Journal
SOLA
Volume 10, Issue -, Pages 122-126Publisher
METEOROLOGICAL SOC JAPAN
DOI: 10.2151/sola.2014-025
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Funding
- Program for Risk Information on Climate Change (SOUSEI program)
- Ministry of Education, Culture, Sports, Science and Technology of Japan [26281013, 26247079]
- Environment Research and Technology Development Fund of the Ministry of the Environment of Japan [S-10]
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A severe heat wave occurred in the southwestern United States (US) during June and July 2013. To investigate the effects of natural variability and anthropogenic climate change on this event, we generated large ensemble simulations of possible weather using the MIROC5A climate model forced by historical external forcing agents, sea surface temperature (SST) observations and sea ice (SIC) observations both with and without human influence. It was suggested that both the anthropogenic warming and an atmospheric circulation regime related to the natural variability of SST and SIC made the heat wave event more likely. On the other hand, no significant human influence was found in atmospheric circulation patterns. These results were robust for two different estimates of anthropogenic signals on SST and SIC.
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