Widespread distribution of allochthonous fluorescent dissolved organic matter in the intermediate water of the North Pacific
Widespread distribution of allochthonous fluorescent dissolved organic matter in the intermediate water of the North Pacific
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北太平洋中间水中异源荧光溶解有机物的广泛分布
DOI：
10.1016/j.pocean.2020.102510
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发表时间：
2021
影响因子：
4.1
通讯作者：
Ogawa Hiroshi
中科院分区：
文献类型：
--
作者：
Yamashita Youhei;Tosaka Tetsu;Bamba Rise;Kamezaki Ryuichi;Goto Shuji;Nishioka Jun;Yasuda Ichiro;Hirawake Toru;Oida Joji;Obata Hajime;Ogawa Hiroshi
可见光荧光溶解有机物(FDOM)，通常被定义为类腐殖质，分别作为生物难降解的溶解有机物和有机配体在海洋碳循环和铁循环中发挥重要作用。根据FDOM与中远洋(200-1000微米)和深海(1000微米)层的表观氧利用(AOU)之间的线性关系，开阔海洋中的FDOM的主要部分被认为是海洋来源(原生)。最近，Yamashita et al.(2020)根据一般FDOM-AOU关系的正偏差对异地FDOM进行了量化，发现源自鄂霍次克海的异地FDOM通过包括北太平洋中间水(NPIW)在内的中间水循环保守地输送到北太平洋西部。然而，来自白令海的异地FDOM的贡献尚未得到评估，白令海是NPIW的另一个源区。在这里，我们确定了包括鄂霍次克海和白令海在内的整个北太平洋异地FDOM的分布，以及整个北太平洋在NPIW密度范围内的异地FDOM的空间分布。我们发现，北部湾异地FDOM的主要源区是鄂霍次克海，而不是白令海，尽管北部湾下部的水团主要来自白令海。来自边缘海的异地FDOM的这种不同贡献可能是由于在沿海波尼亚形成的致密陆架水没有向白令海盆地地区扩张，并与具有强烈潮流的陆架沉积物相互作用。我们还证明，来自鄂霍次克海陆架沉积物的异地FDOM通过中间水的循环，特别是NPIW的上部，保守地分布到北太平洋的广大区域。此外，FDOM-AOU关系在深海层的负偏差在其他水团中也很明显，例如南极中间水，这表明FDOM可以帮助确定NPIW的时空分布及其与其他水团的混合。
Visible wavelength fluorescent dissolved organic matter (FDOM), usually defined as humic-like FDOM, plays important roles in marine carbon and iron cycles as biorefractory dissolved organic matter and organic ligands, respectively. The major fractions of FDOM in the open ocean have been considered to be of marine origin (autochthonous) according to linear relationships between FDOM and apparent oxygen utilization (AOU) in the mesopelagic (200–1000 m) and bathypelagic (>1000 m) layers. Recently, Yamashita et al. (2020) quantified allochthonous FDOM from the positive deviation of the general FDOM–AOU relationship in the bathypelagic layer and found that allochthonous FDOM derived from the Sea of Okhotsk was conservatively transported to the western North Pacific through the circulation of intermediate water, including North Pacific Intermediate Water (NPIW). However, the contribution of allochthonous FDOM from the Bering Sea, the other source region of NPIW, has not been evaluated. Here, we determined the distributions of allochthonous FDOM in the entire North Pacific, including the Sea of Okhotsk and the Bering Sea, and the spatial distribution of allochthonous FDOM in the density range of NPIW for the entire North Pacific. We found that the major source region of allochthonous FDOM in NPIW was the Sea of Okhotsk but not the Bering Sea, although the water mass contributing to the lower part of NPIW is known to be mainly derived from the Bering Sea. Such different contributions of allochthonous FDOM from the marginal seas are likely due to a lack of expansion of the dense shelf water, which forms at coastal polynya and interacts with shelf sediments with a strong tidal current, to the basin region of the Bering Sea. We also demonstrated that allochthonous FDOM derived from the shelf sediments of the Sea of Okhotsk was conservatively distributed to the wide area of the North Pacific through the circulation of intermediate water, particularly the upper part of NPIW. Furthermore, the negative deviations of the FDOM-AOU relationship in the bathypelagic layer were evident for other water masses, such as Antarctic Intermediate Water (AAIW), suggesting that FDOM can help determine the spatiotemporal distribution of NPIW and its mixing with other water masses, such as AAIW.
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影响因子：
2.3
作者：
Kawabe, Masaki;Fujio, Shinzou
通讯作者：
Fujio, Shinzou
影响因子：
5.2
作者：
J. Nishioka;T. Nakatsuka;Y. Watanabe;I. Yasuda;K. Kuma;H. Ogawa;N. Ebuchi;Alexey I. Scherbinin
通讯作者：
J. Nishioka;T. Nakatsuka;Y. Watanabe;I. Yasuda;K. Kuma;H. Ogawa;N. Ebuchi;Alexey I. Scherbinin
影响因子：
5.2
作者：
Taejin Kim;H. Obata;J. Nishioka;T. Gamo
通讯作者：
Taejin Kim;H. Obata;J. Nishioka;T. Gamo
日本海、白令海和北太平洋西部铁的垂直分布比较
影响因子：
--
作者：
H. Takata;K. Kuma;Shoei Iwade;Y. Isoda;H. Kuroda;T. Senjyu
通讯作者：
T. Senjyu
白令海和太平洋通过堪察加海峡进行水交换
DOI：
10.3103/s106837391003009x
发表时间：
2010
期刊：
影响因子：
--
作者：
I. Zhabin;V. Lobanov;S. Watanabe;M. Wakita;S. N. Taranova
通讯作者：
S. N. Taranova