- Dona Paula, Goa, India.
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| Abstract Submission No. | ABS-2022-07-0048 |
| Title of Abstract | Inertial Dissipation Method for estimating turbulent heat fluxes from a research vessel |
| Authors | K. Vijay Kumar*, P. Mehra, Yogesh A, Ryan Luis |
| Organisation | CSIR-National Institute of Oceanography, Goa |
| Address | Dona Paula, Goa Panaji, Goa, India Pincode: 403004 Mobile: 9637466582 E-mail: kvkumar@nio.org |
| Country | India |
| Presentation | Oral |
| Abstract | The heat fluxes (latent and sensible) are needed for a variety of purposes in meteorology and oceanography, for example, weather forecast, cloud process and mixed layer modeling. There are four standard methods for determining these fluxes, namely 1) eddy covariance or eddy correlation, 2) inertial-dissipation, 3) mean profiles, and 4) bulk aerodynamic methods. The fluxes over the oceans result from turbulence, and the eddy covariance method (ECM) is the most direct way of measuring them from in-situ observations, and is considered to provide an unbiased estimate of the fluxes. In other three methods, some amount of empiricism is built-in and appropriate relations or coefficients are to be determined. For the ECM, however, platform motion needs to be accounted for to get true fluxes. The Inertial Dissipation Method (IDM) relies on measurement at high frequency unaffected by the ship/platform motion. This method is a good compromise, being insensitive to the platform motions, and up to some extend of flow distortion. It provide more direct estimate than the bulk (BM) simply because it accounts for the turbulence statistics; thus it is desirable for obtaining considerable amount of data under various atmospheric and sea state conditions over the ocean. In the present study, two sets of data obtained from two cruises (one in the Arabian Sea, and other in the Bay of Bengal) are used to estimate latent, sensible heat fluxes and momentum flux using the IDM. The inter-comparison between the IDM,ECM and BM are made and preliminary results are presented. |