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Ocean Heat Content - Yearly Difference from Average

Ocean Heat Content - Yearly Difference from Average
Dataset Details
Yearly images from 2000 to 2023
Download Directories
Click on any of the links below to view a directory listing of images and assets related to this dataset.
Q:How much heat energy is being stored in Earth’s ocean?
A:

Colors on the map show where instruments detected more or less heat energy in the top 2,300 feet of water than the long-term average annual heat content. Orange areas show where heat content was higher than the long-term average. Blue areas show where heat content was lower than the long-term average. The darker the shade of blue or orange, the larger the heat-content difference from the long-term average.

Q:Where do these measurements come from?
A:

Oceanographers use a range of temperature-sensing instruments to measure heat energy in the ocean. Among them is a fleet of more than 3,000 robotic “floats” that measure ocean temperature in the top 2,300 feet of water. Scientists constantly compare data from floats, probes, and Conductivity-Temperature-Depth (CTD) sensors to verify that the values they produce make sense.

Q:What do the colors mean?
A:

Colors show the relative differences in average heat energy in the top 2,300 feet of the ocean, computed for each year, compared to long-term average annual heat content. The long-term temperature climatology is the average of five “decadal” climatologies calculated for 1955-1964, 1965-1974, 1975-1984, 1985-1994, and 1995-2006. Orange and blue areas show where the upper ocean’s heat storage rose or fell by up to 3 gigajoules (109 joules) per square meter at the surface. Areas where heat content was close to the long-term average are white.

Q:Why do these data matter?
A:

The ocean’s ability to store and release heat over long periods of time gives it a central role in stabilizing Earth’s climate system. Short-term variations in heat content due to natural climate patterns like El Niño influence regional climates, tropical cyclones, and marine life, including coral reefs and fisheries. As the ocean takes up more heat due to global warming, water temperatures rise, causing it to increase in volume, raising global sea level around the world. Warming ocean waters also have major implications for marine ecosystems, melting ice caps, and precipitation patterns.

Q:How did you produce these snapshots?
A:

Data Snapshots are derivatives of existing data products. To meet the needs of a broad audience, we present the same data as current products in a simplified visual style. This set of snapshots is based on data from NOAA’s Ocean Climate Laboratory.

To produce the maps for Data Snapshots, we run a script that accesses the source data, applies a custom color palette, and assembles them on a prepared base map.

References

Levitus, S., et al. (2012), World ocean heat content and thermosteric sea level change (0–2000 m), 1955–2010, Geophys. Res. Lett., 39, L10603.

 
Data Provider
NCEI Ocean Climate Laboratory OCL Products
Source Data Product
NCEI Global Ocean Heat and Salt Content Yearly and 3-Month 0-700m Heat Content
Access to Source Data
Annual Ocean Heat Content
Reviewer
Gregory C. Johnson, NOAA Pacific Marine Environmental Laboratory

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