Mooring Measurements of Anadyr Current Nitrate, Phosphate, and Silicate Enable Updated Bering Strait Nutrient Flux Estimates
Mooring Measurements of Anadyr Current Nitrate, Phosphate, and Silicate Enable Updated Bering Strait Nutrient Flux Estimates
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DOI：
10.1029/2022gl098908
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发表时间：
2022-07
影响因子：
5.2
通讯作者：
T. Hennon;S. Danielson;R. Woodgate;Brita Irving;D. Stockwell;C. Mordy
中科院分区：
文献类型：
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作者：
T. Hennon;S. Danielson;R. Woodgate;Brita Irving;D. Stockwell;C. Mordy
利用2017年6月至2018年6月在阿纳迪尔海峡建立的原位营养盐浓度数据和盐度-营养盐参数化，估算了1997-2019年白令海峡硝酸盐、磷酸盐和硅酸盐的月太平洋-北极通量。在大多数月份，我们的估计依赖于系泊传感器和整个水样的测量结果，而在5月至8月期间，我们的基础是船上水文地理。我们发现白令海峡硝酸盐、磷酸盐和硅酸盐的年平均通量分别为16 ± 6、1.5 ± 0.5和30 ± 11 kmol/s，年际变化为平均值的±30%。最大通量出现在4月，超过年平均值的0.50%，而最小通量出现在12月。这里估计的年平均通量比以前的估计高出50%。1998-2018年，磷酸盐和硅酸盐通量呈显著（p < 0.05）增加趋势，但硝酸盐通量没有增加。然而，目前尚不清楚这些趋势结果是由于盐度-营养参数化的差异或限制。
In situ nutrient concentration data and salinity‐nutrient parameterizations established at Anadyr Strait from June 2017 to June 2018 are used to estimate monthly Pacific‐to‐Arctic fluxes of nitrate, phosphate, and silicate through Bering Strait over 1997–2019. In most months our estimates rely on measurements made from mooring‐based sensors and whole water samples, while over May–August the basis is shipboard hydrography. We find annually averaged Bering Strait fluxes of 16 ± 6, 1.5 ± 0.5, and 30 ± 11 kmol/s for nitrate, phosphate, and silicate, respectively, with inter‐annual variability ±30% of the mean. Maximum fluxes occur in April, exceeding the annual average by ∼50%, while minimum fluxes occur in December. Annually averaged fluxes estimated here are ∼50% higher than previous estimates. Significant (p < 0.05) increasing trends in phosphate and silicate fluxes are found over 1998–2018, but not nitrate. However, it is unclear if these trend results are due to differences in draw‐down or limitations of the salinity‐nutrient parameterizations.