11 0

Sources of organic matter in two contrasting tropical coastal environments: The Caribbean Sea and the eastern Pacific

Title
Sources of organic matter in two contrasting tropical coastal environments: The Caribbean Sea and the eastern Pacific
Author
신경훈
Keywords
Glycerol dialkyl glycerol tetraethers (GDGTs); n-alkanes; Terrestrial input; Caribbean; Eastern tropical pacific
Issue Date
2019-12
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES, v. 96, Article no. 102349
Abstract
In this study, we evaluate sources of organic matter (OM) in two contrasting tropical coastal environments in Colombia, using a combination of glycerol dialkyl glycerol tetraethers (GDGTs) and n-alkane lipid biomarkers. A clear difference between the less productive Caribbean Sea and the more productive eastern Pacific is observed, with higher terrestrial contributions into the eastern Pacific strongly associated with riverine inputs. Although higher land plant-derived n-alkanes can be transported as eolian dust, our results suggest mainly riverine sources for our samples. When looking at the branched GDGT compositions, in situ production could be identified in most Caribbean stations and some of the more coastal sites in the Pacific with #rings(te)(tra) index values of above 0.7. The remaining stations in the eastern Pacific display soil-eroded GDGTs inputs associated with river discharges and deposited in the proximity of the coast. Marine production as measured by short chain n-alkanes and crenarchaeol are also higher in the eastern Pacific. It appears that the terrestrial inputs would bring nutrients as well as OM fueling both auto- and heterotrophs making the eastern Pacific overall more productive. We also observe OM of petrogenic origin, albeit in a low amount, especially in coastal Caribbean sites located near main harbors. This study helps improve the understanding of the complex mixture of OM inputs, origins and transport mechanisms into Colombian coastal areas. The present work emphasizes the need to integrate climate, geological setting and hydrology to fully understand the carbon cycle at a regional scale.
URI
https://www.sciencedirect.com/science/article/pii/S0895981119303402http://repository.hanyang.ac.kr/handle/20.500.11754/122267
ISSN
0895-9811
DOI
10.1016/j.jsames.2019.102349
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE