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

SGER：利用 Be7 测量对北极铅和底层水之间的热交换进行建模

• 批准号: 9809168
• 负责人: Mark Stephens
• 金额: $ 6.4万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9809168&HistoricalAwards=false
• 关键词: SGER; Modeling; Heat; Exchange; between

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.

9809168 Kadko 北冰洋夏季表面能量平衡的重要未知数之一涉及融化季节期间异质冰海系统中能量输入（主要是短波辐射）的命运。 下降的太阳辐射是通过导线直接加热海洋的主要来源，但通过导线吸收的太阳能的命运尚不清楚。为了理解冰反照率反馈，我们必须知道能量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。 在这项工作中，引线和下面的混合层之间的热交换将产生宇宙射线物质，这些物质被传送到地球表面，因此可以用作入射太阳辐射的代表。因为它具有已知的衰减率，所以可以用来估计铅水暴露在太阳照射下的平均时间，以及太阳能到冰底的输送率。同位素的平均寿命为 77 天，因此它是评估季节性过程的理想示踪剂。 作为最初的 SHEBA（北冰洋表面热变化）现场计划的一部分，收集了用于此分析的样本，并成功进行了 Be-7 的测量。这是在北极冰层下首次测量这种同位素。