Biogeochemistry of lakes in the Mackenzie Delta

NRS的资金被要求支持我正在进行的北极研究生物地球化学的湖泊在麦肯齐三角洲。该计划自1991年以来一直在进行，并在过去4年中以每年4万美元的价格获得支持（NSERC-DGP）。 这项研究的长期目标是开发一个湖泊的地球化学模型在麦肯齐三角洲，并最终，一个更一般的生态系统模型的洪泛平原和世界主要河流的三角洲，这将有助于评估多重压力对河流的影响，导致全球变化。麦肯齐三角洲有45，000个湖泊，是北极圈主要河流三角洲中洪泛平原湖泊的代表，北极圈是世界上气候变化最快的地区。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归宿;（2）三角洲湖泊中浮游生物异养纳米鞭毛虫（HNAN）的食物网控制;（3）三角洲湖泊中H2 O2和生物不稳定性DOC的光化学产生;（4）三角洲湖泊中水生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流向博福特海的河流营养盐的影响。我们的能力，以水力模型的影响，麦肯齐三角洲河流流出到博福特，关键是模拟北冰洋的气候变暖和变化的河流流入的反应，将独立追求通过IPY的资金来源。这些目标的成功取决于国家遥感中心资金的可用性，以抵消与将这项工作设在因纽维克研究中心（拟议工作的必要设施）有关的大量和不断增加的用户费用以及前往这一北极地区的高昂费用。符合NRS资助条件的总费用为每年34，900美元，否则将消耗该计划所需的大部分DGP资金。 NRS的资金还将有助于扩大对北极研究方面高素质人员的技术培训（包括2名博士和3名硕士学生，以及未来5年的5名现场助理）。

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.