Development of a Ground Based Remote Sensing Approach for Direct Evaluation of Aerosol-Cloud Interaction

The possible interaction and modification of cloud properties due to aerosols is one of the most poorly understood mechanisms within climate studies, resulting in the most significant uncertainty as regards radiation budgeting. In this study, we explore direct ground based remote sensing methods to assess the Aerosol-Cloud Indirect Effect directly, as space-borne retrievals are not directly suitable for simultaneous aerosol/cloud retrievals. To illustrate some of these difficulties, a statistical assessment of existing multispectral imagers on geostationary (e.g., GOES)/Moderate Resolution Imaging Spectroradiometer (MODIS) satellite retrievals of the Cloud Droplet Effective Radius (Reff) showed significant biases especially at larger solar zenith angles, further motivating the use of ground based remote sensing approaches. In particular, we discuss the potential of using a combined Microwave Radiometer (MWR)—Multi-Filter Rotating Shadowband Radiometer (MFRSR) system for real-time monitoring of Cloud Optical Depth (COD) and Cloud Droplet Effective Radius (Reff), which are combined with aerosol vertical properties from an aerosol lidar. An iterative approach combining the simultaneous observations from MFRSR and MWR are used to retrieve the COD and Reff for thick cloud cases and are extensively validated using the DoE Southern Great Plains (SGP) retrievals as well as regression based parameterized model retrievals. In addition, we account for uncertainties in background aerosol, surface albedo and the combined measurement uncertainties from the MWR and MFRSR in order to provide realistic uncertainty estimates, which is found to be ~10% for the parameter range of interest in Aerosol-Cloud Interactions. Finally, we analyze a particular case of possible aerosol-cloud interaction described in the literature at the SGP site and demonstrate that aerosol properties obtained at the surface can lead to inconclusive results in comparison to lidar-derived aerosol properties near the cloud base.

[1]  G. Feingold,et al.  The scale problem in quantifying aerosol indirect effects , 2011 .

[2]  P. Hobbs,et al.  Long-range transport of continental aerosols over the Atlantic Ocean and their effects on cloud structures , 1995 .

[3]  W. Paul Menzel,et al.  The MODIS cloud products: algorithms and examples from Terra , 2003, IEEE Trans. Geosci. Remote. Sens..

[4]  K. Stamnes,et al.  Estimations of Cloud Optical Thickness from Ground-Based Measurements of Incoming Solar Radiation in the Arctic , 1994 .

[5]  J. Michalsky,et al.  Objective algorithms for the retrieval of optical depths from ground-based measurements. , 1994, Applied optics.

[6]  S. Twomey.  The Influence of Pollution on the Shortwave Albedo of Clouds , 1977 .

[7]  Shepard A. Clough,et al.  An assessment of microwave absorption models and retrievals of cloud liquid water using clear‐sky data , 2003 .

[8]  T. Storelvmo,et al.  Combined observational and modeling based study of the aerosol indirect effect , 2006 .

[9]  A. Slingo,et al.  Aircraft observations of marine stratocumulus during JASIN , 1982 .

[10]  M. King,et al.  Cloud Retrieval Algorithms for MODIS : Optical Thickness , Effective Particle Radius , and Thermodynamic Phase , 2000 .

[11]  Brian Cairns,et al.  Automated cloud screening algorithm for MFRSR data , 2004 .

[12]  Ed R. Westwater,et al.  The accuracy of water vapor and cloud liquid determination by dual‐frequency ground‐based microwave radiometry , 1978 .

[13]  Sergey Y. Matrosov,et al.  Analysis of integrated cloud liquid and precipitable water vapor retrievals from microwave radiometers during the Surface Heat Budget of the Arctic Ocean project , 2001 .

[14]  Robert F. Cahalan,et al.  The albedo of fractal stratocumulus clouds , 1994 .

[15]  L. Riihimaki,et al.  Cloud Optical Properties from the Multifilter Shadowband Radiometer (MFRSRCLDOD). An ARM Value-Added Product , 2014 .

[16]  Susanne Crewell,et al.  Accuracy of cloud liquid water path from ground‐based microwave radiometry 1. Dependency on cloud model statistics , 2003 .

[17]  Qingyuan Han,et al.  Three Different Behaviors of Liquid Water Path of Water Clouds in Aerosol-Cloud Interactions , 2002 .

[18]  J. Michalsky,et al.  Automated multifilter rotating shadow-band radiometer: an instrument for optical depth and radiation measurements. , 1994, Applied optics.

[19]  Patrick Minnis,et al.  Parameterizations of reflectance and effective emittance for satellite remote sensing of cloud properties , 1998 .

[20]  David P. Kratz,et al.  Clouds and the Earth's Radiant Energy System (CERES) Algorithm Theoretical Basis Document , 1997 .

[21]  Catherine Gautier,et al.  SBDART: A Research and Teaching Software Tool for Plane-Parallel Radiative Transfer in the Earth's Atmosphere. , 1998 .

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

[23]  Domenico Solimini,et al.  Performance analysis of a multifrequency radiometer for predicting atmospheric propagation parameters , 1993 .

[24]  Yoram J. Kaufman,et al.  Analysis of smoke impact on clouds in Brazilian biomass burning regions: An extension of Twomey's approach , 2001 .

