Constraints on the adjustment of tidal marshes to accelerating sea level rise-猫眼课题宝

DOI：

10.1126/science.abo7872

发表时间：

2022-07

期刊：

Science

影响因子：

56.9

通讯作者：

中科院分区：

综合性期刊1区

文献类型：

作者：

N. Saintilan;K. Kovalenko;G. Guntenspergen;Kerrylee Rogers;J. Lynch;D. Cahoon;C. Lovelock;D. Friess;Erica L. Ashe;K. Krauss;N. Cormier;T. Spencer;J. Adams;J. Raw;C. Ibáñez;F. Scarton;S. Temmerman;P. Meire;T. Maris;K. Thorne;John Brazner;G. Chmura;Tony M. Bowron;V. P. Gamage;Kimberly A. Cressman;C. Endris;Cristina Marconi;P. Marcum;Kari A. St. Laurent;William Reay;K. Raposa;Jason A. Garwood;N. Khan

关于宝贵的潮汐沼泽生态系统对相对海平面上升的脆弱性，存在许多不确定性。以前的评估恢复海平面上升，沼泽地可以调整沉积物增加和海拔增益，显示对比的结果，根据当代或全新世地质数据。通过分析全球分布的当代数据，我们发现，沼泽沉积物的增加与海平面上升，似乎证实了先前声称的沼泽恢复力。然而，沉降的基板表现出非线性增加与增生。其结果是，沼泽海拔增益受到限制，海平面上升，赤字出现与全新世观测潮汐沼泽脆弱性是一致的。描述沼泽会上升还是下沉？沼泽生态系统易受海平面上升以及土地使用变化和其他人类活动的影响。研究表明，一些沼泽地正在上升，使它们对海平面上升具有显着的弹性;然而，结果因地点而异，并且在当代和全新世记录之间存在差异。Saintilan等人比较了来自四大洲97个地点的数据，发现沉积物堆积和沼泽沉降之间的关系解释了海平面上升的各种反应。沼泽会堆积更多的沉积物，在一定程度上与海平面上升保持一致，但沉积物沉降量会随着堆积量的增加而非线性地增加，因此，在海平面上升速度较高时，沼泽开始下沉。根据目前的气候变化预测，沼泽不太可能跟上海平面上升的速度。-BEL比较四大洲的沼泽海拔变化为沼泽对海平面上升的不同反应提供了解释。

Much uncertainty exists about the vulnerability of valuable tidal marsh ecosystems to relative sea level rise. Previous assessments of resilience to sea level rise, to which marshes can adjust by sediment accretion and elevation gain, revealed contrasting results, depending on contemporary or Holocene geological data. By analyzing globally distributed contemporary data, we found that marsh sediment accretion increases in parity with sea level rise, seemingly confirming previously claimed marsh resilience. However, subsidence of the substrate shows a nonlinear increase with accretion. As a result, marsh elevation gain is constrained in relation to sea level rise, and deficits emerge that are consistent with Holocene observations of tidal marsh vulnerability. Description Will marshes rise up or sink? Marsh ecosystems are vulnerable to rising sea level, in addition to land-use change and other human activities. Studies have shown that some marshes are gaining elevation, making them remarkably resilient to rising seas; however, results vary across locations and between contemporary and Holocene records. Comparing data from 97 sites on four continents, Saintilan et al. found that the relationship between sediment accretion and marsh subsidence explains the variable responses to sea-level rise. Marshes accrete more sediment, keeping up with sea-level rise up to a point, but sediment subsidence increases nonlinearly with accretion such that at higher rates of sea-level rise, marshes begin to sink. Marshes are unlikely to keep up with rising seas under current climate change projections. —BEL Comparing marsh elevation change across four continents provides an explanation for variable marsh responses to sea-level rise.

Constraints on the adjustment of tidal marshes to accelerating sea level rise

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