предыдущий|следующий

Preliminary performance of the COCTS onboard HY-1D satellite in the global ocean

  • role： First author第一作者
  • Affiliation：

    College of Marine Technology, Ocean University of China, Qingdao 266100, China

  • Email：shixinhao@stu.ouc.edu.cn
  • Introduction：史鑫皓，研究方向为海洋光学与水色遥感。E-mail： shixinhao@stu.ouc.edu.cn
SHI Xinhao1,  
  • role： Corresponding author通信作者
  • Affiliation：

    College of Marine Technology, Ocean University of China, Qingdao 266100, China

    Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China

    Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China

    National Satellite Ocean Application Service, Beijing 100081, China

  • Email：chenshuguo@ouc.edu.cn
  • Introduction：陈树果，研究方向为海洋光学与水色遥感。E-mail：chenshuguo@ouc.edu.cn
CHEN Shuguo1234*,  
  • Affiliation：

    National Satellite Ocean Application Service, Beijing 100081, China

LIN Mingsen4,  
  • Affiliation：

    National Satellite Ocean Application Service, Beijing 100081, China

LIU Jianqiang4,  
  • Affiliation：

    National Satellite Ocean Application Service, Beijing 100081, China

MA Chaofei4,  
  • Affiliation：

    National Satellite Ocean Application Service, Beijing 100081, China

SONG Qingjun4,  
  • Affiliation：

    College of Marine Technology, Ocean University of China, Qingdao 266100, China

XUE Cheng1,  
  • Affiliation：

    College of Marine Technology, Ocean University of China, Qingdao 266100, China

    Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China

HU Lianbo12

реферат

The Chinese Ocean Color and Temperature Scanner (COCTS) onboard HY-1D satellite (COCTS HY-1D) was launched on June 11, 2020. However, the performance of COCTS HY-1D has not yet been completely evaluated. In this study, the performance of COCTS HY-1D was first evaluated by comparing satellite derived remote sensing reflectance (Rrs) with in situ measurements collected at four AERONET-OC sites and two Chinese long-term platforms.Initially, the in situ data at four AERONET-OC sites were acquired to evaluate the performance of COCTS HY-1D in the global coastal waters. AERONET-OC is an ocean color component of the AERONET and provides long-term high-quality in situ normalized water leaving radiance (Lwn) measured by an autonomous radiometer system on an offshore fixed platform to support the calibration and validation of satellite ocean color sensors in coastal waters. Muping and Dong’ou sites were constructed by the China National Satellite Ocean Administration Service (NSOAS), and the data were processed following the same procedure as that of the AERONET-OC data processing scheme. The COCTS HY-1D Level 1B data covering AERONET-OC sites and two long-term platforms between 1 August 1 2020 and 31 January 31 2021 in cloud-free days were acquired from NSOAS and processed to Level 2 Rrs and Chl-a concentration products. Furthermore, Rrs and Chl-a concentration comparison with two well-calibrated ocean color sensors (i.e., MODIS Aqua and VIIRS-SNPP) were made to evaluate the performance of COCTS HY-1D on the global scale. Additionally, the COCTS HY-1D Level 1B daily global dataset between December 7 and 14, 2020 were also required from NSOAS, processed to Level 2, and binned to Level 3 daily and 8-day 9-km data products by using the spatial-temporal binning algorithms developed by NASA. MODIS Aqua and VIIRS-SNPP Level 3 global binned daily and 8-day 9-km Rrs and Chl-a concentration data collected between December 7 and 14, 2020 were acquired from NASA GSFC. The statistics used in this study included correlation coefficient (r), Root Mean Square Error (RMSE), Mean Absolute Percentage Error (MAPE), and mean bias (mBias).Results demonstrated that COCTS HY-1D-derived Rrs agreed well with the in situ data at all wavelengths with the correlation coefficient r of visible bands between 0.91 and 0.98 and up to 0.98 and Mean Absolute Percentage Error (MAPE) of 22.9%. The product’s accuracy is comparable to the average MAPE of 20.5% between MODIS Aqua and in situ data. At the global scale, the COCTS HY-1D-derived Rrs and chlorophyll concentration were consistent with MODIS Aqua products with a mean correlation coefficient ranging from 0.84 and to 0.95. The correlation coefficient of Chl-a is 0.85,which is higher than 0.76 between MODIS Aqua and VIIRS-SNPP. Nevertheless, the satisfactory Rrs was derived from COCTS HY-1D at the global scale compared with the in situ measurements or well-calibrated MODIS Aqua and VIIRS-SNPP products.COCTS HY-1D can provide high quality ocean color products comparable with the international mainstream ocean color satellite sensors, and therefore can carry out stable and accurate ocean color remote sensing observation.

ключеви́че слова́

in situ observation;ocean color;HY-1D;COCTS;remote sensing refcectance

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