Biogeochemistry of lakes in the Mackenzie Delta

要求国家自然科学研究中心资助我正在进行的关于麦肯齐三角洲湖泊生物地球化学的北极研究。该项目自1991年以来一直在进行，并在过去的4年里得到了NSERC-DGP每年4万美元的支持。这项研究的长期目标是为麦肯齐三角洲的湖泊开发一个生物地球化学模型，并最终为世界主要河流的洪泛平原和三角洲开发一个更通用的生态系统模型，以促进评估全球变化对河流造成的多重压力的影响。麦肯齐三角洲包含45000个湖泊，是环极地北极地区主要河流三角洲中泛滥平原湖泊的代表，该地区的气候变化比其他任何地方都要快。未来5年的具体目标包括评估(1)三角洲食物网中溶解有机碳的来源和命运；(2)三角洲湖泊浮游生物异养型纳米鞭毛虫（HNAN）的食物网调控；(3)三角洲湖泊H2O2光化学生成和生物相容性doc；(4)三角洲湖泊水体细菌对光化学效应和高pH值的响应；(5)进一步研究三角洲对河流向波弗特海流出营养物的影响。我们对麦肯齐三角洲对河流流向波弗特的影响进行水力模拟的能力，对于模拟北冰洋对气候变暖和河流流入变化的反应至关重要，将通过国际极地年的资金来源独立进行。这些目标的成功取决于国家自然资源研究基金的可用性，以抵消在因努维克研究中心（拟议工作必不可少的设施）开展这项工作所产生的大量和不断增加的用户费用，以及前往这个北极地区的高昂旅行费用。符合NRS资助条件的总费用为每年34,900美元，否则将消耗该计划要求的大部分DGP资金。国家自然资源研究基金还将在未来5年内，为从事北极研究的高素质人才（包括2名博士和3名硕士学生以及5名实地助理）提供技术培训。

NRS funding is requested to support my on-going arctic research Biogeochemistry of Lakes in the Mackenzie Delta. This program has been on-going since 1991 and was supported (NSERC-DGP) during the past 4 yrs at $40k per yr.  The long-term goal of this research is to develop a biogeochemical model for lakes in the Mackenzie Delta, and ultimately, a more general ecosystem model for floodplains and deltas of major world rivers that will facilitate assessing the effects of multiple stresses on rivers resulting from global change. The Mackenzie Delta contains 45,000 lakes and is representative of floodplain lakes among major river deltas of the circumpolar arctic, a region of the world where climate is changing more rapidly than anywhere else. Specific goals during the next 5-yr term include assessing (1) sources and fates of dissolved organic carbon in delta foodwebs; (2) foodweb controls on plankton heterotrophic nanoflagellates (HNAN) in delta lakes; (3) photochemical production of H2O2 and biolabile-DOC in delta lakes; (4) responses of aquatic bacteria to photochemical effects and high pH in delta lakes; and (5) further work on delta effects on river nutrient outflow to the Beaufort Sea. Our capability to hydraulically model the effect of the Mackenzie Delta on riverine outflow to the Beaufort, crucial for modeling the response of the Arctic Ocean to climatic warming and changing river inflows, will be pursued independently via IPY funding sources. The success of these goals depend on availability of NRS funds to offset the substantial and increasing users fees associated with basing this work at the Inuvik Research Centre (facility essential for proposed work) and the high costs of travel to this arctic location. Total expenses eligible for NRS funding are $34,900 per yr, and would otherwise consume the majority of DGP funds requested for this program.  NRS funds will also contribute to expanded technical training of highly qualified personnel (including 2 PhD and 3 MSc students plus 5 field assistants through the next 5 years) in arctic-based research.