This study is led by Dr. Chen Jianfang and Dr. Li Hongliang from the Second Institute of Oceanography, Ministry of Natural Resources. Based on the field observation though two Chinese National Arctic Research Expedition (CHINARE) cruises in 2003 and 2008, the team focused the N/P uptake ratio by phytoplankton, seasonal consumption of nutrients, and export of particulate nitrogen in the Chukchi shelf and slope. Accordingly, they highlighted the overlooked contribution of the biological pump to the Pacific Arctic nitrogen deficit.