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Nutrient and dissolved inorganic carbon variability in the North Pacific
Journal of Oceanography ( IF 1.3 ) Pub Date : 2020-09-05 , DOI: 10.1007/s10872-020-00561-7
Sayaka Yasunaka , Humio Mitsudera , Frank Whitney , Shin-ichiro Nakaoka

A compilation of surface water nutrient (phosphate, nitrate, and silicate) and partial pressure of CO2 (pCO2) observations from 1961 to 2016 reveals seasonal and interannual variability in the North Pacific. Nutrients and calculated dissolved inorganic carbon (DIC) reach maximum concentrations in March and minimum in August. Nutrient and DIC variability is in-phase (anti-phase) with changes in the mixed layer depth (sea surface temperature) north of 30 °N, and it is anti-phase (in-phase) with changes in Chl-a north of 40 °N (in 30 °N–40 °N). Seasonal drawdown of nutrients and DIC is larger toward the northwest and shows a local maximum in the boundary region between the subarctic and subtropics. Stoichiometric ratios of seasonal drawdown show that, compared to nitrate, silicate drawdown is large in the northwestern subarctic including the Bering and Okhotsk seas, and drawdown of carbon is larger toward the south. Net community production in mixed layer from March to July is estimated to be more than 6 gC/m2/mo in the boundary region between the subarctic and subtropics, the western subarctic, the Gulf of Alaska, and the Bering Sea. Nutrient and DIC concentrations vary with the Pacific Decadal Oscillation and the North Pacific Gyre Oscillation which cause changes in horizontal advection and vertical mixing. The DIC trend is positive in all analysis area and large in the western subtropics (> 1.0 μmol/l/yr). Averaged over the analysis area, it is increasing by 0.77 ± 0.03 μmol/l/yr (0.75 ± 0.02 μmol/kg/yr).

中文翻译:

北太平洋养分和溶解无机碳的变化

1961 年至 2016 年地表水养分(磷酸盐、硝酸盐和硅酸盐)和 CO2 分压 (pCO2) 观测的汇编揭示了北太平洋的季节和年际变化。营养素和计算出的溶解无机碳 (DIC) 在 3 月份达到最高浓度,在 8 月份达到最低浓度。养分和 DIC 的变异性与 30 °N 以北的混合层深度(海面温度)的变化同相(反相),而与北纬 30 °N 以北的 Chl-a 变化为反相(同相) 40 °N(在 30 °N–40 °N)。营养盐和 DIC 的季节性下降向西北较大,在亚北极和亚热带之间的边界区域显示出局部最大值。季节性下降的化学计量比表明,与硝酸盐相比,包括白令海和鄂霍次克海在内的西北亚北极地区的硅酸盐下降幅度较大,而碳的下降幅度向南较大。在亚北极和亚热带、西亚北极、阿拉斯加湾和白令海之间的边界区域,3 月至 7 月混合层的净群落产量估计超过 6 gC/m2/mo。营养物质和 DIC 浓度随太平洋年代际振荡和北太平洋环流振荡而变化,这会导致水平平流和垂直混合的变化。DIC 趋势在所有分析区域都是正的,在西亚热带地区很大(> 1.0 μmol/l/yr)。平均在分析区域,它增加了 0.77 ± 0.03 μmol/l/yr (0.75 ± 0.02 μmol/kg/yr)。在亚北极和亚热带、西亚北极、阿拉斯加湾和白令海之间的边界区域,3 月至 7 月混合层的净群落产量估计超过 6 gC/m2/mo。营养物质和 DIC 浓度随太平洋年代际振荡和北太平洋环流振荡而变化,这会导致水平平流和垂直混合的变化。DIC 趋势在所有分析区域都是正的,在西亚热带地区很大(> 1.0 μmol/l/yr)。平均在分析区域,它增加了 0.77 ± 0.03 μmol/l/yr (0.75 ± 0.02 μmol/kg/yr)。在亚北极和亚热带、西亚北极、阿拉斯加湾和白令海之间的边界区域,3 月至 7 月混合层的净群落产量估计超过 6 gC/m2/mo。营养物质和 DIC 浓度随太平洋年代际振荡和北太平洋环流振荡而变化,这会导致水平平流和垂直混合的变化。DIC 趋势在所有分析区域都是正的,在西亚热带地区很大(> 1.0 μmol/l/yr)。平均在分析区域,它增加了 0.77 ± 0.03 μmol/l/yr (0.75 ± 0.02 μmol/kg/yr)。营养物质和 DIC 浓度随太平洋年代际振荡和北太平洋环流振荡而变化,这会导致水平平流和垂直混合的变化。DIC 趋势在所有分析区域都是正的,在西亚热带地区很大(> 1.0 μmol/l/yr)。平均在分析区域,它增加了 0.77 ± 0.03 μmol/l/yr (0.75 ± 0.02 μmol/kg/yr)。营养物质和 DIC 浓度随太平洋年代际振荡和北太平洋环流振荡而变化,这会导致水平平流和垂直混合的变化。DIC 趋势在所有分析区域都是正的,在西亚热带地区很大(> 1.0 μmol/l/yr)。平均在分析区域,它增加了 0.77 ± 0.03 μmol/l/yr (0.75 ± 0.02 μmol/kg/yr)。
更新日期:2020-09-05
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