Studying dissolved organic carbon in tropical rivers of Malaysia using in-situ and satellite observations

利用现场和卫星观测研究马来西亚热带河流中的溶解有机碳

• 批准号: 407264719
• 负责人: Professor Dr. Justus Notholt
• 金额: --
• 依托单位: Leibniz-Zentrum für Marine Tropenforschung (ZMT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/407264719?language=en
• 关键词: Studying; dissolved; organic; carbon; tropical

Climate is intimately linked to the concentration of the greenhouse gas carbon dioxide (CO2) in the atmosphere. A priority amongst scientists worldwide is therefore to quantify fluxes of carbon within the Earth system, and to understand how mankind is altering these fluxes. Researchers have assessed terrestrial biomes (i.e. tropical forests, temperate forests, and boreal peatlands) as well as aquatic ecosystems (i.e. lakes and oceans), however very seldom connected both biomes or studied the pathway between the two, i.e. rivers. While peatlands only cover approximately 3% of Earth’s land area, they store a significant amount of carbon, and play an important role in the global carbon cycle. In the tropics, peat swamp forests and the underlying peat deposits constitute one of the largest near-surface reservoirs of organic carbon. South-East Asian peats contain ~70 Gt C, mostly on Sumatra and Borneo. The rivers draining these peatlands are very rich in DOC derived from peat: Indonesia alone may account for 10% of the global DOC flux, but this estimate is based on data from only two rivers. In South-East Asia, the land-to-ocean DOC flux may also have risen significantly following the recent conversion of peatlands for agriculture, but owing to the paucity of data here, this has not yet been properly confirmed. Both collaborators have pioneered studies on the release of greenhouse gases from peat-draining rivers in Borneo over the past 4 years. The proposed project will focus on establishing long-term measurements of dissolved organic carbon to quantify annual variations of DOC transport in a representative peat draining river in a region where many peatlands are being converted to agricultural lands. In an extension and complimentary to our ongoing work, we will include satellite remote sensing data to estimate the concentration of soil-derived organic carbon in larger coastal seas to cover the whole of Borneo. The proposed project involves two short visits by A/P Müller to the University of Bremen to install in-situ logger and analyse field data collected in autumn 2017 (WP1) and comparing it to satellite data at the University of Bremen (WP2). Following the first visit, two field expeditions will be conducted in Malaysia (before and after the next north-east monsoon in October 2018 and March 2019), followed by a second short visit by A/P Müller to the University of Bremen to consolidate collected data, finalise manuscript for publication, and discuss long-term continuation in person (WP3).

气候与大气中温室气碳（CO2）的浓度密切相关。因此，全世界的科学家的优先事项是量化地球系统中碳的通量，并了解人类如何改变这些通量。研究人员已经评估了陆生生物群落（即热带森林，温度森林和北方山峰）以及水生生态系统（即湖泊和海洋），但是很少与两者之间的途径相连或研究了两者之间的途径。尽管泥炭地仅占地土地面积约3％，但它们存储了大量碳，并在全球碳循环中起着重要作用。在热带，泥炭沼泽森林和下面的泥炭沉积物中，有机碳是最大的近地表水库之一。东南亚峰含有〜70 gt C，主要在苏门答腊和婆罗洲。排出这些泥炭地的河流非常丰富，源自泥炭的文档：仅印度尼西亚就可能占全球DOC FLUX的10％，但该估计基于仅来自两条河流的数据。在东南亚，在泥炭地转换为农业之后，土地到海洋的DOC Flux也可能显着上升，但由于这里的数据稀少，尚未得到适当的证实。两位合作者在过去的四年中均已开创研究从婆罗洲释放泥炭河流河流的温室气体的研究。拟议的项目将着重于建立溶解有机碳的长期测量，以量化代表性峰值排水河中DOC转运的年度变化，在该地区许多泥炭地转化为农业土地。在我们正在进行的工作的扩展和免费的范围内，我们将包括卫星遥感数据，以估算较大沿海海洋土壤来源的有机碳的浓度，以覆盖整个婆罗洲。拟议的项目涉及A/pMüller对不来梅大学进行两次短期访问，以安装原位记录仪并分析2017年秋季收集的现场数据（WP1），并将其与布雷蒙大学（WP2）的卫星数据进行了比较。首次访问后，将在马来西亚进行两次探险（2018年10月和2019年3月的下一个东北季风之前和之后），随后是A/PMüller对不来梅进行的第二次短暂访问，以合并收集到的数据，结局手稿，以进行出版，并进行长期延续（wp3）。