Volcanic SO<sub>2</sub> retrieved from GF-5 Environmental trace gas Monitoring Instrument

نویسندگان

چکیده

火山喷发产生的高浓度SO2æ°”ä½“åŠå ¶è¿œè·ç¦»è¾“é€ä¼šå¯¹å ¨çƒæ°”å€™å˜åŒ–å’Œèˆªç©ºé£žè¡Œå®‰å ¨äº§ç”Ÿé‡è¦å½±å“ã€‚å«æ˜Ÿé¥æ„ŸæŠ€æœ¯ä»¥å¤§é¢ç§¯è¿žç»­è§‚æµ‹ã€é«˜æ—¶ç©ºåˆ†è¾¨çŽ‡ç­‰ä¼˜åŠ¿æˆä¸ºå¤§æ°”SO2ç›‘æµ‹çš„é‡è¦æ‰‹æ®µä¹‹ä¸€ã€‚ä½œä¸ºä¸­å›½ç¬¬ä¸€é¢—ç´«å¤–å¯è§å ‰æ³¢æ®µçš„é«˜å ‰è°±è½½è·ï¼Œé«˜åˆ†äº”å·å«æ˜Ÿå¤§æ°”ç—•é‡æ°”ä½“å·®åˆ†å¸æ”¶å ‰è°±ä»ªï¼ˆGF-5 EMI)通过探测地球大气或表面反射、散射的紫外辐射来解析SO2æ€»é‡çš„åˆ†å¸ƒå’Œå˜åŒ–ã€‚æœ¬æ–‡é¦–å ˆåŸºäºŽå¤§æ°”è¾å°„ä¼ è¾“æ¨¡åž‹SCIATRANï¼Œé€‰æ‹©ä¸­ä½Žçº¬åœ°åŒºåœ°è¡¨ç±»åž‹å‡ä¸€çš„æµ·æ´‹åŒºåŸŸåƒå ƒï¼Œæ¨¡æ‹Ÿäº†å ¸åž‹å¤§æ°”æ¡ä»¶ä¸‹çš„æ™´ç©ºå¤©é¡¶åç §çŽ‡ï¼Œç”¨ä»¥è¯„ä»·EMIè½½è·å¤©é¡¶è§‚æµ‹å ‰è°±çš„ç²¾åº¦ã€‚å ¶æ¬¡ï¼ŒåŸºäºŽTROPOMI L1 Radiance辐亮度数据和DOAS反演原理,经477 nm O4äº‘ç­›é€‰ã€å ‰è°±å®šæ ‡ã€æ ¢å˜å‰”é™¤ã€æ–œæŸ±è½¬åž‚ç›´æŸ±ç­‰æ­¥éª¤åŽï¼ŒèŽ·å¾—åŒä¸€ç«å±±å–·å‘åŒºåŸŸçš„SO2总量反演结果并与TROPOMI官方offline L2 SO2产品进行对比分析。最后,利用GF-5 EMI UV-2通道观测数据,采用DOAS算法反演获得GF-5 EMI大气SO2æ€»é‡ï¼Œå¹¶å°†åæ¼”ç»“æžœä¸Žå›½é™ åŒç±»è½½è·S5P/TROPOMI SO2总量结果进行比较分析,评判GF-5 EMIåœ¨å ¨çƒç«å±±æ´»åŠ¨SO2变化监测方面的能力。结果显示,300—400 nmæ³¢æ®µèŒƒå›´å† ï¼Œæµ·æ´‹åŒºåŸŸé‡‡æ ·ç‚¹EMIè§‚æµ‹å ‰è°±å€¼ä½ŽäºŽSCIATRANæ¨¡æ‹Ÿå ‰è°±å€¼ï¼ŒEMI与TROPOMIè§‚æµ‹å ‰è°±å‘ˆçŽ°å‡ºç›¸ä¼¼çš„ç³»ç»Ÿæ€§åå·®ã€‚åŸºäºŽé«˜ç©ºé—´é«˜å ‰è°±åˆ†è¾¨çŽ‡çš„TROPOMI Radiance辐亮度数据、315—327 nm、325—335 nm和360—390 nmå ±3个波段窗口、以及上述DOAS反演原理获得的SO2结果与TROPOMI官方发布的offline SO2äº§å“ç»“æžœç›¸å ³æ€§è¾ƒé«˜ï¼Œä¸¤è€ çš„ç›¸å ³ç³»æ•°å¯è¾¾åˆ°0.97—0.99,相对偏差在3%—9%。GF-5 EMI能够获取火山喷发SO2æŽ’æ”¾çš„æ—¶ç©ºåˆ†å¸ƒç‰¹å¾ï¼Œå¹¶ä¸Žå›½é™ åŒç±»è½½è·TROPOMIåæ¼”ç»“æžœå ·æœ‰è¾ƒé«˜çš„ç©ºé—´ä¸€è‡´æ€§ï¼Œèƒ½å¤Ÿæ»¡è¶³å ¨çƒç«å±±å–·å‘ç›‘æµ‹ã€é¢„è­¦åŠå ¶æ°”å€™å½±å“ç ”ç©¶çš„åº”ç”¨éœ€æ±‚ã€‚

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ژورنال

عنوان ژورنال: Journal of remote sensing

سال: 2021

ISSN: ['1007-4619', '2095-9494']

DOI: https://doi.org/10.11834/jrs.20211088