Search for projects with tag "DOM"
[ID: 297] Gleon DOM seasons
PI: Andrew Tanentzap
Dissolved organic matter (DOM) is central to the functioning of lakes, but its molecular composition remains a “blackbox” at large spatial and temporal scales. This project aims to understand how the origin and composition of DOM varies through time using ultra-high-resolution mass spectrometry and its association with biogeochemical data collected from high-frequency sensors (e.g. dissolved oxygen, chlorophyll a, fDOM/CDOM). We are interested in collecting surface water samples at a monthly interval for 1 year from the deepest point in your study lakes. We will process all samples using a standardized protocol and make data freely available for reuse on a cloud server. Sampling will run between Jan 2021 and Dec 2021 with standardized consumables.
PI: Xudan Zhu
Globally, inland waters are at present delivering about 900 Million tons of Carbon (C) yr-1 to the oceans which is about 10% of the carbon C emissions from fossil fuels, and in addition, about 600 Million tons of C yr-1 are deposited as sediments in inland waters. Over the last years increasing dissolved organic matter (DOM) concentrations have been observed. This, so called, “Aquatic browning” has far-reaching consequences for ecology on a global scale, since it has major impacts on the global carbon C balance and water quality, but reasons for the observed brownification are still unclear (Hudson et al. 2003; Riise et al. 2012; Freeman et al. 2004). In the Nordic countries land use such as forest management practices (Kritzberg 2017) or drainage of peatlands also play an important role in increasing aquatic DOM concentration (Kortelainen and Saukkonen 1998; Nieminen 2004). Around 65% of the land area in Nordic countries is covered by forests of which up to 25% is on drained peatlands (Vasander et al. 2003). Ditch network maintenance (DNM) operations are needed to ensure the growth of trees on the otherwise waterlogged peat soils. However, this utilization of peatland forests causes additional pressure on water quality due to the risk of releasing large amounts of organic matter to freshwater ecosystems (O’Driscoll et al. 2018). Nutrients and organic matter transported in runoff and drainage water causes eutrophication which increases the oxygen consumption. Although the effects of brownification varies, it also often results in increased hypoxia and even anoxia.
PI: Tao Jiang
For this study, it is a part of a NSFC funding (National Science Foundation of China) beginning in 2020, to investigate the DOM characteristics and its biogeochemical reactivities in Three Gorges Reservoirs. We want to collected the samples from Krycklan catchment as an important reference because it represents a typical northern climate environment and boreal forest ecosystems. We will compare the DOM biogeochemistry and its biogeochemical characterstics from the two sites. The study will highlight the importance of DOM in the carbon cycle and environmental contaminant fates.