Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea
The data of the sea reflectance coefficient were obtained during the cruise of the R/V “Akademik Ioffe” (10 August–8 September 2021) in the Kara Sea beyond the Arctic Circle. A total of 28 measurements of sea reflectance were performed in different conditions ranging from estuarine zones to open oce...
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ftmdpi:oai:mdpi.com:/2077-1312/10/11/1587/ 2023-08-20T04:04:50+02:00 Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea Elena Korchemkina Dmitriy Deryagin Mariia Pavlova Anna Kostyleva Igor E. Kozlov Svetlana Vazyulya agris 2022-10-27 application/pdf https://doi.org/10.3390/jmse10111587 EN eng Multidisciplinary Digital Publishing Institute Physical Oceanography https://dx.doi.org/10.3390/jmse10111587 https://creativecommons.org/licenses/by/4.0/ Journal of Marine Science and Engineering; Volume 10; Issue 11; Pages: 1587 remote sensed reflectance OC4 GIOP OLCI MODIS VIIRS polar region semi-analytical algorithm MHI empirical algorithm K17 Text 2022 ftmdpi https://doi.org/10.3390/jmse10111587 2023-08-01T07:04:11Z The data of the sea reflectance coefficient were obtained during the cruise of the R/V “Akademik Ioffe” (10 August–8 September 2021) in the Kara Sea beyond the Arctic Circle. A total of 28 measurements of sea reflectance were performed in different conditions ranging from estuarine zones to open ocean. In addition, at 10 stations, water samples were taken, and chlorophyll-a concentrations were determined using the fluorometric method. In situ reflectance data were compared to satellite data (MODIS Aqua/Terra, Sentinel OLCI 3A/B, VIIRS SNPP) obtained within 24 h before and after the measurement. It was shown that, in general, an overestimation of remote sensing reflectance is observed in short-wave channels (412, 443, 469 nm for MODIS; 410, 412.5, 442.5 for OLCI) and underestimation in long-wave channels (708.75, 753.75 nm for OLCI). The obtained in situ chlorophyll-a concentrations were compared with the results of standard models (GIOP, OC2, OC3, OC4), and regional algorithms (semi-analytical MHI, empirical K17) were applied to the in situ and remotely sensed reflectances. In the cases of GIOP and OC4, unrealistic concentrations of chlorophyll-a were obtained. Regional algorithms developed earlier, specifically for the Kara Sea, showed good correlation (0.6 and 0.76) with in situ measurements. Despite the approximately 20% overestimation of chlorophyll-a by both regional algorithms, they can be used to obtain chlorophyll-a concentrations in the Kara Sea in a concentration range of <1 mg/m3. Text Arctic Kara Sea MDPI Open Access Publishing Arctic Kara Sea Journal of Marine Science and Engineering 10 11 1587 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
remote sensed reflectance OC4 GIOP OLCI MODIS VIIRS polar region semi-analytical algorithm MHI empirical algorithm K17 |
spellingShingle |
remote sensed reflectance OC4 GIOP OLCI MODIS VIIRS polar region semi-analytical algorithm MHI empirical algorithm K17 Elena Korchemkina Dmitriy Deryagin Mariia Pavlova Anna Kostyleva Igor E. Kozlov Svetlana Vazyulya Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea |
topic_facet |
remote sensed reflectance OC4 GIOP OLCI MODIS VIIRS polar region semi-analytical algorithm MHI empirical algorithm K17 |
description |
The data of the sea reflectance coefficient were obtained during the cruise of the R/V “Akademik Ioffe” (10 August–8 September 2021) in the Kara Sea beyond the Arctic Circle. A total of 28 measurements of sea reflectance were performed in different conditions ranging from estuarine zones to open ocean. In addition, at 10 stations, water samples were taken, and chlorophyll-a concentrations were determined using the fluorometric method. In situ reflectance data were compared to satellite data (MODIS Aqua/Terra, Sentinel OLCI 3A/B, VIIRS SNPP) obtained within 24 h before and after the measurement. It was shown that, in general, an overestimation of remote sensing reflectance is observed in short-wave channels (412, 443, 469 nm for MODIS; 410, 412.5, 442.5 for OLCI) and underestimation in long-wave channels (708.75, 753.75 nm for OLCI). The obtained in situ chlorophyll-a concentrations were compared with the results of standard models (GIOP, OC2, OC3, OC4), and regional algorithms (semi-analytical MHI, empirical K17) were applied to the in situ and remotely sensed reflectances. In the cases of GIOP and OC4, unrealistic concentrations of chlorophyll-a were obtained. Regional algorithms developed earlier, specifically for the Kara Sea, showed good correlation (0.6 and 0.76) with in situ measurements. Despite the approximately 20% overestimation of chlorophyll-a by both regional algorithms, they can be used to obtain chlorophyll-a concentrations in the Kara Sea in a concentration range of <1 mg/m3. |
format |
Text |
author |
Elena Korchemkina Dmitriy Deryagin Mariia Pavlova Anna Kostyleva Igor E. Kozlov Svetlana Vazyulya |
author_facet |
Elena Korchemkina Dmitriy Deryagin Mariia Pavlova Anna Kostyleva Igor E. Kozlov Svetlana Vazyulya |
author_sort |
Elena Korchemkina |
title |
Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea |
title_short |
Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea |
title_full |
Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea |
title_fullStr |
Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea |
title_full_unstemmed |
Advantage of Regional Algorithms for the Chlorophyll-a Concentration Retrieval from In Situ Optical Measurements in the Kara Sea |
title_sort |
advantage of regional algorithms for the chlorophyll-a concentration retrieval from in situ optical measurements in the kara sea |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/jmse10111587 |
op_coverage |
agris |
geographic |
Arctic Kara Sea |
geographic_facet |
Arctic Kara Sea |
genre |
Arctic Kara Sea |
genre_facet |
Arctic Kara Sea |
op_source |
Journal of Marine Science and Engineering; Volume 10; Issue 11; Pages: 1587 |
op_relation |
Physical Oceanography https://dx.doi.org/10.3390/jmse10111587 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/jmse10111587 |
container_title |
Journal of Marine Science and Engineering |
container_volume |
10 |
container_issue |
11 |
container_start_page |
1587 |
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1774715230817878016 |