# Renamed: before they were marine heatwaves > In our corpus, the phrase appears in no paper before 2016 and takes over by 2019. The events are older than the name. - Author: Rohit Pawar, unkwn42 - Published: 2026-10-16 - Canonical: https://www.unkwn42.com/blog/renamed-marine-heatwaves - Topics: terminology, marine heatwaves, renamed - Cite as: Pawar, R. (2026). Renamed: before they were marine heatwaves. unkwn42 blog. https://www.unkwn42.com/blog/renamed-marine-heatwaves ## Key findings - In our corpus of 438,284 climate and earth science papers, no paper uses the phrase "marine heatwave" before 2016. - It arrives in 2016, overtakes "warm anomaly" in an ocean, sea or marine setting in 2019, and is in 173 papers in 2025. - The events are older than the name, so a search for "marine heatwave" misses the earlier work filed under other words. The word "podcast" was coined in 2004. People were downloading radio shows to listen to later before that; they just called it something else. Search an archive for "podcast" and everything from before 2004 is invisible, even though the thing itself was there. Research has the same problem, and it is worse, because nobody tells you when the name changed. ## A name arrives Marine heatwaves are spells of unusually warm sea temperatures. They matter for coral, kelp, fisheries and the weather on land. Today the phrase is everywhere. So we counted, year by year, the papers in our corpus of 438,284 climate and earth science papers whose title or abstract uses it. ![Papers a year using "marine heatwave" and "warm anomaly" in the unkwn42 corpus, 2000 to 2025](https://www.unkwn42.com/blog/renamed-marine-heatwaves/terms-by-year.svg "Papers a year whose title or abstract uses each phrase. “Warm anomaly” is counted only alongside the ocean, the sea or marine. The numbers are in the [CSV](https://www.unkwn42.com/blog/renamed-marine-heatwaves/terms-by-year.csv).") Before 2016, no paper in our corpus uses the phrase at all. Then it arrives: 3 papers in 2016, 4 in 2017, 14 in 2018. In 2019 it overtakes "warm anomaly" in an ocean, sea or marine setting, 20 papers to 18. By 2025 it is in 173 papers a year. "Warm anomaly" stays where it always was, at 5 to 26 papers a year. The earliest papers that use it are about events that happened long before the name. One of the first, from 2016, is titled [Frequency of marine heatwaves in the North Atlantic and North Pacific since 1950](https://doi.org/10.1002/2015gl067308). The phenomenon had been measured for decades. The literature just filed it under other words. ## What a search misses If you search for "marine heatwave" today, you get the last ten years of work, and almost nothing from before. A paper from 2009 about anomalous warming off a coastline can be the closest prior work to your idea and never come up, because its authors could not have used a phrase that did not exist yet. This is terminology drift, and climate science is full of it. The field sits where oceanography, ecology, hydrology, atmospheric physics and economics meet, and each names things its own way. The same finding can live in two literatures, under two names, with neither citing the other. ## What to do about it Three things help. 1. Before you search, ask when your term came into use. If it is recent, the older work is under another name. 2. Search the descriptions, not just the label: "warm anomaly", "anomalous warming", "ocean warming event". 3. Let a tool do the second part for you. unkwn42 looks for the same idea under other names, and flags the papers it found that way, so you can see why each one is there. ## How we counted - The corpus: 438,284 journal articles with abstracts, in English, across eleven OpenAlex topic areas in climate and earth science, built in June 2026. We left out 2026 because the year is incomplete. - The count: papers whose title or abstract matches the phrase, using Postgres full-text search with English stemming, so "heatwaves" counts too. "Warm anomaly" had to appear alongside "ocean", "sea" or "marine". - Two records matched "marine heatwave" before 2016 but are not papers about it: an untitled record from 2000, and a 2011 record whose title belongs to one paper and whose abstract belongs to a 2021 paper we also hold. We left both out. - Our corpus holds a share of each year's literature, not all of it, so read the shape of the lines, not the totals. One gap stood out: the paper that set out how to define a marine heatwave, [Hobday and colleagues, 2016](https://doi.org/10.1016/j.pocean.2015.12.014), is not in our corpus, because OpenAlex holds no abstract for it. We are telling you because a corpus you cannot see the edges of is worse than one with gaps.