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Studies on oceanic CO2 uptake in and around Kuroshio

黑潮及其周边地区海洋二氧化碳吸收研究

基本信息

批准号：
16310001
负责人：
YOSHIKAWA Hisayuki
金额：
$ 9.28万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16310001/
关键词：
Carbonate system Kuroshio subtropical gyre Seasonal variation Long-term trend Net community production Bioloogical activity Carbon isotopic ratio 二酸化炭素分圧群集基礎生産親生物元素亜熱帯

项目摘要

In order to examine the oceanic CO_2 uptake and factors controlling it in and around Kuroshio, measurements of partial pressure of CO_2 (pCO_2), dissolved inorganic carbon (DIC), stable carbon isotopic ratio (^<13>C/^<12>C) of DIC were made at least four times a year in the western North Pacific Subtropical Gyre (NPSG) over the period from 2004 to 2006. In the NPSG, seasonal variation in pCO_2 was mainly controlled by the temperature and biological activity. The former was caused by the thermodynamic temperature effect on carbonate system. From winter to summer, the net community production was estimated to be in the range from 10 to 26 mmol m^<-2> day^<-1> based on measurements of concentration and ^<13>C/^<12>C of DIC. Dueto the oceanic uptake of anthropogenic CO_2, the pCO_2 in surface seawater has increased at a rate (1.6 μatm yr^<-1>) which is nearly equal to that of the air. In the western North Pacific (5-35°N, 132-142ー°E) the air-sea CO_2 flux over the 1990s was estimated to be in the range from 16 to 52 Mt-C yr^<-1> with a mean value of 32Mt-C yr^<-1>. During winter season, the CO_2 flux south of the Kuroshio was about 3 mole m^<-2> yr^<-1>, which was relatively large as compared with those of the average of the world ocean. We have also examined the relationship between chemical constituents of sinking particles and biological activity in the surface mixed layer. Further, we have developed a eco-system model including nitrogen isotope, and used it to discuss the nitrogen cycle in the equatorial Pacific and the Sea of Okhotsuk. Details of our results are given in scientific journals.

为了研究黑潮及其周边地区海洋CO2吸收及其控制因素，2004 - 2006年，每年至少4次在北太平洋副热带环流（NPSG）西部进行了CO2分压（pCO 2）、溶解无机碳（DIC）、DIC稳定碳同位素比（^<13>C/^<12>C）的测量。在NPSG中，pCO_2的季节变化主要受温度和生物活动的控制。前者是由碳酸盐体系的热力学温度效应引起的。从冬季到夏季，根据DIC浓度和^ C/^ C的测量，估计群落净生产量在10至26 mmol m^<-2>d ^<-1><13>之间<12>。由于海洋对人为CO_2的吸收，表层海水中pCO_2的增加速率（1.6 μatm·yr ~（-1）<-1>）与大气中的pCO_2的增加速率相当。在西北太平洋（5-35°N，132-142 °E），20世纪90年代海气CO_2通量的变化范围为16 - 52 Mt-C·yr^<-1>，平均值为32 Mt-C·yr^<-1>。冬季黑潮以南海域的CO_2通量约为3 mole·m ~（-1）·<-2>yr ~（-1<-1>），与世界大洋平均值相比，黑潮以南海域的CO_2通量相对较大。我们还研究了沉降颗粒的化学成分与混合层生物活动之间的关系。在此基础上，我们建立了一个包含氮同位素的生态系统模型，并利用该模型讨论了赤道太平洋和鄂霍次克海的氮循环。我们的研究结果的细节发表在科学期刊上。