[25]  J. C. Liljegren,et al.  Measurements of integrated water vapor and cloud liquid water from microwave radiometers at the DOE ARM Cloud and Radiation Testbed in the U.S. southern Great Plains , 1996, IGARSS '96. 1996 International Geoscience and Remote Sensing Symposium.

[26]  J. Curry.  Interactions among Turbulence, Radiation and Microphysics in Arctic Stratus Clouds , 1986 .

[27]  Peter Pilewskie,et al.  Microphysical and radiative properties of boundary layer stratiform clouds deduced from ground‐based measurements , 1997 .

[28]  Josep Calbó,et al.  A Simple Method to Retrieve Cloud Properties from Atmospheric Transmittance and Liquid Water Column Measurements , 2011 .

[29]  Qilong Min,et al.  Cloud properties derived from surface MFRSR measurements and comparison with GOES results at the ARM SGP Site , 1996 .

[30]  Graeme L. Stephens,et al.  Aircraft Observations of the Radiative and Microphysical Properties of Stratocumulus and Cumulus Cloud Fields , 1987 .

[31]  J. B. Snider,et al.  Ground-based radiometric observations of atmospheric emission and attenuation at 20.6, 31.65, and 90.0 GHz: a comparison of measurements and theory , 1990 .

[32]  H. Jonsson,et al.  A simple relationship between cloud drop number concentration and precursor aerosol concentration for the regions of Earth's large marine stratocumulus decks , 2011 .

[33]  Brian Cairns,et al.  Remote Sensing of Atmospheric Aerosols and Trace Gases by Means of Multifilter Rotating Shadowband Radiometer. Part I: Retrieval Algorithm , 2002 .

[34]  Robert F. Cahalan,et al.  The Landsat Scale Break in Stratocumulus as a Three-Dimensional Radiative Transfer Effect: Implications for Cloud Remote Sensing , 1997 .

[35]  R. Pincus,et al.  Uncertainty in Cloud Optical Depth Estimates Made from Satellite Radiance Measurements. , 1995 .

[36]  S. Nicholls,et al.  An observational study of the structure of stratiform cloud sheets: Part II. Entrainment , 1986 .

[37]  Patrick Minnis,et al.  NASA-Langley web-based operational real-time cloud retrieval products from geostationary satellites , 2006, SPIE Asia-Pacific Remote Sensing.

[38]  Beat Schmid,et al.  Retrieval of optical depth and particle size distribution of tropospheric and stratospheric aerosols by means of Sun photometry , 1997, IEEE Trans. Geosci. Remote. Sens..

[39]  J. Hansen,et al.  Light scattering in planetary atmospheres , 1974 .

[40]  Sunny Sun-Mack,et al.  CERES Edition-2 Cloud Property Retrievals Using TRMM VIRS and Terra and Aqua MODIS Data—Part I: Algorithms , 2011, IEEE Transactions on Geoscience and Remote Sensing.

[41]  Yoram J. Kaufman,et al.  Aerosol-cloud interaction inferred from MODIS satellite data and global aerosol models , 2006 .

[42]  Q. Min,et al.  An assessment of aerosol-cloud interactions in marine stratus clouds based on surface remote sensing , 2009 .

[43]  Byung-Gon Kim,et al.  Effective radius of cloud droplets by ground‐based remote sensing: Relationship to aerosol , 2003 .

[44]  Patrick Minnis,et al.  CERES cloud property retrievals from imagers on TRMM, Terra, and Aqua , 2004, SPIE Remote Sensing.

[45]  G. Feingold,et al.  Quantifying error in the radiative forcing of the first aerosol indirect effect , 2008 .

[46]  V. R. Noonkester,et al.  Droplet Spectra Observed in Marine Stratus Cloud Layers , 1984 .

[47]  Susanne Crewell,et al.  Accuracy of cloud liquid water path from ground‐based microwave radiometry 2. Sensor accuracy and synergy , 2003 .

[48]  C. Mallet,et al.  Influence of cloud temperature on brightness temperature and consequences for water retrieval , 1998 .

[49]  Dana E. Veron,et al.  First measurements of the Twomey indirect effect using ground‐based remote sensors , 2003 .

[50]  Jong‐Jin Baik,et al.  Theoretical Studies of Convectively Forced Mesoscale Flows in Three Dimensions. Part I: Uniform Basic-State Flow , 2009 .

[51]  S. Nicholls,et al.  An observational study of the structure of stratiform cloud sheets: Part I. Structure , 1986 .

[52]  Taneil Uttal,et al.  On cloud radar and microwave radiometer measurements of stratus cloud liquid water profiles , 1998 .

[53]  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 .

[54]  Patrick Minnis,et al.  Cirrus layer microphysical properties derived from surface-based millimeter radar and infrared interferometer data , 1998 .

[55]  S. Biggar,et al.  Evaluation of the Applicability of Solar and Lamp Radiometric Calibrations of a Precision Sun Photometer Operating Between 300 and 1025 nm. , 1998, Applied optics.

[56]  Lorraine A. Remer,et al.  Aerosol-cloud interaction determined by both in situ and satellite data over a northern high-latitude site , 2009 .

[57]  Qilong Min,et al.  An adjoint formulation of the radiative transfer method , 1996 .

[58]  K. Stamnes,et al.  Numerically stable algorithm for discrete-ordinate-method radiative transfer in multiple scattering and emitting layered media. , 1988, Applied optics.