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Quantification of CO2 budget of atmosphere and ocean by two CO2 exchange models and analysis of global CO2 circulation

两种CO2交换模型定量大气和海洋CO2收支及全球CO2环流分析

基本信息

批准号：
15540423
负责人：
AKIYAMA Masatoshi
金额：
$ 1.15万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540423/
关键词：
Carbon dioxide CO2 flux Ocean-atmosphere CO2 exchange coefficient Total organic carbon Time series Remote sensing data リモートセンシング・データクロロフィルa リモートセンシングデータ全炭素フィードバック過程

项目摘要

Global warming has imposed an important impact on people activities at the present time. Carbon dioxide(CO2), one of the most important green house gases, is associated with air-sea gas exchange and global carbon circulation. The estimation of air-sea CO2 flux is very important in global carbon circulation and climate research. The flux of CO2 between the atmosphere and the ocean is estimated by the partial pressure of CO2(pCO2) difference multiplied by CO2 gas exchange coefficient which is one of the very important parameters in estimating air-sea CO2 flux. Several gas transfer models which calculates gas exchange coefficient have been proposed, but it is not easy to evaluate CO2 gas transfer models at the present time due to the difficulties of gas exchange coefficient measurement.In this study, we developed "Air-sea carbon dioxide exchange feedback model" to describe gas exchange processes caused at the air-sea interface, which can estimate the temporal variation of pCO2 in the seawater. As a result, typical CO2 exchange coefficients had accuracy of 1% within wind speed about 7-15m/s.Next, we analyzing the variation of the time series of the surface total CO2(TCO2) about the CO2 taken into an oceanic surface, we have made another one model of the "TCO2 variation analysis". According to this model, surface TCO2 change was able to be divided into the influence from CO2 flux from atmosphere and other influences that are the upwelling and the biological activities. In addition, we enhanced the model of the "TCO2 variation analysis" to global area. As a result, the variation of the surface TCO2 in global ocean is predominant of not air-sea CO2 flux from atmosphere and ocean, and it's value is about 2 (μmol/kg/month). In North hemisphere, it also tends to be domineering.

全球气候变暖对人类活动产生了重要影响。二氧化碳（CO2）是重要的绿色室内气体之一，与海气交换和全球碳循环密切相关。海气CO2通量的估算在全球碳循环和气候研究中具有重要意义。CO2气体交换系数是估算海-气CO2通量的重要参数之一，通过CO2分压差（pCO 2）乘以CO2气体交换系数来估算海-气CO2通量。目前已有几种计算CO2气体交换系数的气体传输模型，但由于CO2气体交换系数测量的困难，目前对CO2气体传输模型的评价并不容易，本研究开发了“海气CO2交换反馈模型”来描述海气界面上的气体交换过程，该模型可以估算海水中pCO 2的时间变化。结果表明，典型的CO_2交换系数在7- 15 m/s风速范围内的精度为1%。其次，我们分析了海面总CO_2（TCO_2）随海面吸收CO_2的时间序列的变化，建立了另一种“TCO_2变化分析”模型。根据该模型，表层TCO 2的变化可以分为大气CO2通量的影响和上升流和生物活动的影响。此外，我们还将“TCO 2变化分析”的模型扩展到全球范围。结果表明，全球海洋表层TCO_2的变化主要是大气和海洋的非海气CO_2通量的变化，其值约为2 μmol/kg/month。在北半球，它也倾向于盛气凌人。