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Title: Black carbon-induced snow albedo reduction over the Tibetan Plateau: uncertainties from snow grain shape and aerosol–snow mixing state based on an updated SNICAR model

Journal Article · · Atmospheric Chemistry and Physics (Online)
ORCiD logo [1];  [2];  [3];  [1];  [4];  [5]; ORCiD logo [6]; ORCiD logo [7]
  1. National Center for Atmospheric Research, Boulder, CO (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. National Center for Atmospheric Research, Boulder, CO (United States); Chinese Academy of Meteorological Sciences, Beijing (China)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Chinese Academy of Sciences, Lanzhou (China); CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing (China)
  6. Max Planck Inst. for Chemistry, Mainz (Germany)
  7. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

We implement a set of new parameterizations into the widely used Snow, Ice, and Aerosol Radiative (SNICAR) model to account for effects of snow grain shape (spherical vs. nonspherical) and black carbon (BC)–snow mixing state (external vs. internal). We find that nonspherical snow grains lead to higher pure albedo but weaker BC-induced albedo reductions relative to spherical snow grains, while BC–snow internal mixing significantly enhances albedo reductions relative to external mixing. The combination of snow nonsphericity and internal mixing suggests an important interactive effect on BC-induced albedo reduction. Comparisons with observations of clean and BC-contaminated snow albedo show that model simulations accounting for both snow nonsphericity and BC–snow internal mixing perform better than those using the common assumption of spherical snow grains and external mixing. We further apply the updated SNICAR model with comprehensive in situ measurements of BC concentrations in the Tibetan Plateau snowpack to quantify the present-day (2000–2015) BC-induced snow albedo effects from a regional and seasonal perspective. The BC concentrations show distinct and substantial sub-regional and seasonal variations, with higher values in the non-monsoon season and low altitudes. As a result, the BC-induced regional mean snow albedo reductions and surface radiative effects vary by up to an order of magnitude across different sub-regions and seasons, with values of 0.7–30.7 and 1.4–58.4 W m-2 for BC externally mixed with fresh and aged snow spheres, respectively. The BC radiative effects are further complicated by uncertainty in snow grain shape and BC–snow mixing state. BC–snow internal mixing enhances the mean albedo effects over the plateau by 30–60 % relative to external mixing, while nonspherical snow grains decrease the mean albedo effects by up to 31 % relative to spherical grains. Based on this study, extensive measurements and improved model characterization of snow grain shape and aerosol–snow mixing state are urgently needed in order to precisely evaluate BC–snow albedo effects.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1508123
Report Number(s):
PNNL-SA-137623
Journal Information:
Atmospheric Chemistry and Physics (Online), Vol. 18, Issue 15; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

References (92)

