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Title: Impacts of aerosols on seasonal precipitation and snowpack in California based on convection-permitting WRF-Chem simulations

Journal Article · · Atmospheric Chemistry and Physics (Online)
 [1]; ORCiD logo [2];  [1];  [1];  [3];  [4];  [5]; ORCiD logo [2];  [2];  [6]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, Riverside, CA (United States)
  4. Univ. of Science and Technology of China, Anhui (China)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. California Inst. of Technology (CalTech), Pasadena, CA (United States); Ewha Womans Univ., Seoul (South Korea)

Here, a version of the WRF-Chem model with fully coupled aerosol–meteorology–snowpack is employed to investigate the impacts of various aerosol sources on precipitation and snowpack in California. In particular, the impacts of locally emitted anthropogenic and dust aerosols, and aerosols transported from outside California are studied. We differentiate three pathways of aerosol effects: aerosol–radiation interaction (ARI), aerosol–snow interaction (ASI), and aerosol–cloud interaction (ACI). The convection-permitting model simulations show that precipitation, snow water equivalent (SWE), and surface air temperature averaged over the whole domain (34–42° N, 117–124° W, not including ocean points) are reduced when aerosols are included, therefore reducing large biases in these variables due to the absence of aerosol effects in the model. Aerosols affect California water resources through the warming of mountaintops and the reduction of precipitation; however, different aerosol sources play different roles in changing surface temperature, precipitation, and snowpack in California by means of various weights of the three pathways. ARI by all aerosols mainly cools the surface, leading to slightly increased SWE over the mountains. Locally emitted dust aerosols warm the surface of mountaintops through ASI, in which the reduced snow albedo associated with dusty snow leads to more surface absorption of solar radiation and reduced SWE. Transported aerosols and local anthropogenic aerosols play a dominant role in increasing nonprecipitating clouds but reducing precipitation through ACI, leading to reduced SWE and runoff on the Sierra Nevada, as well as the warming of mountaintops associated with decreased SWE and hence lower surface albedo. The average changes in surface temperature from October 2012 to June 2013 are about –0.19 and 0.22 K for the whole domain and over mountaintops, respectively. Overall, the averaged reduction during October to June is about 7 % for precipitation, 3 % for SWE, and 7 % for surface runoff for the whole domain, while the corresponding numbers are 12, 10, and 10 % for the mountaintops. The reduction in SWE is more significant in a dry year, with 9 % for the whole domain and 16 % for the mountaintops. The maximum reduction of ~20 % in precipitation occurs in May and is associated with the maximum aerosol loading, leading to the largest decrease in SWE and surface runoff over that period. It is also found that dust aerosols can cause early snowmelt on the mountaintops and reduced surface runoff after April.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
EPC-14-064; AC05-76RL01830
OSTI ID:
1437033
Report Number(s):
PNNL-SA-134486
Journal Information:
Atmospheric Chemistry and Physics (Online), Vol. 18, Issue 8; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English

References (96)

