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Title: Identification of Anthropogenic Climate Change Using a Second-Generation Reanalysis

Journal Article · · Journal of Geophysical Research - Atmospheres
DOI:https://doi.org/10.1029/2004JD005075· OSTI ID:15014193
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Changes in the height of the tropopause provide a sensitive indicator of human effects on climate. A previous attempt to identify human effects on tropopause height relied on information from 'first-generation' reanalyses of past weather observations. Climate data from these initial model-based reanalyses have well-documented deficiencies, raising concerns regarding the robustness of earlier detection work that employed these data. Here, we address these concerns using information from the new second-generation ERA-40 reanalysis. Over 1979 to 2001, tropopause height increases by nearly 200 meters in ERA-40, partly due to tropospheric warming. The spatial pattern of height increase is consistent with climate model predictions of the expected response to anthropogenic influences alone, significantly strengthening earlier detection results. Atmospheric temperature changes in two different satellite datasets are more highly correlated with changes in ERA-40 than with those in a first-generation reanalysis, thus illustrating the improved quality of temperature information in ERA-40. Our results provide support for claims that human activities have warmed the troposphere and cooled the lower stratosphere over the last several decades of the 20th century, and that both of these changes in atmospheric temperature have contributed to an overall increase in tropopause height.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
15014193
Report Number(s):
UCRL-JRNL-204468; TRN: US200803%%606
Journal Information:
Journal of Geophysical Research - Atmospheres, Vol. 109; ISSN 0747-7309
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
AMBIENT TEMPERATURE
CLIMATE MODELS
CLIMATES
TROPOPAUSE
WEATHER