Multi-frequency observations of seawater carbonate chemistry on the central coast of the western Antarctic Peninsula

Polar research

James B. McClintock¹  Robert A. Angus¹  Charles D. Amsler¹  Kathryn M. Schoenrock¹  Julie B. Schram² 

[1] Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Campbell Hall 464, Birmingham AL 35294-1170, USA;Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Campbell Hall 464, Birmingham AL 35294-1170, USACorrespondence

关键词: Antarctica;    aragonite;    calcite;    pH;    seawater chemistry;    total alkalinity;   

DOI  :  10.3402/polar.v34.25582

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Assessments of benthic coastal seawater carbonate chemistry in Antarctica are sparse. The studies have generally been short in duration, during the austral spring/summer, under sea ice, or offshore in ice-free water. Herein we present multi-frequency measurements for seawater collected from the shallow coastal benthos on a weekly schedule over one year (May 2012–May 2013), daily schedule over three months (March–May 2013) and semidiurnal schedule over five weeks (March–April 2013). A notable pH increase (max pH = 8.62) occurred in the late austral spring/summer (November–December 2012), coinciding with sea-ice break-out and subsequent increase in primary productivity. We detected semidiurnal variation in seawater pH with a maximum variation of 0.13 pH units during the day and 0.11 pH units during the night. Daily variation in pH is likely related to biological activity, consistent with previous research. We calculated the variation in dissolved inorganic carbon (DIC) over each seawater measurement frequen...

【 授权许可】

CC BY-NC