EMI南极臭氧柱总量反演研究

Retrieval of Antarctic Total Ozone Column From EMI

利用差分吸收光谱技术(DOAS)反演了我国首个星载大气痕量气体差分吸收光谱仪(EMI)的臭氧斜柱浓度(SCD),通过SCIATRAN辐射传输模型建立了大气质量因子(AMF)的查找表,最终得到EMI的臭氧垂直柱浓度(即臭氧柱总量)。将EMI、OMI和TROPOMI于2018年11月2日获得的南极区域臭氧柱总量进行了对比分析,三者均观测到南极中高纬度(30°S~70°S)的臭氧高值区域与南极内陆(75°S~90°S)的臭氧低值区域,且EMI与OMI、TROPOMI的臭氧柱总量相关性(R^(2))分别为0.977和0.979。进一步将EMI反演的臭氧柱总量与南极长城站(62.22 S,58.96 W)地基天顶散射光差分吸收光谱仪(ZSL-DOAS)反演的臭氧柱总量进行对比,二者相关性(R^(2))为0.926。

The slant column density(SCD)of ozone detected by Chinese first space-borne environmental trace gases monitoring instrument(EMI)was retrieved by using differential optical absorption spectroscopy(DOAS)method.Then the lookup table of atmospheric quality factor(AMF)was built based on SCIATRAN radiative transfer model,and the vertical column density of ozone(VCD,namely total ozone column)was finally obtained.A comparative analysis of the total ozone column from EMI,OMI and TROPOMI in the Antarctica on November 2,2018 shows that EMI,OMI and TROPOMI all observed the high ozone values area in mid and high latitude of Antarctica(30°S~70°S)and the low ozone values area in inland Antarctica(75°S~90°S),and the correlation coefficients(R^(2))between EMI and OMI,TROPOMI are 0.977 and 0.958 respectively.Furthermore,the total ozone columns of EMI was compared with that of ground-based ZSL-DOAS at Great Wall station(62.22 S,58.96 W)from October 25 to November 25,2018,and the correlation coefficient(R^(2))is 0.926.