Light Intensity, Nutrient, and pCO2 Controls on Boron Isotope Fractionation in Laboratory Cultured Corals

光强度、营养物和 pCO2 对实验室培养珊瑚硼同位素分馏的控制

• 批准号: 0083061
• 负责人: N. Gary Hemming
• 金额: $ 19.03万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0083061&HistoricalAwards=false
• 关键词: Light; Intensity; Nutrient; pCO2; Controls

ABSTRACTOCE-0083061Boron isotopes, sensitive to the carbonate system, may be an important tool in understanding coral chemistry and has the intriguing possibility of tracking changes in pCO2, whether it be global changes over long time scales or a record of internal 'carbon pool' conditions mediated by the coral itself. For this reason, the PI will determine the boron isotopic composition for two separate sets of cultured coral samples to increase our knowledge on the uptake and fractionation of boron isotopes. One suite of coral samples cultured under controlled light intensity and nutrient conditions will address whether the interpretation of observed seasonal variation in the boron isotopic composition of a natural coral is correct. The second set of corals grown under specified temperature and pCO2 levels, will address the influence of these two parameters on the boron isotopic composition, as well as specifically answer the question as to whether boron isotopes in corals can be used as a paleo-pH proxy. The potential application of boron isotopes as a proxy for pH may provide further insights into our understanding of global changes in pCO2 over glacial/interglacial time scales, and thus ocean-atmosphere interactions and global climate change.

硼同位素对碳酸盐系统敏感，可能是了解珊瑚化学的重要工具，并且具有跟踪pCO2变化的有趣可能性，无论是长期尺度上的全球变化还是珊瑚自身介导的内部“碳池”条件的记录。 因此，研究所将分别测定两组养殖珊瑚样品的硼同位素组成，以增加我们对硼同位素的吸收和分馏的认识。 一套珊瑚样本的控制光照强度和营养条件下培养将解决是否观察到的天然珊瑚的硼同位素组成的季节性变化的解释是正确的。 第二组在特定温度和pCO2水平下生长的珊瑚将解决这两个参数对硼同位素组成的影响，并具体回答珊瑚中的硼同位素是否可以用作古pH值代理的问题。 硼同位素作为pH值代理的潜在应用可能会为我们了解全球pCO2在冰期/间冰期时间尺度上的变化提供进一步的见解，从而了解海洋-大气相互作用和全球气候变化。