Dissolved Oxygen Recovery in the Oxygen Minimum Zone of the Arabian Sea in Recent Decade as Observed by BGC‐Argo Floats

作者：Tongtong Liu, Yun Qiu, Xinyu Lin, Xutao Ni, Lei Wang, Hongliang Li, Chunsheng Jing · 发表于：Geophysical Research Letters · 年份：2024 · DOI：10.1029/2024gl108841 · 被引用次数：14 · 研究领域：Oceanographic and Atmospheric Processes、Marine and coastal ecosystems、Ocean Acidification Effects and Responses

Abstract The Arabian Sea (AS) hosts the world's thickest and most intense oxygen minimum zone (OMZ), and previous studies have documented a dramatic decline of dissolved oxygen (DO) in the northeastern AS in recent decades. In this study, using the recently released data from Biogeochemical‐Argo floats, we found a surprising trend of recovery in deoxygenation within the core region of the OMZ in the AS (ASOMZ) since 2013. The average DO concentration increased by approximately threefold, from ∼0.63 μM in 2013 to ∼1.68 μM in 2022, and the thickness of the ASOMZ decreased by 13%. We find that the weakening of Oman upwelling resulting from the weakening of the summer monsoon is the main driver of oxygenation in the ASOMZ. In addition, the reduction of primary production linked to warming‐driven stratification reinforces deoxygenation recovery at depth.