权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Biogeochemical responses of the surface ocean and the lower atmosphere during the meso-scale iron enrichment experiments

中尺度铁富集实验中海洋表层和低层大气的生物地球化学反应

基本信息

批准号：
16201003
负责人：
TSUDA Atsushi
金额：
$ 32.28万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16201003/
关键词：
Ocean science Iron Diatom Bioaenic Bass Iron fertilization Water-mass tracking Dimethvl sulfide CO_2 sequestration 海洋生物生産

项目摘要

The Southern Ocean, the eastern equatorial Pacific and subarctic Pacific are recognized as HNLC (High Nutrient Low Chlorophyll) oceans, where depletion of iron is an limiting factor of primary production. Mesoscale iron-fertilization experiments have been conducted from 1993 to test the iron hypothesis and for future geoengineering as carbon sequestration. In the North Pacific, three experiments (SEEDS, SERIES and SEEDS II) have been carried out by A. Tsuda and his colleagues from 2001. This Grant-in-Aid supported the SEEDS II cruises, and detailed analysis and synthesis of other two experiments. Furthermore, preliminary bottle incubation experiments in which iron and phosphate were added, were carried out in the subtropical Pacific to test the feasibility of future mesoscale experiments. Data analysis and synthesis of these experiments have been done through a domestic workshop, domestic symposium, international workshop, international symposium, PICES-IFEP meeting and SOLAS-related m … More eetings. The main conclusion of our experiments is iron-fertilization to HNLC waters enhance the primary production but the magnitude of phytoplankton accumulation, the timing of the bloom and dominant phytoplankton species varies depending on the iron concentration, depth of surface mixed layer, zooplankton biomass and the season. More importantly, the efficiency of carbon sequestration by sinking of particulate matter was not high as what have been expected, because of respiration of microbial organisms. These results importantly affect on the formation of the international consensus that iron-fertilization is an immature technology as carbon sequestration. On the other hand, iron had almost no effect in the subtropical experiments, but these experiments contributed for the accumulation of the basic knowledge of the subtropical ecosystems and formed a groundwork of SOLAS-related project (Grant-in-Aid for Scientific Research on Priority Areas: Linkages in Biochemical Cycles between Surface Ocean and Lower Atmosphere). Less

南大洋、赤道东太平洋和亚北极太平洋被认为是高营养低叶绿素(HNLC)海洋，其中铁的枯竭是初级生产的限制因素。从1993年开始进行了中尺度的铁肥实验，以检验铁的假说，并为未来的地球工程提供碳封存。在北太平洋，A.Tsuda和他的同事们从2001年开始进行了三个实验(种子、系列和种子II)。该助学金资助了SEED II巡航，并对另外两个实验进行了详细的分析和综合。此外，在副热带太平洋进行了添加铁和磷酸盐的初步瓶培养实验，以检验未来中尺度实验的可行性。通过国内研讨会、国内研讨会、国际研讨会、国际研讨会、PICES-IFEP会议和与SOLAS相关的m…，对这些实验进行了数据分析和综合。更多的见面会。本实验的主要结论是，向HNLC水域施铁提高了初级生产力，但浮游植物的积累量、水华发生的时间和优势浮游植物种类随铁浓度、表层混合层深度、浮游动物生物量和季节的不同而不同。更重要的是，由于微生物的呼吸作用，颗粒物质下沉的固碳效率并不像预期的那样高。这些结果对国际共识的形成产生了重要影响，国际共识认为，与固碳一样，铁肥是一项不成熟的技术。另一方面，铁在亚热带实验中几乎没有影响，但这些实验有助于积累关于亚热带生态系统的基本知识，并构成了与海洋和大气研究有关的项目(优先领域科学研究补助金：表层海洋和低层大气之间生化循环的联系)的基础。较少