Export and remineralization of POM in the Southern Ocean and the South China Sea estimated from 210Po/210Pb disequilibria
Export and remineralization of POM in the Southern Ocean and the South China Sea estimated from 210Po/210Pb disequilibria
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DOI：
10.1007/s11434-009-0043-4
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发表时间：
2009-03
影响因子：
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通讯作者：
Weifeng Yang;Yipu Huang;Min Chen;Y. Qiu;A. Peng;Lei Zhang
中科院分区：
文献类型：
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作者：
Weifeng Yang;Yipu Huang;Min Chen;Y. Qiu;A. Peng;Lei Zhang
在南大洋（Ⅳ 3站）和南海（NS 44）考察了上层水210 Po和210 Pb之间的不平衡及其作为颗粒输出和再矿化的潜在应用。表层沃茨中210 Po相对不足，而次表层沃茨中210 Pb相对过量。210 Po与颗粒有机碳（POC）之间良好的正相关性表明，210 Po的亏缺和过剩分别是由于颗粒有机质（POM）的输出和颗粒化作用的结果，颗粒化作用导致δ 13 C下降和δ 15 N下降也支持了这一观点。在210 Po/210 Pb箱模型的基础上，NS 44站和IV 3站POC向沃茨外的输出通量分别为1.2 mmol C · m−2· d− 1和2.3 mmol C · m−2· d− 1。在次表层沃茨中，NS 44站和IV 3站沿着的210 Po的再平衡通量分别为0.062 Bq · m−2· d− 1和0.566 Bq · m−2· d− 1，再循环效率分别为52±26%和119± 52%。NS 44和IV 3的210 Po源POM和输出POC的再矿化通量分别为0.6 mmol C · m−2· d− 1和2.7 mmol C · m−2· d− 1。本研究表明~（210）Po是一种强有力的示踪剂。
Disequilibria between210Po and210Pb in the upper water and their potential applications as a proxy of particle export and remineralization were examined in the Southern Ocean (station IV3) and the South China Sea (NS44).210Po was deficit in surface waters but excessive relative to210Pb in subsurface waters. Good positive correlation between210Po and particulate organic carbon (POC) indicated deficits and excess of210Po resulted from particulate organic matter (POM) export and remineralization respectively, which was also supported by the decreased δ13C and increased δ15N downwards as a result of particle remineralization. On the basis of210Po/210Pb box-model, POC export flux out of the surface waters were 1.2 mmol C · m−2· d−1and 2.3 mmol C · m−2· d−1for station NS44 and IV3, respectively. In the subsurface waters, remineralization fluxes of210Po were 0.062 Bq · m−2· d−1and 0.566 Bq · m−2· d−1for station NS44 and IV3 along with the recycle efficiency of 52±26% and 119±52%, respectively. Remineralized fluxes of POM derived from210Po and exported POC were 0.6 mmol C · m−2· d−1and 2.7 mmol C · m−2· d−1for NS44 and IV3. This study suggested that210Po was a powerful tracer of particle export and remineralization.