{"id":"https://openalex.org/W3107782401","doi":"https://doi.org/10.3390/s20236881","title":"Assessing the Trend of the Trophic State of Lake Ladoga Based on Multi-Year (1997\u20132019) CMEMS GlobColour-Merged CHL-OC5 Satellite Observations","display_name":"Assessing the Trend of the Trophic State of Lake Ladoga Based on Multi-Year (1997\u20132019) CMEMS GlobColour-Merged CHL-OC5 Satellite Observations","publication_year":2020,"publication_date":"2020-12-01","ids":{"openalex":"https://openalex.org/W3107782401","doi":"https://doi.org/10.3390/s20236881","mag":"3107782401","pmid":"https://pubmed.ncbi.nlm.nih.gov/33271976"},"language":"en","primary_location":{"id":"doi:10.3390/s20236881","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s20236881","pdf_url":"https://www.mdpi.com/1424-8220/20/23/6881/pdf?version=1606834057","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj","pubmed"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://www.mdpi.com/1424-8220/20/23/6881/pdf?version=1606834057","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5060050645","display_name":"Augustine-Moses Gaavwase Gbagir","orcid":"https://orcid.org/0000-0003-3322-6631"},"institutions":[{"id":"https://openalex.org/I175532246","display_name":"University of Eastern Finland","ror":"https://ror.org/00cyydd11","country_code":"FI","type":"education","lineage":["https://openalex.org/I175532246"]},{"id":"https://openalex.org/I4210102514","display_name":"Borealis (Finland)","ror":"https://ror.org/019qdfq91","country_code":"FI","type":"company","lineage":["https://openalex.org/I4210102514","https://openalex.org/I4210162562"]}],"countries":["FI"],"is_corresponding":true,"raw_author_name":"Augustine-Moses Gaavwase Gbagir","raw_affiliation_strings":["School of Forest Sciences, University of Eastern Finland, Yliopistokatu 7, Borealis Building A 3rd Floor, 80101 Joensuu, Finland"],"raw_orcid":"https://orcid.org/0000-0003-3322-6631","affiliations":[{"raw_affiliation_string":"School of Forest Sciences, University of Eastern Finland, Yliopistokatu 7, Borealis Building A 3rd Floor, 80101 Joensuu, Finland","institution_ids":["https://openalex.org/I175532246","https://openalex.org/I4210102514"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5000165129","display_name":"Alfred Colpaert","orcid":"https://orcid.org/0000-0001-5833-7309"},"institutions":[{"id":"https://openalex.org/I175532246","display_name":"University of Eastern Finland","ror":"https://ror.org/00cyydd11","country_code":"FI","type":"education","lineage":["https://openalex.org/I175532246"]}],"countries":["FI"],"is_corresponding":false,"raw_author_name":"Alfred Colpaert","raw_affiliation_strings":["Department of Geographical and Historical Studies, University of Eastern Finland, Yliopistokatu 7, Metria-Building, P.O. Box 111, FI-80101 Joensuu, Finland"],"raw_orcid":"https://orcid.org/0000-0001-5833-7309","affiliations":[{"raw_affiliation_string":"Department of Geographical and Historical Studies, University of Eastern Finland, Yliopistokatu 7, Metria-Building, P.O. Box 111, FI-80101 Joensuu, Finland","institution_ids":["https://openalex.org/I175532246"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5060050645"],"corresponding_institution_ids":["https://openalex.org/I175532246","https://openalex.org/I4210102514"],"apc_list":{"value":2400,"currency":"CHF","value_usd":2598},"apc_paid":{"value":2400,"currency":"CHF","value_usd":2598},"fwci":1.4456,"has_fulltext":true,"cited_by_count":14,"citation_normalized_percentile":{"value":0.81548678,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":98},"biblio":{"volume":"20","issue":"23","first_page":"6881","last_page":"6881"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12073","display_name":"Isotope Analysis in Ecology","score":0.9912999868392944,"subfield":{"id":"https://openalex.org/subfields/2303","display_name":"Ecology"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T12073","display_name":"Isotope Analysis in Ecology","score":0.9912999868392944,"subfield":{"id":"https://openalex.org/subfields/2303","display_name":"Ecology"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10398","display_name":"Groundwater and Isotope