It's going to be increased temperature, increased ocean heatcontent, loss of ice.
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Chart showing global ocean heatcontent from the surface to 2000 metres deep.
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The WMO analysis says 2018 had the highest ocean heatcontent values on record.
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But what has happened to ocean heatcontent since then?
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The ocean heatcontent data can be downloaded from the National Oceanographic Data Center here.
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When we combine surface temperatures with ocean heatcontent, as seen below, a clear picture emerges.
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It also stated that ocean heatcontent and mean sea level rise recorded new highs last year.
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Global ocean heatcontent estimates from NOAA.
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In the ocean heatcontent image above, you might notice a slight change in the trend around 2005.
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My other colleague, Dr. Lijing Cheng says: Ocean heatcontent is a vital climate indicator and is a key metric for global warming.
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Thermal strain and body heatcontent change was lower in Vest and Packs, respectively (p ≤ 0.05).
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They also collect temperature and salinity measurements along the way, which allow scientists to track changes in the heatcontent and currents in the ocean.
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Likewise, and arguably much more importantly, the heatcontent of the world's oceans has been dropping for the past four years where we have measurements.