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Latent heat flux variation during the warming phase of intraseasonal oscillations over northern Bay of Bengal

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Abstract

The sensitivity of latent heat flux to the warming phase of intra-seasonal oscillation in the Bay of Bengal is studied with the help of in-situ data. This was analyzed from 2012 to 2015 with the help of data obtained from moored buoys deployed in the northern Bay of Bengal. The annual secondary peaks in sea surface temperature is observed in the northern Bay of Bengal associated with the warming phase of the intra-seasonal oscillation during southwest monsoon season, with net heat flux dominantly governing the mixed layer temperature. An increase in the release of latent heat flux from the northern bay is observed with the warming phase of intra-seasonal oscillation, which again leads to cooling of sea surface temperature. Higher latent heat flux release associated with the intra-seasonal warming phase during southwest monsoon season has intrigued us to study the sensitivity of latent heat flux with sea surface temperature. The sensitivity of gradient in saturation specific humidity is comparatively higher than the sensitivity of wind speed to sea surface temperature variations during southwest monsoon season. The gradient in sea–air saturation specific humidity is largely driven by saturation specific humidity of air (Qa) during both the seasons. However, the correlation of gradient in saturation specific humidity with surface saturation specific humidity is higher during southwest monsoon season compared to northeast monsoon season. Thus, the warming phase of sea surface temperature associated with intra-seasonal oscillation during southwest monsoon season always lead to an increase in latent heat flux release, favoured by high sensitivity of surface saturation specific humidity to variations in sea surface temperature.

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References

  • Bhat G S 2003 Measurement of air sea fluxes over the Indian Ocean and the Bay of Bengal; J. Clim. 16(4) 767–775.

    Article  Google Scholar 

  • Fairall C W, Bradley E F, Hare J E, Grachev A A and Edson J B 2003 Bulk parameterization on air–sea fluxes: updates and verification for the COARE algorithm; J. Clim. 16 571–591.

    Article  Google Scholar 

  • Fu X, Wang B, Li T and McCreary J P 2003 Coupling between northward propagating intra-seasonal oscillations and sea surface temperature in the Indian Ocean; J. Atmos. Sci. 60(15) 1733–1783.

    Article  Google Scholar 

  • Girishkumar M S, Joseph J, Thangaprakash V P, Pottapinjara V and McPhaden M J 2017 Mixed layer temperature budget for the northward propagating summer monsoon intra-seasonal oscillation (MISO) in the central Bay of Bengal; J. Geophys. Res. 122(11) 8841–8854.

    Article  Google Scholar 

  • Goswami B N 2005 Intraseasonal variability in the atmosphere–ocean climate system (eds) Lau W K M and Waliser D E, Berlin, Praxis-Springer, South Asian Monsoon, pp. 19–55.

  • Goswami B N and Ajayamohan R S 2001 Intra-seasonal oscillations and interannual variability of the Indian summer monsoon; J. Clim. 14 1180–1198.

    Article  Google Scholar 

  • Jayakumar A, Turner A, Johnson S, Rajagopal E, Mohandas S and Mitra A 2017 Boreal summer sub-seasonal variability of the South Asian monsoon in the met office GloSea5 initialized coupled model; Clim. Dyn. 49(5–6) 2035–2059.

    Article  Google Scholar 

  • Joseph P V and Sabin T P 2008 An ocean–atmosphere interaction mechanism for the active break cycle of the Asian summer monsoon; Clim. Dyn. 30(6) 553–566.

    Article  Google Scholar 

  • Kumar B P, Cronin M F, Joseph S, Ravichandran M and Suresh Kumar N 2017 Latent heat flux sensitivity to sea surface temperature: regional perspectives; J. Clim. 30(1) 129–143.

    Article  Google Scholar 

  • Parampil S R, Anita G, Ravichandran M and Sengupta D 2010 Intraseasonal response of mixed layer temperature and salinity in the Bay of Bengal to heat and freshwater flux; J. Geophys. Res. https://doi.org/10.1029/2009jc005790.

    Article  Google Scholar 

  • Parampil S R, Bharathraj G N, Harrison M and Sengupta D 2016 Observed sub-seasonal variability of heat flux and SST response of the tropical Indian Ocean; J. Geophys. Res. 121(10) 7290–7307.

    Article  Google Scholar 

  • Premkumar K, Ravichandran M, Kalsi S R, Sengupta D and Gadgil S 1999 First results from new observational system over the Indian Seas; Curr. Sci. 78(3) 323–330.

