1. CREST Lidar Network (CLN)
CREST Lidar network (formally denoted as REALM) is comprised of lidar facilities at 4 US campuses partially supported by the NOAA CREST Cooperative Center
CCNY – New York City Area (Barry Gross / Fred Moshary)
UMBC- Baltimore Area (Ray Hoff)
Hampton U. – Virginia (Pat McCormick)
UPRM- Mayaguez Puerto Rico (Hamed Parsiani)
2nd Galion Workshop Sept 21, 2010 Geneva Switzerland

2. CCNY Lidar and ancillary Ground-based facilities
A multi-wavelength Raman-Mie lidar (1064,532,355,387,407-nm)
Vertical distribution of aerosol, cloud and water vapor,
Angstrom exponent, Lidar-ratio, PBL-height;
3-day/week in the urban area.
 A CIMEL sun-photometer (AERONET site co-located with the lidar)
Aerosol optical depth (AOD) at 340~1020nm channel, Angstrom exponent,
Inversion data (volume size distribution,refractive index).
Radiometrics Microwave Radiometer (~60-mile away, downwind direction)
Profiles of T, RH, PWV, LW to 10 km (50-200m resolution)

3. CCNY multi-wavelength Raman-Mie lidar
Three laser-beams: 1064/532/355-nm simutaneously
Five-receiving channels: 3 elastic + 2 Raman channels ( nm)
Laser power: Telescope: Φ50-cm
Regular obs., 3-day/week in the urban area.
Additional Goal: N2-Raman at 607-nm (2α+3β for aerosol microphysics). Data access from Earlinet Database can be used to test algorithms

4. Collection statistics Last 4 years
Based on > 6 Hours observation criteria
Obvious Increase in data collection in summer: FAA Req need Human Observers
Runs try to follow Galion MWTH schedule weather permitting

5. CCNY Lidar Sample Scientific Activities
Assessing Calipso Retrievals
Vertical Profiles
Aerosol Classification
PBL heights from Caliop Layer Product
Exploration of PBL Height Dynamics / Assessment of Urbanized Meteorological Models (i.e uWRF)

6. CALIPSO ground tracks near CCNY-lidar site

7. Testing Aerosol classification
Ground-based lidar observation
High Angstrom exponent
Aerosol plume
CALIOP/CALIPSO Obsevations of Alaska Fire Smoke Plumes
Cloud
Aerosol plume

8. Comparisons of WRF / uWRF Mixing Layer with CCNY Lidar
uWRF vs Lidar Mixing Height
See convective layer but
Residual layers not captured.
A trend is seen in summer convective cases where WRF seems to overestimate
and prematurely trigger convective growth. Overestimation of Turbulent
Kinetic Energy (TKE) by underestimating urban roughness scales.
uWRF overestimates the urban roughness

9. GALION Workshop Presentation
Profiling air pollution over Baltimore “A Baltimore Testbed or An Air Quality Proving Ground”
Ray Hoff Kevin McCann
Tim Berkoff Ruben Delgado
Hai Zhang Amy Huff (Battelle)
Patricia Sawamura Daniel Orozco
UMBC’s work in CLN has been supported both by CREST and by a major acquisition grant from NASA. The team members are shown on this slide.
September 21, 2010
GALION Workshop Presentation

10. Areas of Research
Understanding optical properties of atmospheric aerosols and gases in a suburban environment
Understanding satellite retrievals of these chemicals and the relationship between column and profile measurements
Calibrating the remote sensing measurements with in-situ ground measurements
Understanding the impact of aerosols on human health
Of specific interest here is providing a reference site within GALION for intercomparing commercial technologies that can be exported
UMBC’s interest are the five areas above, all are related to Air Quality in a suburban setting. Of interest here are the addition of lidars which are commercial and can be considered for wider GALION use (see next slide).

11. Before 2008 ALEX - UV N2, H2O Raman lidar - 355, 389, 407 nm
Before 2008, UMBC had an elastic lidar (ELF) which is shown on the left and a nitrogen-water vapor Raman lidar.
ALEX - UV N2, H2O Raman lidar - 355, 389, 407 nm
ELF - 532(,), 1064 elastic lidar

12. GALION needs QA/QC site for lidars in US
Have all the wavelengths that people might use routinely
Ability to cross-calibrate instruments
Decided to add MPL (532nm) and LEOSPHERE (355nm) with NASA support
As part of the NASA acquisition, a standard Sigmaspace MPL lidar and a Leosphere ALS450 were purchased and compared to the existing systems. Hoff will talk tomorrow about the use of the Leosphere.

13. New instruments BAM and TEOM (PM2.5 continuously)
TSI 3683 (3 nephelometer)
CIMEL (8 AOD, size distribution)
LICEL (new detector package for ALEX)
Additionally, UMBC purchase insitu instruments, a CIMEL sunphotometer and converted the ALEX system over to LICEL electronics from the old, old, old Santa Fe counting cards.

14. UMBC Monitoring of Atmospheric Pollution (UMAP) (NASA Supported Project)
Weblinks
to instruments
The NASA project was retitled UMAP (UMBC Monitoring of Atmospheric Pollution and the instrument links are shown on the site here.

15. Data available
The system is calendared and quicklooks can be seen by clicking on a date in green.

16. Sept. 2, 2009 Intercomparison Smoke Leosphere ELF
Quickly, here is a comparison between the 532 ELF system and Leosphere which qualitatively look similar. Note that the ELF system has a wavelet PBL height product. But…..
ELF

17. Leosphere - ELF Sept. 02, 2009 intercomparison
Sa = 56 sr-1
355 nm
532 nm
The Leosphere retrieval (blue left) has a different shape than the ELF retrieval. There are differences in the retrieve Sa from Leosphere’s Klett routing (73) and ELF’s closure on the CIMEL (Sa = 56). This led UMBC to develop an independent extinction retrieval on Leosphere which Ray Hoff will talk about tomorrow. ?
Note : Differences in Profile structure :
This led UMBC to develop an independent extinction retrieval on Leosphere
which Ray Hoff will talk about tomorrow

18. Hampton Lidar and Activities
48-inch lidar 0.355, 0.532, and µm.
These measurements are being used as correlative measurements for the CALIPSO Spacecraft lidar backscatter measurements at µm and µm.
Recently, the lidar was upgraded to obtain vibrational Raman backscattering measurements of tropospheric water vapor mixing ratios with two additional detectors at and µm.
Preliminary measurements indicate that the lidar can provide useful water vapor mixing ratios to about 12 km at night and 4 km during daytime.
CCNY, UMBC and Hampton Activities are increasing coordination

21. UPRM Lidar Activities Newest Implementation
Important location in capturing different aerosol types
Urban / Maritime mixing
Saharan Dust Plumes
Working on getting multwavelength system following CCNY Model

22. S Ratio based on closure with AOD from AERONET
AOD 532 =.21 (include AOD =.04 contribution
to account for non-overlap