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Sea-Surface Temperature Anomalies: El Niño

OceansPhysical Environment

A composite of sea-surface temperature anomalies during El Niño from November to March during the following years: 1958, 1966, 1973, 1983, 1987, 1992, 1996, and 1998. When sea-surface temperatures in the tropical eastern Pacific rise well above normal, it is known as an El Niño event.

NOAA

Sea-surface temperature anomalies during El Niño. The most intense warming (2 to 2.25 degrees Celsius, dark brown) occurs off the coast of South America. Cooler areas (negative 2.25 to negative 2 degrees Celsius, dark blue) are in the Arctic Ocean.

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Sea-Surface Temperature Anomalies: El Niño

Nitrogen Oxide (NOₓ) Emissions

Students per Teacher in Primary School

COVID-19 Case Mortality Rate

Major Territorial Acquisitions (U.S.)

-0.25 to 0.25

0.75 to 1.0

1.0 to 1.25

1.25 to 1.5

1.5 to 1.75

Class

Rank

Kilotons per year

Class

Rank

Value

Class

Rank

Percent

Extent of U.S., 1803

Louisiana Purchase, 1803

West Florida, 1810–1813

British Cession, 1818

East Florida, 1819

Northern Maine, 1842

Texas Annexation, 1845

Oregon Country, 1846

Mexican Cession, 1848

Gadsden Purchase, 1853

Alaska, 1867

Hawaii, 1898

0.311%1.20%0.159%0.444%2.10%91.6%79.0%7.81%30.8%98.3%16.6%50.1%57.7%66.4%12.6%63.8%91.5%
0.16.0