End of the Little Ice Age in the Alps forced by industrial black carbon journal September 2013
Origin and radiative forcing of black carbon transported to the Himalayas and Tibetan Plateau journal January 2011
Climate response of fossil fuel and biofuel soot, accounting for soot's feedback to snow and sea ice albedo and emissivity: SOOT CLIMATE EFFECTS THROUGH SNOW/ICE journal November 2004
Snow metamorphism as revealed by scanning electron microscopy: Snow Metamorphism as Revealed by SEM journal August 2003
Observations and model simulations of snow albedo reduction in seasonal snow due to insoluble light-absorbing particles during 2014 Chinese survey journal January 2017
Simulation of particle size distribution with a global aerosol model: contribution of nucleation to aerosol and CCN number concentrations journal January 2009
The Effects of Mountains on the General Circulation of the Atmosphere as Identified by Numerical Experiments journal January 1974
Light absorption and scattering by aggregates: Application to black carbon and snow grains journal July 2011
Rapid calculation of radiative heating rates and photodissociation rates in inhomogeneous multiple scattering atmospheres journal January 1989
Black soot and the survival of Tibetan glaciers journal December 2009
Springtime warming and reduced snow cover from carbonaceous particles journal January 2009
Black carbon in snow in the upper Himalayan Khumbu Valley, Nepal: observations and modeling of the impact on snow albedo, melting, and radiative forcing journal January 2015
Carbonaceous aerosols recorded in a southeastern Tibetan glacier: analysis of temporal variations and model estimates of sources and radiative forcing journal January 2015
Simulation of carbonaceous aerosols over the Third Pole and adjacent regions: distribution, transportation, deposition, and climatic effects journal February 2015
Light Absorption by Carbonaceous Particles: An Investigative Review journal January 2006
Carbon black vs. black carbon and other airborne materials containing elemental carbon: Physical and chemical distinctions journal October 2013
Bounding the role of black carbon in the climate system: A scientific assessment: BLACK CARBON IN THE CLIMATE SYSTEM journal June 2013
A New Parameterization of an Asymmetry Factor of Cirrus Clouds for Climate Models journal November 2007
Daily evolution in dust and black carbon content, snow grain size, and snow albedo during snowmelt, Rocky Mountains, Colorado journal December 2016
Light-absorbing impurities enhance glacier albedo reduction in the southeastern Tibetan plateau: Light-Absorbing Impurities in Snow journal July 2017
Modulation of snow reflectance and snowmelt from Central Asian glaciers by anthropogenic black carbon journal January 2017
Light-absorbing impurities accelerate glacier melt in the Central Tibetan Plateau journal June 2017
Stochastic parameterization for light absorption by internally mixed BC/dust in snow grains for application to climate models: ABSORPTION BY BC IN SNOW journal June 2014
Representation of a nonspherical ice particle by a collection of independent spheres for scattering and absorption of radiation: 3. Hollow columns and plates journal January 2005
Effect of Snow Grain Shape on Snow Albedo journal September 2016
The decreasing albedo of the Zhadang glacier on western Nyainqentanglha and the role of light-absorbing impurities journal January 2014
A Model for the Spectral Albedo of Snow. II: Snow Containing Atmospheric Aerosols journal December 1980
A global 3-D CTM evaluation of black carbon in the Tibetan Plateau journal January 2014
Distribution of light-absorbing impurities in snow of glacier on Mt. Yulong, southeastern Tibetan Plateau journal November 2017
Retention and radiative forcing of black carbon in eastern Sierra Nevada snow journal January 2013
Light-absorbing impurities in a southern Tibetan Plateau glacier: Variations and potential impact on snow albedo and radiative forcing journal February 2018
Black carbon and other light-absorbing impurities in snow across Northern China: LIGHT-ABSORBING IMPURITIES IN SNOW journal February 2013
A novel back-trajectory analysis of the origin of black carbon transported to the Himalayas and Tibetan Plateau during 1996-2010: ORIGIN OF BLACK CARBON ON THE THIRD POLE journal January 2012
Impact of disturbed desert soils on duration of mountain snow cover journal January 2007
A sensitivity study on modeling black carbon in snow and its radiative forcing over the Arctic and Northern China journal May 2014
Assessing Snow Albedo Feedback in Simulated Climate Change journal June 2006
Optical constants of ice from the ultraviolet to the microwave: A revised compilation journal January 2008
A controlled snowmaking experiment testing the relation between black carbon content and reduction of snow albedo journal January 2011
Review of climate and cryospheric change in the Tibetan Plateau journal January 2010
Spectral albedo of seasonal snow during intensive melt period at Sodankylä, beyond the Arctic Circle journal January 2013
Spectral reflectance of solar light from dirty snow: a simple theoretical model and its validation journal January 2013
Effects of soot-induced snow albedo change on snowpack and hydrological cycle in western United States based on Weather Research and Forecasting chemistry and regional climate simulations journal January 2009
Impact of impurities and cryoconite on the optical properties of the Morteratsch Glacier (Swiss Alps) journal January 2017
Climate effect of black carbon aerosol in a Tibetan Plateau glacier journal June 2015
Black carbon and mineral dust in snow cover on the Tibetan Plateau journal January 2018
Soot climate forcing via snow and ice albedos journal December 2003
Climate Change Will Affect the Asian Water Towers journal June 2010
Simulating black carbon and dust and their radiative forcing in seasonal snow: a case study over North China with field campaign measurements journal January 2014
