Collaborative research: Warming and irradiance measurements in the Arctic: Determining the link between solar energy absorption and surface warming through long term observations

拟议研究的目标是量化北极地表水域季节性变暖与太阳能吸收之间的联系，并确定导致这种吸收的物质的存在和季节循环。一种新的概念验证浮标系统将以高时间分辨率(每小时)测量海冰和水柱上部30米内太阳辐射衰减的季节变化。温度和PAR(光合作用有效辐射)辐照度将使用光学传感器与水柱和海冰中的热敏电阻配对进行测量。将使用荧光计对地表水中的叶绿素、有色溶解有机物质(CDOM)和光后向散射进行量化。这些传感器将被用来计算冰和水柱内的扩散衰减系数(Kd)，并确定浮游植物和冰下CDOM的季节性循环。这些光学观测和温度观测之间的关系将使人们能够限制北极供暖收支的每日水柱吸收部分。这一概念的最终目标是在整个北极建立一个浮标网络，无论是在冰盖的水域还是在开阔的水域。该工作计划包括在多年冰中部署几次，包括在早春部署波弗特环流和Geomistion冰基地。这个地点的数据将通过在营地期间进行的额外测量以及其他地球观测项目的补充研究而得到补充。结果将通过与科学联盟现场直播合作、在极地科学周末以及华盛顿大学的课程中传播。浮标数据也将在项目网站上近乎实时地可视化。所有数据将在1年内提交给CADIS。

The objectives of the proposed research are to quantify the connection between seasonal warming of arctic surface waters and the absorption of solar energy, and additionally to identify the presence and seasonal cycling of materials responsible for this absorption. Seasonal changes in the attenuation of solar radiation within the sea ice and upper 30m of the water column will be measured at high temporal resolution (hourly) by a new proof of concept buoy system. Temperature and PAR (photosynthetically active radiation) irradiance measurements will be made using optical sensors paired with thermisters within the water column and sea ice. A fluorometer will be used to quantify chlorophyll, colored dissolved organic material (CDOM) and light backscattering within surface waters. These sensors will be used to calculate diffuse attenuation coefficients (Kd) within the ice and water column, and to determine the seasonal cycling of phytoplankton and CDOM under the ice. The relationship between these optical and temperature observations will enable one to constrain the daily water column absorption component of the Arctic heating budget. The ultimate goal of this concept would see a network of these buoys throughout the Arctic, in both ice-covered and open waters. The work plan includes several deployments in multiyear ice, including the Beaufort gyre and the Geomission ice base in early spring. Data at this site will be augmented by additional measurements made whilst at the camp, along with complementary studies by other Geomission projects. Results will be disseminated through collaboration with Science Alliance Live, at Polar Science Weekend, and in curricula at the University of Washington. Buoy data will also be visualized in near real time on the project website. All data will be submitted within 1 year to CADIS.