Dry deposition fluxes of inorganic nitrogen and phosphorus in atmospheric aerosols over the Marginal Seas and Northwest Pacific
Dry deposition fluxes of inorganic nitrogen and phosphorus in atmospheric aerosols over the Marginal Seas and Northwest Pacific
复制标题
边缘海和西北太平洋大气气溶胶中无机氮和磷的干沉降通量
DOI：
10.1016/j.atmosres.2020.105076
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发表时间：
2020-11
影响因子：
5.5
通讯作者：
Gao Huiwang
中科院分区：
文献类型：
--
作者：
Jianhua Qi;Yu Yang;Yao Xiaohong;Yuan Gang;Gao Huiwang
为了改进对海洋N、P干沉降通量(FD)的估算，于2005年至2017年测量了气溶胶颗粒中NO_2-−、NO_3-−、NH_4~+和PO_4~(3+)−的浓度，并模拟了中国和西北太平洋边缘海区的干沉降速率(VD)。结合模拟速率和测量的粒度分布，计算出研究海域NO_2−、NO_3-−、NH_4+、PO_4_3−的Vd值分别为0.92±0.06、0.95±0.08、0.68±0.03和0.65±0.06 cm·S−1。这些物种的Vd的空间变化取决于风速和质量浓度的大小分布。根据多年的观测结果，该地区大气中NO_2-−、NO_3-−、NH_4+和PO43-−的平均浓度分别为2.07nmol·m-−-3、58.5nmol·m-−-3、107.9-56.7nmol·m-−-3和1.13%±1.10nmol·m-−-3。虽然NO2−、NH4+和PO43−的Fd值分别为42.74、57.40和0.66±0.72μ·m2.d−1，但大多数海洋地区的估算值均低于1mol.m2.d-1。除南中国海外，边缘海区NO_3、−和NH_4~+的FD值是净水位势的3-6倍，而PO43-−通量仅在黄渤海高。溶解N/P值变化范围为84~338，表明N相当于大气输入中国边缘海和西北太平洋期间P的相对丰度。结果表明，大气人为营养物质的长期输入会对边海和公海的营养盐化学计量比和初级生产力产生不同的影响。
To improve estimation of the dry deposition flux (Fd) of nitrogen and phosphorus over the ocean, the concentrations of NO2−, NO3−, NH4+, and PO43−in aerosol particles were measured from 2005 to 2017, and their deposition rates (Vd) were modeled over the marginal seas of China and the northwest Pacific (NWP). Combined with the modeled rates and the measured size distribution, the Vdvalues of NO2−, NO3−, NH4+, and PO43−over the studied ocean region were calculated to at 0.92 ± 0.06, 0.95 ± 0.08, 0.68 ± 0.03 and 0.65 ± 0.06 cm·s−1on average, respectively. The spatial variation in Vdfor these species was dependent on the wind speed and mass concentration size distribution. Based on the multiyear observations over the region, the average concentrations of atmospheric NO2−, NO3−, NH4+, and PO43−were 2.07 ± 1.58 nmol·m−3, 58.5 ± 44.3 nmol·m−3, 107.9 ± 56.7 nmol·m−3and 1.13 ± 1.10 nmol·m−3, respectively. The estimated Fdof NO2−was lower than 1 μmol·m2·d−1in most ocean regions, although the Fdof NO3−, NH4+and PO43−were 42.74 ± 25.02, 57.40 ± 29.50 and 0.66 ± 0.72 μmol·m2·d−1, respectively. Except for the South China Sea, the Fdvalues of NO3−and NH4+were 3–6 times higher over the marginal seas than the NWP while the PO43−flux was only high over the Yellow and Bohai Seas. The dissolved N/P ratio influx varied from 84 to 338, indicating that N was equivalent to the relative abundance of P during the atmospheric input to the China marginal seas and the NWP. Our results showed that the long-term input of atmospheric anthropogenic nutrients would cause different influences on the stoichiometric ratios of nutrients and primary productivity between marginal seas and open ocean.
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影响因子：
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作者：
Yan Zhang;Qi Yu;Weichun Ma;Limin Chen
通讯作者：
Yan Zhang;Qi Yu;Weichun Ma;Limin Chen
影响因子：
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影响因子：
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作者：
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作者：
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通讯作者：
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通讯作者：
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