Global and regional climate changes due to black carbon journal March 2008
Effects of snow grain shape on climate simulations: sensitivity tests with the Norwegian Earth System Model journal January 2017
Black-carbon reduction of snow albedo journal March 2012
Sensitivity studies on the impacts of Tibetan Plateau snowpack pollution on the Asian hydrological cycle and monsoon climate journal January 2011
Sources of black carbon to the Himalayan–Tibetan Plateau glaciers journal August 2016
Resolving Size Distribution of Black Carbon Internally Mixed With Snow: Impact on Snow Optical Properties and Albedo journal March 2018
Black carbon record based on a shallow Himalayan ice core and its climatic implications journal January 2008
20th-Century Industrial Black Carbon Emissions Altered Arctic Climate Forcing journal September 2007
An overview of black carbon deposition in High Asia glaciers and its impacts on radiation balance journal May 2013
Impact of Snow Grain Shape and Black Carbon–Snow Internal Mixing on Snow Optical Properties: Parameterizations for Climate Models journal December 2017
Modeling of Scattering and Absorption by Nonspherical Cirrus Ice Particles at Thermal Infrared Wavelengths journal August 1999
Present-day climate forcing and response from black carbon in snow journal January 2007
Emissions of primary aerosol and precursor gases in the years 2000 and 1750 prescribed data-sets for AeroCom journal January 2006
Snow Cover Distribution, Variability, and Response to Climate Change in Western China journal May 2006
Monotone Piecewise Cubic Interpolation journal April 1980
Scattering optics of snow journal January 2004
Third Pole Environment (TPE) journal July 2012
Impact of absorbing aerosol deposition on snow albedo reduction over the southern Tibetan plateau based on satellite observations journal July 2016
Intercomparison of the GOS approach, superposition T-matrix method, and laboratory measurements for black carbon optical properties during aging journal November 2016
Refinement of the ice absorption spectrum in the visible using radiance profile measurements in Antarctic snow journal January 2016
Physically based snow albedo model for calculating broadband albedos and the solar heating profile in snowpack for general circulation models journal January 2011
Enhanced solar energy absorption by internally-mixed black carbon in snow grains journal January 2012
Modeling the Origin of Anthropogenic Black Carbon and Its Climatic Effect Over the Tibetan Plateau and Surrounding Regions: Modeling BC Origin in the Tibet Plateau journal January 2018
Reflection of solar radiation by the Antarctic snow surface at ultraviolet, visible, and near-infrared wavelengths journal January 1994
Variation of the radiative properties during black carbon aging: theoretical and experimental intercomparison journal January 2015
Characteristics of black carbon in snow from Laohugou No. 12 glacier on the northern Tibetan Plateau journal December 2017
Black carbon radiative forcing over the Tibetan Plateau: BC radiative forcing in Tibetan Plateau journal November 2014
Close packing effects on clean and dirty snow albedo and associated climatic implications: CLOSE PACKING EFFECTS ON SNOW ALBEDO journal April 2017
Estimated impact of black carbon deposition during pre-monsoon season from Nepal Climate Observatory – Pyramid data and snow albedo changes over Himalayan glaciers journal January 2010
Quantifying sources, transport, deposition, and radiative forcing of black carbon over the Himalayas and Tibetan Plateau journal January 2015
In situ observations of black carbon in snow and the corresponding spectral surface albedo reduction: Black carbon and albedo in snow journal February 2015
Impact of Grain Shape and Multiple Black Carbon Internal Mixing on Snow Albedo: Parameterization and Radiative Effect Analysis journal January 2018
Black carbon aerosols and the third polar ice cap journal January 2010
Effects of snow physical parameters on shortwave broadband albedos journal January 2003
Black Carbon (BC) in the snow of glaciers in west China and its potential effects on albedos journal March 2009
Light-absorbing particles in snow and ice: Measurement and modeling of climatic and hydrological impact journal November 2014
Impacts of aerosols on seasonal precipitation and snowpack in California based on convection-permitting WRF-Chem simulations journal January 2018
Measurements of light-absorbing particles in snow across the Arctic, North America, and China: Effects on surface albedo: Effect of Observed BC on Surface Albedo journal October 2017
Springtime warming and reduced snow cover from carbonaceous particles journal January 2008
Retention and radiative forcing of black carbon in Eastern Sierra Nevada snow journal January 2012
Modulation of snow reflectance and snowmelt from Central Asian glaciers by anthropogenic black carbon text January 2017
Black carbon and mineral dust in snow cover on the Tibetan Plateau text January 2018
Light Scattering by Ice Crystals journal September 1969
Quantifying sources, transport, deposition and radiative forcing of black carbon over the Himalayas and Tibetan Plateau journal January 2015

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Enhanced Snow Absorption and Albedo Reduction by Dust‐Snow Internal Mixing: Modeling and Parameterization journal November 2019
A Review of the Representation of Aerosol Mixing State in Atmospheric Models journal March 2019
Radiative feedbacks of dust in snow over eastern Asia in CAM4-BAM journal January 2018
Impact of light-absorbing particles on snow albedo darkening and associated radiative forcing over high-mountain Asia: high-resolution WRF-Chem modeling and new satellite observations journal January 2019
Intercomparison and improvement of two-stream shortwave radiative transfer schemes in Earth system models for a unified treatment of cryospheric surfaces journal January 2019