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Great Plains Low-Level Jet Occurrence and Upper-Level Coupling in CERA-20C

| DOI: 10.5065/KDB5-9X72

The Great Plains Low-Level Jet Occurrence and Upper-Level Coupling CERA-20C dataset comprises a 3-hourly record of low-level jet activity and degree of upper-atmospheric jet stream coupling over the contiguous United States from 1901-2010 derived from CERA-20C following the objective dynamically-based methodology of Burrows et al. (2019). This dataset extends the work of Uccellini (1980) who first highlighted variations in the degree of coupling between low-level jets and upper-level flow using a visual weather map approach. The presence of an active low-level jet is first assessed according to the conventional Bonner (1968) low-level jet classification. Then, the local finite-amplitude wave activity index of Huang and Nakamura (2015) is applied to assess whether a detected jet is upper-level coupled (or not). This dataset is remarkable because understanding the degree of low-level (terrain) coupling for a particular low-level jet is instrumental in predicting whether regional land-atmosphere interactions may play a role in its evolution, and moreover, whether land data assimilation holds promise for improved predictability in such cases. The dataset includes the coupled/uncoupled classification, as well as u- and v-winds at 700 and 850 hPa from CERA-20C.

Temporal Range:
1901-05-01 00:00 +0000 to 2010-09-30 21:00 +0000
Upper Level Winds
Vertical Levels:
See the detailed metadata for level information.
Data Types:
Spatial Coverage:
Longitude Range: Westernmost=129.375W Easternmost=50.625W
Latitude Range: Southernmost=25.875N Northernmost=49.5N Detailed coverage information
Data Contributors:
Atmospheric Sciences Research Center, State University of New York, Albany
Burrows, D. A., C. R. Ferguson, M. A. Campbell, G. Xia, and L. F. Bosart, 2019: An Objective Classification and Analysis of Upper-Level Coupling to the Great Plains Low-Level Jet over the Twentieth Century J. Climate, 32, 7127-7152 (DOI: 10.1175/JCLI-D-18-0891.1).

Huang, C. S. Y., and N. Nakamura, 2016: Local Finite-Amplitude Wave Activity as a Diagnostic of Anomalous Weather Events J.Atmos.Sci., 73, 211-229.

Bonner, W. D., 1968: Climatology of the low level jet Mon. Weather Rev., 96, 833-850.

Total Volume:
5.05 GB
Data Formats:
More Details:
View a more detailed summary of the data, including specific date ranges and locations by parameter
Metadata Record:
Data License:
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