The research on sea ice resources is the academic base of sea ice exploitation in the Bohai Sea. According to the ice-water spectrum differences and the correlation between ice thickness and albedo, this paper comes u...The research on sea ice resources is the academic base of sea ice exploitation in the Bohai Sea. According to the ice-water spectrum differences and the correlation between ice thickness and albedo, this paper comes up with a sea ice thickness inversion model based on the NOAA/AVHRR data. And then a sea ice resources quantity （SIQ） time series of Bohai Sea is established from 1987 to 2009. The results indicate that the average error of inversion sea ice thickness is below 30%. The maximum sea ice resources quantity is about 6×109 m3 and the minimum is 1.3×109 m3. And a preliminary analysis has been made on the errors of the estimate of sea ice resources quantity （SIQ）.展开更多
Based on the atmospheric horizontal visibility data from forty-seven observational stations along the eastern coast of China near the Taiwan Strait and simultaneous NOAA/AVHRR multichannel satellite data during Januar...Based on the atmospheric horizontal visibility data from forty-seven observational stations along the eastern coast of China near the Taiwan Strait and simultaneous NOAA/AVHRR multichannel satellite data during January 2001 to December 2002, the spectral characters associated with visibility were investigated. Successful retrieval of visibility from multichannel NOAA/AVHRR data was performed using the principal component regression （PCR） method. A sample of retrieved visibility distribution was discussed with a sea fog process. The correlation coefficient between the observed and retrieved visibility was about 0.82, which is far higher than the 99.9% confidence level by statistical test. The rate of successful retrieval is 94.98% of the 458 cases during 2001 2002. The error distribution showed that high visibilities were usually under-estimated and low visibilities were over-estimated and the relative error between the observed and retrieved visibilities was about 21.4%.展开更多
NOAA global operational NOAA/AVHRR Nonlinear Sea Surface Temperature (NLSST) retrieval algorithms were used to generate Global Area Coverage (GAC) sea surface temperature (SST) measurements in the global ocean in 1998...NOAA global operational NOAA/AVHRR Nonlinear Sea Surface Temperature (NLSST) retrieval algorithms were used to generate Global Area Coverage (GAC) sea surface temperature (SST) measurements in the global ocean in 1998. The accuracy of SST retrieved from daytime split window NLSST algorithm and nighttime triple window NLSST algorithm for NOAA 14 AVHRR data was investigated in this study. A matchup dataset of drifting buoys and NOAA 14 satellite measurements in the global ocean was generated to validate these operational split window and triple window algorithms. For NOAA 14 in 1998, we had 14095 and 22643 satellite and buoy matchups that matched within 25 km and 4 hours for daytime and nighttime, respectively. The satellite derived SST had a bias of less than 0.1℃ and standard deviation of about 0.5℃. This study also showed that the NLSST algorithm provided the same order of SST accuracy in different time of the year and under a wide range of satellite zenith angle and water vapor represented by the channel 4 and 5 brightness temperature difference. Therefore, NLSST algorithms are usually independent of season, geographic location, or atmospheric moisture content. Comparison between the low resolution AVHRR GAC data accuracy and high resolution Local Area Coverage (LAC) data accuracy is also discussed.展开更多
蒸散量是水资源相互转化过程中非常重要但又难以定量确定的要素之一。SEBS(Surface Energy Balance System)模型是通过遥感数据计算区域蒸散量的重要模型,该模型可以在较少地面信息的情况下获得蒸散量的区域分布信息,同时具有较高的精...蒸散量是水资源相互转化过程中非常重要但又难以定量确定的要素之一。SEBS(Surface Energy Balance System)模型是通过遥感数据计算区域蒸散量的重要模型,该模型可以在较少地面信息的情况下获得蒸散量的区域分布信息,同时具有较高的精度。采用SEBS模型,利用NOAA/AVHRR数据对我国重要的商品粮基地三江平原区域蒸散发量进行了研究,并通过实测数据对估算结果进行了验证。结果表明:从时间分布来看,三江平原蒸散量总体上表现为从4月开始逐渐上升,7月达到最高值,8月后不断下降。在此基础上,探讨了三江平原蒸散量时间分布的原因。同时,结合研究区的土地利用类型,对三江平原区域蒸散量空间分布进行了分析,各种土地利用类型生长季平均蒸散量从大到小可以排列为:林地>水域>湿地>水田>旱田>草地>居工地。展开更多
基金State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University of China under contract No.2009-KF-08the Key Project of the National Natural Science Foundation of China under contract No.ID:40335048+1 种基金the National Science and Technology Plans to Support Major Projects Subject under contract No.ID: 2006BAB03A03the National ‘863’ Key Project of China under contract No.ID: 2006AA100206
文摘The research on sea ice resources is the academic base of sea ice exploitation in the Bohai Sea. According to the ice-water spectrum differences and the correlation between ice thickness and albedo, this paper comes up with a sea ice thickness inversion model based on the NOAA/AVHRR data. And then a sea ice resources quantity （SIQ） time series of Bohai Sea is established from 1987 to 2009. The results indicate that the average error of inversion sea ice thickness is below 30%. The maximum sea ice resources quantity is about 6×109 m3 and the minimum is 1.3×109 m3. And a preliminary analysis has been made on the errors of the estimate of sea ice resources quantity （SIQ）.
