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首页> 外文期刊>Journal of oceanography >Nutrient variability in the mixed layer of the subarctic Pacific Ocean, 1987–2010
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Nutrient variability in the mixed layer of the subarctic Pacific Ocean, 1987–2010

机译：1987-2010年北极亚太平洋混合层的营养素变化

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Data collected primarily from commercial ships between 1987 and 2010 are used to provide details of seasonal, interannual and bidecadal variability in nutrient supply and removal in the surface ocean mixed layer across the subarctic Pacific. Linear trend analyses are used to look for impacts of climate change in oceanic domains (geographic regions) representing the entire subarctic ocean. Trends are mixed and weak (generally not significant) in both winter and summer despite evidence that the upper ocean is becoming more stratified. Overall, these data suggest little change in the winter resupply of the mixed layer with nutrients over the past 23?years. The few significant trends indicate a winter increase in nitrate (~0.16?μM?year?1) in the Bering Sea and in waters off the British Columbia coast, and a decline in summer phosphate (0.018?μM?year?1) in the Bering. An oscillation in Bering winter nutrient maxima matches the lunar nodal cycle (18.6?years) suggesting variability in tidal mixing intensity in the Aleutian Islands affects nutrient transport. Nitrate removal from the seasonal mixed layer varies between 6?μM along the subarctic–subtropical boundary and 18?μM off the north coast of Japan, with April to September new production rates in the subarctic Pacific being estimated at 2 and 6?moles?C?m?2. Changes in nutrient removal in the Bering and western subarctic Pacific (WSP) suggest either the summer mixed layer is thinning with little change in new production or new production is increasing which would require an increase in iron transport to these high-nutrient low-chlorophyll (HNLC) waters. Si/N and N/P removal ratios of 2.1 and 19.7 are sufficient to push waters into Si then N limitation with sufficient iron supply. Because ~3?μM winter nitrate is transferred to reduced N pools in summer, new production calculated from seasonal nutrient drawdown should not be directly equated to export production.
机译：主要从1987年至2010年之间的商业船上收集的数据用于提供整个北极亚太平洋表层海洋混合层中养分供应和去除的季节性，年际和双年代际变化的详细信息。线性趋势分析用于寻找气候变化对代表整个北极地区的海洋域（地理区域）的影响。尽管有证据表明上层海洋变得越来越分层，但冬季和夏季的趋势却参差不齐，而且微弱（通常不重要）。总体而言，这些数据表明在过去23年中，混合养分的冬季再补充几乎没有变化。几个显着趋势表明白令海和不列颠哥伦比亚省沿海水域冬季硝酸盐增加（〜0.16？M？年？1），而夏季磷酸盐减少（0.018？M？年？1）。白令。白令冬季养分最大值的振荡与月球节周期（18.6年）相匹配，表明阿留申群岛的潮汐混合强度变化会影响养分的运输。从季节性混合层中去除的硝酸盐沿亚热带到亚热带边界的变化范围为6？μM，而到日本北海岸以外的范围为18？M，在4月至9月期间，北极的太平洋新生产力估计为2和6？mol？C。 2。白令河和西北极亚太平洋（WSP）养分去除的变化表明，夏季混合层变薄，新产量变化不大，或者新产量增加，这将需要增加铁向这些高营养低叶绿素的转运（ HNLC）水域。 2.1 / 19.7的Si / N和N / P去除率足以将水推入Si，然后通过充足的铁供应来限制N。由于夏季约有3μm的冬季硝酸盐转移到了减少的氮库中，因此从季节性养分吸收得出的新产量不应直接等同于出口产量。

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