楚科奇海浮游植物大量繁殖期间的垂直碳输出:物理环境与锋面下沉

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Robert S. Pickart, Michael A. Spall, Frank Bahr, Loreley Lago, Peigen Lin, Astrid Pacini, Matthew Mills, Jie Huang, Kevin R. Arrigo, Gert van Dijken, Leah T. McRaven, Steven Roberts
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引用次数: 0

摘要

为了量化高纬度陆架的浮游生物-底栖生物耦合,必须确定浮游植物向沉积物输出的不同物理机制。2023 年 6-7 月,一个野外项目记录了楚科奇大陆架东北部冰下浮游植物大量繁殖的演变过程。在这里,我们利用巡航的现场数据、一个简单的数值模型、历史水柱数据和海洋再分析场来描述物理环境的特征,并描述与叶绿素藻华相关的动态驱动的叶绿素垂直输出。水团前沿将北部寒冷的高营养冬季水域和南部温暖的夏季水域分隔开来--与冰缘基本吻合--支撑着一个气压喷流,该喷流是向巴罗峡谷偏东的中央海峡流支的一部分。在整个巡航过程中,测量到一股高叶绿素荧光从冬季水域的近表层水华沿着前沿向下延伸。通过在模型中使用被动示踪剂来代表浮游植物,证明了羽流是由于锋面喷流的气压不稳定性引起的俯冲造成的。这一过程与重力下沉共同作用,将叶绿素向下泵送的速度比单独的重力下沉快一个数量级。利用海洋再分析场进行的粒子跟踪显示,远离锋面的叶绿素有很大一部分在到达海底之前就被平移出了楚科奇东北大陆架。这凸显了锋面俯冲过程将碳输送到海底的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Vertical Carbon Export During a Phytoplankton Bloom in the Chukchi Sea: Physical Setting and Frontal Subduction

Vertical Carbon Export During a Phytoplankton Bloom in the Chukchi Sea: Physical Setting and Frontal Subduction

In order to quantify pelagic-benthic coupling on high-latitude shelves, it is imperative to identify the different physical mechanisms by which phytoplankton are exported to the sediments. In June–July 2023, a field program documented the evolution of an under-ice phytoplankton bloom on the northeast Chukchi shelf. Here, we use in situ data from the cruise, a simple numerical model, historical water column data, and ocean reanalysis fields to characterize the physical setting and describe the dynamically driven vertical export of chlorophyll associated with the bloom. A water mass front separating cold, high-nutrient winter water in the north and warmer summer waters to the south—roughly coincident with the ice edge—supported a baroclinic jet which is part of the Central Channel flow branch that veers eastward toward Barrow Canyon. A plume of high chlorophyll fluorescence extending from the near-surface bloom in the winter water downwards along the front was measured throughout the cruise. Using a passive tracer to represent phytoplankton in the model, it was demonstrated that the plume is the result of subduction due to baroclinic instability of the frontal jet. This process, in concert with the gravitational sinking, pumps the chlorophyll downwards an order of magnitude faster than gravitational sinking alone. Particle tracking using the ocean reanalysis fields reveals that a substantial portion of the chlorophyll away from the front is advected off of the northeast Chukchi shelf before reaching the bottom. This highlights the importance of the frontal subduction process for delivering carbon to the sea floor.

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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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