Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2040026664', 'doi': 'https://doi.org/10.1016/j.orggeochem.2008.03.004', 'title': 'Isotopic composition of nitrate in five German rivers discharging into the North Sea', 'display_name': 'Isotopic composition of nitrate in five German rivers discharging into the North Sea', 'publication_year': 2008, 'publication_date': '2008-03-16', 'ids': {'openalex': 'https://openalex.org/W2040026664', 'doi': 'https://doi.org/10.1016/j.orggeochem.2008.03.004', 'mag': '2040026664'}, 'language': 'en', 'primary_location': {'is_oa': False, 'landing_page_url': 'https://doi.org/10.1016/j.orggeochem.2008.03.004', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S196384270', 'display_name': 'Organic Geochemistry', 'issn_l': '0146-6380', 'issn': ['0146-6380', '1873-5290'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320990', 'host_organization_name': 'Elsevier BV', 'host_organization_lineage': ['https://openalex.org/P4310320990'], 'host_organization_lineage_names': ['Elsevier BV'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref'], 'open_access': {'is_oa': False, 'oa_status': 'closed', 'oa_url': None, 'any_repository_has_fulltext': False}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5067887373', 'display_name': 'Astrid Johannsen', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I113456305', 'display_name': 'Leuphana University of Lüneburg', 'ror': 'https://ror.org/02w2y2t16', 'country_code': 'DE', 'type': 'education', 'lineage': ['https://openalex.org/I113456305']}, {'id': 'https://openalex.org/I4210136150', 'display_name': 'L3S Research Center', 'ror': 'https://ror.org/039t4wk02', 'country_code': 'DE', 'type': 'facility', 'lineage': ['https://openalex.org/I114112103', 'https://openalex.org/I4210136150', 'https://openalex.org/I94509681']}], 'countries': ['DE'], 'is_corresponding': True, 'raw_author_name': 'Astrid Johannsen', 'raw_affiliation_strings': ['GKSS Research Center, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany', 'Institute of Ecology and Environmental Chemistry, University of Lüneburg, Scharnhorststrasse 1, D-21335 Lüneburg, Germany'], 'affiliations': [{'raw_affiliation_string': 'Institute of Ecology and Environmental Chemistry, University of Lüneburg, Scharnhorststrasse 1, D-21335 Lüneburg, Germany', 'institution_ids': ['https://openalex.org/I113456305']}, {'raw_affiliation_string': 'GKSS Research Center, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany', 'institution_ids': ['https://openalex.org/I4210136150']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5039333045', 'display_name': 'Kirstin Dähnke', 'orcid': 'https://orcid.org/0000-0001-5133-7082'}, 'institutions': [{'id': 'https://openalex.org/I4210136150', 'display_name': 'L3S Research Center', 'ror': 'https://ror.org/039t4wk02', 'country_code': 'DE', 'type': 'facility', 'lineage': ['https://openalex.org/I114112103', 'https://openalex.org/I4210136150', 'https://openalex.org/I94509681']}], 'countries': ['DE'], 'is_corresponding': False, 'raw_author_name': 'Kirstin Dähnke', 'raw_affiliation_strings': ['GKSS Research Center, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany'], 'affiliations': [{'raw_affiliation_string': 'GKSS Research Center, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany', 'institution_ids': ['https://openalex.org/I4210136150']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5026696217', 'display_name': 'Kay‐Christian Emeis', 'orcid': 'https://orcid.org/0000-0003-0459-913X'}, 'institutions': [{'id': 'https://openalex.org/I4210136150', 'display_name': 'L3S Research Center', 'ror': 'https://ror.org/039t4wk02', 'country_code': 'DE', 'type': 'facility', 'lineage': ['https://openalex.org/I114112103', 'https://openalex.org/I4210136150', 'https://openalex.org/I94509681']}, {'id': 'https://openalex.org/I159176309', 'display_name': 'Universität Hamburg', 'ror': 'https://ror.org/00g30e956', 'country_code': 'DE', 'type': 'education', 'lineage': ['https://openalex.org/I159176309']}], 'countries': ['DE'], 'is_corresponding': False, 'raw_author_name': 'Kay Emeis', 'raw_affiliation_strings': ['GKSS Research Center, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany', 'IfBM, University of Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany'], 'affiliations': [{'raw_affiliation_string': 'GKSS Research Center, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany', 'institution_ids': ['https://openalex.org/I4210136150']}, {'raw_affiliation_string': 'IfBM, University of Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany', 'institution_ids': ['https://openalex.org/I159176309']}]}], 'institution_assertions': [], 'countries_distinct_count': 1, 