First evidence of denitrification vis-à-vis monsoon in the Arabian Sea since Late Miocene

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First evidence of denitrification vis-à-vis monsoon in the Arabian Sea since Late Miocene. / IODP Expedition 355 Scientists.

In: Scientific Reports, Vol. 7, 43056, 21.02.2017.

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@article{b522d7c52701489ba3048f0d33c8dae3,
title = "First evidence of denitrification vis-{\`a}-vis monsoon in the Arabian Sea since Late Miocene",
abstract = "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.",
author = "{IODP Expedition 355 Scientists} and Shubham Tripathi and Manish Tiwari and Jongmin Lee and Khim, {Boo Keun} and Pandey, {Dhananjai K.} and Clift, {Peter D.} and Kulhanek, {Denise K.} and Sergio And{\`o} and Bendle, {James A.P.} and Sophia Aharonovich and Griffith, {Elizabeth M.} and Gurumurthy, {Gundiga P.} and Annette Hahn and Masao Iwai and Anil Kumar and {Ganesh Kumar}, A. and Liddy, {Hannah M.} and Huayu Lu and Lyle, {Mitchell W.} and Ravi Mishra and Tallavajhala Radhakrishna and Routledge, {Claire M.} and Rajeev Saraswat and Rakesh Saxena and Giancarlo Scardia and Sharma, {Girish K.} and Singh, {Arun D.} and Stephan Steinke and Kenta Suzuki and Lisa Tauxe and Zhaokai Xu and Zhaojie Yu",
year = "2017",
month = feb,
day = "21",
doi = "10.1038/srep43056",
language = "English",
volume = "7",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",

}

RIS

TY - JOUR

T1 - First evidence of denitrification vis-à-vis monsoon in the Arabian Sea since Late Miocene

AU - IODP Expedition 355 Scientists

AU - Tripathi, Shubham

AU - Tiwari, Manish

AU - Lee, Jongmin

AU - Khim, Boo Keun

AU - Pandey, Dhananjai K.

AU - Clift, Peter D.

AU - Kulhanek, Denise K.

AU - Andò, Sergio

AU - Bendle, James A.P.

AU - Aharonovich, Sophia

AU - Griffith, Elizabeth M.

AU - Gurumurthy, Gundiga P.

AU - Hahn, Annette

AU - Iwai, Masao

AU - Kumar, Anil

AU - Ganesh Kumar, A.

AU - Liddy, Hannah M.

AU - Lu, Huayu

AU - Lyle, Mitchell W.

AU - Mishra, Ravi

AU - Radhakrishna, Tallavajhala

AU - Routledge, Claire M.

AU - Saraswat, Rajeev

AU - Saxena, Rakesh

AU - Scardia, Giancarlo

AU - Sharma, Girish K.

AU - Singh, Arun D.

AU - Steinke, Stephan

AU - Suzuki, Kenta

AU - Tauxe, Lisa

AU - Xu, Zhaokai

AU - Yu, Zhaojie

PY - 2017/2/21

Y1 - 2017/2/21

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85013447125&partnerID=8YFLogxK

U2 - 10.1038/srep43056

DO - 10.1038/srep43056

M3 - Article

AN - SCOPUS:85013447125

VL - 7

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 43056

ER -