NDLI: Nearshore Carbonate Dissolution in the Hawaiian Archipelago?

Content Provider	Springer Nature Link
Author	Thompson, Robert W. Dickson, Andrew G. Kahng, Samuel E. Winn, Christopher D.
Copyright Year	2014
Abstract	Inorganic carbon measurements made in the late 1980s suggest that alkalinity in the waters surrounding the Hawaiian Archipelago is elevated relative to the oligotrophic waters of the North Pacific. These observations have been interpreted as evidence for a “halo” of elevated carbonate saturation state produced by the dissolution of highly soluble magnesium calcites and aragonite on the island platform or in the water column surrounding the islands. If present, this “halo” has implications for air–sea carbon dioxide exchange in Hawaiian waters and may impact the response of coral reef communities to the acidification of the surface waters of the global ocean. The purpose of this study was to assess the magnitude and extent of the elevated calcium carbonate saturation state observed on previous expeditions to this region. Transects were conducted near several atolls in the Northwestern Hawaiian Islands from shallow water adjacent to the forereef to the open ocean 15 km from the island. Hydrographic profiles were collected at each station, and discrete water samples were collected for the measurement of carbon system parameters necessary to compute calcium carbonate saturation state. Our data were compared with observations made at the Hawaii Ocean Time-series site at Station ALOHA and with hydrographic data collected on the WOCE lines in the North Pacific around the archipelago. We did not detect a carbonate dissolution halo around the islands. We conclude that the previously observed halo was probably an analytical artifact, or possibly a result of extreme variability in carbon chemistry surrounding the islands.
Starting Page	467
Ending Page	481
Page Count	15
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	20
Issue Number	5
e-ISSN	15731421
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-03-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Northwestern Hawaiian Islands Alkalinity Carbonate dissolution Carbon dioxide Buffering Ocean acidification Mg-calcite Geochemistry Hydrology/Water Resources Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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