Radiative forcing and climate response journal March 1997
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
Aerosol indirect effect over the Indian Ocean journal January 2006
Flood or Drought: How Do Aerosols Affect Precipitation? journal September 2008
Measured black carbon deposition on the Sierra Nevada snow pack and implication for snow pack retreat journal January 2010
Rapid calculation of radiative heating rates and photodissociation rates in inhomogeneous multiple scattering atmospheres journal January 1989
Springtime warming and reduced snow cover from carbonaceous particles journal January 2009
Mineral dust transport to the Sierra Nevada, California: Loading rates and potential source areas journal January 2011
WRF-Chem simulation of aerosol seasonal variability in the San Joaquin Valley journal January 2017
Fully coupled “online” chemistry within the WRF model journal December 2005
Systematic Patterns of the Inconsistency between Snow Water Equivalent and Accumulated Precipitation as Reported by the Snowpack Telemetry Network journal December 2012
Benefit of convection permitting climate model simulations in the representation of convective precipitation journal August 2014
Impact of buildings on surface solar radiation over urban Beijing journal January 2016
Effects of aerosols on precipitation from orographic clouds: EFFECTS OF AEROSOLS ON PRECIPITATION journal May 2007
Radiative impact of mineral dust on monsoon precipitation variability over West Africa journal January 2011
Dirty snow after nuclear war journal February 1985
Atmospheric responses to the redistribution of anthropogenic aerosols journal September 2015
Dust and Biological Aerosols from the Sahara and Asia Influence Precipitation in the Western U.S. journal February 2013
A GCM investigation of impact of aerosols on the precipitation in Amazon during the dry to wet transition journal June 2016
Impact of interannual variations in sources of insoluble aerosol species on orographic precipitation over California's central Sierra Nevada journal January 2015
Modeling regional aerosol and aerosol precursor variability over California and its sensitivity to emissions and long-range transport during the 2010 CalNex and CARES campaigns journal January 2014
Impact of disturbed desert soils on duration of mountain snow cover journal January 2007
Uncertainty in modeling dust mass balance and radiative forcing from size parameterization journal January 2013
The Relative Roles of Sulfate Aerosols and Greenhouse Gases in Climate Forcing journal April 1993
A controlled snowmaking experiment testing the relation between black carbon content and reduction of snow albedo journal January 2011
Measurement of the Effect of Amazon Smoke on Inhibition of Cloud Formation journal February 2004
Regional climate effects of aerosols over China: modeling and observation journal September 2003
Aircraft measurements of the impacts of pollution aerosols on clouds and precipitation over the Sierra Nevada journal January 2008
Connecting surface emissions, convective uplifting, and long-range transport of carbon monoxide in the upper troposphere: New observations from the Aura Microwave Limb Sounder journal January 2007
Climatic effects of different aerosol types in China simulated by the UCLA general circulation model journal January 2006
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
Trans-Pacific transport and evolution of aerosols: evaluation of quasi-global WRF-Chem simulation with multiple observations journal January 2016
Characterization of speciated aerosol direct radiative forcing over California: AEROSOL DIRECT RADIATIVE FORCING journal March 2013
Simulating cold season snowpack: Impacts of snow albedo and multi-layer snow physics journal November 2011
Multi-angle Imaging SpectroRadiometer (MISR) instrument description and experiment overview journal July 1998
The Regional Particulate Matter Model: 1. Model description and preliminary results journal January 1995
Snow process modeling in the North American Land Data Assimilation System (NLDAS): 1. Evaluation of model‐simulated snow cover extent journal November 2003
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
Simulating 3-D radiative transfer effects over the Sierra Nevada Mountains using WRF journal January 2012
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
The spatial distribution of mineral dust and its shortwave radiative forcing over North Africa: modeling sensitivities to dust emissions and aerosol size treatments journal January 2010
Aspects of the diurnal cycle in a regional climate model [Aspects of the diurnal cycle in a regional climate model] journal August 2008
Dust aerosol impact on North Africa climate: a GCM investigation of aerosol-cloud-radiation interactions using A-Train satellite data journal January 2012
Climate Forcing by Anthropogenic Aerosols journal January 1992
A WRF simulation of the impact of 3-D radiative transfer on surface hydrology over the Rocky Mountains and Sierra Nevada journal January 2013
Elevation-dependent warming in mountain regions of the world journal April 2015
Asian aerosols in North America: Extracting the chemical composition and mass concentration of the Asian continental aerosol plume from long-term aerosol records in the western United States journal January 2003
Predicting global atmospheric ice nuclei distributions and their impacts on climate journal June 2010
