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Cloud and radiative heating profiles associated with the boreal summer intraseasonal oscillation

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The cloud water content (CW) and radiative heating rate (QR) structures related to northward propagating boreal summer intraseasonal oscillations (BSISOs) are analyzed using data from A-train satellites in conjunction with the ERA-Interim reanalysis. It is found that the northward movement of CW- and QR anomalies are closely synchronized with the northward movement of BSISO precipitation maxima. Commensurate with the northward propagating BSISO precipitation maxima, the CW anomalies exhibit positive ice (liquid) CW maxima in the upper (middle/low) troposphere with a prominent tilting structure in which the low-tropospheric (upper-tropospheric) liquid (ice) CW maximum leads (lags) the BSISO precipitation maximum. The BSISO-related shortwave heating (QSW) heats (cools) the upper (low) troposphere; the longwave heating (QLW) cools (heats) the upper (middle/low) troposphere. The resulting net radiative heating (QRN), being dominated by QLW, cools (heats) the atmosphere most prominently above the 200 hPa level (below the 600 hPa level). Enhanced clouds in the upper and middle troposphere appears to play a critical role in increasing low-level QLW and QRN. The vertically-integrated QSW, QLW and QRN are positive in the region of enhanced CW with the maximum QRN near the latitude of the BSISO precipitation maximum. The bottom-heavy radiative heating anomaly resulting from the cloud-radiation interaction may act to strengthen convection.

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This study was supported by Indian National Monsoon Mission. J. Kim, J.M. Neena and X. Jiang acknowledge the support of JIFRESSE-UCLA. X. Jiang acknowledges support by US NSF Climate and Large-Scale Dynamics Program under Award AGS-1228302, and NOAA Climate Program Office under Awards NA12OAR4310075, NA15OAR4310098, and NA15OAR4310177. Contributions of D. Waliser and G. Cesana were carried out on behalf of the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA, including support from the NASA Modeling, Analysis and Prediction Program.

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Correspondence to Jinwon Kim.

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Kim, J., Waliser, D.E., Cesana, G.V. et al. Cloud and radiative heating profiles associated with the boreal summer intraseasonal oscillation. Clim Dyn 50, 1485–1494 (2018).

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