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FIELD CAMPAIGNS - CALIPSO and Twilight Zone (CATZ) Ground-based Validation
 
 
Background
 

Between June 26 th and August 29 th of 2007, nine field campaigns were carried out in Virginia and Maryland as part of the CALIPSO And Twilight Zone (CATZ) experiment. The field work was conducted on an alternating basis between the two daytime ground tracks closest to the NASA Goddard Space Flight Center with four taking place in Virginia and five based on the eastern shore of Maryland.

Cimel sun photometers were positioned and operated within 150m of the CALIPSO ground track during satellite overpass. The number of Cimels deployed ranged from 3 to 11, and were generally run from early morning (to acquire low sun almucantars) until late afternoon. After the morning almucantars were completed, the Cimels were placed in the ‘Oneill mode’ which is configured to take direct sun measurements every 3 minutes instead of the standard interval of 15 minutes. During the hour before and after overpass, the Cimels were placed in ‘BCLSun’ mode which takes AOD measurements at the highest temporal resolution (1-min interval), and principal plane measurements were also initiated just before and after overpass, as well as periodically throughout the day whenever sky conditions were most suitable (cloud-free in the measurement viewpath).

In addition to the mobile Cimels, a permanent Cimel and Micropulse Lidar (MPL) were situated near Strasburg, PA ( 39.932 N,76.198W) close to the point where the CALIPSO day and night tracks intersected and these were operated continuously for the duration of the experiment. For several of the campaigns these measurements were supplemented by a mobile MPL (operated on the day track), as well as airborne lidar including the High Spectral Resolution Lidar (HSRL) [Chris Hostetler] and/or a Raman Airborne Spectroscopic Lidar (RASL) [Dave Whiteman]. The initial campaigns also included a small network of Microtops handheld sun photometers deployed around the mobile MPL location in order to evaluate the spatial homogeneity of the aerosol.

 
Objectives (Top)
 
  • Perform joint inversions using both ground based sky radiance measurements from Cimels and radiance measurements from CALIPSO. These enhanced retrievals should allow for the characterization of the vertical distribution of the particle size and perhaps absorption, as well as improve the accuracy of both aerosol and surface properties (using passive sensor data from PARASOL and MODIS).
  • Observe and investigate the nature of particles inhabiting the ‘twilight zone’ between cloud and aerosol particles, by making detailed measurements on the periphery of visible cloud boundaries.
  • Calculate lidar ratio from Version 2 almucantar data (SSA and phase function)
  • Establish a climatology of lidar ratio for all aerosol types using Version 2 data products
  • Validate the CALIPSO AOD product using lidar ratio derived in-situ from Cimels
 
Contacts (Top)
 
Collaborators
Project/Instrument Organization
Brent Holben
AERONET
NASA-GSFC
Chris Hostetler
HSRL
NASA-LARC
David Whiteman
RASL
NASA-GSFC
Tim Berkoff
MPLNET
NASA-GSFC
Qiang Jack Ji
SMART
NASA-GSFC
Lorraine Remer
MODIS
NASA-GSFC
 
Participant Data Links (Top)
 

+ CATZ AERONET AOD Data Browser

+ CATZ AERONET AOD Data Download Tool
Note: These AOD data may not adhere to AERONET operational cloud-screening procedures.

+ CATZ AERONET Inversion Data Browser

+ CATZ AERONET Inversion Data Download Tool

+ CALIPSO Data Sets

 
Data and Summaries (Top)
 
CATZ - A
June 26, 2007 PA-Delmarva
  CALIPSO Level 1 Browse Images  
  Summary Data
AERONET Sites:

Calipso_Brookview
Calipso_Ninetown_Rd

Calipso_Price
Calipso_Princess_An

Calipso_Prt_Deposit
Calipso_Strasburg
Calipso_West_Denton
 
CATZ - B
July 3, 2007 PA-Virginia
  CALIPSO Level 1 Browse Images  
  Summary Data
AERONET Sites:

Calipso_Ashburn
Calipso_Peckman_Frm

Calipso_Poplar_Tree
Calipso_Sterling_PO
 
CATZ - C
July 12, 2007 PA-Delmarva
  No CALIPSO Data Collected for Region  
  Summary Data
AERONET Sites:

Calipso_Bowers_Rd
Calipso_Harrison_Rd
Calipso_Kennedyvill
Calipso_Mardela_Spr
Calipso_NUFerry_Rd
Calipso_Perryville

Calipso_Pine_Cove
Calipso_Ridgely
Calipso_Williston_Lk
Calipso_WofDenton
Calipso_Zion
Additional Data Kennedyville Cimel Photos
Sassafras Microtops Photos
 
 
CATZ - D
July 19, 2007 PA-Virginia
  CALIPSO Level 1 Browse Images  
  Summary Data
AERONET Sites: Calipso_Braddock_Rd
Calipso_Fincastle
Calipso_Kinchaloe
Calipso_Zion
 
CATZ - E
July 28, 2007 PA-Delmarva
  No CALIPSO Data Collected for Region  
  Summary Data
AERONET Sites:

Calipso_Church_Hill
Calipso_Cooper_Rd
Calipso_Tuckahoe
Calipso_Washtn_High

Calipso_W_Mardela
Calipso_W_Strasburg
Calipso_Zion
 
CATZ - F
August 4, 2007
PA-Virginia
  CALIPSO Level 1 Browse Images  
  Summary Data
AERONET Sites: Calipso_Loudon_Rd
Calipso_Ormand_MS
Calipso_Sanders_ES
Calipso_Westfield_H
Calipso_Zion
 
CATZ - G
August 13, 2007 PA-Delmarva
  CALIPSO Level 1 Browse Images  
  Summary Data
AERONET Sites:

Calipso_Crouse_Mill
Calipso_Flat_Iron
Calipso_Hillsboro
Calipso_Hurlock

Calipso_Vienna
Calipso_White_Marsh
Calipso_Zion
 
CATZ - H
August 20, 2007 PA-Virginia
  CALIPSO Level 1 Browse Images  
  Summary Data
AERONET Sites:

Calipso_Signal_Hill
Calipso_Zion

 
 
CATZ - I
August 29, 2007 PA-Delmarva
  CALIPSO Level 1 Browse Images  
  Summary Data
AERONET Sites: Calipso_Church_H_Rd
Calipso_Dean_Rd
Calipso_Hillsboro_E
Calipso_Morgnec
Calipso_Zion
 

 

 

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NASA Official: Brent N. Holben
Last Updated: May 20, 2009