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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.

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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.