速率引起的倾覆可引发浮游生物大量繁殖

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Anna Vanselow, Lukas Halekotte, Pinaki Pal, Sebastian Wieczorek, Ulrike Feudel
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引用次数: 0

摘要

浮游生物藻华是一种复杂的非线性现象,其发生可用 Truscott 和 Brindley(《数学生物学通报》,56(5):981-998, 1994 年)提出的双时间尺度(快慢)浮游植物-浮游动物模型来描述。在他们的研究中,他们观察到水温上升得足够快会导致浮游植物从低浓度到一次爆发的临界过渡:即所谓的浮游生物大量繁殖。然而,迄今为止,尚未发现导致观测到的过渡的动力学机制。利用几何奇异扰动理论的技术,我们发现了以前被忽视的速率敏感准阈值,该阈值由称为 "卡纳 "的特殊轨迹给出。从低浓度到高浓度的转变发生在这个对速率敏感的准阈值移动过浮游生物系统在某个狭窄的临界升温速率范围内的当前状态时。通过这种方式,我们将速率诱导的临界点确定为在很大程度上不可预测的浮游生物大量繁殖(如赤潮)或更普遍的有害藻类大量繁殖的基本动力学机制。我们的发现解释了之前报道的向单一浮游生物藻华的过渡,并使我们能够预测在更高的变暖速率下向一系列藻华的新型过渡。这可能是观测到的有害藻华发生频率增加的一种机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Rate-induced tipping can trigger plankton blooms

Rate-induced tipping can trigger plankton blooms

Plankton blooms are complex nonlinear phenomena whose occurrence can be described by the two-timescale (fast-slow) phytoplankton-zooplankton model introduced by Truscott and Brindley (Bulletin of Mathematical Biology 56(5):981–998, 1994). In their work, they observed that a sufficiently fast rise of the water temperature causes a critical transition from a low phytoplankton concentration to a single outburst: a so-called plankton bloom. However, the dynamical mechanism responsible for the observed transition has not been identified to the present day. Using techniques from geometric singular perturbation theory, we uncover the formerly overlooked rate-sensitive quasithreshold which is given by special trajectories called canards. The transition from low to high concentrations occurs when this rate-sensitive quasithreshold moves past the current state of the plankton system at some narrow critical range of warming rates. In this way, we identify rate-induced tipping as the underlying dynamical mechanism of largely unpredictable plankton blooms such as red tides, or more general, harmful algal blooms. Our findings explain the previously reported transitions to a single plankton bloom, and allow us to predict a new type of transition to a sequence of blooms for higher rates of warming. This could provide a possible mechanism of the observed increased frequency of harmful algal blooms.

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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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