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1、中国环境科学2005,25(4)：445~449ChinaEnvironmentalScience长江中下游浅水湖泊紫外辐射的衰减1,21*11134张运林,秦伯强,朱广伟,张路,罗潋葱,吴生才,王文敏(1.中国科学院南京地理与湖泊研究所,江苏南京210008；2.中国科学院研究生院,北京100039；3.盐城师范学院,江苏盐城224002；4.江西农业大学理学院,江西南昌330045)摘要：基于对长江中下游22个浅水湖泊有色可溶性有机物吸收的测量,运用经验模式估算了紫外辐射(UV-B、UV-A)在长江中下游湖泊的衰减及对应的穿透深度,并利用在武汉东湖实测的紫外辐射衰减进行了检验.结果表明,U
2、V-B波段的320nm和UV-A波段的380nm衰减系-1-1数变化范围分别为2.05~21.00m,1.07~12.85m,对应的1%穿透深度分别为0.22~2.25m,0.36~4.29m.估算得到的紫外辐射衰减系数与DOC浓度均存在显著性正相关,但UV-B波段要高于UV-A波段.武汉东湖实测的紫外辐射衰减检验发现,基于CDOM吸收系数估算UV-B辐射衰减较为精确,而由于浮游植物吸收和悬浮物散射等影响对UV-A波段估算精度则明显下降.关键词：长江中下游；浅水湖泊；紫外辐射；有色可溶性有机物；衰减系数中图分类号：X524文献标识码：A文章编号：1000-6923(2005)04-0445-0
3、5TheattenuationofultravioletradiationinshallowlakesinthemiddleandlowerreachesofYangtzeRiver.ZHANG1,21*11134Yun-lin,QINBo-qiang,ZHUGuang-wei,ZHANGLu,LUOLian-cong,WUSheng-cai,WANGWen-min(1.NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,China；2.GraduateSchoolofChineseAca
4、demyofSciences,Beijing100039,China；3.YanchengTeachersCollege,Yancheng224002,China；4.CollegeofScience,JiangxiAgriculturalUniversity,Nanchang330045,China).ChinaEnvironmentalScience,2005,25(4)：445~449Abstract：Basedonthemeasurementofchromophoricdissolvableorganicmatterin22shallowlakesinthemiddleandlower
5、reachesofYangtzeRiver,theattenuationofultravioletradiation(UV-B,UV-A)inthelakesinthemiddleandlowerreachesofYangtzeRiverandcorrespondingpenetratingdepthwereestimatedusingempiricalmodels;andcheckeduputilizingthefieldmeasuredattenuationofultravioletradiationinLakeDonghuWuhan.Thechangerangeof-1attenuati
6、oncoefficientsofUV-Bwaveband(320nm)andUV-Awaveband(380nm)was2.05~21.00mand-11.07~12.85mrespectively;andthecorresponding1%penetratingdepthswere0.22~2.25mand0.36~4.29mrespectively.TheestimatedultravioletradiationattenuationcoefficientandDOCconcentrationallexistedmarkedlypositiverelationship;butUV-Bwav
7、ebandwashigherthanUV-Awaveband.ThefieldcheckofultravioletradiationattenuationinLakeDonghu,WuhanshowedthattheestimationofattenuationofUV-BradiationwasmoreaccuratebasedonCDOMcoefficient;whiletheestimati
