Articles | Volume 18, issue 20
Biogeosciences, 18, 5831–5849, 2021
Biogeosciences, 18, 5831–5849, 2021

Research article 29 Oct 2021

Research article | 29 Oct 2021

Fast local warming is the main driver of recent deoxygenation in the northern Arabian Sea

Zouhair Lachkar et al.

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Cited articles

Al-Ansari, E. M., Rowe, G., Abdel-Moati, M., Yigiterhan, O., Al-Maslamani, I., Al-Yafei, M., Al-Shaikh, I., and Upstill-Goddard, R.: Hypoxia in the central Arabian Gulf Exclusive Economic Zone (EEZ) of Qatar during summer season, Estuarine, Coast. Shelf Sci., 159, 60–68, 2015. a
Al-Rashidi, T. B., El-Gamily, H. I., Amos, C. L., and Rakha, K. A.: Sea surface temperature trends in Kuwait bay, Arabian Gulf, Nat. Hazard., 50, 73–82, 2009. a
Al-Yamani, F. and Naqvi, S.: Chemical oceanography of the Arabian Gulf, Deep-Sea Res. Pt. II, 161, 72–80, 2019. a
Bange, H. W., Naqvi, S. W. A., and Codispoti, L.: The nitrogen cycle in the Arabian Sea, Prog. Oceanogr., 65, 145–158, 2005. a
Banse, K., Naqvi, S. W. A., Narvekar, P. V., Postel, J. R., and Jayakumar, D. A.: Oxygen minimum zone of the open Arabian Sea: variability of oxygen and nitrite from daily to decadal timescales, Biogeosciences, 11, 2237–2261,, 2014. a
Short summary
This study documents and quantifies a significant recent oxygen decline in the upper layers of the Arabian Sea and explores its drivers. Using a modeling approach we show that the fast local warming of sea surface is the main factor causing this oxygen drop. Concomitant summer monsoon intensification contributes to this trend, although to a lesser extent. These changes exacerbate oxygen depletion in the subsurface, threatening marine habitats and altering the local biogeochemistry.
Final-revised paper