Bay of Bengal intraseasonal oscillations and the 2018 monsoon onset

dc.contributor.author Shroyer, Emily L.
dc.contributor.author Tandon, Amit
dc.contributor.author Sengupta, Debasis
dc.contributor.author Fernando, Harindra J. S.
dc.contributor.author Lucas, Andrew J.
dc.contributor.author Farrar, J. Thomas
dc.contributor.author Chattopadhyay, Rajib
dc.contributor.author de Szoeke, Simon P.
dc.contributor.author Flatau, Maria
dc.contributor.author Rydbeck, Adam
dc.contributor.author Wijesekera, Hemantha W.
dc.contributor.author McPhaden, Michael J.
dc.contributor.author Seo, Hyodae
dc.contributor.author Subramanian, Aneesh C.
dc.contributor.author Venkatesan, Ramasamy
dc.contributor.author Joseph, Jossia K.
dc.contributor.author Ramsundaram, S.
dc.contributor.author Gordon, Arnold L.
dc.contributor.author Bohman, Shannon M.
dc.contributor.author Pérez, Jaynise
dc.contributor.author Simoes-Sousa, Iury T.
dc.contributor.author Jayne, Steven R.
dc.contributor.author Todd, Robert E.
dc.contributor.author Bhat, G. S.
dc.contributor.author Lankhorst, Matthias
dc.contributor.author Schlosser, Tamara L.
dc.contributor.author Adams, Katherine
dc.contributor.author Jinadasa, S. U. P.
dc.contributor.author Mathur, Manikandan
dc.contributor.author Mohapatra, Mrutyunjay
dc.contributor.author Rama Rao, E. Pattabhi
dc.contributor.author Sahai, Atul Kumar
dc.contributor.author Sharma, Rashmi
dc.contributor.author Lee, Craig
dc.contributor.author Rainville, Luc
dc.contributor.author Cherian, Deepak A.
dc.contributor.author Cullen, Kerstin
dc.contributor.author Centurioni, Luca R.
dc.contributor.author Hormann, Verena
dc.contributor.author MacKinnon, Jennifer A.
dc.contributor.author Send, Uwe
dc.contributor.author Anutaliya, Arachaporn
dc.contributor.author Waterhouse, Amy F.
dc.contributor.author Black, Garrett S.
dc.contributor.author Dehart, Jeremy A.
dc.contributor.author Woods, Kaitlyn M.
dc.contributor.author Creegan, Edward
dc.contributor.author Levy, Gad
dc.contributor.author Kantha, Lakshmi
dc.contributor.author Subrahmanyam, Bulusu
dc.date.accessioned 2022-02-15T22:26:40Z
dc.date.available 2022-04-01T06:22:14Z
dc.date.issued 2021-10-01
dc.description Author Posting. © American Meteorological Society, 2021. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Bulletin of the American Meteorological Society 102(10), (2021): E1936–E1951, https://doi.org/10.1175/BAMS-D-20-0113.1. en_US
dc.description.abstract In the Bay of Bengal, the warm, dry boreal spring concludes with the onset of the summer monsoon and accompanying southwesterly winds, heavy rains, and variable air–sea fluxes. Here, we summarize the 2018 monsoon onset using observations collected through the multinational Monsoon Intraseasonal Oscillations in the Bay of Bengal (MISO-BoB) program between the United States, India, and Sri Lanka. MISO-BoB aims to improve understanding of monsoon intraseasonal variability, and the 2018 field effort captured the coupled air–sea response during a transition from active-to-break conditions in the central BoB. The active phase of the ∼20-day research cruise was characterized by warm sea surface temperature (SST > 30°C), cold atmospheric outflows with intermittent heavy rainfall, and increasing winds (from 2 to 15 m s−1). Accumulated rainfall exceeded 200 mm with 90% of precipitation occurring during the first week. The following break period was both dry and clear, with persistent 10–12 m s−1 wind and evaporation of 0.2 mm h−1. The evolving environmental state included a deepening ocean mixed layer (from ∼20 to 50 m), cooling SST (by ∼1°C), and warming/drying of the lower to midtroposphere. Local atmospheric development was consistent with phasing of the large-scale intraseasonal oscillation. The upper ocean stores significant heat in the BoB, enough to maintain SST above 29°C despite cooling by surface fluxes and ocean mixing. Comparison with reanalysis indicates biases in air–sea fluxes, which may be related to overly cool prescribed SST. Resolution of such biases offers a path toward improved forecasting of transition periods in the monsoon. en_US
dc.description.embargo 2022-04-01 en_US
dc.description.sponsorship This work was supported through the U.S. Office of Naval Research’s Departmental Research Initiative: Monsoon Intraseasonal Oscillations in the Bay of Bengal, the Indian Ministry of Earth Science’s Ocean Mixing and Monsoons Program, and the Sri Lankan National Aquatic Resources Research and Development Agency. We thank the Captain and crew of the R/V Thompson for their help in data collection. Surface atmospheric fields included fluxes were quality controlled and processed by the Boundary Layer Observations and Processes Team within the NOAA Physical Sciences Laboratory. Forecast analysis was completed by India Meteorological Department. Drone image was taken by Shreyas Kamat with annotations by Gualtiero Spiro Jaeger. We also recognize the numerous researchers who supported cruise- and land-based measurements. This work represents Lamont-Doherty Earth Observatory contribution number 8503, and PMEL contribution number 5193. en_US
dc.identifier.citation Shroyer, E., Tandon, A., Sengupta, D., Fernando, H. J. S., Lucas, A. J., Farrar, J. T., Chattopadhyay, R., de Szoeke, S., Flatau, M., Rydbeck, A., Wijesekera, H., McPhaden, M., Seo, H., Subramanian, A., Venkatesan, R., Joseph, J., Ramsundaram, S., Gordon, A. L., Bohman, S. M., Pérez, J., Simoes-Sousa, I. T., Jayne, S. R., Todd, R. E., Bhat, G. S., Lankhorst, M., Schlosser, T., Adams, K., Jinadasa, S. U. P., Mathur, M., Mohapatra, M., Rama Rao, E. P., Sahai, A. K., Sharma, R., Lee, C., Rainville, L., Cherian, D., Cullen, K., Centurioni, L. R., Hormann, V., MacKinnon, J., Send, U., Anutaliya, A., Waterhouse, A., Black, G. S., Dehart, J. A., Woods, K. M., Creegan, E., Levy, G., Kantha, L. H., & Subrahmanyam, B. (2021). Bay of Bengal intraseasonal oscillations and the 2018 monsoon onset. Bulletin of the American Meteorological Society, 102(10), E1936–E1951. en_US
dc.identifier.doi 10.1175/BAMS-D-20-0113.1
dc.identifier.uri https://hdl.handle.net/1912/28008
dc.publisher American Meteorological Society en_US
dc.relation.uri https://doi.org/10.1175/BAMS-D-20-0113.1
dc.subject Atmosphere-ocean interaction en_US
dc.subject Monsoons en_US
dc.subject In situ atmospheric observations en_US
dc.subject In situ oceanic observations en_US
dc.title Bay of Bengal intraseasonal oscillations and the 2018 monsoon onset en_US
dc.type Article en_US
dspace.entity.type Publication
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