Spatial and Temporal Variation of Surface xCO2 Providing Net Biological Productivities in the Western North Pacific in June
Spatial and Temporal Variation of Surface xCO2 Providing Net Biological Productivities in the Western North Pacific in June
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6 月份北太平洋西部提供净生物生产力的表面 xCO2 时空变化
DOI：
10.1007/s10872-005-0052-0
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发表时间：
2005
影响因子：
2.3
通讯作者：
S. Tsunogai
中科院分区：
文献类型：
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作者：
K. Sugiura;S. Tsunogai
2000年6月，在北太平洋西部沿东经155°（34°）至北纬44°（44°）之间进行的两次巡航中，相隔3周，对地表水xco2进行了14000多次测量。根据盐度和海温（SST）分布，将该区划分为6个分区；由北至南依次为潮、潮锋、过渡区、黑潮锋、黑潮延伸ⅰ、ⅱ区。相对于大气中的二氧化碳，地表水总是不饱和的。涩尾海水的欠饱和程度最低：其xco2略微下降了7 ppm，而海温上升了2°C。经恒温归一化后的xco2显著降低。在两个锋区，18-19天后观测到30-40 ppm的大幅下降。在黑潮延伸带，xco2升高，但标准化xco2明显降低。过渡带水可能受到地下水混合的一定影响，表现为海温上升最小，po4浓度未下降，表层温度较低，稳定性较差。由于海气co2通量的不确定性不大，xco2数据使我们能够计算净生物生产力。过渡带外约60 mmol C m - 2d - 1的生产力表明，北太平洋西北部，特别是两个锋面区，可以被认为是世界上最具生产力的海洋之一。
More than 14,000 measurements of surface water xCO2were obtained during two cruises, 3 weeks apart in June 2000, along 155°E between 34 and 44°N in the western North Pacific Ocean. Based on the distributions of salinity and sea surface temperature (SST), the region has been divided into 6 subregions; Oyashio, Oyashio front, Transition, Kuroshio front, and Kuroshio extension I and II zones, from north to south. The surface waters were always undersaturated with respect to atmospheric CO2. The Oyashio water was the least undersaturated: its xCO2decreased slightly by 7 ppm, while SST increased by 2°C. The xCO2normalized to a constant temperature decreased considerably. In the two frontal zones, a large drawdown of 30–40 ppm was observed after 18–19 days. In the Kuroshio extension zones, the xCO2increased, but the normalized xCO2decreased considerably. The Transition zone water may be somewhat affected by mixing with the subsurface water, as indicated by the smallest SST rise, an undecreased PO4concentration, and a colder and less stable surface layer than the Oyashio front water. As the uncertainty derived from the air-sea CO2flux was not large, the xCO2data allowed us to calculate the net biological productivity. The productivities around 60 mmol C m−2d−1outside the Transition zone indicate that the northwestern North Pacific, especially the two frontal zones, can be regarded as one of the most productive oceans in the world.
Tsunogai，Shizuo：“海洋中碳酸盐和有机碳的颗粒通量：海洋生物活动是否充当大气碳汇？”
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