Scale-Dependent Relationships Between U.S. Temperatures and Teleconnections

Temperature patterns in the United States have been linked to numerous teleconnections, including the North Atlantic Oscillation (NAO), the Pacific�North American (PNA) pattern, the El Ni�o�Southern Oscillation (ENSO), the Madden�Julian Oscillation, and the West Pacific Oscillation (WPO). However, the relative influence of these teleconnections likely changes with the time scale of interest. For example, ENSO plays a bigger role on seasonal scales, while the MJO has a greater effect on intraseasonal scales. This study uses a new preliminary dataset of daily statewide temperature anomalies based on the Global Historical Climate Network (GHCN-Daily) to investigate these relationships. Simple time averaging of the temperature data will isolate temperature anomalies that are either intraseasonal (5�40 days) or seasonal (> 40 days). Preliminary results suggest that the MJO and the WPO are the leading drivers of U.S. temperatures on the intraseasonal scale.