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GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L23701,
doi:10.1029/2005GL023759,
2005
Effects of atmospheric teleconnections on seasonal precipitation in mountainous regions of the southwestern U.S.: A case study
in northern New Mexico
Huade Guan
Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Enrique R. Vivoni
Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
John L. Wilson
Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Abstract
This study uses instrument records and geostatistical modeling to examine hydrologically important temporal and spatial patterns
of seasonal precipitation associated with the El Niño-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO)
in a mountainous region of northern New Mexico. PDO is the more dominant factor, compared to ENSO, with a larger influence
on winter and spring precipitation (wetter for high PDO, drier for low PDO). Extreme ENSO effects are not significant during
the high PDO years, but during low PDO years El Niño strongly dampens winter and spring precipitation anomalies. Elevation
modulates ENSO and PDO effects on winter anomalies, but does not seem to for other seasons. For a wetter-than-normal winter,
the anomalies are larger at higher elevations, and are positive. For a drier-than-normal winter, the anomalies are larger
at lower elevations, and are negative. For neutral ENSO, summer precipitation is predictable but spatially variable, indicating
different local climates. High-resolution mapping brings out hydrologically important patterns of precipitation anomalies
that would otherwise be blurred by spatial averaging.
Received 8
June
2005;
accepted 14
October
2005;
published 1
December
2005.
Index Terms: 1637 Global Change: Regional climate change; 1655 Global Change: Water cycles (1836); 1854 Hydrology: Precipitation (3354); 3305 Atmospheric Processes: Climate change and variability (1616, 1635, 3309, 4215, 4513); 3329 Atmospheric Processes: Mesoscale meteorology.
Read Full Article (file size: 192434 bytes) Cited by
Citation: Guan, H., E. R. Vivoni, and J. L. Wilson
(2005),
Effects of atmospheric teleconnections on seasonal precipitation in mountainous regions of the southwestern U.S.: A case study
in northern New Mexico,
Geophys. Res. Lett.,
32,
L23701,
doi:10.1029/2005GL023759.
Copyright 2005 by the American Geophysical Union.
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