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Dynamics of carbon dioxide uptake and nutrients in subtropical oceanic waters

亚热带海洋水域二氧化碳吸收和营养物动态

基本信息

批准号：
17510005
负责人：
KANDA Jota
金额：
$ 2.46万
依托单位：
Tokyo University of Marine Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17510005/
关键词：
subtropical ocean carbon dioxide nutrient continuous shipboard monitoring 表層モニタリング

项目摘要

Spatial variations of trace concentrations of nutrients and partial pressure of carbon dioxide (pCO_2) were compared for surface waters of the subtropical ocean. For this purpose, a pCO_2 monitoring system with high resolution of temporal variation was designed, and its performance was tested from 2005 through 2006. The developed system was carried onboard RAT Umitaka-maru of the Tokyo University of Marine Science and Technology, and surface monitoring in the subtropical waters was conducted during the period from 29 Nov to 14 Dec. in 2006, on a cruise leg from Tokyo to Sydney. Along with pCO_2 monitoring, the continuous observation of pH by colorimetric determination and the high-sensitive continuous flow analysis of nutrients were also performed. The pCO_2 showed variations of smaller spatial scales (〜tens of km), and these variations were categorized into three patterns. The first pattern accompanies decrease of temperature, increase of salinity, and increase of nutrient concentrations, which can be ascribed to enhanced vertical mixing and/or upwelling. The second pattern accompanies an extensive decrease of salinity and may reflect dilution of seawater by precipitation. The third and most frequently observed pattern was co-variation of pCO_2 and trace phosphate, which was presumably caused by biological activity

本文比较了亚热带海洋表层沃茨微量营养盐浓度和二氧化碳分压的空间变化。为此，我们设计了一套高分辨率的pCO_2监测系统，并在2005 - 2006年进行了性能测试。开发的系统搭载在东京海洋科学技术大学的RAT Umitaka-maru上，2006年11月29日至12月14日期间，在从东京到悉尼的巡航航程中对亚热带沃茨进行了表面监测。沿着pCO_2的监测，还进行了pH比色法的连续观测和营养盐的高灵敏连续流动分析。pCO_2在较小的空间尺度（几十km）上表现出明显的变化，这些变化可分为三种类型。第一种模式伴随着温度的降低，盐度的增加，和营养盐浓度的增加，这可以归因于增强的垂直混合和/或上升流。第二种模式伴随着盐度的广泛降低，可能反映了降水对海水的稀释。第三种也是最常见的模式是pCO_2和微量磷酸盐的共同变化，这可能是由生物活动引起的