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Revisiting the Leading Drivers of Pacific Coastal Drought Variability in the Contiguous United States

Benjamin I. Cook; A. Park Williams; Richard Seager; Jason E. Smerdon; Deepti Singh

Title:
Revisiting the Leading Drivers of Pacific Coastal Drought Variability in the Contiguous United States
Author(s):
Cook, Benjamin I.
Williams, A. Park
Seager, Richard
Smerdon, Jason E.
Singh, Deepti
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Volume:
31
Persistent URL:
Book/Journal Title:
Journal of Climate
Geographic Area:
United States--Pacific Coast
Abstract:
Coastal droughts that simultaneously affect California, Oregon, and Washington are rare, but they have extensive and severe impacts (e.g., wildfire and agriculture). To better understand these events, historical observations are used to investigate 1) drought variability along the Pacific coast of the contiguous United States and 2) years when extreme drought affects the entire coast. The leading pattern of cold-season (October–March) precipitation variability along the Pacific coast favors spatially coherent moisture anomalies, accounting for >40% of the underlying variance, and is forced primarily by internal atmospheric dynamics. This contrasts with a much weaker dipole mode (~20% of precipitation variability) characterized by antiphased moisture anomalies across 40°N and strong correlations with tropical Pacific sea surface temperatures (SSTs). Sixteen coastal-wide summer droughts occurred from 1895 to 2016 (clustering in the 1920s–1930s and post-2000), events most strongly linked with the leading precipitation mode and internal atmospheric variability. The frequency of landfalling atmospheric rivers south of 40°N is sharply reduced during coastal droughts but not north of this boundary, where their frequency is more strongly influenced by the dipole. The lack of a consistent pattern of SST forcing during coastal droughts suggests little potential for skillful seasonal predictions. However, their tendency to cluster in time and the impact of warming during recent droughts may help inform decadal and longer-term drought risks.
Subject(s):
Droughts
Droughts--Environmental aspects
Drought forecasting
Climatic changes
Publisher DOI:
https://doi.org/10.1175/JCLI-D-17-0172.1
Item views
24
Metadata:
text | xml
Suggested Citation:
Benjamin I. Cook, A. Park Williams, Richard Seager, Jason E. Smerdon, Deepti Singh, , Revisiting the Leading Drivers of Pacific Coastal Drought Variability in the Contiguous United States, Columbia University Academic Commons, .

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