'institutions_distinct_count': 3, 'corresponding_author_ids': ['https://openalex.org/A5067887373'], 'corresponding_institution_ids': ['https://openalex.org/I113456305', 'https://openalex.org/I4210136150'], 'apc_list': {'value': 3050, 'currency': 'USD', 'value_usd': 3050, 'provenance': 'doaj'}, 'apc_paid': None, 'fwci': 9.835, 'has_fulltext': True, 'fulltext_origin': 'ngrams', 'cited_by_count': 134, 'citation_normalized_percentile': {'value': 0.999568, 'is_in_top_1_percent': True, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 97, 'max': 98}, 'biblio': {'volume': '39', 'issue': '12', 'first_page': '1678', 'last_page': '1689'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T10398', 'display_name': 'Groundwater and Isotope Geochemistry', 'score': 0.9992, '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'}}, 'topics': [{'id': 'https://openalex.org/T10398', 'display_name': 'Groundwater and Isotope Geochemistry', 'score': 0.9992, '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/T11311', 'display_name': 'Soil and Water Nutrient Dynamics', 'score': 0.9984, 'subfield': {'id': 'https://openalex.org/subfields/2304', 'display_name': 'Environmental Chemistry'}, '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/T10032', 'display_name': 'Marine and coastal ecosystems', 'score': 0.9948, '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/tracer', 'display_name': 'TRACER', 'score': 0.4426337}, {'id': 'https://openalex.org/keywords/isotopic-signature', 'display_name': 'Isotopic signature', 'score': 0.43718958}, {'id': 'https://openalex.org/keywords/isotope-analysis', 'display_name': 'Isotope Analysis', 'score': 0.4321329}], 'concepts': [{'id': 'https://openalex.org/C2776384668', 'wikidata': 'https://www.wikidata.org/wiki/Q182168', 'display_name': 'Nitrate', 'level': 2, 'score': 0.8950133}, {'id': 'https://openalex.org/C39432304', 'wikidata': 'https://www.wikidata.org/wiki/Q188847', 'display_name': 'Environmental science', 'level': 0, 'score': 0.6372537}, {'id': 'https://openalex.org/C88160329', 'wikidata': 'https://www.wikidata.org/wiki/Q47053', 'display_name': 'Estuary', 'level': 2, 'score': 0.57754517}, {'id': 'https://openalex.org/C76886044', 'wikidata': 'https://www.wikidata.org/wiki/Q2883300', 'display_name': 'Hydrology (agriculture)', 'level': 2, 'score': 0.5697905}, {'id': 'https://openalex.org/C22117777', 'wikidata': 'https://www.wikidata.org/wiki/Q17148629', 'display_name': 'Stable isotope ratio', 'level': 2, 'score': 0.44841048}, {'id': 'https://openalex.org/C2778863792', 'wikidata': 'https://www.wikidata.org/wiki/Q16909918', 'display_name': 'TRACER', 'level': 2, 'score': 0.4426337}, {'id': 'https://openalex.org/C146458902', 'wikidata': 'https://www.wikidata.org/wiki/Q905807', 'display_name': 'Isotopic signature', 'level': 3, 'score': 0.43718958}, {'id': 'https://openalex.org/C51813073', 'wikidata': 'https://www.wikidata.org/wiki/Q518459', 'display_name': 'Isotope analysis', 'level': 2, 'score': 0.4321329}, {'id': 'https://openalex.org/C2779334269', 'wikidata': 'https://www.wikidata.org/wiki/Q3080293', 'display_name': 'Isotope fractionation', 'level': 3, 'score': 0.43112922}, {'id': 'https://openalex.org/C97428945', 'wikidata': 'https://www.wikidata.org/wiki/Q15305109', 'display_name': 'Fractionation', 'level': 2, 'score': 0.40896308}, {'id': 'https://openalex.org/C107872376', 'wikidata': 'https://www.wikidata.org/wiki/Q321355', 'display_name': 'Environmental chemistry', 'level': 1, 'score': 0.320278}, {'id': 'https://openalex.org/C111368507', 'wikidata': 'https://www.wikidata.org/wiki/Q43518', 'display_name': 'Oceanography', 'level': 1, 'score': 0.29073283}, {'id': 'https://openalex.org/C127313418', 'wikidata': 'https://www.wikidata.org/wiki/Q1069', 'display_name': 'Geology', 'level': 0, 'score': 0.2025362}, {'id': 'https://openalex.org/C185592680', 'wikidata': 'https://www.wikidata.org/wiki/Q2329', 'display_name': 'Chemistry', 'level': 0, 'score': 0.14961663}, {'id': 'https://openalex.org/C121332964', 'wikidata': 'https://www.wikidata.org/wiki/Q413', 'display_name': 'Physics', 'level': 0, 'score': 0.0}, {'id': 'https://openalex.org/C187320778', 'wikidata': 'https://www.wikidata.org/wiki/Q1349130', 'display_name': 'Geotechnical engineering', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C178790620', 'wikidata': 'https://www.wikidata.org/wiki/Q11351', 'display_name': 'Organic chemistry', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C62520636', 'wikidata': 'https://www.wikidata.org/wiki/Q944', 'display_name': 'Quantum mechanics', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C185544564', 'wikidata': 'https://www.wikidata.org/wiki/Q81197', 'display_name': 'Nuclear physics', 'level': 