Geochemistry","score":0.987500011920929,"subfield":{"id":"https://openalex.org/subfields/1906","display_name":"Geochemistry and Petrology"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10032","display_name":"Marine and coastal ecosystems","score":0.9861000180244446,"subfield":{"id":"https://openalex.org/subfields/1910","display_name":"Oceanography"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/trophic-level","display_name":"Trophic level","score":0.7738158106803894},{"id":"https://openalex.org/keywords/environmental-science","display_name":"Environmental science","score":0.6716962456703186},{"id":"https://openalex.org/keywords/eutrophication","display_name":"Eutrophication","score":0.6437491178512573},{"id":"https://openalex.org/keywords/shore","display_name":"Shore","score":0.6076815724372864},{"id":"https://openalex.org/keywords/water-quality","display_name":"Water quality","score":0.5593960285186768},{"id":"https://openalex.org/keywords/trophic-state-index","display_name":"Trophic state index","score":0.5066922307014465},{"id":"https://openalex.org/keywords/phytoplankton","display_name":"Phytoplankton","score":0.4879438281059265},{"id":"https://openalex.org/keywords/current","display_name":"Current (fluid)","score":0.4833764433860779},{"id":"https://openalex.org/keywords/ecology","display_name":"Ecology","score":0.40539219975471497},{"id":"https://openalex.org/keywords/hydrology","display_name":"Hydrology (agriculture)","score":0.39097851514816284},{"id":"https://openalex.org/keywords/nutrient","display_name":"Nutrient","score":0.3898654580116272},{"id":"https://openalex.org/keywords/physical-geography","display_name":"Physical geography","score":0.33148717880249023},{"id":"https://openalex.org/keywords/oceanography","display_name":"Oceanography","score":0.30314141511917114},{"id":"https://openalex.org/keywords/geography","display_name":"Geography","score":0.24349769949913025},{"id":"https://openalex.org/keywords/biology","display_name":"Biology","score":0.1138608455657959},{"id":"https://openalex.org/keywords/geology","display_name":"Geology","score":0.09344279766082764}],"concepts":[{"id":"https://openalex.org/C72958200","wikidata":"https://www.wikidata.org/wiki/Q1053008","display_name":"Trophic level","level":2,"score":0.7738158106803894},{"id":"https://openalex.org/C39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","level":0,"score":0.6716962456703186},{"id":"https://openalex.org/C186699998","wikidata":"https://www.wikidata.org/wiki/Q156698","display_name":"Eutrophication","level":3,"score":0.6437491178512573},{"id":"https://openalex.org/C152382732","wikidata":"https://www.wikidata.org/wiki/Q468756","display_name":"Shore","level":2,"score":0.6076815724372864},{"id":"https://openalex.org/C2780797713","wikidata":"https://www.wikidata.org/wiki/Q625376","display_name":"Water quality","level":2,"score":0.5593960285186768},{"id":"https://openalex.org/C152913119","wikidata":"https://www.wikidata.org/wiki/Q30599066","display_name":"Trophic state index","level":4,"score":0.5066922307014465},{"id":"https://openalex.org/C2780892065","wikidata":"https://www.wikidata.org/wiki/Q184755","display_name":"Phytoplankton","level":3,"score":0.4879438281059265},{"id":"https://openalex.org/C148043351","wikidata":"https://www.wikidata.org/wiki/Q4456944","display_name":"Current (fluid)","level":2,"score":0.4833764433860779},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.40539219975471497},{"id":"https://openalex.org/C76886044","wikidata":"https://www.wikidata.org/wiki/Q2883300","display_name":"Hydrology (agriculture)","level":2,"score":0.39097851514816284},{"id":"https://openalex.org/C142796444","wikidata":"https://www.wikidata.org/wiki/Q181394","display_name":"Nutrient","level":2,"score":0.3898654580116272},{"id":"https://openalex.org/C100970517","wikidata":"https://www.wikidata.org/wiki/Q52107","display_name":"Physical geography","level":1,"score":0.33148717880249023},{"id":"https://openalex.org/C111368507","wikidata":"https://www.wikidata.org/wiki/Q43518","display_name":"Oceanography","level":1,"score":0.30314141511917114},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.24349769949913025},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.1138608455657959},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.09344279766082764},{"id":"https://openalex.org/C187320778","wikidata":"https://www.wikidata.org/wiki/Q1349130","display_name":"Geotechnical