The Arctic Nearshore Turbidity Algorithm (ANTA) - A multi sensor turbidity algorithm for Arctic nearshore environments
The Arctic Nearshore Turbidity Algorithm (ANTA) - A multi sensor turbidity algorithm for Arctic nearshore environments
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DOI：
10.1016/j.srs.2021.100036
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发表时间：
2021-11
影响因子：
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通讯作者：
Konstantin P. Klein;H. Lantuit;B. Heim;D. Doxaran;B. Juhls;Ingmar Nitze;Daniela M. R. Walch;A. Poste;J. Søreide
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文献类型：
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作者：
Konstantin P. Klein;H. Lantuit;B. Heim;D. Doxaran;B. Juhls;Ingmar Nitze;Daniela M. R. Walch;A. Poste;J. Søreide
北极地区受气候变化的影响很大。气温升高导致永久冻土融化，海岸侵蚀和河流流量增加。这导致更多的沉积物和有机物进入沿海水域，这对生态系统产生了重大影响，因为它减少了通过水柱的光传输，改变了生物地球化学，但也改变了当地人民的生存经济，以及由于有机物转化为温室气体而导致的气候变化。然而，北极沿海和近岸水域悬浮泥沙的数量仍然不能令人满意，因为没有专门的算法来解决发生在海岸线附近的高负荷问题。在这项研究中，我们提出了北极近岸浊度算法(ANTA)，这是第一个专门针对北极近岸水域的反射率-浊度关系，通过来自加拿大北极西部赫谢尔岛奇基克塔鲁克近岸水域的现场测量进行调整。针对MODIS、哨兵3号(OLCI)、陆地卫星8号(OLI)和哨兵2号(MSI)等海洋颜色遥感相关传感器，以及较老的陆地卫星TM和ETM+传感器，建立了半经验模型。ANTA对Sentinel 2和Sentinel 3的应用与在斯瓦尔巴特群岛Adventfjorden采集的现场浊度样本相匹配，表明ANTA可以转移到Herschel岛以外的近岸地区。
The Arctic is greatly impacted by climate change. The increase in air temperature drives the thawing of permafrost and an increase in coastal erosion and river discharge. This leads to a greater input of sediment and organic matter into coastal waters, which substantially impacts the ecosystems by reducing light transmission through the water column and altering the biogeochemistry, but also the subsistence economy of local people, and changes in climate because of the transformation of organic matter into greenhouse gases. Yet, the quantification of suspended sediment in Arctic coastal and nearshore waters remains unsatisfactory due to the absence of dedicated algorithms to resolve the high loads occurring in the close vicinity of the shoreline. In this study we present the Arctic Nearshore Turbidity Algorithm (ANTA), the first reflectance-turbidity relationship specifically targeted towards Arctic nearshore waters that is tuned with in-situ measurements from the nearshore waters of Herschel Island Qikiqtaruk in the western Canadian Arctic. A semi-empirical model was calibrated for several relevant sensors in ocean color remote sensing, including MODIS, Sentinel 3 (OLCI), Landsat 8 (OLI), and Sentinel 2 (MSI), as well as the older Landsat sensors TM and ETM+. The ANTA performed better with Landsat 8 than with Sentinel 2 and Sentinel 3. The application of the ANTA to Sentinel 2 imagery that matches in-situ turbidity samples taken in Adventfjorden, Svalbard, shows transferability to nearshore areas beyond Herschel Island Qikiqtaruk.