eCite Digital Repository

Western Pacific atmospheric nutrient deposition fluxes, their impact on surface ocean productivity

Citation

Martino, M and Hamilton, D and Baker, AR and Jickells, TD and Bromley, T and Nojiri, Y and Quack, B and Boyd, PW, Western Pacific atmospheric nutrient deposition fluxes, their impact on surface ocean productivity, Global Biogeochemical Cycles, 28, (7) pp. 712-728. ISSN 0886-6236 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 American Geophysical Union. All Rights Reserved.

DOI: doi:10.1002/2013GB004794

Abstract

The atmospheric deposition of both macronutrients and micronutrients plays an important role in driving primary productivity, particularly in the low-latitude ocean. We report aerosol major ion measurements for five ship-based sampling campaigns in the western Pacific from ~25°N to 20°S and compare the results with those from Atlantic meridional transects (~50°N to 50°S) with aerosols collected and analyzed in the same laboratory, allowing full incomparability. We discuss sources of the main nutrient species (nitrogen (N), phosphorus (P), and iron (Fe)) in the aerosols and their stoichiometry. Striking north–south gradients are evident over both basins with the Northern Hemisphere more impacted by terrestrial dust sources and anthropogenic emissions and the North Atlantic apparently more impacted than the North Pacific. We estimate the atmospheric supply rates of these nutrients and the potential impact of the atmospheric deposition on the tropical western Pacific. Our results suggest that the atmospheric deposition is P deficient relative to the needs of the resident phytoplankton. These findings suggest that atmospheric supply of N, Fe, and P increases primary productivity utilizing some of the residual excess phosphorus (P*) in the surface waters to compensate for aerosol P deficiency. Regional primary productivity is further enhanced via the stimulation of nitrogen fixation fuelled by the residual atmospheric iron and P*. Our stoichiometric calculations reveal that a P* of 0.1 µmol L−1 can offset the P deficiency in atmospheric supply for many months. This study suggests that atmospheric deposition may sustain ~10% of primary production in both the western tropical Pacific.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Other Chemical Sciences
Research Field:Environmental Chemistry (incl. Atmospheric Chemistry)
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
Author:Boyd, PW (Professor Philip Boyd)
ID Code:98870
Year Published:2014
Web of Science® Times Cited:9
Deposited By:IMAS Research and Education Centre
Deposited On:2015-03-05
Last Modified:2017-11-02
Downloads:0

Repository Staff Only: item control page