Collaborative Research: Southern Ocean Iron Experiments (SOFEX)

合作研究：南大洋铁实验（SOFEX）

• 批准号: 0000365
• 负责人: Frank Millero
• 金额: $ 50.58万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2003-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0000365&HistoricalAwards=false
• 关键词: Collaborative; Research; Southern; Ocean; Iron

ABSTRACTOCE-9911481, OCE-0000364, OCE-0000365, OCE-0000363, OCE-0000362, OCE-0000361In recent years, studies of dissolved iron in the ocean and the results of open-ocean iron enrichments experiments have demonstrated that the growth and biomass of phytoplankton are limited by low concentrations of available iron in waters characterized by high concentrations of dissolved nitrate and low standing stocks of chlorophyll ("HNLC waters"). The seminal open-water iron fertilization experiments were done in the early 1990's in the eastern equatorial Pacific Ocean. Since that time, abundant new evidence has come to light that an even more extensive, and globally significant, HNLS region exists in the broad eastwardly flowing Southern Ocean surrounding Antarctica.In this project, researchers at the Moss Landing Marine Laboratory, Rutgers University, Oregon State University, University of Miami, and Lamont-Dougherty Earth Observatory will perform an open-water iron fertilization experiment in the Southern Ocean in regions just north of and just south of the Antarctic Polar Frontal Zone (APFZ) along 170'W, an area characterized by high major nutrients and extremely low dissolved iron concentrations. The team will investigate (1) the role of iron on the biological pump in silicate-rich versus silicate-poor HNLC waters, (2) iron mediation of differential drawdown of major nutrients, (3) iron limitation of carbon fixation and export from surface waters, (4) the biophysical response to added iron, and (5) the potential effect of iron-induced carbon export on midwater remineralization and denitrification. The underlying hypothesis driving this field study is that the rate of phytoplankton production and the quantity of plant biomass in the Southern Ocean are differentially limited across the APFZ by iton and silicate availability during the major growth season and are responsible for the persistence of the HNLC condition. The results of this work are expected to contribute significantly to our understanding of important biogeochemical processes in the Southern Ocean. Factors that control the rate of new production bear directly on the global carbon cycle, atmospheric carbon dioxide concentration, and climate control.This Southern Ocean Iron Experiment (SOFeX), north and south of the APFZ, will be carried out in a single field expedition in the austral summer of 2001-2002.

Abstractoce-9911481，OCE-0000364，OCE-0000365，OCE-0000363，OCE-0000362，OCE-0000362，OCE-0000362，近年来对海洋中溶解的铁的研究，海洋中溶解的铁的研究且敞开的铁的富集在phytoplank的较高范围内，表现出了富含phytoplank的生长，这表明phytoplank的生长有限。溶解的硝酸盐浓度和叶绿素的低静态储备（“ HNLC水域”）。 开创性的开水铁施肥实验是在1990年代初期的赤道太平洋进行的。 Since that time, abundant new evidence has come to light that an even more extensive, and globally significant, HNLS region exists in the broad eastwardly flowing Southern Ocean surrounding Antarctica.In this project, researchers at the Moss Landing Marine Laboratory, Rutgers University, Oregon State University, University of Miami, and Lamont-Dougherty Earth Observatory will perform an open-water iron fertilization experiment in the Southern Ocean in regions just north of and在南极极性额叶区（APFZ）的南部沿170'W，该区域的特征是高主要营养物质和极低的溶解铁浓度。 The team will investigate (1) the role of iron on the biological pump in silicate-rich versus silicate-poor HNLC waters, (2) iron mediation of differential drawdown of major nutrients, (3) iron limitation of carbon fixation and export from surface waters, (4) the biophysical response to added iron, and (5) the potential effect of iron-induced carbon export on midwater remineralization and denitrification. 推动这项现场研究的基本假设是，浮游植物生产的速率和南大洋中的植物生物量在整个APFZ的限制在ITON和硅酸盐的主要增长季节都受到限制，并且负责HNLC条件的持久性。 这项工作的结果有望为我们对南大洋重要的生物地球化学过程的理解做出重大贡献。 控制新产量速率的因素直接在全球碳循环，大气二氧化碳浓度和气候控制上。该APFZ北部和南部的南方海洋铁实验（SOFEX）将在2001 - 2002年澳大利亚的一次野外探险中进行。