Changes in Sea Surface Temperatures and Primary Productivity in the Northern Japan Sea Since the Pliocene

Changes in Sea Surface Temperatures and Primary Productivity in the Northern Japan Sea Since the Pliocene | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 2 March 2026 V1 Latest version Share on Changes in Sea Surface Temperatures and Primary Productivity in the Northern Japan Sea Since the Pliocene Authors : Chiaki Aoyagi 0009-0002-1367-5085 [email protected] , Satoshi Furota 0000-0001-8344-2434 , Tomohisa Irino 0000-0001-6941-770X , and Ken Sawada 0000-0003-3298-5716 Authors Info & Affiliations https://doi.org/10.22541/au.177247276.67038449/v1 94 views 73 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract The Japan Sea is a marginal sea connected to the surrounding oceans only through four shallow straits. It is a natural archive of the changes in ocean currents associated with the formation of the Japanese archipelago and variations in the Asian monsoon. However, the long-term response of the surface layer in the Japan Sea to tectonic movements and global environmental events remains unclear. We analyzed algal biomarkers in sediment cores from Integrated Ocean Drilling Program (IODP) Site U1423 (the northern Japan Sea off Hokkaido) to reconstruct the variations in marine primary production and paleoenvironmental changes since the Pliocene (~4 Ma). The alkenone-based SSTs displayed a cooling trend after the Northern Hemisphere Glaciation (NHG), with significant cooling at 1.7 Ma due to the strengthening of the East Asian Winter Monsoon (EAWM), which was possibly related to the emergence of the cold tongue in the eastern equatorial Pacific (EEP). After 1.2 Ma, the Tsushima Warm Current (TWC) reached the area off Hokkaido and promoted the formation of Japan Sea Proper Water (JSPW). Furthermore, we reconstructed the north−south shifts of the position of the subpolar front in the Japan Sea controlled by the balance between the TWC and EAWM. Supplementary Material File (1065915_0_merged_1771038894.pdf) Download 1.98 MB File (agu_suppinfo.docx) Download 1.06 MB File (manuscript_260211.docx) Download 1.72 MB Information & Authors Information Version history V1 Version 1 02 March 2026 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords alkenone asian monsoon cold tongue diol index japan sea nhg Authors Affiliations Chiaki Aoyagi 0009-0002-1367-5085 [email protected] Hokkaido University View all articles by this author Satoshi Furota 0000-0001-8344-2434 National Institute of Advanced Industrial Science and Technology View all articles by this author Tomohisa Irino 0000-0001-6941-770X Hokkaido University View all articles by this author Ken Sawada 0000-0003-3298-5716 Hokkaido University View all articles by this author Metrics & Citations Metrics Article Usage 94 views 73 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Chiaki Aoyagi, Satoshi Furota, Tomohisa Irino, et al. Changes in Sea Surface Temperatures and Primary Productivity in the Northern Japan Sea Since the Pliocene. Authorea . 02 March 2026. DOI: https://doi.org/10.22541/au.177247276.67038449/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. 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