Trends in seasonal warm anomalies across the contiguous United States: Contributions from natural climate variability.

ABSTRACT: Many studies have shown the importance of anthropogenic greenhouse gas emissions in contributing to observed upward trends in the occurrences of temperature extremes over the U.S. However, few studies have investigated the contributions of internal variability in the climate system to these observed trends. Here we use daily maximum temperature time series from the North American Land Data Assimilation System Phase 2 (NLDAS-2) dataset to identify trends in seasonal warm anomalies over the contiguous U.S. in the three most recent decades and explore their relationships to low-frequency modes of internal climate variability. The results reveal substantial upward trends in the frequency of warm anomalies in all seasons and in all regions of the U.S., except for portions of the Intermountain W

SUBMITTER: Yu L 

PROVIDER: S-EPMC5821865 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature