Terrain-Enhanced Precipitation Processes Above the Melting Layer: Results From OLYMPEX

Journal Article · 17 October 2018 · Journal of Geophysical Research: Atmospheres

DOI: https://doi.org/10.1029/2018JD029161 · OSTI ID:1483421

McMurdie, L. A.  ^[1]; Rowe, A. K.  ^[1]; Houze, Jr., R. A. ^[2]; Brodzik, S. R. ^[1]; Zagrodnik, J. P.  ^[1]; Schuldt, T. M. ^[3]

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1. Univ. of Washington, Seattle, WA (United States)
2. Univ. of Washington, Seattle, WA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
3. Univ. of Washington, Seattle, WA (United States); The Narwhal Group, Bellevue, WA (United States)

Here, the enhancement of precipitation processes aloft over complex terrain is documented using reflectivity data from an S–band scanning radar (NPOL) that was deployed on the west coast of Washington State during the Olympic Mountains Experiment (OLYMPEX). From November 2015 through mid–January 2016, NPOL obtained high–resolution data within sectors over the ocean and over the windward slopes of the Olympic Mountains. Contoured Frequency by Altitude Diagrams of radar reflectivity highlight a higher frequency of occurrence of larger reflectivities for all heights between 2 and 8 km over land compared to ocean, with the largest difference in the 4– to 6–km range indicating a robust signature of enhancement aloft over the windward slopes. This enhancement pattern is found to some degree under all environmental conditions considered but is especially pronounced during periods of high vapor transport, high melting level height, southwest low–level winds, and neutral stability. These conditions are generally associated with warm sectors of midlatitude cyclones and atmospheric rivers. Past studies have postulated that a secondary enhancement in reflectivity aloft was an intrinsic part of atmospheric river type systems. However, these results show that further significant enhancement of this signature occurs as deep moist–neutral, high water vapor content flow is lifted when it encounters a mountain range. Reflectivity data from the dual–precipitation radar aboard the Global Precipitation Measurement satellite also documents this reflectivity increase aloft over the Olympic Mountains compared to the adjacent ocean, showing the potential for Global Precipitation Measurement to provide reliable estimates of precipitation structure over remote mountainous regions.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-76RL01830
• OSTI ID: 1483421
• Journal Information: Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 21 Vol. 123; ISSN 2169-897X
• Publisher: American Geophysical UnionCopyright Statement
• Country of Publication: United States
• Language: English