日本各地不同水系的聚集体大小分布表明,湍流会形成更强的聚集体

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-10-12 DOI:10.1002/lno.12686
Marika Takeuchi, Sarah L. C. Giering, Hidekatsu Yamazaki
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引用次数: 0

摘要

由各种颗粒组成的海洋聚集体在海洋碳储存中发挥着至关重要的作用。聚集体的总体粒度分布(粒度数谱)受聚集和分解过程之间平衡的控制。湍流可提高聚集体的碰撞率,有时甚至直接将聚集体撕裂,从而促进聚集和解聚。湍流驱动的主要过程通常取决于湍流程度--相对较弱的湍流与聚集有关,而较强的湍流则会促进解离。聚合体的强度也起着关键作用,因为粘结力强的聚合体能更好地承受湍流,从而降低解离率。虽然已经对湍流和聚集强度之间的关系进行了数值和实验研究,但实地测量仍然有限。在此,我们将日本各地不同环境下的实地测量结果与湍流强度进行了比较,以确定湍流对骨料强度的影响。我们综合了来自 10 个不同环境背景地点的测量结果,观察到随着湍流的增加,斜率会变得更平(净聚集率更高),交点长度也会发生变化,而强湍流通常与解离有关。我们的研究结果表明,在较强的湍流条件下会形成较强的聚集体,而强聚集体的总体数量也会随着湍流强度的增加而增加。我们还将数量大小谱与其他三个干扰因素(荧光、盐度和聚集体成分)进行了比较,以确认湍流的影响在聚集体动力学中占主导地位。
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Size distribution of aggregates across different aquatic systems around Japan shows that stronger aggregates are formed under turbulence
Marine aggregates, composed of various particles, play a crucial role in ocean carbon storage. The overall size distribution of the aggregates (number size spectra) is controlled by the balance between aggregation and disaggregation processes. Turbulence has been proposed to facilitate both aggregation and disaggregation by increasing the collision rate of aggregates or sometimes directly tearing them apart. Predominant processes driven by turbulence typically depend on the level of turbulence—relatively weak turbulence is associated with aggregation while stronger turbulence promotes disaggregation. Aggregate strength also plays a key role, as strongly bonded aggregates can withstand turbulence better, leading to lower disaggregation rates. While the relationship between turbulence and aggregate strength has been studied numerically and experimentally, field measurements remain limited. Here, we compare our number size spectra to turbulence intensity from the field measurements across different environmental settings around Japan to determine the effect of turbulence on aggregate strength. We combined measurements from 10 sites with different environmental settings and observed the flatter slopes (higher net aggregation rate) and shifts in the intersection lengths with an increase of turbulence, while strong turbulence is typically linked with disaggregation. Our findings suggested that stronger aggregates are formed under stronger turbulence and the overall population of strong aggregates also increases with an increase of turbulence intensity. We also compared our number size spectra with three other confounding factors (fluorescence, salinity, and aggregate compositions) to confirm the effects of turbulence are dominant in our aggregate dynamics.
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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