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NCAR Enhanced Boundary Layer Integrated Sounding System (EBLISS) Observations for VTMX. William Brown, Stephen Cohn , James Pinto, & David Parsons. National Center for Atmospheric Research (NCAR) Atmospheric Technology Division (ATD).

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ncar enhanced boundary layer integrated sounding system ebliss observations for vtmx

NCAR Enhanced Boundary Layer Integrated Sounding System (EBLISS) Observations for VTMX

William Brown, Stephen Cohn, James Pinto, & David Parsons

National Center for Atmospheric Research (NCAR) Atmospheric Technology Division (ATD)

6th Symposium on Integrated Observing Systems, Orlando, FL, January 2002

the salt lake valley complex flows in complex terrain
The Salt Lake ValleyComplex Flows in Complex Terrain
  • Lake breezes
  • Blocking by Wasatch
  • Canyon drainage flows
  • Upstream orography
  • Terrain induced eddies and convergence zones

Great Salt Lake

Wasatch Range

* NCAR site

Utah lake

slide3
VTMX

Vertical Transport and MiXing Program

  • DOE Funded (Lead: Chris Doran PNNL)
  • Study stable stratified conditions in urban basins
  • Development of stable layers, intermittent turb., morning/evening bdy layer transitions
  • Also goal of advancing measurement systems
  • 14 Groups including DOE, NOAA, NCAR, Univs.
  • Nine field sites throughout the Salt Lake City Valley
  • 6 Wind Profilers, 3 lidars, 200 soundings, aircraft, 6 tether-sondes, sodars, sfc met, and tracer releases
iss instruments
ISS Instruments
  • Southern Valley Site
  • MAPR – wind profiler
  • Surface stations
  • Rawinsondes (GPS)
iss enhancements taos sabl sodar
ISS Enhancements: TAOS, SABL, SODAR

TAOS

Up to 8 levels

wind, P, T, RH

Metek SODAR

winds to ~350 m

SABL

backscatter lidar

oct 3 weak northerly disturbance
Oct. 3: Weak Northerly Disturbance

SABL:Scanning Aerosol Backscatter Lidar

Useful for observing stable layer behavior

Could see sudden disturbances on clear nights

Rapid increase in aerosol height

oct 3 weak northerly disturbance1
Oct. 3: Weak Northerly Disturbance

Sounding

Oct 3, 7:02 UT

Sounding shows cool northerly below 500 m Other observations indicate effect is enhanced by narrowing of valley.

oct 3 weak northerly disturbance2
Oct. 3: Weak Northerly Disturbance

TAOS

Tethered Atmospheric Observing System

5 Sensor packages

Initially, Low levels from S, Upper levels N

Shallow northerly surge at 05:37 as disturbance arrives. See 200 m (black) winds.

oct 3 weak northerly disturbance3
Oct. 3: Weak Northerly Disturbance

SODAR

Metek DSDPA.90-24 mini-sodar

Winds similar to TAOS

Vertical motion assoc with disturbance.

Increased reflectivity with disturbed flow mixing.

oct 8 wave activity
Oct. 8: Wave activity

SODAR

Oscillations in SODAR reflectivity & vertical velocity

We often saw waves as the lake breeze (northerly) flow developed.

(Soundings and other observations verify lake breeze)

oct 8 wave activity1
Oct. 8: Wave activity

SABL

The lidar also sees waves in aerosol layers.

Some mixing(not dramatic).

oct 7 gap flow
Oct. 7: Gap Flow

The SODAR often shows shallow southerly surges overnight.

Note the stronger winds (purple) beginning at 7 Z.

oct 7 gap flow1
Oct. 7: Gap Flow

Sequence of temperature profiles shows cold air and mixing to 300 m.

0900

0700

0500 UTC

oct 7 gap flow2
Oct. 7: Gap Flow

MM5:Model Analysis

NCAR

*

oct 7 gap flow3
Oct. 7: Gap Flow

MM5 Simulated Low Level Winds

Valid 0300 UTC

Valid 0900 UTC

*

*

(MM5 simulates northerly surge but overestimates its duration and depthand does not capture intermittency)

conclusions
Conclusions

At VTMX we integrated multiple new sensors into the ISS TAOS and hilltop sfc sensors for low altitudes SODAR (Metek) for low level winds SABL to observe aerosol mixing We are using a mesoscale model for spatial coverage

This suite was much more capable than a standard ISS alone.

Examples of Observations Include: Stable layer disruption and mixing by weak disturbance Weak mixing induced by wave activity Frequent gap flow from a basin to the south Lake breeze effects from the north