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ENSO related variations in biogeochemistry of AA and HA in settling particles along the equatorial Pacific Ocean

机译：ENSO相关的AA和HA在赤道太平洋沿岸沉降粒子的生物地球化学变化

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Four year-long time-series sediment trap experiments were conducted along the equatorial Pacific Ocean in order to understand the biogeochemistry of particulate organic matter (POM) on the basis of amino acid (AA) and hexosamine (HA) compositions of the settling particles. Total mass flux in the study area varied over 4 orders of magnitude without a common seasonality among all trap sites. Planktonic blooms were apparent in terms of total mass and AA fluxes at the easternmost end of the Ni?o-4 region. AA fluxes closely followed the total mass flux profiles, suggesting that increased particle flux delivered a greater amount of labile OM to the deep ocean. A labile OM index (LI)-based classification showed that during the El Ni?o conditions in 2002, the eastern side of the equatorial Pacific transported relatively more labile OM than the western equatorial Pacific. An overall change in AA and HA composition of settling particles could be revealed with the help of discriminant analysis, suggesting that settling particles during El Ni?o were compositionally different from those settling during La Ni?a condition in the equatorial Pacific.
机译：为了了解沉降颗粒的氨基酸（AA）和六胺（HA）成分，沿赤道太平洋进行了为期四年的时间序列沉积物捕获实验，目的是了解颗粒有机物（POM）的生物地球化学。研究区域中的总质量通量变化超过4个数量级，而在所有捕集点之间没有相同的季节性。在Ni？o-4地区最东端，浮游生物的开花在总质量和AA通量方面很明显。 AA通量紧随总质量通量分布图，表明增加的颗粒通量向深海输送了更多的不稳定OM。基于不稳定的OM指数（LI）的分类显示，在2002年的厄尔尼诺现象期间，赤道太平洋的东侧比西部的赤道太平洋运输了相对不稳定的OM。可以通过判别分析揭示沉降颗粒的AA和HA成分的总体变化，这表明在厄尔尼诺现象期间的沉降颗粒与赤道太平洋拉尼娜条件下的沉降颗粒组成不同。

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