Open AccessObserved and modeled evolution of the tropical mean radiation budget at the top of the atmosphere since 1985
Author(s) -
Andronova Natalia,
Penner Joyce E.,
Wong Takmeng
Publication year - 2009
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 - 10.1029/2008jd011560
Subject(s) - atmosphere (unit) , shortwave radiation , longwave , shortwave , environmental science , climatology , atmospheric sciences , radiative transfer , climate model , outgoing longwave radiation , atmospheric model , climate change , radiation , meteorology , geology , physics , oceanography , convection , quantum mechanics
We have used satellite‐based broadband radiation observations to construct a long‐term continuous 1985–2005 record of the radiative budget components at the top of the atmosphere for the tropical region (20°S–20°N). On the basis of the constructed record we have derived the most conservative estimate of their trends. We compared the interannual variability of the net radiative fluxes at the top of the tropical atmosphere with model simulations from the Intergovernmental Panel on Climate Change fourth assessment report (AR4) archive available up to 2000 and showed that most of the models capture the 1991 Mount Pinatubo eruption signal in both its timing and amplitude; however, none of them simulate the observed trends. Further comparison showed that among the “best skilled” models, which are those that showed the highest value of the correlation in simulating one or all of the observed net, shortwave, and longwave radiative fluxes at the top of the atmosphere, the model with an equilibrium climate sensitivity ∼3.4°C for the doubling CO 2 represents the observed amplifying total feedback effect in the tropical atmosphere better than the models with a climate sensitivity ∼2.7°C or 4.3°C. This total feedback effect was calculated on the basis of an assumed simplified system of interactions between the near‐surface temperature and the net radiation at the top of the atmosphere.