| Autor: |
Hashihama F; Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan. f-hashi@kaiyodai.ac.jp.; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia. f-hashi@kaiyodai.ac.jp., Yasuda I; Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan., Kumabe A; Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan., Sato M; Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.; Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki, Japan., Sasaoka H; Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan., Iida Y; Atmosphere and Ocean Department, Japan Meteorological Agency, Tokyo, Japan., Shiozaki T; Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan., Saito H; Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan., Kanda J; Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan., Furuya K; Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.; Graduate School of Science and Engineering, Soka University, Tokyo, Japan., Boyd PW; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia., Ishii M; Meteorological Research Institute, Japan Meteorological Agency, Ibaraki, Japan. |
| Abstrakt: |
Seasonal drawdown of dissolved inorganic carbon (DIC) in the subtropical upper ocean makes a significant contribution to net community production (NCP) globally. Although NCP requires macronutrient supply, surface macronutrients are chronically depleted, and their supply has been unable to balance the NCP demand. Here, we report nanomolar increases in surface nitrate plus nitrite (N+N, ~20 nM) and phosphate (PO 4 , ~15 nM) from summer to winter in the western subtropical North Pacific. Molar ratios of upward fluxes of DIC:N+N:PO 4 to the euphotic zone (< 100 m) were in near-stoichiometric balance with microbial C:N:P ratios (107~243:16~35:1). Comparison of these upward influxes with other atmospheric and marine sources demonstrated that total supply is largely driven by the other sources for C and N (93~96%), but not for P (10%), suggesting that nanomolar upward supply of P and its preferential recycling play a vital role in sustaining the NCP. |
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