Attenuation of photosynthetically active radiation and ultraviolet radiation in response to changing dissolved organic carbon in browning lakes: Modeling and parametrization
Attenuation of photosynthetically active radiation and ultraviolet radiation in response to changing dissolved organic carbon in browning lakes: Modeling and parametrization
复制标题
光合有效辐射和紫外线辐射的衰减响应褐宁湖中溶解有机碳的变化：建模和参数化
DOI：
10.1002/lno.11753
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发表时间：
2021
影响因子：
4.5
通讯作者：
Couture, Raoul‐Marie
中科院分区：
文献类型：
--
作者：
Pilla, Rachel M.;Couture, Raoul‐Marie
我们提出并评估了基于过程的湖泊模型 MyLake 的更新，其中包括光合有效辐射 (PAR) 和紫外线 (UV) 辐射波长的光衰减与溶解有机碳 (DOC) 变化之间的时变联系。在北美东北部和欧洲的许多地区，湖泊中的DOC迅速增加，导致水体透明度降低和光衰减增加。这些变化改变了垂直的光和热分布，从而影响了温度和溶解氧的垂直结构。我们使用此模型更新来测试 PAR 和 UV 衰减对 DOC 短期波动的响应性，并以吉尔斯湖（宾夕法尼亚州）的长期褐变测试为例。自 20 世纪 80 年代末以来，吉尔斯湖已显着变褐，三十年的详细经验数据表明，DOC 浓度增加了一倍多，随之而来的是 PAR 和紫外线衰减增加，表层水变暖，深水变冷，深水氧气消耗增加。我们发现，当这些系数直接响应湖内 DOC 浓度时，对于 PAR 和 UV 衰减的长期趋势，模型性能分别提高了 16% 和 52%。此外，此次更新后的模型更好地捕捉到了贾尔斯湖地表水变暖、深水变冷和深水氧耗竭的长期趋势，并且由于水透明度高和 DOC 低，该模型的变化速度非常快。因此，在湖泊模型中纳入 DOC 和光衰减之间的响应联系是了解长期湖泊褐变模式、机制和生态后果的关键。
We present and evaluate an update to the process‐based lake model MyLake that includes a time‐varying linkage between light attenuation of both photosynthetically active radiation (PAR) and ultraviolet (UV) radiation wavelengths to changes in dissolved organic carbon (DOC). In many parts of northeastern North America and Europe, DOC in lakes has rapidly increased, leading to reduced water transparency and increases in light attenuation. These changes alter the vertical light and heat distribution that affect vertical structuring of temperature and dissolved oxygen. We use this model update to test the responsiveness of PAR and UV attenuation to short‐term fluctuations in DOC and with a test case of long‐term browning at Lake Giles (Pennsylvania). Lake Giles has browned significantly since the late 1980s, and three decades of detailed empirical data have indicated more than a doubling of DOC concentrations, and consequent increases in PAR and UV attenuation, warming surface waters, cooling deep waters, and increasing deepwater oxygen depletion. We found that the model performance improved by 16% and 52% for long‐term trends in PAR and UV attenuation, respectively, when these coefficients respond directly to in‐lake DOC concentrations. Further, long‐term trends in surface water warming, deepwater cooling, and deepwater oxygen depletion in Lake Giles were better captured by the model following this update, and were very rapid due to its high water transparency and low DOC. Hence, incorporating a responsive link between DOC and light attenuation in lake models is key to understanding long‐term lake browning patterns, mechanisms, and ecological consequences.
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影响因子：
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