High-resolution distribution and emission of dimethyl sulfide and its relationship with pCO2 in the Northwest Pacific Ocean
High-resolution distribution and emission of dimethyl sulfide and its relationship with pCO2 in the Northwest Pacific Ocean
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DOI：
10.3389/fmars.2023.1074474
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Shi‐Bo Yan;Xiao‐Jun Li;Feng Xu;Hong‐Hai Zhang;Jian Wang;Yueqian Zhang;Gui‐Peng Yang;G. Zhuang-G.-Z
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作者：
Shi‐Bo Yan;Xiao‐Jun Li;Feng Xu;Hong‐Hai Zhang;Jian Wang;Yueqian Zhang;Gui‐Peng Yang;G. Zhuang-G.-Z
海洋二甲基硫（DMS）因其对全球气候变化的影响而受到广泛关注。本研究旨在探讨西北太平洋DMS和pCO 2的分布特征、影响因素以及DMS和pCO 2之间的潜在关系。2019年11月期间，使用高分辨率的正在航行的船上测量设备来确定西北太平洋及其边缘海表层海水和大气的DMS和pCO 2。结果表明，大气和表层海水DMS浓度范围分别为3 ~ 125 pptv和0.63 ~ 2.28 nmol L-1，平均值分别为46 ± 19 pptv和1.08 ± 0.34 nmol L-1。平均海面pCO 2为371 ± 16 μatm（范围为332 - 401 μatm）。表层海水DMS在不同海流系统中的变化趋势主要与浮游植物的丰度和组成有关。生物活动和物理过程，如冷却共同影响海面pCO 2。沿西北太平洋样带沿着的冷涡使洋面DMS增加10%，CO2吸收增加3%。在0.1°分辨率下，西北太平洋DMS与pCO 2呈显著负相关（R2 = 0.569，P < 0.01）。整个调查区DMS和pCO 2的海-气通量估计为0.04 ~ 25.3 μmol m-2·d-1和-27.0 ~4.22 mmol m-2·d-1。西北太平洋，特别是亲潮海流，是CO2的重要汇和DMS的重要源。
Ocean-derived dimethyl sulfide (DMS) is widely concerning because of its hypothesized influence on global climate change. This study aims to explore the distribution characteristics and influencing factors of DMS and partial pressure of carbon dioxide (pCO2) in the Northwest Pacific Ocean, as well as the potential relationship between DMS and pCO2. A high-resolution, underway, shipboard measurement device was used to determine the DMS and pCO2 of the surface seawater and atmosphere in the Northwest Pacific and its marginal seas during November 2019. The result show that atmospheric and surface seawater DMS concentrations ranged from 3 to 125 pptv and 0.63 to 2.28 nmol L-1, respectively, with mean values of 46 ± 19 pptv and 1.08 ± 0.34 nmol L-1. The average sea surface pCO2 was 371 ± 16 μatm (range from 332 to 401 μatm). The trends in the surface seawater DMS in different current systems were primarily associated with phytoplankton abundance and composition. Biological activity and physical processes such as cooling jointly influenced the sea surface pCO2. A cold eddy along the transect in the Northwest Pacific Ocean increased DMS at the sea surface by 10% and CO2 uptake by 3%. We found a significant negative correlation between DMS and pCO2 in the Northwest Pacific Ocean at the 0.1° resolution [DMS]seawater = -0.0161[pCO2]seawater + 7.046 (R2 = 0.569, P < 0.01). The DMS and pCO2 sea-air fluxes were estimated to range from 0.04 to 25.3 μmol m-2·d-1 and from -27.0 to 4.22 mmol m-2·d-1 throughout the survey area. The Northwest Pacific Ocean, especially the Oyashio Current, is an important sink of CO2 and a source of DMS.