Control of acid polysaccharide production and 234Th and POC export fluxes by marine organisms -: art. no. 1044

被引:84
作者
Santschi, PH
Hung, CC
Schultz, G
Alfarado-Quiroz, N
Guo, LD
Pinckney, J
Walsh, I
机构
[1] Texas A&M Univ, Dept Oceanog, Lab Oceanog & Environm Res, Galveston, TX 77551 USA
[2] Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA
[3] Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA
[4] Oregon State Univ, Coll Ocean & Atmospher Sci, Corvallis, OR 97331 USA
关键词
D O I
10.1029/2002GL016046
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] Ratios of particulate organic carbon (POC) to particulate Th-234 activities (POC/Th-234) in the ocean are used to determine the POC export flux, and thus, the power of the biological pump. In order to understand the main reasons why this ratio frequently varies as a function of depth, size, and kind ( suspended vs. sinking particles), we measured vertical profiles in a cold core ring and warm core ring in the Gulf of Mexico in May 2001. Here we show that particulate Th-234/POC ratios in the Gulf of Mexico are positively correlated to the content of different Th(IV)-binding polysaccharide fractions ( uronic acids, total acid poly accharides, total polysaccharides) in both suspended and sinking particles as well as to prymnesiophyte abundance, but negatively correlated to bacterial production. Variations in acid polysaccharide compounds, produced by both algae and bacteria, but degraded only by bacteria, can account for observed variations in POC/Th-234 ratios seen in the ocean.
引用
收藏
页码:16 / 1
页数:4
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