短期沉积物证据表明,在一个变暖的世界里,北极峡湾中的藻数量正在增加
Fu-Tao Fang1, Zhuo-Yi Zhu2, Fred Wenger3
1Key Laboratory of Polar Ecosystem and Climate Change, Ministry of Education; and School of Oceanography, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, China.
The Science of the total environment
|August 25, 2024
概括
由于冰川融化,北极峡湾的藻数量正在减少,但Krossfjorden显示藻数量增加和碳抽取. 这凸显了对北极碳捕获的各种反应和影响.
科学领域:
- 海洋生物地质化学海洋生物地质化学
- 古海洋学是古海洋学.
- 北极生态学 北极生态学
背景情况:
- 北极峡湾对于海洋碳埋葬至关重要,藻驱动生物碳.
- 全球变暖和冰川融化增加了峡湾的,减少了许多北极地区的藻丰富度.
- 斯瓦尔巴德峡湾表现出息地异质性,导致藻对冰川融化和改变碳循环的复杂反应.
研究的目的:
- 为了研究藻群落对冰川融化的复杂反应,在对比的斯瓦尔巴德峡湾上融化.
- 量化生物碳抽取和封存的变化,以应对环境变化.
- 确定控制藻丰富性的因素及其对北极碳反的影响.
主要方法:
- 分析了来自斯瓦尔巴德的Krossfjorden,Kongsfjorden和Gronfjorden的三个沉积物核心.
- 氨基酸分子指标,以评估有机物质降解.
- 福可桑丁和稳定同位素分析 (δ13C) 量化藻丰富性和碳抽取.
- 一维建模将冰川盆地地质与峡湾状况联系起来.
主要成果:
- 沉积物核心揭示了藻对冰川融化的明显反应,遍及研究的峡湾.
- 自20世纪80年代中期以来,Krossfjorden的藻数量持续增加,与的Kongsfjorden和Gronfjorden不同.
- 在Krossfjorden的二氧化增加与生物碳抽取增加了59%,这与其冰川盆地的硬岩地质有关.
- 在Kongsfjorden和Gronfjorden盆地的软岩地质与较低的藻丰度有关.
结论:
- 峡湾地质在很大程度上影响了藻对冰川融化的反应以及随后的生物碳抽取.
- 大约五分之一的斯瓦尔巴德峡湾,特别是那些有硬岩盆地的峡湾,可能仍然支持不断增加的藻种群和高效的碳排放.
- 北极海洋碳反机制需要细微的理解,考虑到峡湾特定的地质和冰川条件.
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