Q93. With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct?
- OMT is measured up to a depth of 26°C isotherm which is 129 meters in the south-western Indian Ocean during January – March.
- OMT collected during January March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean
Select the correct answer using the code given below
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Answer: B
- Statement 1 is not correct: The Ocean Mean Temperature (OMT) is measured up to a depth of 26 degrees C isotherm, is more stable and consistent, and the spatial spread is also less. The 26-degree C isotherm is seen at depths varying from 50 –100 meters. During January –March, the mean 26-degree C isotherm depth in the Southwestern Indian Ocean is 59 meters.
- Statement 2 is correct: With OMT, in addition to better predictive success, the information on whether the amount of monsoon rainfall will be more or less than the long-term mean will be available by the beginning of April, two months before the southwest monsoon can set in. This is because OMT is analyzed by measuring the ocean thermal energy during the period from January to March.
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