LONG-TERM MEMORY BEHAVIORS FOR OUTGOING LONGWAVE RADIATION IN THE TROPICS
Abstract：In order to explore inner change patterns of OLR over the tropics,daily outgoing longwave radiation (OLR) records (1979-2010) from NOAA are analyzed by using the detrended fluctuation analysis (DFA) method.The results indicate that the OLR over the tropics is power-law correlation and the value of scaling exponents is between 0.65 and 0.72 in most of the cases.Therefore,the OLR has strong long-range correlation (or consistency).The value of the OLR mainly depends on the cloud-top temperature and cloudiness due to strong convection in the western Pacific,the Congo Basin and South America.The clouds of these are asvary rapidly,which results in a weak long-term memory of the OLR in these regions.While the value of the OLR in the Middle East Pacific,Atlantic Ocean and Sahara Desert mainly relys on the sea surface or the land surface temperature,since the sea surface or land surface temperature barely change,which makes the OLR show a strong long-term memory.In addition,the long-term memory behaviors of the OLR in the tropics are caused by the fractal characteristics of time series,and further proved by randomly disrupting the time series to remove trends and correlation.
Keywords：outgoing longwave radiationlong-term memorydetrended fluctuation analysis (DFA)
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 426-432 )