The stable isotopic composition (δ¹³C and δ¹⁵N) and carbon/nitrogen ratio (C/N) of particulate organic matter (POM) in the Chukchi and East Siberian shelves from July to September, 2016 were measured to evaluate the spatial variability and origin of POM. The δ¹³C_POC values were in the range of −29.5‰to −17.5‰ with an average of −25.9‰±2.09‰, and the δ¹⁵N_PN values ranged from 3.9‰ to 13.1‰ with an average of 8.0‰±1.6‰. The C/N ratios in the East Siberian shelf were generally higher than those in the Chukchi shelf, while the δ¹³C and δ¹⁵N values were just the opposite. Abnormally low C/N ratios (<4), low δ¹³C_POC (almost −28%) and high δ¹⁵N_PN (>10‰) values were observed in the Wrangel Island polynya, which was attributed to the early bloom of small phytoplankton. The contributions of terrestrial POM, bloom-produced POM and non-bloom marine POM were estimated using a three end-member mixing model. The spatial distribution of terrestrial POM showed a high fraction in the East Siberian shelf and decreased eastward, indicating the influence of Russian rivers. The distribution of non-bloom marine POM showed a high fraction in the Chukchi shelf with the highest fraction occurring in the Bering Strait and decreased westward, suggesting the stimulation of biological production by the Pacific inflow in the Chukchi shelf. The fractions of bloom-produced POM were highest in the winter polynya and gradually decreased toward the periphery. A negative relationship between the bloom-produced POM and the sea ice meltwater inventory was observed, indicating that the net sea ice loss promotes early bloom in the polynya. Given the high fraction of bloom-produced POM, the early bloom of phytoplankton in the polynyas may play an important role on marine production and POM export in the Arctic shelves.

稳定的同位素组成（δ ¹³ C和δ ¹⁵ N）和碳/氮比的在从七月楚科奇和西伯利亚货架九月颗粒有机物（POM）（C / N），2016进行测定，以评估空间变异和POM的起源。的δ ¹³ C ^ _POC值均在-29.5‰至-17.5‰范围内，平均为-25.9‰±2.09‰，δ ¹⁵ Ñ _PN值从3.9‰至13.1‰，平均为8.0‰范围± 1.6‰。在东方西伯利亚搁板的C / N比一般高于在楚科奇货架较高，而δ ¹³ C和δ ¹⁵的N值是正好相反。异常低的C / N比（<4），低δ ¹³Ç _POC（几乎-28％）和高δ ¹⁵ Ñ _PN在兰吉岛浮游生物中观察到（> 10‰）值，这归因于小型浮游植物的早花期。使用三个末端成员混合模型估算了陆地POM，开花产生的POM和非开花海洋POM的贡献。地面POM的空间分布在西伯利亚东部陆架中占较高比例，向东逐渐减小，这说明了俄罗斯河流的影响。非花朵海洋POM的分布显示，楚科奇陆架的比例较高，而白令海峡的比例最高，向西递减，这表明楚科奇陆架的太平洋流入刺激了生物生产。盛开的POM的比例在冬季的多年生植物中最高，并逐渐向外围下降。观察到水华产生的POM与海冰融水存量之间存在负相关关系，这表明净海冰流失促进了多年生多枝早花。鉴于开花产生的POM的比例很高，因此在浮游生物中浮游植物的早期开花可能对北极大陆架的海洋生产和POM出口起重要作用。