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Colored dissolved organic matter (CDOM) is the optically measurable component of dissolved organic matter in water. Also known as chromophoric dissolved organic matter, yellow substance, and gelbstoff, CDOM occurs naturally in aquatic environments and is a complex mixture of many hundreds to thousands of individual, unique organic matter molecules, which are primarily leached from decaying detritus and organic matter. CDOM most strongly absorbs short wavelength light ranging from blue to ultraviolet, whereas pure water absorbs longer wavelength red light. Therefore, water with little or no CDOM, such as the open ocean, appears blue. Waters containing high amounts of CDOM can range from brown, as in many rivers, to yellow and yellow-brown in coastal waters. In general, CDOM concentrations a

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  • المواد العضوية الملونة الذائبة (ar)
  • Colored dissolved organic matter (en)
  • Coloration des matières organiques dissoutes dans l'eau (fr)
  • 有色可溶性有机物 (zh)
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  • المواد العضوية الملونة الذائبة (بالإنجليزي : CDOM) Colored dissolved organic matter))، هي المواد عضوية ذائبة في الماء يمكن قياس مكوناتها بصريا، تنتج بشكل طبيعي من تحلل المخلفات في البيئة المائية ولها قدرة امتصاص الضوء ذو الأطوال الموجية القصيرة بين الإشعاع الأزرق والأشعة الفوق بنفسجية بينما الماء النقي يمتص أطوال موجية أكبر مثل الضوء الأحمر، لذلك يبدو لون الماء النقي أزرق لأنه لايحتوي على مواد عضوية ملونة ذائبة بينما المياه الأخرى تبدو خضراء، أو أصفر مخضر وصولا إلى اللون البني وذلك حسب نسبة المواد الذائبة. (ar)
  • 有色可溶性有机物（CDOM，Colored dissolved organic matter），又称作可溶性有机发色团，或者粘质胶性溶解物。它是水中溶解的有机物的一种光学上可测量的成分。 CDOM通常出现在水环境中，主要由腐烂物质所释放的单宁酸所引起。CDOM在蓝色到紫外的短波波段有强烈的吸收光谱，而纯水在红色的长波波段有吸收，因此，不含或少含CDOM的水显示出蓝色。随着CDOM的增长，水体颜色逐渐过渡到绿色、黄绿色和褐色。 (zh)
  • Colored dissolved organic matter (CDOM) is the optically measurable component of dissolved organic matter in water. Also known as chromophoric dissolved organic matter, yellow substance, and gelbstoff, CDOM occurs naturally in aquatic environments and is a complex mixture of many hundreds to thousands of individual, unique organic matter molecules, which are primarily leached from decaying detritus and organic matter. CDOM most strongly absorbs short wavelength light ranging from blue to ultraviolet, whereas pure water absorbs longer wavelength red light. Therefore, water with little or no CDOM, such as the open ocean, appears blue. Waters containing high amounts of CDOM can range from brown, as in many rivers, to yellow and yellow-brown in coastal waters. In general, CDOM concentrations a (en)
  • On appelle coloration des matières organiques dissoutes dans l'eau la mesure optique de l'absorption de la lumière par ces matières. On utilise parfois l'expression de « substance jaune », le mot allemand « gelbstoff » et l'acronyme anglais CDOM (en anglais : colored dissolved organic matter) pour décrire les composés responsables de ce phénomène. L'utilisation du disque de Secchi est une autre manière d'évaluer la transparence de l'eau plus subjective, mais ne nécessitant qu'un appareillage simple et bon marché. (fr)
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  • المواد العضوية الملونة الذائبة (بالإنجليزي : CDOM) Colored dissolved organic matter))، هي المواد عضوية ذائبة في الماء يمكن قياس مكوناتها بصريا، تنتج بشكل طبيعي من تحلل المخلفات في البيئة المائية ولها قدرة امتصاص الضوء ذو الأطوال الموجية القصيرة بين الإشعاع الأزرق والأشعة الفوق بنفسجية بينما الماء النقي يمتص أطوال موجية أكبر مثل الضوء الأحمر، لذلك يبدو لون الماء النقي أزرق لأنه لايحتوي على مواد عضوية ملونة ذائبة بينما المياه الأخرى تبدو خضراء، أو أصفر مخضر وصولا إلى اللون البني وذلك حسب نسبة المواد الذائبة. (ar)
  • Colored dissolved organic matter (CDOM) is the optically measurable component of dissolved organic matter in water. Also known as chromophoric dissolved organic matter, yellow substance, and gelbstoff, CDOM occurs naturally in aquatic environments and is a complex mixture of many hundreds to thousands of individual, unique organic matter molecules, which are primarily leached from decaying detritus and organic matter. CDOM most strongly absorbs short wavelength light ranging from blue to ultraviolet, whereas pure water absorbs longer wavelength red light. Therefore, water with little or no CDOM, such as the open ocean, appears blue. Waters containing high amounts of CDOM can range from brown, as in many rivers, to yellow and yellow-brown in coastal waters. In general, CDOM concentrations are much higher in fresh waters and estuaries than in the open ocean, though concentrations are highly variable, as is the estimated contribution of CDOM to the total dissolved organic matter pool. (en)
  • On appelle coloration des matières organiques dissoutes dans l'eau la mesure optique de l'absorption de la lumière par ces matières. On utilise parfois l'expression de « substance jaune », le mot allemand « gelbstoff » et l'acronyme anglais CDOM (en anglais : colored dissolved organic matter) pour décrire les composés responsables de ce phénomène. Cette coloration jaune verdâtre provient des tannins produits par la décomposition des matières organiques. Ces matières absorbent fortement à des longueurs d'onde s'étalant du bleu à l'ultraviolet tandis que l'eau pure absorbe à des longueurs d'onde beaucoup plus longues, dans la gamme du rouge et de l'infrarouge. C'est la raison pour laquelle l'eau pure ne présentant pas de matières organiques dissoutes a une coloration bleue. En fonction de la concentration en CDOM, la couleur de l'eau varie du vert au jaune-vert et au brun. L'utilisation du disque de Secchi est une autre manière d'évaluer la transparence de l'eau plus subjective, mais ne nécessitant qu'un appareillage simple et bon marché. (fr)
  • 有色可溶性有机物（CDOM，Colored dissolved organic matter），又称作可溶性有机发色团，或者粘质胶性溶解物。它是水中溶解的有机物的一种光学上可测量的成分。 CDOM通常出现在水环境中，主要由腐烂物质所释放的单宁酸所引起。CDOM在蓝色到紫外的短波波段有强烈的吸收光谱，而纯水在红色的长波波段有吸收，因此，不含或少含CDOM的水显示出蓝色。随着CDOM的增长，水体颜色逐渐过渡到绿色、黄绿色和褐色。 (zh)
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