观察到上海酸盐到酸盐可用性的下降
Skylar D Gerace1, Jun Yu1, J Keith Moore1
1Department of Earth System Science, University of California, Irvine 92697.
概括
海洋变暖加深了斯法克林,但没有尼特拉克林,影响了海洋营养素的可用性. 这表明未来的压力对植物浮游生物,影响海洋食物网和生物地球化学.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋生物地质化学海洋生物地质化学
- 气候变化影响 气候变化影响
背景情况:
- 气候变暖导致海洋分层的增加,可能减少上层海洋的营养供应.
- 这种营养减少可以降低海洋初级生产力,并破坏海洋食物网.
- 由于度低,直接观察表面海洋营养物质的变化是很困难的.
研究的目的:
- 建立营养线深度作为上海营养物质可用性和生产力的可靠指标.
- 通过分析营养线深度来评估营养素可用性的当代全球趋势.
- 通过地球系统模型模拟来研究影响营养趋势的机制.
主要方法:
- 使用全球数据库观察到的垂直酸盐和酸盐概况 (1972-2022) 量化了营养素深度.
- 分析了素 (P-营养素) 和素 (N-营养素) 深度的趋势.
- 利用地球系统模型 (ESM) 模拟来测试关于分层效应和营养循环的假设.
主要成果:
- 全球范围内,素主要在深化,特别是在南半球.
- 尼特拉克林在很大程度上显示稳定的趋势.
- 据ESM模拟显示,铁应力降低和固化增加,使得尼特拉克林能够缓冲分层,与斯法克林不同.
结论:
- 当代趋势表明,对海洋浮游植物来说,压力增加了,但压力并没有增加.
- 这些趋势预计将持续下去,对海洋生物地质化学有重大影响.
- 不同的营养压力将影响海洋食物网的动态和生态系统的功能.
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