NASA LaRC airborne high spectral resolution lidar aerosol measurements during MILAGRO: observations and validation

The NASA Langley Research Center (LaRC) air- borne High Spectral Resolution Lidar (HSRL) measures ver- tical profiles of aerosol extinction, backscatter, and depo- larization at both 532 nm and 1064 nm. In March of 2006 the HSRL participated in the Megacity Initiative: Local and Global Research Observations (MILAGRO) campaign along with several other suites of instruments deployed on both aircraft and ground based platforms. This paper presents high spatial and vertical resolution HSRL measurements of aerosol extinction and optical depth from MILAGRO and comparisons of those measurements with similar measure- ments from other sensors and model predictions. HSRL mea- surements coincident with airborne in situ aerosol scattering and absorption measurements from two different instrument suites on the C-130 and G-1 aircraft, airborne aerosol opti- cal depth (AOD) and extinction measurements from an air- borne tracking sunphotometer on the J-31 aircraft, and AOD from a network of ground based Aerosol Robotic Network (AERONET) sun photometers are presented as a validation of the HSRL aerosol extinction and optical depth products. Regarding the extinction validation, we find bias differences between HSRL and these instruments to be less than 3% (0.01 km 1 ) at 532 nm, the wavelength at which the HSRL technique is employed. The rms differences at 532 nm were less than 50% (0.015 km 1 ). To our knowledge this is the

[1]  P. Sprent,et al.  Query: The Geometric Mean Functional Relationship , 1980 .

[2]  F. G. Fernald.  Analysis of atmospheric lidar observations: some comments. , 1984, Applied optics.

[3]  J. Coakley,et al.  Climate Forcing by Anthropogenic Aerosols , 1992, Science.

[4]  E. Eloranta,et al.  Demonstration of a high-spectral-resolution lidar based on an iodine absorption filter. , 1994, Optics letters.

[5]  J. Spinhirne,et al.  Lidar aerosol backscatter cross sections in the 2-νm near-infrared wavelength region. , 1996, Applied optics.

[6]  A. Smirnov,et al.  AERONET-a federated instrument network and data archive for aerosol Characterization , 1998 .

[7]  V. Ramaswamy,et al.  Reply [to “Comments on ‘A limited‐area‐model case study of the effects of sub‐grid scale variations in relative humidity and cloud upon the direct radiative forcing of sulfate aerosol’”] , 1998 .

[8]  P. Bhartia,et al.  Derivation of aerosol properties from satellite measurements of backscattered ultraviolet radiation , 1998 .

[9]  Tami C. Bond,et al.  Calibration and Intercomparison of Filter-Based Measurements of Visible Light Absorption by Aerosols , 1999 .

[10]  T. Eck,et al.  An emerging ground-based aerosol climatology: Aerosol optical depth from AERONET , 2001 .

[11]  L. M. Caldwell,et al.  High-spectral-resolution lidar with iodine-vapor filters: measurement of atmospheric-state and aerosol profiles. , 2001, Applied optics.

[12]  S. Satheesh.  Aerosol radiative forcing over land: effect of surface and cloud reflection , 2002 .

[13]  Beat Schmid,et al.  Column closure studies of lower tropospheric aerosol and water vapor during ACE-Asia using airborne Sun photometer and airborne in situ and ship-based lidar measurements , 2003 .

[14]  Matthew J. McGill,et al.  Airborne Lidar Measurements of Aerosol Optical Properties During Safari-2000 , 2003 .

[15]  O. Dubovik,et al.  Clear‐column closure studies of aerosols and water vapor aboard the NCAR C‐130 during ACE‐Asia, 2001 , 2003 .

[16]  Georg A. Grell,et al.  Fully coupled “online” chemistry within the WRF model , 2005 .

[17]  H. Jäger.  Long‐term record of lidar observations of the stratospheric aerosol layer at Garmisch‐Partenkirchen , 2005 .

[18]  O. Dubovik,et al.  Variability of aerosol and spectral lidar and backscatter and extinction ratios of key aerosol types derived from selected Aerosol Robotic Network locations , 2005 .

[19]  P. Quinn,et al.  Modification, Calibration and a Field Test of an Instrument for Measuring Light Absorption by Particles , 2005 .

[20]  Alexander Smirnov,et al.  How well do State-of-the-Art Techniques Measuring the Vertical Profile of Tropospheric Aerosol Extinction Compare? , 2006 .

[21]  Nobuo Sugimoto,et al.  Characteristics of dust aerosols inferred from lidar depolarization measurements at two wavelengths. , 2006, Applied optics.

[22]  Beat Schmid,et al.  Evaluation of daytime measurements of aerosols and water vapor made by an operational Raman lidar over the Southern Great Plains , 2006 .

[23]  K. Powell,et al.  Estimating random errors due to shot noise in backscatter lidar observations. , 2006, Applied optics.

[24]  J. Barnard,et al.  © Author(s) 2007. This work is licensed under a Creative Commons License. Atmospheric Chemistry and Physics A meteorological overview of the MILAGRO field campaigns , 2007 .

[25]  Stefano Schiavon,et al.  Climate Change 2007: The Physical Science Basis. , 2007 .

[26]  J. Dutoit.  The Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) , 2007 .

[27]  D. Chu,et al.  Multi‐grid‐cell validation of satellite aerosol property retrievals in INTEX/ITCT/ICARTT 2004 , 2007 .

[28]  S. Ghan,et al.  Comments on “A limited‐area‐model case study of the effects of sub‐grid scale variations in relative humidity and cloud upon the direct radiative forcing of sulfate aerosol” , 2007 .

[29]  Wayne C. Welch,et al.  Airborne high spectral resolution lidar for profiling aerosol optical properties. , 2008, Applied optics.

[30]  Martijn Gough.  Climate change , 2009, Canadian Medical Association Journal.

[31]  Alexander Smirnov,et al.  Comparison of aerosol optical depths from the Ozone Monitoring Instrument (OMI) on Aura with results from airborne sunphotometry, other space and ground measurements during MILAGRO/INTEX-B , 2009 .

[32]  A. Weinheimer,et al.  Observations of heterogeneous reactions between Asian pollution and mineral dust over the Eastern North Pacific during INTEX-B , 2009 .

[33]  W. Landman.  Climate change 2007: the physical science basis , 2010 .

[34]  Philip B. Russell,et al.  An overview of the MILAGRO 2006 Campaign: Mexico City emissions and their transport and transformation , 2010 .