engineering","level":1,"score":0.0}],"mesh":[],"locations_count":5,"locations":[{"id":"doi:10.3390/s20236881","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s20236881","pdf_url":"https://www.mdpi.com/1424-8220/20/23/6881/pdf?version=1606834057","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},{"id":"pmid:33271976","is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/33271976","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors (Basel, Switzerland)","raw_type":null},{"id":"pmh:oai:doaj.org/article:544649f8d04d4c2e850b7866f374ec51","is_oa":true,"landing_page_url":"https://doaj.org/article/544649f8d04d4c2e850b7866f374ec51","pdf_url":null,"source":{"id":"https://openalex.org/S4306401280","display_name":"DOAJ (DOAJ: Directory of Open Access Journals)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by-sa","license_id":"https://openalex.org/licenses/cc-by-sa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors, Vol 20, Iss 23, p 6881 (2020)","raw_type":"article"},{"id":"pmh:oai:mdpi.com:/1424-8220/20/23/6881/","is_oa":true,"landing_page_url":"https://dx.doi.org/10.3390/s20236881","pdf_url":null,"source":{"id":"https://openalex.org/S4306400947","display_name":"MDPI (MDPI AG)","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210097602","host_organization_name":"Multidisciplinary Digital Publishing Institute (Switzerland)","host_organization_lineage":["https://openalex.org/I4210097602"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors; Volume 20; Issue 23; Pages: 6881","raw_type":"Text"},{"id":"pmh:oai:pubmedcentral.nih.gov:7731321","is_oa":true,"landing_page_url":"https://www.ncbi.nlm.nih.gov/pmc/articles/7731321","pdf_url":null,"source":{"id":"https://openalex.org/S2764455111","display_name":"PubMed Central","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors (Basel)","raw_type":"Text"}],"best_oa_location":{"id":"doi:10.3390/s20236881","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s20236881","pdf_url":"https://www.mdpi.com/1424-8220/20/23/6881/pdf?version=1606834057","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"sustainable_development_goals":[{"score":0.5799999833106995,"display_name":"Life below water","id":"https://metadata.un.org/sdg/14"}],"awards":[{"id":"https://openalex.org/G2326701412","display_name":null,"funder_award_id":"085244","funder_id":"https://openalex.org/F4320323433","funder_display_name":"Koneen S\u00e4\u00e4ti\u00f6"}],"funders":[{"id":"https://openalex.org/F4320310055","display_name":"It\u00e4-Suomen Yliopisto","ror":"https://ror.org/00cyydd11"},{"id":"https://openalex.org/F4320323433","display_name":"Koneen S\u00e4\u00e4ti\u00f6","ror":"https://ror.org/05jwty529"}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3107782401.pdf","grobid_xml":"https://content.openalex.org/works/W3107782401.grobid-xml"},"referenced_works_count":52,"referenced_works":["https://openalex.org/W262849696","https://openalex.org/W1446345704","https://openalex.org/W1561878391","https://openalex.org/W1963519550","https://openalex.org/W1966316840","https://openalex.org/W1971573716","https://openalex.org/W1975731452","https://openalex.org/W1976531972","https://openalex.org/W1977872993","https://openalex.org/W1988801924","https://openalex.org/W2005756108","https://openalex.org/W2010078738","https://openalex.org/W2023446188","https://openalex.org/W2044935351","https://openalex.org/W2055111479","https://openalex.org/W2060336684","https://openalex.org/W2063178769","https://openalex.org/W2065913698","https://openalex.org/W2072292954","https://openalex.org/W2073020394","https://openalex.org/W2077592354","https://openalex.org/W2080325451","https://openalex.org/W2084889478","https://openalex.org/W2092904577","https://openalex.org/W2110854016","https://openalex.org/W2141643592","https://openalex.org/W2315408934","https://openalex.org/W2428128352","https://openalex.org/W2487734837","https://openalex.org/W2492856304","https://openalex.org/W2592218049","https://openalex.org/W2753