Under-estimated wave contribution to coastal sea-level rise
Under-estimated wave contribution to coastal sea-level rise
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DOI：
10.1038/s41558-018-0088-y
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发表时间：
2018-03-01
影响因子：
30.7
通讯作者：
Le Cozannet, Goneri
中科院分区：
文献类型：
--
作者：
Melet, Angelique;Meyssignac, Benoit;Le Cozannet, Goneri
沿海社区受到各种空间尺度的海平面变化的威胁;全球到区域的变化与冰川和冰盖损失以及海洋热膨胀有关，而较小的沿海尺度变化也与大气激增、潮汐和波浪有关。在这里，使用23年（1993-2015）的全球沿海海平面观测，我们研究了这些过程对长期海平面上升的贡献，到目前为止，相对较少探索。结果发现，波浪的贡献可以强烈地抑制或增强热膨胀和陆地冰损失对沿海水位变化的影响，在年际到几十年的时间尺度。例如，沿着美国西海岸，负波浪诱导趋势占主导地位，导致负净水位趋势。因此，对过去、现在和未来沿海海平面上升的准确估计需要考虑波浪建立和冲浪的低频贡献。
Coastal communities are threatened by sea-level changes operating at various spatial scales; global to regional variations are associated with glacier and ice sheet loss and ocean thermal expansion, while smaller coastal-scale variations are also related to atmospheric surges, tides and waves. Here, using 23 years (1993-2015) of global coastal sea-level observations, we examine the contribution of these latter processes to long-term sea-level rise, which, to date, have been relatively less explored. It is found that wave contributions can strongly dampen or enhance the effects of thermal expansion and land ice loss on coastal water-level changes at interannual-to-multidecadal timescales. Along the US West Coast, for example, negative wave-induced trends dominate, leading to negative net water-level trends. Accurate estimates of past, present and future coastal sea-level rise therefore need to consider low-frequency contributions of wave set-up and swash.