State of the Climate Global Analysis August 2012

פורסם: 18 בספט׳ 2012, 0:07 על ידי: Sustainability Org   [ עודכן 18 בספט׳ 2012, 0:07 ]
National Oceanic and Atmospheric Administration, National Climatic Data Center, 18/9/2012
 
august extremes
August 2012 Selected Climate Anomalies and Events Map (press to enlarge)
 
Global Highlights
  • The average combined global land and ocean surface temperature for August 2012 was 0.62°C (1.12°F) above the 20th century average of 15.6°C (60.1°F). This is the fourth warmest August since records began in 1880.
  • The globally-averaged land surface temperature for August 2012 was the second warmest August on record, at 0.90°C (1.62°F) above average, while the globally-averaged ocean surface temperature was the fifth warmest on record, at 0.52°C (0.94°F) above average.
  • ENSO-neutral conditions continued in the eastern equatorial Pacific Ocean during August 2012. El Niño conditions are likely to emerge in September.
  • The average combined global land and ocean surface temperature for June–August 2012 was 0.64°C (1.15°F) above the 20th century average of 15.6°C (60.1°F), marking the third warmest June–August on record.
  • The globally-averaged land surface temperature for June–August 2012 was the all-time warmest June–August on record, at 1.03°C (1.85°F) above average.
  • The combined global land and ocean average surface temperature for January–August 2012 was the ninth warmest such period on record, at 0.56°C (1.01°F) above the 20th century average.


Temperatures 

tempratures august 2012

Did You Know?

Global Temperature Percentile Maps

Global anomaly maps are an essential tool when describing the current state of the climate across the globe. Temperature anomaly maps tell us whether the temperature observed for a specific place and time period (for example, month, season, or year) was warmer or cooler than a reference value, which is usually a 30-year average, and by how much.

The August 2012 Global State of the Climate report introduces percentile maps that complement the information provided by the anomaly maps. These new maps provide additional information by placing the temperature anomaly observed for a specific place and time period into historical perspective, showing how the most current month, season or year compares with the past.

Temperature Climatological Ranking

In order to place the month, season, or year into historical perspective, each grid point's temperature values for the time period of interest (for example all August values from 1880 to 2012) are sorted from warmest to coolest, with ranks assigned to each value. The numeric rank represents the position of that particular value throughout the historical record. The length of record increases with each year. It is important to note that each grid point's period of record may vary, but all grid points displayed in the map have a minimum of 80 years of data. For the global temperature anomaly record, the data does extend back to 1880. But not all grid points have data from 1880 to present. Considering a grid point with a period of record of 133 years, a value of "1" in the temperature record refers to record warmest, while a value of "133" refers to record coldest.

The Warmer than Average, Near Average, and Cooler than Average shadings on the temperature percentile maps represent the bottom, middle, and upper tercile (or three equal portions) of the sorted values or distribution, respectively. Much Warmer than Average and Much Cooler than Average, refer to the lowest and uppermost decile (top or bottom 10 percent) of the distribution, respectively. For a 133-year period, Warmer than Average (Cooler than Average) would represent one of the 44 warmest (coolest) such periods on record. However, if the value ranked among the 13 warmest (coolest) on record, that value would be classified as Much Warmer than Average (Much Cooler than Average). Near Average would represent an average temperature value that was in the middle third (rank of 45 to 89) on record.

 

Precipitation

precipitation percentiles august 2012

Did You Know?

Global Precipitation Percentile Maps

Global anomaly maps are an essential tool when describing the current state of the climate across the globe. Precipitation anomaly maps tell us whether the precipitation observed for a specific place and time period (for example, month, season, or year) was drier or wetter than a reference value, which is usually a 30-year average, and by how much.

The August 2012 Global State of the Climate report introduces percentile maps that complement the information provided by the anomaly maps. These new maps provide additional information by placing the precipitation anomaly observed for a specific place and time period into historical perspective, showing how the most current month, season or year compares with the past.

Precipitation Climatological Ranking

In order to place the month, season, or year into historical perspective, each grid point's precipitation values for the time period of interest (for example all August values from 1900 to 2012) are sorted from driest to wettest, with ranks assigned to each value. The numeric rank represents the position of that particular value throughout the historical record. The length of record increases with each year. It is important to note that each grid point's period of record may vary, but all grid points displayed in the map have a minimum of 80 years of data. For example, considering a grid point with a period of record of 113 years, a value of "1" in the precipitation record refers to record driest, while a value of "113" refers to record wettest.

The Drier than Average, Near Average, and Wetter than Average shadings on the precipitation percentile maps represent the bottom, middle, and upper tercile (or three equal portions) of the sorted values or distribution, respectively. Much Drier than Average and Much Wetter than Average, refer to the lowest and uppermost decile (top or bottom 10 percent) of the distribution, respectively. For a 113-year period, Drier than Average (Wetter than Average) would represent one of the 38 driest (wettest) such periods on record. However, if the value ranked among the 11 driest (wettest) on record, that value would be classified as Much Drier than Average (Much Wetter than Average). Near Average would represent an average precipitation value that was in the middle third (rank of 39 to 75) on record.


Citing This Report

NOAA National Climatic Data Center, State of the Climate: Global Analysis for August 2012, published online September 2012, retrieved on September 18, 2012 from http://www.ncdc.noaa.gov/sotc/global/.
 

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