The world’s largest coastal deoxygenation zone is not anthropogenically driven
| Autor: | N.V.H.K. Chari, Ch.V. Ramu, K.K. Balachandran, Sanjeev Kumar, R. Jyothibabu, Kausar F. Bepari, G.V.M. Gupta, B. Bikram Reddy, A.Yudhistir Reddy, Anil Kumar Vijayan, V. Sudheesh, Prachi Hemant Marathe |
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| Rok vydání: | 2021 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Renewable Energy Sustainability and the Environment Public Health Environmental and Occupational Health Estuary Marine life 010501 environmental sciences Monsoon Oxygen minimum zone 01 natural sciences Natural (archaeology) Oceanography Environmental science Upwelling Submarine pipeline Deoxygenation 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Environmental Research Letters. 16:054009 |
| ISSN: | 1748-9326 |
| DOI: | 10.1088/1748-9326/abe9eb |
| Popis: | The growing number of oxygen-deficient coastal zones around the world and their impacts on marine life has always been a controversial issue as their development is largely attributed to anthropogenic activities which can be mitigated by human actions. However, contrary to this prevailing understanding, we show here for the first time, using new coherent datasets from estuaries to coastal to offshore regions, that the world’s largest hypoxic-anoxic zone along the west coast of India is formed through a natural process, i.e. upwelling of deoxygenated waters during the summer monsoon. We further demonstrate that the persistence and extent of this coastal oxygen deficiency depend on the degree of deoxygenation of source waters for the upwelling. Consequently, the anoxia is confined only to the central shelf between 11° and 18° N, which is equivalent to almost half of the western Indian shelf, where upwelling brings suboxic waters from the core oxygen minimum zone in the Arabian Sea. |
| Databáze: | OpenAIRE |
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