Retrieval and Validation of Chlorophyll-a Concentrations in the Coastal Waters Off Yanam and Kakinada (Godavari) Basin Along East Coast of India

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• 作者：T. Preethi Latha (1)
  P. V. Nagamani (1)
  K. H. Rao (1)
  S. K. Dash (3)
  S. B. Choudhury (1)
  Aziz Rehman (2)
  V. V. S. S. Sarma (2)
  M. Naveen Babu (4)
  P. Amarendra (5)
  B. Srinivasa Rao (5)
  T. D. V. Prasad (1)
  
• 关键词：Chlorophyll ; Validation ; In ; situ ; HPLC
• 刊名：Journal of the Indian Society of Remote Sensing
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：42
• 期：1
• 页码：129-138
• 全文大小：618 KB
• 参考文献：1. Acharyya, T., Sarma, V. V. S. S., Sridevi, B., Venkataramana, V., Bharathi, M. D., Naidu, S. A., Kumar, B. S. K., Prasad, V. R., Bandopadhayay, D., Reddy, N. P. C., & Kumar, M. D. (2012). Reduced river discharge intensifies phytoplankton bloonm in Godavari estuary, India. / Marine Chemistry, 132-133, 15-2.
  2. O’Reilly, J. E., Maritonena, S., Mitchell, B. G., Siegal, D. A., Carder, K. L., Graver, S. A., Kahru, M., & McClain, C. R. (1998). Ocean color chlorophyll algorithms for SeaWiFS. / Journal of Geophysics, 103, 24937-4963. CrossRef
  3. Chauhan, P., Mohan, M., & Nayak, S. (2003). Comparative analysis of ocean colour measurements of IRS-P4 OCm and SeaWifsin the Arabian Sea- / Geoscience and Remote Sensing Letters, / 41, (4).
  4. Siegel, D.A., Wang, M., Maritorena, S., & Robinson, W (2000) Atmospheric correction of satellite ocean color imagery: the black pixel assumption. / Applied optics, 39(21).
  5. Gordon, H.R., & Wang, M. (1994) Retrieval of water-leaving radiance and aerosol optical thickness over thr oveans with seawifs: a preliminary algorithm. / Applied optics, 33(3).
  6. Prosoft 7.7 User manual; SAT-DN-00228 for Satlantic Hyperpro-II data processing and plotting software.
  7. Rao, K.N. et al., (2003). Coastal processes and forms of the Godavari delta.
  
• 作者单位：T. Preethi Latha (1)
  P. V. Nagamani (1)
  K. H. Rao (1)
  S. K. Dash (3)
  S. B. Choudhury (1)
  Aziz Rehman (2)
  V. V. S. S. Sarma (2)
  M. Naveen Babu (4)
  P. Amarendra (5)
  B. Srinivasa Rao (5)
  T. D. V. Prasad (1)
  
  1. National Remote Sensing Center, ISRO, Hyderabad, India
  3. Integrated Coastal and Marine Area Management, Chennai, India
  2. National Institute of Oceanography-RC, CSIR, Visakhapatnam, India
  4. Department of Zoology, Andhra University, Visakhapatnam, India
  5. Center for Studies on Bay of Bengal, Andhra University, Visakhapatnam, India
  
• ISSN：0974-3006

文摘

In this study chlorophyll measurements were made during March 2012 in the estuarine waters of Off Kakinada and Yanam coast, Bay of Bengal onboard a coastal vessel. In-situ water samples and optical data was collected at 21 stations (surface to 150?m depth) using Underwater radiometer (Hyperpro-II). In-vivo chlorophyll profiles were collected using wet labs fluorometer integrated with underwater Hyperspectral radiometer. Chlorophyll-a concentrations were estimated using HPLC by collecting the water samples at each sampling location. And also chlorophyll-a concentrations were retrieved from the OCM-2 data of OCEANSAT-2 satellite, processed using SeaDAS v.6.2 with the available global ocean colour algorithms namely, OC2 and OC4V4. A total of 33 samples used covering all the stations for chlorophyll-a estimation, and surface water samples of all the stations only being used for direct comparison among chlorophyll concentrations of HPLC, in-situ (fluorometrically integrated to Hyperpro-II) and retrieved from OCM-2. A good correlation found between the Fluorometer derived and HPLC measured chlorophyll-a concentration with an R2 value of 0.78. The relation between Chlorophyll-a concentration measured from HPLC and retrieved from OCM-2 (OC2 and OC4V4 algorithms) using SeaDASv.6.2 for 10 samples has been compared for validation and obtained an R2 value of 0.6. Also comparisons done with the in-situ measured (fluorometer) Chlorophyll-a concentration with OCM-2 chlorophyll data (OC4-V4 and OC2 algorithms) and validation with 10 concurrent in-situ surface measurements showed a significant overestimation by OCM-2 at low chlorophyll-a concentrations and underestimation at high chlorophyll-a concentrations.