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Chemical characterization of dissolved organic matter (DOM): A prerequisite for understanding UY-induced changes of DOM absorption properties and bioavailability

机译：溶解性有机物（DOM）的化学表征：了解UY诱导的DOM吸收特性和生物利用度变化的先决条件

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UV-induced transformations of colored dissolved organic matter (CDOM, which is part of dissolved organic matter, DOM) affect CDOM absorption properties resulting in the loss of color (referred to as photobleaching). CDOM photobleach-ing increases the penetration depths of the damaging UV-B radiation into water bodies and strongly depends on the wavelength of solar radiation and on the pH of aquatic systems. UV-induced transformations also affect DOM availability to bacterioplank-ton, often enhancing the bioavailability of terrigenous DOM and in turn microbial respiration. The combination of UV-induced enhancement of DOM bioavailability and increased export of terrigeneous DOM into estuaries and coastal waters due to climate-related changes in continental hydrology could result in a UV-mediated positive feedback of CO_2 accumulation in the atmosphere.rnThe extent and type of CDOM photobleaching and of UV-induced changes in DOM bioavailability depend on (C)DOM chemical composition, which in turn undergoes drastic changes upon UV-induced transformations. Therefore, the chemical characterization of (C)DOM is key for rationalizing UV-induced transformations. In the second section (after the "Introduction"), we review important methods for the elucidation of the chemical composition of (C)DOM. However, this article is not intended to be comprehensive regarding (C)DOM chemical characterization. An important purpose is to provide photochemical bases for the understanding of UV-induced changes of (C)DOM absorption properties and bioavailability (mainly discussed in the sections "Pathways of DOM phototransformations" and "UV-induced changes of the absorption properties of CDOM").
机译：紫外线诱导的有色溶解有机物（CDOM，它是溶解有机物的一部分，DOM）的转变会影响CDOM的吸收性能，从而导致颜色损失（称为光漂白）。 CDOM光漂白增加了破坏性的UV-B辐射进入水体的渗透深度，并且在很大程度上取决于太阳辐射的波长和水生系统的pH。紫外线诱导的转化也影响DOM对细菌浮游生物的利用，通常会增强陆源DOM的生物利用度，进而提高微生物的呼吸作用。紫外线诱导的DOM生物利用度提高和陆源水文学中气候相关变化引起的陆生DOM向河口和沿海水域出口增加的综合作用可能导致紫外线介导的大气中CO_2积累的正反馈。 CDOM光漂白的强度和紫外线引起的DOM生物利用度变化取决于（C）DOM化学成分，而化学成分又会因紫外线引起的转化而发生剧烈变化。因此，（C）DOM的化学表征对于合理化UV诱导的转变至关重要。在第二部分（“简介”之后），我们回顾了阐明（C）DOM化学成分的重要方法。但是，本文并非旨在全面介绍（C）DOM化学特征。一个重要的目的是提供光化学基础，以了解紫外线诱导的（C）DOM吸收性质和生物利用度的变化（主要在“ DOM光转化途径”和“紫外线引起的CDOM吸收性质的变化”部分中进行讨论） ）。

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