Detection of Asian dust in California orographic precipitation journal January 2011
Present-day climate forcing and response from black carbon in snow journal January 2007
How unusual is the 2012-2014 California drought?: GRIFFIN AND ANCHUKAITIS journal December 2014
The Impact of Direct Aerosol Radiative Forcing on Surface Insolation and Spring Snowmelt in the Southern Sierra Nevada journal October 2006
A global model simulation for 3-D radiative transfer impact on surface hydrology over the Sierra Nevada and Rocky Mountains journal January 2015
Springtime warming and reduced snow cover from carbonaceous particles journal January 2008
Aerosol impacts on California winter clouds and precipitation during CalWater 2011: local pollution versus long-range transported dust journal January 2014
Nonhydrostatic icosahedral atmospheric model (NICAM) for global cloud resolving simulations journal March 2008
Coupling aerosol-cloud-radiative processes in the WRF-Chem model: Investigating the radiative impact of elevated point sources journal January 2009
Evolution of ozone, particulates, and aerosol direct radiative forcing in the vicinity of Houston using a fully coupled meteorology-chemistry-aerosol model journal January 2006
Effect of absorbing aerosols on snow albedo reduction in the Sierra Nevada journal August 2012
Enhanced solar energy absorption by internally-mixed black carbon in snow grains journal January 2012
Model for Simulating Aerosol Interactions and Chemistry (MOSAIC) journal January 2008
California Irrigation Management Information System journal April 1984
Impact of aerosols on ice crystal size journal January 2018
A review on regional convection‐permitting climate modeling: Demonstrations, prospects, and challenges journal May 2015
Snowpack radiative heating: Influence on Tibetan Plateau climate journal January 2005
Asian continental aerosol persistence above the marine boundary layer over the eastern North Pacific: Continuous aerosol measurements from Intercontinental Transport and Chemical Transformation 2002 (ITCT 2K2) journal January 2005
MIRAGE: Model description and evaluation of aerosols and trace gases journal January 2004
Impact on modeled cloud characteristics due to simplified treatment of uniform cloud condensation nuclei during NEAQS 2004 journal January 2007
Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4) journal January 2010
Technical Note: Evaluation of the WRF-Chem "Aerosol Chemical to Aerosol Optical Properties" Module using data from the MILAGRO campaign journal January 2010
High resolution regional climate model simulations for Germany: part I—validation journal September 2012
Improving snow albedo processes in WRF/SSiB regional climate model to assess impact of dust and black carbon in snow on surface energy balance and hydrology over western U.S.: Physical snow processes with WRF/SSiB journal April 2015
Evaluation of the convection-resolving regional climate modeling approach in decade-long simulations journal July 2014
Heavy pollution suppresses light rain in China: Observations and modeling journal January 2009
Light-absorbing particles in snow and ice: Measurement and modeling of climatic and hydrological impact journal November 2014
Effect of aerosol on warm convective clouds: Aerosol-cloud-surface flux feedbacks in a new coupled large eddy model journal January 2006
Response of Colorado River runoff to dust radiative forcing in snow journal September 2010
The detection and correction of snow water equivalent pressure sensor errors journal January 2004
Representing Equilibrium and Nonequilibrium Convection in Large-Scale Models journal February 2014
Tropical Intraseasonal Variability in Version 3 of the GFDL Atmosphere Model journal January 2013
Observed and model-simulated diurnal cycles of precipitation over the contiguous United States journal March 1999
The Dynamical Core, Physical Parameterizations, and Basic Simulation Characteristics of the Atmospheric Component AM3 of the GFDL Global Coupled Model CM3 journal July 2011
Mid-Century Ensemble Regional Climate Change Scenarios for the Western United States journal January 2004
Importance of Regional Climate Model Grid Spacing for the Simulation of Heavy Precipitation in the Colorado Headwaters journal July 2013
Characteristics of the western United States snowpack from snowpack telemetry (SNOTEL) data journal July 1999
Characteristics of large snowfall events in the montane western United States as examined using snowpack telemetry (SNOTEL) data journal March 2001
The Influence of Pollution on the Shortwave Albedo of Clouds journal July 1977
The Resolution Dependence of Explicitly Modeled Convective Systems journal April 1997
A Model for the Spectral Albedo of Snow. I: Pure Snow journal December 1980
A new lumped structure photochemical mechanism for large-scale applications journal December 1999
Regional climate effects of aerosols over China: modeling and observation journal December 2011
Coupling aerosol-cloud-radiative processes in the WRF-Chem model: investigating the radiative impact of elevated point sources journal January 2008
Elevation-dependent warming in mountain regions of the world text January 2015
Tropical Intraseasonal Variability in Version 3 of the GFDL Atmosphere Model text January 2013
A review on regional convection‐permitting climate modeling: Demonstrations, prospects, and challenges text January 2015

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