Megan Chaplin UW Department of Atmospheric Sciences Pacific Northwest Weather Workshop March 4, 2016 Orographic enhancement of precipitation as observed.

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Presentation transcript:

Megan Chaplin UW Department of Atmospheric Sciences Pacific Northwest Weather Workshop March 4, 2016 Orographic enhancement of precipitation as observed by a DOW X-band radar during the OLYMPEX field campaign ACKNOWLEDGEMENTS: NASA grants NNX13AG71G, NNX15AL38G, and NNX16AD75G and NSF grant AGS

DOPPLER ON WHEELS (DOW) LOCATION: Lake Quinault valley DOW will obtain duel-polarization data in Quinault Valley below the beam of the NPOL radar PURPOSE: Understand low-level flow Orographic effects on precipitation

OROGRAPHIC EFFECTS LIFTING  ADIABATIC COOLING  CONDENSATION/PRECIPITATION Garvert et al. (2007) Medina et al. (2007)

AIRFLOW IN QUINAULT VALLEY COMMON DURING OLYMPEX: CAUSED BY: Cold air exiting valley OR forced by large-scale pressure gradients Down-valley, low-level flow Up-valley, upper-level flow 11/13/15 Enhanced prefrontal precipitation 12/01/15 Weak front with extensive stratiform precipitation 01/06/16 Disorganized band of precipitation DOW

KELVIN-HELMHOLTZ WAVES OPPOSING AIR FLOWS STRONG UP-VALLEY WEAKER DOWN VALLEY SHEAR LAYER Photo credit: Ali Gingrey

CASE STUDY: December 5-6 Broad Frontal Cloud System with Strong Wind Shear

FLOW PATTERN Down-valley flow at low levels Up-valley flow at upper levels  STRONG SHEAR LAYER  KH Waves  RADIAL VELOCITY: direction of particles from radar (blue – toward; red – away) DOW

PRECIPITATION INTENSITY ENHANCEMENT IN SHEAR LAYER AND AT TERRAIN  RADAR REFLECTIVITY: used to estimate precipitation intensity DOW

MICROPHYSICAL EVOLUTION MODIFICATION OF MELTING LEVEL  CORRELATION COEFFICIENT: measure of similarity between horizontal/vertical pulses within volume DOW

MICROPHYSICAL EVOLUTION  DIFFERENTIAL REFLECTIVITY: ratio of reflected horizontal and vertical power returns, depends on median shape/size of droplets MODIFICATION OF MELTING LEVEL due to SHEAR LAYER and TERRAIN DOW

SUMMARY Better understanding of LOW-LEVEL FLOW Orographic enhancement of precipitation Impact of shear layer on microphysics Further research in microphysical and dynamical processes associated with winter storms and interactions with WA coast and mountains

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