Variability of upper ocean thermohaline structure during a MJO event from DYNAMO aircraft observations

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Alappattu, D. P., Wang, Q., Kalogiros, J., Guy, N., & Jorgensen, D. P. (2017). Variability of upper ocean thermohaline structure during a MJO event from DYNAMO aircraft observations. Journal of Geophysical Research: Oceans, n/a-n/a. doi:10.1002/2016JC012137
Metadata
TitleVariability of upper ocean thermohaline structure during a MJO event from DYNAMO aircraft observations
AuthorsD. Alappattu, Q. Wang, J. Kalogiros, N. Guy, D. Jorgensen
AbstractThis paper reports upper ocean thermohaline structure and variability observed during the life cycle of an intense Madden Julian Oscillation (MJO) event occurred in the southern tropical Indian Ocean (14°S-Eq, 70°E-81°E). Water column measurements for this study were collected using airborne expendable probes deployed from NOAA's WP-3D Orion aircraft operated as a part of Dynamics of MJO field experiment conducted during November-December, 2011. Purpose of the study is twofold; (1) to provide a statistical analysis of the upper ocean properties observed during different phases of MJO and, (2) to investigate how the upper ocean thermohaline structure evolved in the study region in response to the MJO induced perturbation. During the active phase of MJO, mixed layer depth (MLD) had a characteristic bimodal distribution. Primary and secondary modes were at ∼ 34 m and ∼ 65 m respectively. Spatial heterogeneity of the upper ocean response to the MJO forcing was the plausible reason for bimodal distribution. Thermocline and isothermal layer depth deepened respectively by 13 m and 19 m from the suppressed through the restoring phase of MJO. Thicker (> 30 m) barrier layers were found to occur more frequently in the active phase of MJO, associated with convective rainfalls. Additionally, the water mass analysis indicated that, in the active phase of this MJO event the sub-surface was dominated by Indonesian throughflow, nonetheless intrusion of Arabian Sea high saline water was also noted near the equator.
JournalJournal of Geophysical Research: Oceans
Date2017-01-01
Start pagen/a
End pagen/a
ISSN2169-9291
SubjectsDYNAMO, Madden Julian oscillation, thermohaline structure, 4572 Upper ocean and mixed layer processes, 4283 Water masses, 4262 Ocean observing systems, 3339 Ocean/atmosphere interactions

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