东印度洋南部海域遥感反射率光谱特征研究:不同观测方法及数据处理方法的对比
|
摘要
利用2016年秋季现场观测数据,开展了东印度洋南部海域水体遥感反射率光谱特征研究,分析了不同方法(剖面法、水面之上法)测量结果之间的差异,以及两种水面之上数据处理方法结果的差异。研究发现:(1)东印度洋南部海域的遥感反射率随波长单调下降,具备清洁大洋水体的典型光谱特征,在光谱形状和量值等方面均与研究区历史观测数据具有较好的一致性;(2)与剖面法得到的遥感反射率光谱相比,水面之上法的测量结果总体偏大,二者的相对偏差在离水辐射较强的蓝光波段(412~490 nm)为15%~25%,在离水辐射较弱的绿光波段(555 nm)为47%~61%;(3)不同的水面之上数据处理方法引起的遥感反射率相对偏差在蓝光波段是4%~7%,在绿光波段是11%。分析了不同测量方法、数据处理方法所得结果存在差异的原因。
The spectral characteristics of the remote-sensing reflectance Rrs(λ) in the eastern Indian Ocean were analyzed based on in-situ optical measurement in autumn 2016. The Rrs(λ) measured by the two methods were compared, including the profiling method and above-water method. The above-water Rrs(λ) derived from two different kinds of data processing procedures were also compared in this paper. The research finds that:(1) The Rrs(λ) in the eastern Indian Ocean decreases monotonically towards longer wave length, exhibiting typical characteristics of the open clean ocean water. Besides, good agreement was found between our measurements and historical measured data.(2) The Rrs(λ) derived from above-water method are generally higher than that by the profiling method, with the median absolute percentage difference(MAPD) of 15%~25%(47%~61%) in the blue band(green band).(3)The MAPD of the Rrs(λ) derived from two different kinds of above-water data processing procedures is 4%~7%(11%)in the blue band(green band). The mechanism of the observed difference is analyzed with different measuring methods and data processing methods.
The spectral characteristics of the remote-sensing reflectance Rrs(λ) in the eastern Indian Ocean were analyzed based on in-situ optical measurement in autumn 2016. The Rrs(λ) measured by the two methods were compared, including the profiling method and above-water method. The above-water Rrs(λ) derived from two different kinds of data processing procedures were also compared in this paper. The research finds that:(1) The Rrs(λ) in the eastern Indian Ocean decreases monotonically towards longer wave length, exhibiting typical characteristics of the open clean ocean water. Besides, good agreement was found between our measurements and historical measured data.(2) The Rrs(λ) derived from above-water method are generally higher than that by the profiling method, with the median absolute percentage difference(MAPD) of 15%~25%(47%~61%) in the blue band(green band).(3)The MAPD of the Rrs(λ) derived from two different kinds of above-water data processing procedures is 4%~7%(11%)in the blue band(green band). The mechanism of the observed difference is analyzed with different measuring methods and data processing methods.
引文
[1]Mueller J L,Fargion G S,Mcclain C R,et al.Ocean optics protocols for satellite ocean color sensor validation[J].British Journal of Surgery,2002,47(201):111-112.
[2]Fougnie B,Frouin R,Lecomte P,et al.Reduction of skylight reflection effects in the above-water measurement of diffuse marine reflectance[J].Applied Optics,1999,38(18):3844-3856.
[3]唐军武,田国良,汪小勇,等.水体光谱测量与分析Ⅰ:水面以上测量法[J].遥感学报,2004,8(1):37-44.
[4]彭京备.东印度洋海温对中国南方冬季降水的影响[J].气候与环境研究,2012,17(3):327-338.
[5]高艺,郑益群,邓飞,等.东南印度洋海温变化对我国东部夏季降水的影响[J].海洋预报,2010,27(1):15-20.
[6]赵永平,吴爱明.南海—热带东印度洋海温异常对南海夏季风影响的数值试验[J].热带气象学报,2003,19(1):27-35.
[7]刘毓赟.热带太平洋和印度洋海表温度异常对东亚冬季风影响的物理机制研究[D].昆明:云南大学,2009.
[8]乔彬,刘子洲,张书颖,等.季风转换期东印度洋的赤道流系结构和水文特征[J].海洋科学进展,2014,32(3):301-305.
[9]宣莉莉.热带东印度洋上层海洋环流及其与孟加拉湾水交换的季节变化研究[D].厦门:国家海洋局第三海洋研究所,2013.
[10]Mobley C D.Estimation of the remote-sensing reflectance from above-surface measurements[J].Applied Optics,1999,38(36):7442-55.
[11]Lee Z,Ahn Y H,Mobley C,et al.Removal of surface-reflected light for the measurement of remote-sensing reflectance from an above-surface platform[J].Optics Express,2010,18(25):26313-24.
[12]Morel A,Maritorena S.Bio‐optical properties of oceanic waters:A reappraisal[J].Journal of Geophysical Research,2001,106(106):7163-7180.
[13]中华人民共和国国家质量监督检验检疫总局,中国国家标准化委员会.GB/T 12763.5—2007.海洋调查规范[S].中国标准出版社,2007.
