Upper Air - January 2013


Troposphere

Lower Troposphere

January Lower Troposphere
January Anomaly Rank
(out of 35 years)
Record Years Decadal Trend
°C °F Year °C °F °C °F
UAH +0.51 +0.92 Coolest 34th 1989 -0.44 -0.79 +0.14 +0.25
Warmest 2nd 2010 +0.59 +1.06
RSS +0.33 +0.59 Coolest 31st 1989 -0.41 -0.74 +0.13 +0.23
Warmest 4th 2010 +0.48 +0.86
Ties: 2003

Mid-troposphere

January Mid-troposphere
January Anomaly Rank
(out of 35 years)
Record Years Decadal Trend
°C °F Year °C °F °C °F
UAH +0.38 +0.68 Coolest 33rd 2000 -0.37 -0.67 +0.03 +0.05
Warmest 2nd 1998 +0.48 +0.86
Ties: 2010
RSS +0.47 +0.85 Coolest 35th 1984 -0.38 -0.68 +0.08 +0.15
Warmest 1st 2013 +0.47 +0.85
UW-UAH +0.45 +0.81 Coolest 33rd 1984 -0.46 -0.83 +0.08 +0.15
Warmest 3rd 1998 +0.58 +1.04
UW-RSS +0.55 +0.99 Coolest 35th 1984 -0.47 -0.85 +0.13 +0.24
Warmest 1st 2013 +0.55 +0.99

Stratosphere

January Stratosphere
January Anomaly Rank
(out of 35 years)
Record Years Decadal Trend
°C °F Year °C °F °C °F
UAH -0.35 -0.63 Coolest 12th 2006 -0.57 -1.03 -0.38 -0.68
Warmest 24th 1983 +1.43 +2.57
RSS -0.40 -0.72 Coolest 7th 2006 -0.58 -1.04 -0.34 -0.61
Warmest 28th 1983 +1.35 +2.43
Ties: 2001

Background Information

Temperatures above the Earth's surface are measured within the lower troposphere, middle troposphere, and stratosphere using in-situ balloon-borne instruments (radiosondes) and polar-orbiting satellites (NOAA's TIROS-N). The radiosonde and satellite records have been adjusted to remove time-dependent biases (artificialities caused by changes in radiosonde instruments and measurement practices as well as changes in satellite instruments and orbital features through time). Global averages from radiosonde data are available from 1958 to present, while satellite measurements date back to 1979.

The mid-troposphere temperatures are centered in the in the atmospheric layer approximately 3–10 km [2–6 miles] above the Earth's surface, which also includes a portion of the lower stratosphere. (The Microwave Sounding Unit [MSU] channel used to measure mid-tropospheric temperatures receives about 25 percent of its signal above 10 km [6 miles].) Because the stratosphere has cooled due to increasing greenhouse gases in the troposphere and losses of ozone in the stratosphere, the stratospheric contribution to the tropospheric average, as measured from satellites, creates an artificial component of cooling to the mid-troposphere temperatures. The University of Washington (UW) versions of the UAH and RSS analyses attempt to remove the stratospheric influence from the mid-troposphere measurements, and as a result the UW versions tend to have a larger warming trend than either the UAH or RSS versions. For additional information, please see NCDC's Microwave Sounding Unit page.

The radiosonde data used in this global analysis were developed using the Lanzante, Klein, Seidel (2003) ("LKS") bias-adjusted dataset and the First Difference Method (Free et al. 2004) (RATPAC). Additional details are available. Satellite data have been adjusted by the Global Hydrology and Climate Center at the University of Alabama in Huntsville (UAH). An independent analysis is also performed by Remote Sensing Systems (RSS) and a third analysis has been performed by Dr. Qiang Fu of the University of Washington (UW) (Fu et al. 2004)** to remove the influence of the stratosphere on the mid-troposphere value. Global averages from radiosonde data are available from 1958 to present, while satellite measurements began in 1979.

References

Citing This Report

NOAA National Climatic Data Center, State of the Climate: Upper Air for January 2013, published online February 2013, retrieved on December 22, 2014 from http://www.ncdc.noaa.gov/sotc/upper-air/2013/1.