Report for methane monitoring in Arctic Lakes in Northwest Territories, Canada, August 2017

The primary goal of the August 2017 field program was the recovery of nine year-long OsmoSampler systems from eight lakes in the Mackenzie River delta and North Richards Island regions of the Northwest Territories of Canada. Secondary goals for the field program included collection of water and sediment samples from the same lakes, and deployment of new OsmoSampler systems in three of the same lakes, as well as new sites of interest in the Tuktoyaktuk region. Even despite poor weather in the outer delta and a cut line to an OsmoSampler, all sampling systems that were deployed in August 2016 were successfully recovered, as were sediment and water samples from the same lakes. These recoveries involved numerous small boat trips to Inuvik area lakes and three helicopter days (supported by collaborator Lance Lesack's PCSP award). New OsmoSamplers were deployed in three lakes: Lake 520 in the Inuvik area lakes, Swiss Cheese Lake in the outer delta, and North Head 1 lake at the northern most point of North Richards Island. An additional OsmoSampler was deployed in a deep hole by Scott Dallimore during operations off Tuktoyaktuk. During the field program, the team was joined by freelance journalist Laura Poppick to develop articles related to our Arctic research.2017年8月野外作业的核心目标为从加拿大西北地区马更些河三角洲与北理查兹岛区域的8个湖泊中，回收9台已部署满一年的OsmoSampler系统。本次野外作业的次要目标包括：从上述湖泊采集水样与沉积物样品，同时在其中3个原有湖泊以及图克托亚图克区域的新增候选点位部署全新的OsmoSampler系统。尽管外三角洲区域天气恶劣，且一台OsmoSampler的回收线缆受损，但2016年8月部署的所有采样系统均成功回收，对应湖泊的沉积物与水样也顺利采集完毕。本次回收工作多次搭乘小艇前往因纽维克区域的湖泊，还动用了3架次直升机（经费由合作者兰斯·莱萨克的PCSP奖资助）。研究团队在3个湖泊部署了全新的OsmoSampler系统：分别为因纽维克区域的520号湖、外三角洲的瑞士奶酪湖，以及北理查兹岛最北端的北角1号湖。另有一台OsmoSampler由斯科特·达利莫尔在图克托亚图克附近作业期间，部署于一处深水区点位。本次野外作业期间，自由撰稿人劳拉·波皮克加入团队，负责撰写与本次北极研究相关的报道。