270115","https://openalex.org/W2775419188","https://openalex.org/W2884023425","https://openalex.org/W2887218677","https://openalex.org/W2913556673","https://openalex.org/W2945531111","https://openalex.org/W2949774981","https://openalex.org/W2990572318","https://openalex.org/W3008756584","https://openalex.org/W3014604071","https://openalex.org/W3082247220","https://openalex.org/W3163617311","https://openalex.org/W4240875361","https://openalex.org/W4241716278","https://openalex.org/W4285719527","https://openalex.org/W6628601968","https://openalex.org/W6661623937","https://openalex.org/W6717866399","https://openalex.org/W6722724970","https://openalex.org/W6762795202","https://openalex.org/W6869282840"],"related_works":["https://openalex.org/W2317936852","https://openalex.org/W2384025460","https://openalex.org/W3213794432","https://openalex.org/W2772592739","https://openalex.org/W2084297951","https://openalex.org/W2968267535","https://openalex.org/W2802240800","https://openalex.org/W2953752944","https://openalex.org/W4383504230","https://openalex.org/W2885145761"],"abstract_inverted_index":{"The":[0,99,115,134,152],"trophic":[1,180],"state":[2,66,181,245],"of":[3,37,50,63,86,96,101,164,182,202,246,249],"Lake":[4,28,113,183,250],"Ladoga":[5,184],"was":[6,104],"studied":[7],"during":[8],"the":[9,13,38,44,48,64,81,87,93,107,144,147,156,178,198,226,238,244],"period":[10],"1997-2019,":[11],"using":[12],"Copernicus":[14],"Marine":[15],"Environmental":[16],"Monitoring":[17],"Service":[18],"(CMEMS)":[19],"GlobColour-merged":[20],"chlorophyll-a":[21],"OC5":[22],"algorithm":[23],"(GlobColour":[24],"CHL-OC5)":[25],"satellite":[26],"observations.":[27],"Ladoga,":[29],"in":[30,80,110,112,121,146,207,216],"general,":[31],"is":[32,89,149,195,220,231],"mesotrophic":[33],"but":[34,225],"certain":[35],"parts":[36],"lake":[39,82,88],"have":[40,67,72],"been":[41,68],"eutrophic":[42],"since":[43],"1960s":[45],"due":[46],"to":[47,91,105,188,222,242],"discharge":[49],"wastewater":[51],"from":[52],"industrial,":[53],"urban,":[54],"and":[55,83,162,191],"agricultural":[56],"sources.":[57],"Since":[58],"then,":[59],"many":[60],"ecological":[61],"assessments":[62],"Lake's":[65],"made.":[69],"These":[70,171],"studies":[71,235],"indicated":[73],"that":[74,185,197],"various":[75],"changes":[76],"are":[77],"taking":[78],"place":[79],"continuous":[84],"monitoring":[85],"essential":[90],"update":[92],"current":[94,179,239],"knowledge":[95],"its":[97],"state.":[98],"aim":[100],"this":[102],"study":[103],"assess":[106,237],"long-term":[108],"trend":[109,201],"chl-a":[111,122,169],"Ladoga.":[114,251],"results":[116],"showed":[117],"a":[118,125,174,214],"gradual":[119],"reduction":[120],"concentration,":[123],"indicating":[124],"moderate":[126],"improvement.":[127],"Chl-a":[128],"concentrations":[129],"(minimum-maximum":[130],"values)":[131],"varied":[132],"spatially.":[133],"shallow":[135],"southern":[136],"shores":[137],"did":[138],"not":[139],"show":[140,167],"any":[141],"improvement":[142],"while":[143],"situation":[145],"north":[148],"much":[150],"better.":[151],"shore":[153],"areas":[154],"around":[155],"functioning":[157],"paper":[158],"mill":[159],"at":[160],"Pitk\u00e4ranta":[161],"city":[163],"Sortavala":[165],"still":[166],"high":[168],"values.":[170],"findings":[172],"provide":[173],"general":[175],"reference":[176],"on":[177,228],"could":[186,236],"contribute":[187],"improve":[189],"policy":[190],"management":[192],"strategies.":[193],"It":[194],"assumed":[196],"present":[199],"warming":[200],"surface":[203],"water":[204,229,247],"may":[205],"result":[206],"phytoplankton":[208],"growth":[209],"increase,":[210],"thus":[211],"partly":[212],"offsetting":[213],"decrease":[215],"nutrient":[217],"load.":[218],"Precipitation":[219],"thought":[221],"be":[223],"increasing,":[224],"influence":[227],"quality":[230,248],"less":[232],"clear.":[233],"Future":[234],"chemical":[240],"composition":[241],"determine":[243]},"counts_by_year":[{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":3},{"year":2023,"cited_by_count":3},{"year":2022,"cited_by_count":5},{"year":2021,"cited_by_count":1}],"updated_date":"2026-05-06T08:25:59.206177","created_date":"2025-10-10T00:00:00"}