Response of Aerosol Direct Radiative Effect to the East Asian Summer Monsoon

Asian summer monsoon and atmospheric aerosol simultaneously influence the climate in the East Asian region. However, substantial uncertainties exist in the current understanding of the interactions between monsoon and aerosol and their combined effects. Previous studies have shown that aerosols influence the strength of monsoon and monsoon-related water cycles; however, monsoon strongly regulates the aerosol spatial distribution. This letter investigates the radiative flux response at the top of the atmosphere to the Asian summer monsoon by using observations made by the Clouds and Earth's Radiant Energy System and the Moderate Resolution Imaging Spectroradiometer. In comparison with the ten-year (2002-2011) mean climatology, the aerosol radiative effect is estimated over two eastern Asia regions for the months of July in 2002 and 2003, corresponding to a weak and a strong summer monsoon event, respectively. The dramatically different influences show the aerosol radiative forcing over land to be strongly responsive to Asian summer monsoon. Furthermore, the reanalysis-based estimate of the aerosol radiative effect is consistent with its observation-only counterpart.

[1]  M. Chin,et al.  A review of measurement-based assessments of the aerosol direct radiative effect and forcing , 2005 .

[2]  Ka-Ming Lau,et al.  Observational relationships between aerosol and Asian monsoon rainfall, and circulation , 2006 .

[3]  J. Hansen,et al.  Climate Effects of Black Carbon Aerosols in China and India , 2002, Science.

[4]  D. F. Young,et al.  Angular Distribution Models for Top-of-Atmosphere Radiative Flux Estimation from the Clouds and the Earth's Radiant Energy System Instrument on the Tropical Rainfall Measuring Mission Satellite. Part II; Validation , 2003 .

[5]  Kyu-Myong Kim,et al.  Fingerprinting the impacts of aerosols on long‐term trends of the Indian summer monsoon regional rainfall , 2010 .

[6]  Yoram J. Kaufman,et al.  Aerosol direct radiative effect at the top of the atmosphere over cloud free ocean derived from four years of MODIS data , 2006 .

[7]  S. Kato,et al.  Top-of-Atmosphere Direct Radiative Effect of Aerosols from the Clouds and the Earth's Radiant Energy System Satellite Instrument (CERES) , 2002 .

[8]  Norman G. Loeb,et al.  Top-of-atmosphere direct radiative effect of aerosols over the Tropical Oceans from the Clouds and t , 2002 .

[9]  Ping Yang,et al.  Aerosol-cloud-precipitation relationships from satellite observations and global climate model simulations , 2012 .

[10]  S. Schubert,et al.  MERRA: NASA’s Modern-Era Retrospective Analysis for Research and Applications , 2011 .

[11]  Guang J. Zhang,et al.  Aerosol direct forcing of the summer Indian monsoon as simulated by the NCAR CAM3 , 2009 .

[12]  U. Lohmann,et al.  Global indirect aerosol effects: a review , 2004 .

[13]  Ping Yang,et al.  Study of the Impact of Summer Monsoon Circulation on Spatial Distribution of Aerosols in East Asia Based on Numerical Simulations , 2011 .

[14]  Yoram J. Kaufman,et al.  Shortwave aerosol radiative forcing over cloud‐free oceans from Terra: 2. Seasonal and global distributions , 2005 .

[15]  Sundar A. Christopher,et al.  First observational estimates of global clear sky shortwave aerosol direct radiative effect over land , 2008 .

[16]  K. Lau,et al.  Asian summer monsoon anomalies induced by aerosol direct forcing : the role of the Tibetan Plateau , 2006 .

[17]  Ping Yang,et al.  Influence of Indian Summer Monsoon on Aerosol Loading in East Asia , 2011 .

[18]  Bruce A. Wielicki,et al.  Angular Distribution Models for Top-of-Atmosphere Radiative Flux Estimation from the Clouds and the Earth's Radiant Energy System Instrument on the Tropical Rainfall Measuring Mission Satellite. Part II; Validation , 2003 .