Characteristics and biogeochemical effects of oxygen minimum zones in typical seamount areas,Tropical Western Pacific
Characteristics and biogeochemical effects of oxygen minimum zones in typical seamount areas,Tropical Western Pacific
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热带西太平洋典型海山区含氧最低区特征及生物地球化学效应
DOI：
10.1007/s00343-021-0349-x
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发表时间：
2021
影响因子：
1.6
通讯作者：
Duan Liqin
中科院分区：
文献类型：
--
作者：
Wang Qidong;Song Jinming;Li Xuegang;Ma Jun;Yuan Huamao;Li Ning;Duan Liqin
海洋溶解氧（DO）含量的急剧下降是海洋变暖和层化加剧的一个严重后果，近年来引起了人们越来越多的关注。在开阔大洋中，DO含量的下降表现为海洋内部氧最小区（OMZs）的扩大。热带西太平洋（TWP）中层存在着广阔的OMZs，但很少引起人们的关注。本文重点研究了三个典型海山区的有机隔离带特征根据溶解氧的分布特征，三个海山区的有机隔离带在范围、厚度、海山有机隔离区特征的显著差异主要是因为它们所处的区域受不同的通风和消耗特征的影响。首次提出一个描述有机带强度的参数I_（OMZ），根据该参数，三个海山区有机带强度的大小顺序为Kocebu>M2> Y3。利用I_（OMZ）讨论了三个海山区有机带的潜在地球化学效应。I_（OMZ）越大，颗粒有机碳（POC）的降解越低。但由于数据有限，但是，如果这种关系在全球海洋中成立，那么在气候变暖和有机物隔离带扩大的情况下，海山的存在将促进POC的垂直迁移，从而增强生物泵的效率，这为定量研究有机物隔离带对生物泵效率的影响提供了一种新的途径.
As a serious consequence of ocean warming and increased stratification,a rapid decrease in dissolved oxygen(DO) content of the world's oceans has attracted more and more attention recently.In open oceans,the decline of DO is characterized by the expansion of oxygen minimum zones(OMZs) in the ocean interior.Vast OMZs exist within the mesopelagic zones of the Tropical Western Pacific(TWP),but have gained very little attention.In this study,we focus on characteristics of OMZs in three typical seamounts areas(named Y3,M2,and Kocebu,respectively) of the TWP.Based on distributions of DO,the OMZs of the three seamounts areas are very different in scope,thickness,and the minimum oxygen content.The significantly different characteristics of OMZs at the seamounts are mainly because they are located in regions affected by different ventilation and consumption characteristic.To quantitatively describe the intensity of OMZs,a parameter,I_(OMZ),is firstly proposed.According to this quantitative parameter,the intensity order of OMZs for the three seamounts areas is Kocebu>M2>Y3.Potential biogeochemical effects of OMZs in the three seamounts areas are discussed using I_(OMZ).With higher I_(OMZ),the degradation of particulate organic carbon(POC) tends to be lower.Yet because of the limited data,their relationship still need more research to prove.However,if this relationship holds in global oceans,the presence of seamounts would-under climate warming with expanding OMZs-promote vertical transport of POC resulting in an enhanced biological pump.Our study provides a new way to quantitatively study the impact of OMZs on the efficiency of biological pump.