Intraseasonal variability of air-sea fluxes over the Bay of Bengal during the southwest monsoon

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Sanchez-Franks, A., Kent, E. C., Matthews, A. J., Webber, B. G. M., Peatman, S. C. and Vinayachandran, P. N. (2018) Intraseasonal variability of air-sea fluxes over the Bay of Bengal during the southwest monsoon. Journal of Climate, 31 (17). pp. 7087-7109. ISSN 1520-0442 doi: 10.1175/JCLI-D-17-0652.1

Abstract/Summary

In the Bay of Bengal (BoB), surface heat fluxes play a key role in monsoon dynamics and prediction. The accurate representation of large-scale surface fluxes is dependent on the quality of gridded reanalysis products. Meteorological and surface flux variables from five reanalysis products are compared and evaluated against in situ data from the RAMA moored array in the BoB. The reanalysis products: ERA-Interim (ERA-I), TropFlux, MERRA-2, JRA-55 and CFSR are assessed for their characterisation of air-sea fluxes during the southwest monsoon season (JJAS). ERA-I captured radiative fluxes best while TropFlux captured turbulent and net heat fluxes (Qnet) best, and both products outperformed JRA-55, MERRA-2 and CFSR, showing highest correlations and smallest biases when compared to the in situ data. In all five products, the largest errors were in shortwave radiation (QSW) and latent heat flux (QLH), with non-negligible biases up to ∼75 W m−2. The QSW and QLH are the largest drivers of the observed Qnet variability, thus highlighting the importance of the results from the buoy comparison. There are also spatially coherent differences in the mean basin-wide fields of surface flux variables from the reanalysis products, indicating that the biases at the buoy position are not localized. Biases of this magnitude have severe implications on reanalysis products ability to capture the variability of monsoon processes. Hence, the representation of intraseasonal variability was investigated through the boreal summer intraseasonal oscillation and we found that TropFlux and ERA-I perform best at capturing intraseasonal climate variability during the southwest monsoon season.

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Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/77492
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > NCAS Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	American Meteorological Society
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Funders:	Natural Environment Research Council Natural Environment Research Council	The sponsoring bodies who contributed funding for the creation of this item. Example: NERC Example: The Royal Society of Chemistry A pick list of funders may appear as you type in the funder's name in full or as an acronym. Select a correct match to complete the field or type in a new entry in full. For new entries, the full name is preferred.
Projects:	BoBBLE: Bay of Bengal Boundary Layer Experiment Funded by: Natural Environment Research Council (NE/L013827/1 - £784,432) Project Lead: Adrian Matthews 15 January 2015 - 14 January 2020 BoBBLE: Bay of Bengal Boundary Layer Experiment Funded by: Natural Environment Research Council (NE/L013800/1 - £251,267) Local Lead (PI): Nick Klingaman Project Lead: Nicholas Pappas Klingaman 15 January 2015 - 14 January 2020	Click Add to select your project (received at Reading) from an autocomplete list.

Deposit Details

Date Deposited:	12 Jun 2018 08:52	Date item deposited into CentAUR
Last Modified:	22 Jan 2025 02:39	Date item last modified

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