Multi‐decadal decrease of net community production in western subarctic North Pacific
Multi‐decadal decrease of net community production in western subarctic North Pacific
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北太平洋亚北极西部地区净群落生产的数十年下降
DOI：
10.1029/2001gl014332
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发表时间：
2002
影响因子：
5.2
通讯作者：
T. Saino
中科院分区：
文献类型：
--
作者：
T. Ono;K. Tadokoro;T. Midorikawa;J. Nishioka;T. Saino
利用准月分辨率研究了1968 ~ 1998年副北极西太平洋混合层磷酸盐浓度的时间变化。2月和7月磷酸盐时间序列分别呈线性下降趋势，分别为-0.008 ± 0.003和-0.019 ± 0.005 μmol/l/y，而4月/5月磷酸盐时间序列未观察到多年代际趋势。根据这一结果，2月至4月的生物磷净消耗量以-0.43 ± 0.11 mmolP/m2/y的速率线性下降，而5月至7月的生物磷净消耗量以+0.16 ± 0.05 mmolP/m2/y的速率增加。从2月到8月，净生物磷消耗量以−0.40 ± 0.07 mmolP/m2/y的速率线性减少，相当于在C/P比为106的假设下，净群落生产量减少了−0.51 ± 0.09 gC/m2/y。4月混合层叶绿素a库存也呈下降趋势，为-2.35 ± 1.22 mg/m2/y，这与2月至4月观察到的净产量下降相关。
Temporal variation of phosphate concentration in the mixed layer of western subarctic North Pacific from 1968 to 1998 was investigated with quasi‐monthly resolution. February and July phosphate time series showed a linear decreasing trend of −0.008 ± 0.003 and −0.019 ± 0.005 μmol/l/y, respectively, while no multi‐decadal trend was observed in April/May phosphate time series. With this result, net biological phosphate consumption between February and April linearly decreased at the rate of −0.43 ± 0.11 mmolP/m2/y, while that between May and July increased at the rate of +0.16 ± 0.05 mmolP/m2/y. Net biological phosphate consumption from February through August was linearly diminished at the rate of −0.40 ± 0.07 mmolP/m2/y, corresponding to a −0.51 ± 0.09 gC/m2/y decrease of net community production under assumption of the constant C/P ratio of 106. Chl.a inventory in the April mixed layer also showed a decreasing trend of −2.35 ± 1.22 mg/m2/y, which correlated with the observed net production decrease between February and April.