SGER: Modeling Heat Exchange between Arctic Leads and Underlying Water Utilizing Be7 Measurements

9809168 Kadko是北冰洋夏季表层能量平衡中的一个重要未知数，涉及融化季节期间非均匀冰-海系统的能量输入(主要是短波辐射)的去向。向下流动的太阳辐射是通过铅直接加热海洋的主要来源，但通过铅吸收的太阳能的命运尚不完全清楚。要理解冰反照率的反馈，必须知道能量是如何在浮冰边缘的横向融化、冰的底部融化或水柱变暖之间分配的。在这项工作中，铅和底层混合层之间的热交换将产生宇宙射线产生的物质，这些物质被输送到地球表面，因此可以作为传入太阳辐射的代理。因为它有一个已知的衰减率，它可以用来估计铅水在太阳照射下的平均暴露时间，以及太阳能到冰底的传送率。同位素的平均寿命为77天，因此是评估季节性过程的理想示踪剂。这次分析的样品是作为最初的SHEBA(北冰洋地表热量预算)现场计划的一部分收集的，并成功地进行了BE-7的测量。这是有史以来第一次在北极冰层下对这种同位素进行测量。

9809168 Kadko One of the important unknowns in the summer surface energy balance of the Arctic Ocean involves the fate of the energy inputs (mostly shortwave radiation) in the heterogeneous ice-ocean system during the melt season. Downwelling solar radiation is the primary source for the direct heating of the ocean through leads, but the fate of the solar energy absorbed through the leads is not adequately known. To understand the ice-albedo feedback, one must know how the energy is partitioned between lateral melting of floe edges, bottom melting of ice, or warming of the water column. In this work, the heat exchange between the leads and underlying mixed layer will cosmic ray produced species which is delivered to the earth's surface, and as such can be used as a proxy for incoming solar radiation. Because it has a known decay rate, it can be used to estimate the mean exposure time of lead water to solar insolation, and the delivery rate of solar energy to the ice bottom. The mean life of the isotope is 77 days, and thus it is an ideal tracer for evaluating seasonal processes. Samples for this analysis were collected as part of the initial SHEBA (Surface Heat Budge of the Arctic Ocean) field program, and measurement of Be-7 were successfully made. These are the first measurements of this isotope ever made under the Arctic ice.