【摘 要】
：
Sea ice controls light availability to phytoplankton,and acts as a seasonal reservoir for iron.In the spring,ice melt releases iron in the water column which can stimulate phytoplankton growth,thus pl
【机 构】
：
北京大学城市与环境学院 100871
论文部分内容阅读
Sea ice controls light availability to phytoplankton,and acts as a seasonal reservoir for iron.In the spring,ice melt releases iron in the water column which can stimulate phytoplankton growth,thus playing an important role in the marine carbon cycle.We examined the relationship between spring blooms in chlorophyll a concentration and sea ice area in the Sea of Okhotsk during the period of 2005~2009.The spring bloom in chlorophyll a concentration occurs when approximately 88%of sea ice has melted,reaching a maximum around June.A larger sea winter ice area correlates well with a higher chlorophyll a concentration in the first bloom,albeit its delayed occurrence,but corresponds to a lower annual average concentration.Given its role in regulating the primary productivity of the surface water,the impact of the sea ice change on carbon cycle in the marginal seas must not be underestimated.
其他文献
In this study,observed temperature records of 12 stations from Antarctica island,coastline,and continental areas are analyzed by means of detrended fluctuation analysis(DFA).After Monte Carlo signific
长寿命的惰性气体同位素氪-81(81Kr,半衰期23 万年)是测量和寻找古老地下水和冰样的理想示踪同位素,适用年龄范围约40-140 万年.由于它的同位素丰度极低(10-14-10-13),无法用传统的方法(如质谱或加速器质谱)来测量.我们利用激光原子阱痕量检测技术(atom trap trace analysis)实现了“放射性氪测年”这个地球科学界四十余年以来的梦想[1,2].这项技术的核心是
极地蕴藏着丰富的自然、科学资源，其进一步开发和利用具有重要的特殊意义。在科学意义上，极地气候的变化对全球气候变化起着关键作用。本文主要介绍了一种基于Dallas 公司的新型数字温度传感器的单总线温度链监测传感器的设计与制作。利用其抗干扰能力强，适合于恶劣环境的现场温度测量，使用方便等优点，此传感器只需一根数据线和地线就可通过单总线协议完成串行传输数据，经改进的单总线接口具有滞回和干扰滤波功能，使得
In this study,we focus on δ18O and selected chemical constituents snow pits collected from eight glaciers in the Tibetan Plateau and adjacent areas and discuss the impact of air mass transport on seas
An accurate representation of Antarctic coastal sea ice in Earth System Models is important as it affects the rate of Antarctic Bottom Water formation.Here we investigate the effect of using relativel
To improve the accuracy of the traditional NASA Team(NT)sea ice concentration(SIC)algorithm,a new SIC estimation method is proposed by combining the NT algorithm and a numerical optimization technique
海冰厚度是重要的气候参数,是海冰变化的第三维特征.准确获得北极海冰厚度及其变化信息,不仅有助于开展北极乃至全球气候变化、环境变化、生态安全等研究,还对海洋资源开发、海上交通航运、极地考察等具有重要的现实意义.本文基于ICESat 及CryoSat-2 卫星测高数据,估算近十年来北极海冰厚度,并分析其时空变化特征.结果表明,研究期内北极多年平均海冰厚度为2.562 ± 0.894 m,其中多年冰多年
南大洋是全球海洋底层水的主要源地，跨等密度面的海水上涌是海洋中深层水返回海洋表面的重要途径，跨等密度面的海水通量控制着碳、热量和营养盐等物质的存储，对地球气候系统有重大影响。南大洋在纬向上不受陆地阻挡造就了全球唯一的绕极环流、也是全球流量最大的一只洋流南极绕极流，是促进太平洋、大西洋和印度洋之间的热量、水分和能量交换的“发动机”。根据南大洋等密度面露头的特点，利用广泛分布的Argo观测，计算南大洋
In this study,hydrographic data collected during the Antarctic winter from March to June,2011 by the CTD-tags installed on five elephant seals were analyzed to study the upper water evolution in polyn
The ocean,particularly the Southern Ocean,is considered a significant source of atmospheric N2O,which is an ozone-depleting greenhouse gas.However,there are limited data available supporting this conc