The northwestern Barents Sea (NW-BS) is a highly productive region within the transitional zones of an Atlantic to Arctic-dominated marine ecosystem. The steep latitudinal gradients in sea ice concentration, Atlantic and Arctic Water, offer an opportunity to test hypotheses on physical drivers of spatial and temporal variability of net primary production (NPP). However, quantifying NPP in such a large ocean region can be challenged by the lack of in situ measurements with high spatial and temporal resolution, and gaps in remote sensing estimates due to the presence of clouds and sea ice, and assumptions regarding the depth distribution of alga biomass. Without reliable data to evaluate models, filling these gaps with numerical models is limited by the model representation of the physical environment and its assumptions about the relationships between NPP and its main limiting factors. Hence, within the framework of the Nansen Legacy Project, we combined in situ measurements, remote sensing, and model simulations to constrain the estimates of phytoplankton NPP in the NW-BS. The region was subdivided into Atlantic, Subarctic, and Arctic subregions on the basis of different phytoplankton phenology. In 2004 there was a significant regime change in the Atlantic subregion that resulted in a step-increase in NPP in tandem with a step-decrease in sea ice concentration. Contrary to results from other Arctic seas, this study does not find any long term trends in NPP despite changes in the physical environment. Mixing was the main driver of simulated annual NPP in the Atlantic subregion, while light and nutrients drove annual NPP in the Subarctic and Arctic subregions. The multi-source estimate of annual NPP ranged 79–118 gC m⁻² yr⁻¹ in the Atlantic, 74–82 gC m⁻² yr⁻¹ in the Subarctic, and 19–47 gC m⁻² yr⁻¹ in the Arctic. The total NPP in the NW-BS region was estimated between 15 and 48 Tg C yr⁻¹, which is 15–50% of the total NPP needed to sustain three of the most harvested fish species north of 62°N (roughly  90 Tg C yr⁻¹). This research shows the importance of continuing to strive for better regional estimates of NPP.

巴伦支海西北部（NW-BS）是大西洋到北极主导海洋生态系统过渡区内的一个高产区域。海冰浓度、大西洋和北极水域的陡峭纬度梯度为检验净初级生产（NPP）时空变化的物理驱动因素的假设提供了机会。然而，在如此大的海洋区域量化 NPP 可能会面临挑战，因为缺乏高空间和时间分辨率的现场测量，以及由于云和海冰的存在导致遥感估计存在差距，以及关于海洋深度分布的假设。藻类生物量。如果没有可靠的数据来评估模型，用数值模型填补这些空白受到物理环境的模型表示及其对核电厂及其主要限制因素之间关系的假设的限制。因此，在南森遗产项目的框架内，我们结合了原位测量、遥感和模型模拟来限制 NW-BS 中浮游植物 NPP 的估计。根据浮游植物物候的不同，该区域又分为大西洋、亚北极和北极次区域。2004年，大西洋次区域发生了重大的政权更迭，导致NPP逐步增加，同时海冰浓度逐步减少。与其他北冰洋海域的结果相反，尽管自然环境发生了变化，这项研究并未发现 NPP 存在任何长期趋势。混合是大西洋次区域模拟年度 NPP 的主要驱动力，而光和营养物则驱动亚北极和北极次区域的年度 NPP。多源估计年度 NPP 范围为：大西洋为 79–118  gC  m ⁻²  yr ⁻¹ ，亚北极为74–82  gC  m ⁻²  yr ⁻¹ ，北冰洋为 19–47  gC  m ⁻²  yr ^-1北极。NW-BS 地区的总 NPP 估计在 15 至 48  Tg  C  yr ⁻¹之间，占维持 62°N 以北三种捕捞最多鱼类所需总 NPP 的 15-50%（大约 90  Tg  C  yr ^-1 )。这项研究表明了继续努力更好地对 NPP 进行区域估算的重要性。