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Impact of Indus River discharge on productivity and preservation of organic carbon in the Arabian Sea over the twentieth century

Andreas Lueckge, Gaudenz Deplazes, Hartmut Schulz, Georg Scheeder, Axel Suckow, Sabine Kasten and Gerald H. Haug
Impact of Indus River discharge on productivity and preservation of organic carbon in the Arabian Sea over the twentieth century
Geology (Boulder) (March 2012) 40 (5): 399-402

Abstract

Marine high-productivity zones along the continents are of great economic importance, and they account for most organic carbon burial. The carbon cycle in many coastal zones is influenced by the sediments and dissolved nutrients introduced by rivers. However, there is little direct evidence for a regional marine response to changes in river dynamics. Here we present a suite of high-resolution records of organic and inorganic paleoceanographic proxies, which together demonstrate that past changes in Indus River discharge have strongly affected productivity patterns in the coastal northeastern Arabian Sea. Anthropogenic activity, including the building of dams and irrigation facilities during the past century, has drastically decreased the discharge rate of the Indus River. Between A.D. 1890 and 1998, the period over which this reduction occurred, primary productivity off the Pakistan coast seems to have decreased by more than one-third. Over the same period, the regional oxygen minimum zone weakened, increasing the supply of oxygen to the sediments, leaving the expected imprint on a suite of redox-sensitive elements and reducing the preservation of organic matter.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 5
Title: Impact of Indus River discharge on productivity and preservation of organic carbon in the Arabian Sea over the twentieth century
Affiliation: Bundesanstalt fuer Geowissenschaften und Rohstoffe, Hanover, Germany
Pages: 399-402
Published: 20120326
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 35
Accession Number: 2012-100772
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012123; accessed on April 9, 2012
Illustration Description: illus. incl. sketch map
Source Medium: WWW
N22°00'00" - N24°00'00", E65°00'00" - E67°00'00"
Secondary Affiliation: ETH Zuerich, CHE, SwitzerlandUniversity of Tuebingen, DEU, GermanyInstitut fuer Angewandte Geophysik, DEU, GermanyAlfred Wegener Institute for Polar and Marine Research, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201252
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