1, 'score': 0.0}], 'mesh': [], 'locations_count': 1, 'locations': [{'is_oa': False, 'landing_page_url': 'https://doi.org/10.1016/j.orggeochem.2008.03.004', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S196384270', 'display_name': 'Organic Geochemistry', 'issn_l': '0146-6380', 'issn': ['0146-6380', '1873-5290'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320990', 'host_organization_name': 'Elsevier BV', 'host_organization_lineage': ['https://openalex.org/P4310320990'], 'host_organization_lineage_names': ['Elsevier BV'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}], 'best_oa_location': None, 'sustainable_development_goals': [{'score': 0.73, 'id': 'https://metadata.un.org/sdg/14', 'display_name': 'Life below water'}], 'grants': [], 'datasets': [], 'versions': [], 'referenced_works_count': 78, 'referenced_works': ['https://openalex.org/W1545116711', 'https://openalex.org/W1554236077', 'https://openalex.org/W156423059', 'https://openalex.org/W1577987578', 'https://openalex.org/W1593379149', 'https://openalex.org/W1610719105', 'https://openalex.org/W1838864480', 'https://openalex.org/W1966396852', 'https://openalex.org/W1979993180', 'https://openalex.org/W1980793623', 'https://openalex.org/W1984598761', 'https://openalex.org/W1986962259', 'https://openalex.org/W1988623303', 'https://openalex.org/W1992954227', 'https://openalex.org/W1999241836', 'https://openalex.org/W2002418394', 'https://openalex.org/W2003157314', 'https://openalex.org/W2003301129', 'https://openalex.org/W2003912780', 'https://openalex.org/W2005788368', 'https://openalex.org/W2007876446', 'https://openalex.org/W2008811203', 'https://openalex.org/W2020313077', 'https://openalex.org/W2021659822', 'https://openalex.org/W2022527794', 'https://openalex.org/W2025254507', 'https://openalex.org/W2029741085', 'https://openalex.org/W2032292978', 'https://openalex.org/W2033978351', 'https://openalex.org/W2035298330', 'https://openalex.org/W2035503922', 'https://openalex.org/W2038943195', 'https://openalex.org/W2042265912', 'https://openalex.org/W2048227697', 'https://openalex.org/W2049705339', 'https://openalex.org/W2057793940', 'https://openalex.org/W2064059397', 'https://openalex.org/W2064866143', 'https://openalex.org/W2068312108', 'https://openalex.org/W2068844696', 'https://openalex.org/W2069674478', 'https://openalex.org/W2070918882', 'https://openalex.org/W2073215923', 'https://openalex.org/W2075406903', 'https://openalex.org/W2075694228', 'https://openalex.org/W2075978408', 'https://openalex.org/W2088485038', 'https://openalex.org/W2092170981', 'https://openalex.org/W2093014841', 'https://openalex.org/W2094180197', 'https://openalex.org/W2102886976', 'https://openalex.org/W2103510450', 'https://openalex.org/W2107121382', 'https://openalex.org/W2108675948', 'https://openalex.org/W2112448118', 'https://openalex.org/W2130055047', 'https://openalex.org/W2131057322', 'https://openalex.org/W2132245027', 'https://openalex.org/W2150899751', 'https://openalex.org/W2154163525', 'https://openalex.org/W2158141061', 'https://openalex.org/W21588666', 'https://openalex.org/W2159608878', 'https://openalex.org/W2163523522', 'https://openalex.org/W2170120908', 'https://openalex.org/W2179255420', 'https://openalex.org/W2279665554', 'https://openalex.org/W2280631082', 'https://openalex.org/W2466518822', 'https://openalex.org/W330580520', 'https://openalex.org/W4229842018', 'https://openalex.org/W4238213840', 'https://openalex.org/W4255433472', 'https://openalex.org/W4285719527', 'https://openalex.org/W653947198', 'https://openalex.org/W755945079', 'https://openalex.org/W79608234', 'https://openalex.org/W83346402'], 'related_works': ['https://openalex.org/W4386956250', 'https://openalex.org/W2798215084', 'https://openalex.org/W2626327740', 'https://openalex.org/W2351407506', 'https://openalex.org/W2350271716', 'https://openalex.org/W2282277134', 'https://openalex.org/W2246878148', 'https://openalex.org/W2232772739', 'https://openalex.org/W2131239316', 'https://openalex.org/W2086330295'], 'abstract_inverted_index': None, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2040026664', 'counts_by_year': [{'year': 2024, 'cited_by_count': 4}, {'year': 2023, 'cited_by_count': 11}, {'year': 2022, 'cited_by_count': 17}, {'year': 2021, 'cited_by_count': 12}, {'year': 2020, 'cited_by_count': 10}, {'year': 2019, 'cited_by_count': 6}, {'year': 2018, 'cited_by_count': 9}, {'year': 2017, 'cited_by_count': 8}, {'year': 2016, 'cited_by_count': 8}, {'year': 2015, 'cited_by_count': 6}, {'year': 2014, 'cited_by_count': 10}, {'year': 2013, 'cited_by_count': 4}, {'year': 2012, 'cited_by_count': 7}], 'updated_date': '2025-01-10T07:19:54.228153', 'created_date': '2016-06-24'}