基金This research is supported by the National High Technology Development Project （863） of China （Grant No. 2002AA639500） the Natural Science Foundation of Guangdong Province （Grant No. 032212）+1 种基金 National Basic Research Program of China （973 Program） （No. 2005CB422301） Program for New Century Excellent Talents in University （ NCET-05-0591 ）.
文摘Based on the atmospheric horizontal visibility data from forty-seven observational stations along the eastern coast of China near the Taiwan Strait and simultaneous NOAA/AVHRR multichannel satellite data during January 2001 to December 2002, the spectral characters associated with visibility were investigated. Successful retrieval of visibility from multichannel NOAA/AVHRR data was performed using the principal component regression （PCR） method. A sample of retrieved visibility distribution was discussed with a sea fog process. The correlation coefficient between the observed and retrieved visibility was about 0.82, which is far higher than the 99.9% confidence level by statistical test. The rate of successful retrieval is 94.98% of the 458 cases during 2001 2002. The error distribution showed that high visibilities were usually under-estimated and low visibilities were over-estimated and the relative error between the observed and retrieved visibilities was about 21.4%.
文摘NOAA global operational NOAA/AVHRR Nonlinear Sea Surface Temperature (NLSST) retrieval algorithms were used to generate Global Area Coverage (GAC) sea surface temperature (SST) measurements in the global ocean in 1998. The accuracy of SST retrieved from daytime split window NLSST algorithm and nighttime triple window NLSST algorithm for NOAA 14 AVHRR data was investigated in this study. A matchup dataset of drifting buoys and NOAA 14 satellite measurements in the global ocean was generated to validate these operational split window and triple window algorithms. For NOAA 14 in 1998, we had 14095 and 22643 satellite and buoy matchups that matched within 25 km and 4 hours for daytime and nighttime, respectively. The satellite derived SST had a bias of less than 0.1℃ and standard deviation of about 0.5℃. This study also showed that the NLSST algorithm provided the same order of SST accuracy in different time of the year and under a wide range of satellite zenith angle and water vapor represented by the channel 4 and 5 brightness temperature difference. Therefore, NLSST algorithms are usually independent of season, geographic location, or atmospheric moisture content. Comparison between the low resolution AVHRR GAC data accuracy and high resolution Local Area Coverage (LAC) data accuracy is also discussed.
文摘蒸散量是水资源相互转化过程中非常重要但又难以定量确定的要素之一。SEBS(Surface Energy Balance System)模型是通过遥感数据计算区域蒸散量的重要模型,该模型可以在较少地面信息的情况下获得蒸散量的区域分布信息,同时具有较高的精度。采用SEBS模型,利用NOAA/AVHRR数据对我国重要的商品粮基地三江平原区域蒸散发量进行了研究,并通过实测数据对估算结果进行了验证。结果表明:从时间分布来看,三江平原蒸散量总体上表现为从4月开始逐渐上升,7月达到最高值,8月后不断下降。在此基础上,探讨了三江平原蒸散量时间分布的原因。同时,结合研究区的土地利用类型,对三江平原区域蒸散量空间分布进行了分析,各种土地利用类型生长季平均蒸散量从大到小可以排列为:林地>水域>湿地>水田>旱田>草地>居工地。