[14]梁顺林,陈丙咸.可见光遥感的水面辐射传输模型研究[J].海洋学研究,1986(3):58-66.
[15]隋晓飞,商少平,马晓鑫,等.剖面法与水面之上法测量水面下遥感反射率的比较[J].厦门大学学报:自然科学版,2007,46(s1):6-11.
[16]Garaba S P,Zielinski O.Comparison of remote sensing reflectance from above-water and in-water measurements west of Greenland,Labrador Sea,Denmark Strait,and west of Iceland[J].Optics Express,2013,21(13):15938-50.
[17]Hooker S B,Lazin G,Zibordi G,et al.An evaluation of above-and in-water methods for determining water-leaving radiances[J].Journal of Atmospheric&Oceanic Technology,2002,19(4):486-515.
[18]S B Hooker,G Zibordi,J-F Berthon,et al.Above-water radiometry in shallow coastal waters[J].Applied Optics,2004,43(21):4254-4268.
[19]Zibordi G,Hooker S B,Berthon J F,et al.Autonomous above-water radiance measurements from an offshore platform:a field assessment experiment[J].J atmos oceanic Technol,2002,19(5):808-819.
[20]Zibordi G,Melin F,Hooker S B,et al.An autonomous above-water system for the validation of ocean color radiance data[J].IEEE Transactions on Geoscience&Remote Sensing,2004,42(2):401-415.
[21]Zibordi G,Ruddick K,Ansko I,et al.In situ determination of the remote sensing reflectance:an inter-comparison[J].Ocean Science,2012,8(4):567-586.
[2]Fougnie B,Frouin R,Lecomte P,et al.Reduction of skylight reflection effects in the above-water measurement of diffuse marine reflectance[J].Applied Optics,1999,38(18):3844-3856.
[3]唐军武,田国良,汪小勇,等.水体光谱测量与分析Ⅰ:水面以上测量法[J].遥感学报,2004,8(1):37-44.
[4]彭京备.东印度洋海温对中国南方冬季降水的影响[J].气候与环境研究,2012,17(3):327-338.
[5]高艺,郑益群,邓飞,等.东南印度洋海温变化对我国东部夏季降水的影响[J].海洋预报,2010,27(1):15-20.
[6]赵永平,吴爱明.南海—热带东印度洋海温异常对南海夏季风影响的数值试验[J].热带气象学报,2003,19(1):27-35.
[7]刘毓赟.热带太平洋和印度洋海表温度异常对东亚冬季风影响的物理机制研究[D].昆明:云南大学,2009.
[8]乔彬,刘子洲,张书颖,等.季风转换期东印度洋的赤道流系结构和水文特征[J].海洋科学进展,2014,32(3):301-305.
[9]宣莉莉.热带东印度洋上层海洋环流及其与孟加拉湾水交换的季节变化研究[D].厦门:国家海洋局第三海洋研究所,2013.
[10]Mobley C D.Estimation of the remote-sensing reflectance from above-surface measurements[J].Applied Optics,1999,38(36):7442-55.
[11]Lee Z,Ahn Y H,Mobley C,et al.Removal of surface-reflected light for the measurement of remote-sensing reflectance from an above-surface platform[J].Optics Express,2010,18(25):26313-24.
[12]Morel A,Maritorena S.Bio‐optical properties of oceanic waters:A reappraisal[J].Journal of Geophysical Research,2001,106(106):7163-7180.
[13]中华人民共和国国家质量监督检验检疫总局,中国国家标准化委员会.GB/T 12763.5—2007.海洋调查规范[S].中国标准出版社,2007.
[14]梁顺林,陈丙咸.可见光遥感的水面辐射传输模型研究[J].海洋学研究,1986(3):58-66.
[15]隋晓飞,商少平,马晓鑫,等.剖面法与水面之上法测量水面下遥感反射率的比较[J].厦门大学学报:自然科学版,2007,46(s1):6-11.
[16]Garaba S P,Zielinski O.Comparison of remote sensing reflectance from above-water and in-water measurements west of Greenland,Labrador Sea,Denmark Strait,and west of Iceland[J].Optics Express,2013,21(13):15938-50.
[17]Hooker S B,Lazin G,Zibordi G,et al.An evaluation of above-and in-water methods for determining water-leaving radiances[J].Journal of Atmospheric&Oceanic Technology,2002,19(4):486-515.
[18]S B Hooker,G Zibordi,J-F Berthon,et al.Above-water radiometry in shallow coastal waters[J].Applied Optics,2004,43(21):4254-4268.
[19]Zibordi G,Hooker S B,Berthon J F,et al.Autonomous above-water radiance measurements from an offshore platform:a field assessment experiment[J].J atmos oceanic Technol,2002,19(5):808-819.
[20]Zibordi G,Melin F,Hooker S B,et al.An autonomous above-water system for the validation of ocean color radiance data[J].IEEE Transactions on Geoscience&Remote Sensing,2004,42(2):401-415.
[21]Zibordi G,Ruddick K,Ansko I,et al.In situ determination of the remote sensing reflectance:an inter-comparison[J].Ocean Science,2012,8(4):567-586.