在过去的温暖气候期间,极地珊瑚礁扩张的轻度限制
A L Kruijt1, T Brachert2, A Sluijs1
1Department of Earth Sciences Faculty of Geosciences Utrecht University Utrecht The Netherlands.
Geophysical research letters
|November 25, 2024
概括
太阳辐射,不仅仅是温度,限制了珊瑚礁的扩张. 光强度和日长向极地减少,导致化在40度度以后减少,即使在温暖的气候下,也阻止了珊瑚礁向北发展.
科学领域:
- 古气候学 古气候学
- 海洋生物学 海洋生物学
- 地质化学 地质化学
背景情况:
- 由于温度限制,现代珊瑚礁仅限于热带水域 (全年超过16-18°C).
- 化石证据表明,珊瑚礁甚至在较温暖的代时期也没有超过50°度.
研究的目的:
- 调查太阳辐射在过去温暖的气候期间限制珊瑚礁向北极扩张的作用.
- 测试这样的假设:光线的可用性,而不是温度,决定了珊瑚礁的最大度分布.
主要方法:
- 开发和应用一种新的盒式模型,模拟浅海珊瑚的化.
- 分析光线强度和日长如何影响不同度的化速率.
主要成果:
- 在40度度以后,珊瑚的化率开始下降.
- 由于冬季光线减少和日长缩短,化率在50度度以后显著下降.
- 光线限制会影响化,不论阿拉贡石和度如何.
结论:
- 在温暖的气候下,太阳辐射,特别是光线的可用性,是珊瑚礁极向扩张的最终限制因素.
- 化石珊瑚礁分布是过去水温的不可靠指标.
- 珊瑚礁在50°度以外的广泛扩张并不是对未来气候变暖的可预测反应.
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