Question

Why Indian Ocean have less amount of oxygen compared to other Oceans ?

Answer 1

Answer:

In the Indian Ocean, mid-depth oxygen minimum zones (OMZs) occur in the Arabian Sea and the Bay of Bengal. The lower part of the Arabian-Sea OMZ (ASOMZ; below 400 m) intensifies northward across the basin; in contrast, its upper part (above 400 m) is located in the central/eastern basin, well east of the most productive regions along the western boundary. The Bay-of-Bengal OMZ (BBOMZ), although strong, is weaker than the ASOMZ. To investigate the processes that maintain the Indian-Ocean OMZs, we obtain a suite of solutions to a coupled biological/physical model. Its physical component is a variable-density, 612-layer model, in which each layer corresponds to a distinct dynamical regime or water-mass type. Its biological component has six compartments: nutrients, phytoplankton, zooplankton, two size classes of detritus, and oxygen. Because the model grid is non-eddy resolving (0.5°), the biological model also includes a parameterization of enhanced mixing based on the eddy kinetic energy derived from satellite observations. To explore further the impact of local processes on OMZs, we also obtain analytic solutions to a one-dimensional, simplified version of the biological model.

Explanation:

Answer 2

Less oxygen is because of southern Hemisphere water is the primary supply of oxygen for the northern Indian Ocean. The ASOMZ(Arabian Sea Oxygen Minimum Zone )moves to the central/eastern basin because to advection and vertical eddy mixing. Because there is less debris along the western edge, the BBOMZ( Bay of Bengal Oxygen Minimum Zone) is weaker.

• There are two different types of dead zones in the Arabian Sea and the Bay of Bengal.
• These zones, known as oxygen-minimum zones (OMZs), are present in the open ocean naturally and range in depth from the upper layers (100-150m) to the lower boundaries (400-1000m).
• Poor vertical mixing is the main cause of these zones, according to S.W.A. Naqvi, a scientist and co-author of the paper who was formerly the director of the National Institute of Oceanography.
• Seasonal dead zones develop in shallower coastal waters when the summer southwest monsoon winds stir up deep, oxygen- and nutrient-poor waters to the surface (a process known as upwelling).
• As shown in blooms, the increase in nutrients encourages the growth of phytoplankton, small photosynthetic algae at the base of the marine food web.

#SPJ2