Denghui JI,Minqiang ZHOU,Pucai WANG,Yang YANG,,3,Ting WANG,Xiaoyu SUN,Christian HERMANS,Bo YAO,and Gengchen WANG

1Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029, China

2Royal Belgian Institute for Space Aeronomy, Brussels 1180, Belgium

3University of Chinese Academy of Sciences, Beijing 100049, China

4Meteorological Observation Center, China Meteorological Administration, Beijing 100081, China

“Diurnal variation of CH4 at the surface from spring to winter.The time units are in local time (+8 h UTC).The error bar is 1σ for all the observed hourly mean data within that season at that local time.” in the caption of Fig.8 on Page 604 should be “Diurnal variation of CH4 at the surface from spring to winter.The time units are in UTC.The error bar is 1σ for all the observed hourly mean data within that season at that local time.”

“it grows slowly but continuously,peaking at 2300 LT,before decreasing rapidly until 0600 LT the next day.However,in winter,there was no apparent difference in the CH4 mole fraction between daytime and nighttime;it increased between 0600 and 1500 LT and was stable between 1500 and 2400 LT,after which it decreased as in all other seasons.” in Section 4.3 on Page 604 should be “it grows slowly but continuously,peaking at 2300 UTC,before decreasing rapidly until 0600 UTC the next day.However,in winter,there was no apparent difference in the CH4 mole fraction between daytime and nighttime;it increased between 0600 UTC and 1500 UTC and was stable between 1500 and 2400 UTC,after which it decreased as in all other seasons.”

“The CH4 mole fraction near the ground reached its maximum value near midnight (～2200-2300 LT),with its minimum value occurring at 0600-0700 LT.The daily maximum values in summer were relatively higher than in other seasons,at nearly 2.4 ppm.” in Conclusions on Page 606 should be “The CH4 mole fraction near the ground reached its maximum value near sunrise (～2200-2300 UTC),with its minimum value occurring at 0600-0700 UTC.The daily maximum values in summer were relatively higher than in other seasons,at nearly 2.4 ppm.”