Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 5, Pages 954-958Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50184
Keywords
sub-annual paleoclimatology; season-specific climate variability
Categories
Funding
- NSF P2C2 [0823090]
- NOAA award [NA08OAR4310727]
- Environmental Protection Agency STAR award [FP917185]
- EPA [FP917185, 672893] Funding Source: Federal RePORTER
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [823090] Funding Source: National Science Foundation
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The North American monsoon is a major focus of modern and paleoclimate research, but relatively little is known about interannual- to decadal-scale monsoon moisture variability in the pre-instrumental era. This study draws from a new network of subannual tree-ring latewood width chronologies and presents a 470-year reconstruction of monsoon (JuneAugust) standardized precipitation for southwestern North America. Comparison with an independent reconstruction of cool-season (OctoberApril) standardized precipitation indicates that southwestern decadal droughts of the last five centuries were characterized not only by cool-season precipitation deficits but also by concurrent failure of the summer monsoon. Monsoon drought events identified in the past were more severe and persistent than any of the instrumental era. The relationship between winter and summer precipitation is weak, at best, and not time stable. Years with opposing-sign seasonal precipitation anomalies, as noted by other studies, were anomalously frequent during the mid to late 20th century.
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