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首页> 外文期刊>Tellus, Series B. Chemical and Physical Meteorology >Interannual variations of net community production and air-sea CO_2 flux from winter to spring in the western subarctic North Pacific
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Interannual variations of net community production and air-sea CO_2 flux from winter to spring in the western subarctic North Pacific

机译：北北极西部太平洋从冬季到春季的净群落生产和气海CO_2通量的年际变化

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摘要

The role of spring biological production for the air-sea CO_2 flux was quantified in the Western Subarctic Gyre (48°, 165°E), where the vertical profile of temperature revealed the existence of a temperature minimum (T_(min)) layer in the North Pacific. The vertical profiles of temperature, salinity, dissolved oxygen, nutrients and dissolved inorganic carbon, DIC, in the upper water column were significantly variable year by year in spring, 1996-2000. Correspondingly, surface seawater at this site in spring was supersaturated with CO_2 in 1997, 1999 and 2000, but was undersaturated in 1996 and 1998. The concentrations of DIC and nutrients in the winter mixed layer were estimated from those in the T_(min) layer in spring with a correction for particle decomposition based on the apparent oxygen utilization. The net community production (NCP) and air-sea CO_2 flux from winter to spring were calculated from the vertically integrated deficits of DIC and nutrients in the upper water column between the two seasons. The calculation of the carbon budget indicated large interannual variations of NCP (0-13 mmol m~(-2) d~(-1)) and CO_2 efflux (4-16 mmol m~(-2) d~(-1)) for this period. The CO_2 efflux was generally low in the year when NCP was high. The close coupling between biological production and CO_2 efflux suggested the important role of the changes in the mixed-layer depth, as a key process controlling both processes, especially of the timing, so that a decrease in the mixed-layer depth could result in the activation of biological production. The early biological consumption of the surface DIC concentration could shorten the period for acting as a source for atmospheric CO_2 and depress the CO_2 efflux in the Western Subarctic Gyre from winter to spring in 1996 and 1998. On the contrary, in 1997, persistently deep vertical mixing until late spring could suppress the biological activity and give rise to long-lasting CO_2 efflux.
机译：春季生物生产对气-海CO_2通量的作用在西北极圈（48°，165°E）进行了定量，其中温度的垂直剖面表明在该温度下存在最低温度（T_（min））层。北太平洋。 1996-2000年春季，上部水柱中温度，盐度，溶解氧，养分和溶解无机碳DIC的垂直剖面逐年变化很大。相应地，春季，1997年，1999年和2000年该站点的地表海水中的CO_2过饱和，但1996年和1998年时，其地下水饱和度较低。在春季，根据表观氧气利用率对颗粒分解进行校正。根据两个季节之间上层水柱中DIC和养分的垂直积分赤字，计算了冬季到春季的净群落产量（NCP）和海气CO_2通量。碳收支的计算表明NCP（0-13 mmol m〜（-2）d〜（-1））和CO_2流出量（4-16 mmol m〜（-2）d〜（-1）的年际变化较大。 ）。在NCP高的年份，CO_2的流出量通常较低。生物产量与CO_2外排之间的紧密耦合表明，混合层深度的变化具有重要作用，这是控制这两个过程的关键过程，尤其是时间，因此，混合层深度的减少可能导致混合层深度的减小。激活生物生产。早期生物消耗表面DIC浓度可以缩短1996年和1998年冬季至春季从春季到春季的西亚北极圈内大气中CO_2的排放源的时间，并抑制CO_2的流出。相反，在1997年，垂直深部持续存在混合直至春末可以抑制生物活性并引起持久的CO_2流出。

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