Preprints
https://doi.org/10.5194/acp-2017-429
https://doi.org/10.5194/acp-2017-429
 
07 Jul 2017
07 Jul 2017
Status: this preprint was under review for the journal ACP but the revision was not accepted.

Estimating the effects of aerosol, cloud, and water vapor on the recent brightening in India during the monsoon season

Feiyue Mao1,2, Zengxin Pan1, Wei Wang1, Xin Lu1, and Wei Gong1,3 Feiyue Mao et al.
  • 1State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
  • 2School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
  • 3Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China

Abstract. India is experiencing a leveling-off trend of solar radiation, even a transition from dimming to brightening. This process is significantly complicated because of the active atmospheric action during monsoon season. In this study, we use observations from multiple sensors in the A-Train satellite constellation to evaluate the effects of aerosol, cloud, and water vapor variations on recent changes of solar radiation during monsoon season (June–September) in India from 2006 to 2015. The results show that the increase in aerosol optical depth is paradoxical with the variation of surface shortwave radiation in India. Instead, the decreases in water vapor amount and clouds significantly contribute to the brightening, further affecting the surface warming in India. In general, clouds are reduced and thinned by approximately 9.4 % and 182 m when cloud water path (by 53.4 g m−2) and particle number concentration in cloud-sky condition decrease. The corresponding change of clouds weakens the shortwave cloud radiative effect in surface by approximately 45.5 W m−2. Moreover, the precipitable water in clear-sky decreases by approximately 3.0 mm over the brightening period. Consequently, solar brightening increases by roughly 2.8 W m−2 owing to its weakened absorption. Overall, the decreases in water vapor and clouds result in the increased absorption of direct solar radiation in surface and subsequent surface brightening.

Feiyue Mao et al.

Feiyue Mao et al.

Feiyue Mao et al.

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