You are here: Home
/ Publication Information
Title: The interannual variability of the Haines Index over North America
Author: Yu, Lejiang; Zhong, Shiyuan; Bian, Xindi; Heilman, Warren E.; Charney, Joseph J.;
Source: Journal of Applied Meteorology and Climatology. 52(11): 2396-2409.
Publication Series: Scientific Journal (JRNL)
Description: The Haines index (HI) is a fire-weather index that is widely used as an indicator of the potential for dry, low-static-stability air in the lower atmosphere to contribute to erratic fire behavior or large fire growth. This study examines the interannual variability of HI over North America and its relationship to indicators of large-scale circulation anomalies. The results show that the first three HI empirical orthogonal function modes are related respectively to El Niño-Southern Oscillation (ENSO), the Arctic Oscillation (AO), and the interdecadal sea surface temperature variation over the tropical Pacific Ocean. During the negative ENSO phase, an anomalous ridge (trough) is evident over the western (eastern)United States, with warm/dry weather and more days with high HI values in the western and southeastern United States. During the negative phase of the AO, an anomalous trough is found over the western United States, with wet/cool weather and fewer days with high HI, while an anomalous ridge occurs over the southern United States-northern Mexico, with an increase in the number of days with high HI. After the early 1990s, the subtropical high over the eastern Pacific Ocean and the Bermuda high were strengthened by a wave train that was excited over the tropical western Pacific Ocean and resulted in warm/dry conditions over the southwestern United States and western Mexico and wet weather in the southeastern United States. The above conditions are reversed during the positive phase of ENSO andAO and before the early 1990s.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
XML: View XML
Yu, Lejiang; Zhong, Shiyuan; Bian, Xindi; Heilman, Warren E.; Charney, Joseph J. 2013. The interannual variability of the Haines Index over North America. Journal of Applied Meteorology and Climatology. 52(11): 2396-2409.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility