劳伦森五大湖内卫星衍生叶绿素的状态变化

IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Nikolay P. Nezlin , SeungHyun Son , Christopher W. Brown , Prasanjit Dash , Caren E. Binding , Ashley K. Elgin , Andrea VanderWoude
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引用次数: 0

摘要

1972年两国签订《五大湖水质协定》后,由于实施了营养物管理,劳伦森五大湖内的生态系统逐渐向低营养状态转变。在20世纪80年代末引入两种滤食性贻贝属入侵物种后,这种转变急剧加速。我们利用多卫星长期海洋颜色气候变化倡议(OC-CCI)数据集遥感地表叶绿素-a浓度(Chl-a)作为生态系统状态的代表,对这种转变的时空格局进行了详细分析。采用季节趋势分解(STL)和序贯t检验分析(STARS)相结合的综合方法,对覆盖大湖区大部分地区的25年(1997-2022)月度复合资料进行分析。结果确定了Chl-a在新的低营养状态下稳定的时间点、不同湖泊区域和深度的Chl-a下降幅度以及Chl-a的季节周期变化。在密歇根湖、休伦湖和安大略湖,制度转变的时间和规模以及春季浮游植物繁殖的消失表明,德莱森贻贝的存在是观察到的转变的主要驱动因素。我们证明OC-CCI数据集是一个可靠的信息来源,能够检测主要湖泊的这些状态变化,只有在不同时间段收集数据的不同卫星之间的偏差造成的不一致性的影响很小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Regime shifts in satellite-derived chlorophyll within the Laurentian Great Lakes
As a result of implementation of nutrient management following the binational Great Lakes Water Quality Agreement in 1972, the ecosystems within the Laurentian Great Lakes were gradually transforming to lower trophic regimes. This transformation dramatically accelerated in the late 1980s after the introduction of two invasive species of filter-feeding mussels of the genus Dreissena. We performed a detailed analysis of spatial and temporal patterns of this transformation using remotely sensed surface chlorophyll-a concentration (Chl-a) from the multi-satellite long-term Ocean Colour Climate Change Initiative (OC-CCI) dataset as a proxy of ecosystem state. We analyzed 25 years (1997–2022) of monthly composites covering most of the Great Lakes’ area detecting regime shifts in Chl-a employing an integrated approach combining Seasonal-Trend decomposition (STL) and Sequential T-test Analysis of Regime Shifts (STARS). The results identified the timings (shift points) when Chl-a stabilized at new lower trophic regimes, the magnitudes of Chl-a decrease across various lake regions and depths, and the changes in Chl-a seasonal cycles. In Lakes Michigan, Huron, and Ontario, the timings and magnitudes of regime shifts and vanishing of spring phytoplankton bloom suggest that dreissenid mussel presence was a primary driving factor of the observed transformation. We demonstrate that the OC-CCI dataset is a reliable source of information that enables the detection of these regime shifts in major lakes, with only minor effects of inconsistencies resulting from the biases between different satellites collecting data during different time periods.
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来源期刊
Journal of Great Lakes Research
Journal of Great Lakes Research 生物-海洋与淡水生物学
CiteScore
5.10
自引率
13.60%
发文量
178
审稿时长
6 months
期刊介绍: Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.
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