    Google Scholar 

  • Rahman H and Ravichandran M 2013 Evaluation of near-surface air temperature and specific humidity from hybrid global products and their impact on latent heat flux in the Northern Indian Ocean; J. Geophys. Res. 118(2) 1034–1047.

    Article  Google Scholar 

  • Rao R R and Sivakumar R 2003 Seasonal variability of sea surface salinity and salt budget of the mixed layer of the northern Indian ocean; J. Geophys. Res. 108(C1) 3009, https://doi.org/10.1029/2001jc000907.

    Article  Google Scholar 

  • Roxy M K 2014 Sensitivity of precipitation to sea surface temperature over the tropical summer monsoon region and its quantification; Clim. Dyn. 43(5–6) 1159–1169.

    Article  Google Scholar 

  • Roxy M K and Tanimoto Y 2007 Role of SST over the Indian Ocean in influencing the intra-seasonal variability of the Indian summer monsoon; J. Meteor. Soc. Japan 85(3) 349–358.

    Article  Google Scholar 

  • Sengupta D and Ravichandran M 2001 Oscillations of Bay of Bengal sea surface temperature during the 1998 summer monsoon; Geophys. Res. Lett. 28(10) 2033–2036.

    Article  Google Scholar 

  • Sengupta D, Goswami B N and Senan R 2001 Coherent intraseasonal oscillations of ocean and atmosphere during the Asian summer mnsoon; Geophys. Res. Lett. 28(21) 4127–4130.

    Article  Google Scholar 

  • Shenoi S S C, Shankar D and Shetye S R 2002 Differences in heat budgets of the near-surface Arabian Sea and Bay of Bengal: implications for the summer monsoon; J. Geophys. Res. 107(C6) 1–14.

    Google Scholar 

  • Thangaprakash V P, Girishkumar M S, Suprit K, Suresh Kumar N, Chaudhuri D, Dinesh K, Kumar A, Shivaprasad S, Ravichandran M, Farrar J T, Sundar R and Weller R A 2016 What controls seasonal evolution of sea surface temperature in the Bay of Bengal? Mixed layer heat budget analysis using moored buoy observations along 90°E; Oceanography 29(2) 202–213.

    Article  Google Scholar 

  • Venkatesan R, Shamji V R, Latha G, Mathew S, Rao R R, Muthiah M A and Atmanand M A 2013 In-situ ocean observation time series measurements from OMNI buoy network in the Bay of Bengal; Curr. Sci. 104(9) 1166–1177.

    Google Scholar 

  • Vialard J, Jayakumar A, Gnanaseelan C, Lengaigne M, Sengupta D and Goswami B N 2012 Processes of 30–90 days of sea surface temperature variability in the northern Indian Ocean during boreal summer; Clim. Dyn. 38(9–10) 1901–1916.

    Article  Google Scholar 

  • Vinaychandran P N, Neema C P, Mathew S and Remya R 2012 Mechanisms of summer intra-seasonal sea surface temperature oscillations in the Bay of Bengal; Geophys. Res. Lett. 117(C01005) 1–15.

    Google Scholar 

  • Weller R A, Farrar T J, Buckley J, Mathew S, Venkatesan R, Sree Lekha J, Chaudhari D, Suresh Kumar N and Praveen Kumar B 2016 Air–sea interaction in the Bay of Bengal; Oceanography 29 (2) 28–37.

    Article  Google Scholar 

  • Zhang G J and McPhaden M J 1995 The relationship between sea surface temperature and latent heat flux in the equatorial Pacific; J. Clim. 8(3) 589–605.

    Article  Google Scholar 

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Acknowledgements

Our sincere thanks are due to Dr Robert Weller (WHOI, USA), for guiding us through the analysis. We sincerely thank the technical staff of Ocean Observation Systems of NIOT, for the continuous efforts for maintaining the moorings at sea. Thanks are due to MoES for all the support provided through various training programs.

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Authors and Affiliations

  1. Centre for Water Resources, Anna University, Guindy Campus, Chennai, 600 025, India

    Simi Mathew

  2. National Institute of Ocean Technology, Pallikaranai P.O, Chennai, 600 100, India

    G Latha & R Venkatesan

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  1. Simi Mathew
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  2. G Latha
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  3. R Venkatesan
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Correspondence to Simi Mathew.

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Communicated by C. Gnanaseelan

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Mathew, S., Latha, G. & Venkatesan, R. Latent heat flux variation during the warming phase of intraseasonal oscillations over northern Bay of Bengal. J Earth Syst Sci 129, 70 (2020). https://doi.org/10.1007/s12040-019-1338-8

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  • DOI: https://doi.org/10.1007/s12040-019-1338-8

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