Open AccessFirst observation‐based estimates of cloud‐free aerosol radiative forcing across China
Author(s) -
Li Zhanqing,
Lee KwonHo,
Wang Yuesi,
Xin Jinyuan,
Hao WeiMin
Publication year - 2010
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2009jd013306
Subject(s) - atmosphere (unit) , aerosol , environmental science , radiative forcing , atmospheric sciences , albedo (alchemy) , cloud albedo , forcing (mathematics) , radiative transfer , atmospheric model , satellite , climatology , meteorology , cloud cover , cloud computing , physics , geology , art , quantum mechanics , astronomy , performance art , computer science , art history , operating system
Heavy loading of aerosols in China is widely known, but little is known about their impact on regional radiation budgets, which is often expressed as aerosol radiative forcing (ARF). Cloud‐free direct ARF has either been estimated by models across the region or determined at a handful of locations with aerosol and/or radiation measurements. In this study, ARF is determined at 25 stations distributed across China where aerosol optical thickness has been measured since 2004. In combination with the single‐scattering albedo retrieved from ground and satellite measurements, ARF was determined at all the stations at the surface, inside the atmosphere, and at the top of atmosphere (TOA). Nationwide annual and diurnal mean ARF is found to be −15.7 ± 8.9 at the surface, 0.3 ± 1.6 at the TOA, and 16.0 ± 9.2 W m −2 inside the atmosphere. These values imply that aerosols have very little impact on the atmosphere‐surface system but substantially warm up the atmosphere at the expense of cooling the surface. The strong atmospheric absorption is likely to alter atmospheric thermodynamic conditions and thus affects circulation considerably.