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First evidence of denitrification vis-a-vis monsoon in the Arabian Sea since late Miocene

DRS at CSIR-National Institute of Oceanography

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Title First evidence of denitrification vis-a-vis monsoon in the Arabian Sea since late Miocene
 
Creator Tripathi, S.
Tiwari, M.
Lee, J.
Khim, B.-K.
Pandey, D.K.
Clift, P.D.
Kulhanek, D.K.
Ando, S.
Bendle, J.A.P.
Aharonovich, S.
Griffith, E.M.
Gurumurthy, G.P.
Hahn, A.
Iwai, M.
Kumar, A.
Kumar, A.G.
Liddy, H.M.
Lu, H.
Lyle, M.W.
Mishra, R.
Radhakrishna, T.
Routledge, C.M.
Saraswat, R.
Saxena, R.
Scardia, G.
Sharma, G.K.
Singh, A.D.
Steinke, S.
Suzuki, K.
Tauxe, L.
Xu, Z.
Yu, Z.
 
Subject Palaeo-studies
Palaeo-studies
Geology and geophysics
Palaeo-studies
Chemistry and biogeochemistry
Oceanography and limnology
 
Description In the Arabian Sea, South Asian monsoon (SAM)-induced high surface water productivity coupled with poor ventilation of intermediate water results in strong denitrification within the oxygen minimum zone (OMZ). Despite the significance of denitrification in the Arabian Sea, we have no long-term record of its evolution spanning the past several million years. Here, we present the first record of denitrification evolution since Late Miocene (~10.2?Ma) in the Eastern Arabian Sea, where the SAM generates moderate surface water productivity, based on the samples retrieved during the International Ocean Discovery Program (IODP) Expedition 355. We find that (i) the SAM was persistently weaker from ~10.2 to 3.1 Ma; it did not intensify at ~8 Ma in contrast to a few previous studies, (ii) on tectonic timescale, both the SAM and the East Asian Monsoon (EAM) varied synchronously, (iii) the first evidence of denitrification and productivity/SAM intensification was at ~3.2–2.8 Ma that coincided with Mid-Pliocene Warm Period (MPWP), and (iv) the modern strength of the OMZ where denitrification is a permanent feature was attained at ~1.0 Ma
 
Date 2017-03-01T11:18:36Z
2017-03-01T11:18:36Z
2017
 
Type Journal Article
 
Identifier Scientific Reports, vol.7; 2017; No.43056 doi:10.1038/srep43056
http://drs.nio.org/drs/handle/2264/5106
 
Language en
 
Rights This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
 
Publisher Nature Publishing Group