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首页 > 中国极地考察知识库 > 成果信息库 > 已审查 夏季北冰洋浮冰-水道热力学特征现场观测研究

夏季北冰洋浮冰-水道热力学特征现场观测研究

【标题】夏季北冰洋浮冰-水道热力学特征现场观测研究

【Title】Observations on the thermodynamic balance between floe and lead in the Arctic Ocean during Summer

【作者】 雷瑞波; 杨清华; 程斌; 李志军

【Author】

【期刊】极地研究

【Journal】

【期刊年份】2010

【卷】Vol. 22

【期】

【关键词】 北冰洋

【Keywords】 Arctic Ocean

【摘要】中国第3次北极科学考察期间首次开展了浮冰-水道热力平衡的现场观测。观测结果表明,观测期间气温低于0°C,调查区域正从消融期向生长期过渡,至8月23日水道逐渐封冻。之后表面薄冰的反照率为0.46(±0.03),水道内水温垂向梯度逐渐减小,水道内和冰底的水温逐渐下降。至8月底,浮冰底部的生消达到平衡;侧部仍处于融冰期,对应的平均融解潜热通量为19(±6) W/m2;对观测区的海冰而言,至8月下旬,相对于底部和表面的生消,侧部融化对其物质平衡贡献较大。

【Abstract】Thermodynamic balance between a floe and a small lead in the Arctic Ocean has been observed during the ice-camp period in the third Chinese Arctic Research Expedition from 20 to 28 August, 2008. The field measurements include surface air temperature above the floe, albedo of the lead, seawater temperatures in the lead and under the floe, the lateral and bottom mass balance of the floe. The surface air temperature kept being sub-zero Celsius degree during the observation. Sea ice has begun its annual cycle of growth in response to autumn cooling. The surface of the lead was frozen-up by 23 August. From then onward, the albedo of the thin ice-covered lead was 0.46(±0.03), the vertical seawater-temperature gradient in the lead, as well as the seawater temperatures both in the lead and under the floe decreased gradually, while the oceanic heat under the ice approached to zero. By the end of the observation, the thickness of the investigated floe has reached its annual minimum, while the lateral of the floe was in the melt phase, with mean melt rate of 1.0(±0.3)cm/d during the measurement, responding to an equivalent latent heat flux of 19(±6) W/m2. The lateral melt of the floe showed the most significant contribution to the sea-ice mass balance when comparing with the surface and bottom mass balances of the floe for our investigated region by the end of August.

【基金/项目】 国家自然科学基金重点项目“北极海冰快速变化及其天气气候效应研究” ; 挪威科学委员会资助项目

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