Increasing hypoxia on global coral reefs under ocean warming-猫眼课题宝

DOI：

10.1038/s41558-023-01619-2

发表时间：

2023-03

期刊：

Nature Climate Change

影响因子：

30.7

通讯作者：

中科院分区：

地球科学1区

文献类型：

作者：

A. K. Pezner;T. Courtney;H. Barkley;W. Chou;H. Chu;Samantha M. Clements;Tyler J. Cyronak;M. DeGrandpre;S. Kekuewa;D. Kline;Yi-Bei Liang;T. Martz;S. Mitarai;Heather N. Page;M. S. Rintoul;J. Smith;K. Soong;Y. Takeshita;M. Tresguerres;Yi Wei;K. Yates;A. Andersson

据预测，海洋脱氧将威胁全球海洋生态系统。然而，目前和未来的氧气浓度以及珊瑚礁缺氧事件的发生仍未得到充分研究。在这里，利用自主传感器数据探索32个代表性珊瑚礁遗址的氧气变异性和缺氧暴露，我们发现缺氧在许多珊瑚礁上已经普遍存在。84%的珊瑚礁经历了弱至中度缺氧（≤153µmol O2kg−1至≤92µmol O2kg−1），13%经历了严重缺氧（≤61µmol O2kg−1）。在基于四种共享社会经济路径（ssp）的不同气候变化情景下，我们发现预测的海洋变暖和脱氧将增加缺氧的持续时间、强度和严重程度，到2100年，超过94%和31%的珊瑚礁分别经历弱至中度和重度缺氧，SSP5-8.5。由于氧气在生物功能和适应性中的关键作用，这种预计的氧气损失可能对珊瑚礁分类群产生负面影响。

Ocean deoxygenation is predicted to threaten marine ecosystems globally. However, current and future oxygen concentrations and the occurrence of hypoxic events on coral reefs remain underexplored. Here, using autonomous sensor data to explore oxygen variability and hypoxia exposure at 32 representative reef sites, we reveal that hypoxia is already pervasive on many reefs. Eighty-four percent of reefs experienced weak to moderate (≤153 µmol O2kg−1to ≤92 µmol O2kg−1) hypoxia and 13% experienced severe (≤61 µmol O2kg−1) hypoxia. Under different climate change scenarios based on four Shared Socioeconomic Pathways (SSPs), we show that projected ocean warming and deoxygenation will increase the duration, intensity and severity of hypoxia, with more than 94% and 31% of reefs experiencing weak to moderate and severe hypoxia, respectively, by 2100 under SSP5-8.5. This projected oxygen loss could have negative consequences for coral reef taxa due to the key role of oxygen in organism functioning and fitness.

Increasing hypoxia on global coral reefs under ocean warming

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