓦纳）。纳米比亚的西方短暂的河谷也被称为产生灰尘，但仍然很大程度上被忽视为地区重要的来源。山谷沉积物的养分富集和南大西洋的邻近建议风暴尘埃可以在海洋施肥中发挥重要作用。山谷粉尘的肥力依赖于源自南非中部高原上部集水区的河流沉积物。在这项研究中，我们调查气候，地质，植被和土地利用变异性以及如何影响集水区中的氮气，磷和铁可用性。我们强烈地采样了Huab，Kuiseb和Tsauchab河系统，以将营养素的空间分布从上集水区映射到Termini河。分析样品的铁，氮和磷的生物可利用部分以及总氮和磷。结果表明，下谷达到营养成分的天气粉尘来源。氮水平与地质的沉淀和植被水平和磷水平相关。然而，上集水区沉积物营养水平的差异不是代表谷之间的下游养分差异。相反，它是短暂的河流系统的水文和地貌过程，这些过程是在下游产生富集沉积物的关键。我们表明西纳米比亚的短暂河谷是一种广泛而丰富的矿物粉尘来源，可以在大西洋南部的海洋生产力中发挥关键作用。还2017年作者。地球表面处理和Landf </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-22319/'>《Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group》</a> <b style="margin: 0 2px;">|</b><span>2018年第3期</span><b style="margin: 0 2px;">|</b><span>共16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=Dansie A.P.&option=202" target="_blank" rel="nofollow">Dansie A.P.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Thomas D.S.G.&option=202" target="_blank" rel="nofollow">Thomas D.S.G.;</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> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Munkittrick K.R.&option=202" target="_blank" rel="nofollow">Munkittrick K.R.;</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>School of Geography and the EnvironmentUniversity of OxfordOxford OX1 3QY UK;</p> <p>School of Geography and the EnvironmentUniversity of OxfordOxford OX1 3QY UK;</p> <p>School of Geography and the EnvironmentUniversity of OxfordOxford OX1 3QY UK;</p> <p>Canadian Rivers InstituteUniversity of New BrunswickSt John New Brunswick Canada;</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;"> <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=ocean fertilization&option=203" rel="nofollow">ocean fertilization;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Namibian ephemeral rivers&option=203" rel="nofollow">Namibian ephemeral rivers;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=sediment biogeochemistry&option=203" rel="nofollow">sediment biogeochemistry;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=river catchments&option=203" rel="nofollow">river catchments;</a> </p> <div class="translation"> 机译：尘埃来源;海洋施肥;纳米比亚短暂河流;沉积物生物地球化学;河流集水区; </div> </li> </ul> </div> </div> <div class="literature cardcommon" id="literaturereference" style="display:none"> <div class="similarity "> <h3 class="all_title" id="enpatent111">引文网络</h3> <div class="referencetab clearfix"> <ul id="referencedaohang"> <li dataid="referenceul">参考文献</li> <li dataid="citationul">引证文献</li> <li dataid="commonreferenceul">共引文献</li> <li dataid="commoncitationul">同被引文献</li> <li dataid="tworeferenceul">二级参考文献</li> <li dataid="twocitationul">二级引证文献</li> </ul> </div> <div class="reference_details" id="referenceList"> <ul id="referenceul"></ul> <ul id="citationul"></ul> <ul id="commonreferenceul"></ul> <ul id="commoncitationul"></ul> <ul id="tworeferenceul"></ul> <ul id="twocitationul"></ul> </div> </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/0704023139217.html">Spatial variability of ocean fertilizing nutrients in the dust‐emitting ephemeral river catchments of Namibia</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Dansie A.P.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Dansie A.P.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Thomas D.S.G.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Thomas D.S.G.,</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" class="tuijian_auth tuijian_authcolor">Wiggs G.F.S.,</a> <a href="/journal-foreign-22319/" target="_blank" rel="nofollow" class="tuijian_authcolor">Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group .</a> <span>2018</span><span>,第3期</span> </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：纳米比亚粉尘间隙河流域海洋施肥营养素的空间变异性</span> </p> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/academic-journal-foreign_journal-arid-environments_thesis/0204113674681.html">Effects of debris piles and pools along dry riverbeds on nutrients, microbial activity, and ground-dwelling arthropods: A Namibian ephemeral river case</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sanchez-Montoya M. 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