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首页> 外文期刊>Estuarine Coastal and Shelf Science >Influence of severe drought conditions on chromophoric dissolved organic matter dynamics in south Texas coastal waters
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Influence of severe drought conditions on chromophoric dissolved organic matter dynamics in south Texas coastal waters

机译:严重干旱条件对德克萨斯州南部沿海水域发色性溶解有机物动力学的影响

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We investigated chromophoric dissolved organic matter (CDOM) dynamics in response to the severe drought conditions of 2009 in the Aransas-Copano (AC) Bay complex and adjacent nearshore Gulf of Mexico (GoM) along the southern Texas (USA) coast. Surface water absorption coefficients (α_(305) in m~(-1)) were measured daily at the University of Texas at Austin Marine Science Institute (UTMSI) pier located at the interface between the AC complex and the GoM. From June to August 2009, 0305 averaged 0.81 ± 0.31 m~(-1) compared to 1.20 ± 0.70 m~(-1) during summer of 2008 (June-August) and 1.84 ± 0.34 m~(-1) during summer 2007 (non-drought year). Despite negligible freshwater input to the AC system for most of 2009, mean α_(305) values for AC Bay sites were similar in 2008 and 2009, ranging from 3.24 ± 0.60 m~(-1) in the lower estuary to 6.22 ± 0.55 m~(-1) in the upper estuary during summer 2009, and 3.15 ± 0.38 m~(-1) to 6.81 ± 0.73 m~(-1) during summer 2008 (no data for 2007). CDOM photobleaching experiments were performed using a SunTest XLS + solar simulator with an irradiation spectrum that closely matches solar UV at subtropical latitudes. AC Bay samples exhibited α_(305) photobleaching half-lives of 33-48 h, while GoM samples exhibited α_(305) photobleaching half-lives of 36-89 h. We estimate that summertime photobleaching may reduce CDOM levels by >50% in the AC bay complex before discharge into the GoM and by up to 25% more throughout the nearshore waters along the western GoM shelf.
机译:我们调查了发色溶解性有机物(CDOM)的动态变化,以响应2009年Aransas-Copano(AC)海湾综合体和德克萨斯州南部(美国)海岸附近的墨西哥湾近海(GoM)的严重干旱情况。每天在位于AC复合体和GoM之间的界面的德克萨斯大学奥斯汀海洋科学研究所(UTMSI)码头测量地表水吸收系数(α_(305)单位为m〜(-1))。从2009年6月至2009年8月,0305的平均值为0.81±0.31 m〜(-1),而2008年夏季(6月至8月)的平均值为1.20±0.70 m〜(-1),2007年夏季的平均值为1.84±0.34 m〜(-1) (非干旱年份)。尽管2009年大部分时间向交流系统输入的淡水微不足道,但2008年和2009年交流海湾站点的平均α_(305)值相似,范围从下河口的3.24±0.60 m〜(-1)到6.22±0.55 m 2009年夏季在上河口的〜(-1),2008年夏季在3.15±0.38 m〜(-1)至6.81±0.73 m〜(-1)(2007年无数据)。使用SunTest XLS +太阳模拟器进行CDOM光漂白实验,该太阳模拟器的辐射光谱与亚热带纬度的太阳紫外线非常匹配。 AC Bay样品的α_(305)光漂白半衰期为33-48小时,而GoM样品的α_(305)光漂白半衰期为36-89小时。我们估计,夏季的光致漂白可能会使AC海湾综合体中的CDOM含量降低50%以上,然后再排放到GoM中,而整个GoM西部沿海水域的CDOM含量最多降低25%。

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