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Seasonal variability in chromophoric dissolved organic matter in the Sakawa River and Sagami Bay, Japan

机译：日本佐川河和相模湾的发色性溶解有机物的季节性变化

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摘要

We investigated the chromophoric dissolved organic matter (CDOM) of river water in the Sakawa River and of surface water in the vicinity of the river’s mouth in Sagami Bay, Japan, during the period from July 2003 to July 2004. Absorption by CDOM was modeled as a logarithmic function. As a qualitative index of CDOM, the slope (S) of this function was estimated for a wavelength range from 280 to 500 nm. As a quantitative index of CDOM, the integration of absorption was determined between 280 and 500 nm (Σ 280 500 a CDOM). High seasonal variability of S values was observed at the marine station. The S values at the upstream stations were related to chlorophyll a concentrations but not to bacterial abundance, whereas the integrated values at upstream stations were correlated with precipitation. Seasonal variability in the integrated values was low at the downstream stations, where the effect of effluent from nonpoint sources and sewage treatment plants was strong. Anthropogenic CDOM at the downstream stations appeared to be degraded by microbial utilization and photodegradation, whereas terrestrially derived CDOM at the upstream stations was less degraded. These qualitative differences in CDOM and the marked effect of dilution by seawater near the Sakawa River mouth suggest that the dynamics of CDOM in riverine and coastal environments should be studied with careful consideration of both spatial and temporal variations, particularly in small estuaries.
机译：我们调查了2003年7月至2004年7月期间日本佐川湾河水和河口附近地表水的发色溶解有机物（CDOM）。CDOM的吸收模型为对数函数。作为CDOM的定性指标，对于280至500 nm的波长范围，估计此函数的斜率（S）。作为CDOM的定量指标，在280至500 nm（Σ280 500 a CDOM ）之间确定了吸收积分。在海洋站观测到了S值的高季节性变化。上游站的S值与叶绿素a浓度有关，但与细菌丰度无关，而上游站的S值与降水量相关。在下游站，积分值的季节性变化很低，在下游站，来自非点源和污水处理厂的废水影响很大。下游站的人为源CDOM似乎由于微生物利用和光降解而降解，而上游站的陆生CDOM降解程度较小。这些CDOM的质性差异和佐川河口附近海水稀释的显着影响表明，应仔细考虑河流和沿海环境中CDOM的动态变化，尤其是在小河口地区。

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