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Title: Process Studies of Climatically Relevant Parts of the Aerosol Life Cycle


This report is organized into three sections. Section A provides highlights of selected publications. Section B lists participation in ASR focus or working groups related to the grant. Section C lists publications supported by grant.

  1. Harvard Univ., Cambridge, MA (United States)
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Technical Report
Country of Publication:
United States

Citation Formats

Martin, Scot T. Process Studies of Climatically Relevant Parts of the Aerosol Life Cycle. United States: N. p., 2015. Web. doi:10.2172/1176936.
Martin, Scot T. Process Studies of Climatically Relevant Parts of the Aerosol Life Cycle. United States. doi:10.2172/1176936.
Martin, Scot T. 2015. "Process Studies of Climatically Relevant Parts of the Aerosol Life Cycle". United States. doi:10.2172/1176936.
title = {Process Studies of Climatically Relevant Parts of the Aerosol Life Cycle},
author = {Martin, Scot T.},
abstractNote = {This report is organized into three sections. Section A provides highlights of selected publications. Section B lists participation in ASR focus or working groups related to the grant. Section C lists publications supported by grant.},
doi = {10.2172/1176936},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 3

Technical Report:

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  • Organic aerosols (OA) are an important but poorly characterized component of the earth’s climate system. Enormous complexities commonly associated with OA composition and life cycle processes have significantly complicated the simulation and quantification of aerosol effects. To unravel these complexities and improve understanding of the properties, sources, formation, evolution processes, and radiative properties of atmospheric OA, we propose to perform advanced and integrated analyses of multiple DOE aerosol mass spectrometry datasets, including two high-resolution time-of-flight aerosol mass spectrometer (HR-AMS) datasets from intensive field campaigns on the aerosol life cycle and the Aerosol Chemical Speciation Monitor (ACSM) datasets from long-term routinemore » measurement programs at ACRF sites. In this project, we will focus on 1) characterizing the chemical (i.e., composition, organic elemental ratios), physical (i.e., size distribution and volatility), and radiative (i.e., sub- and super-saturated growth) properties of organic aerosols, 2) examining the correlations of these properties with different source and process regimes (e.g., primary, secondary, urban, biogenic, biomass burning, marine, or mixtures), 3) quantifying the evolutions of these properties as a function of photochemical processing, 4) identifying and characterizing special cases for important processes such as SOA formation and new particle formation and growth, and 5) correlating size-resolved aerosol chemistry with measurements of radiative properties of aerosols to determine the climatically relevant properties of OA and characterize the relationship between these properties and processes of atmospheric aerosol organics. Our primary goal is to improve a process-level understanding of the life cycle of organic aerosols in the Earth’s atmosphere. We will also aim at bridging between observations and models via synthesizing and translating the results and insights generated from this research into data products and formulations that may be directly used to inform, improve, and evaluate regional and global models. In addition, we will continue our current very active collaborations with several modeling groups to enhance the use and interpretation of our data products. Overall, this research will contribute new data to improve quantification of the aerosol’s effects on climate and thus the achievement of ASR’s science goal of – “improving the fidelity and predictive capability of global climate models”.« less
  • As part of EPRI Research Project 2253-1, ''Remaining-Life Estimation of Boiler Pressure Parts,'' one of the program's principal objectives was the identification and characterization of the relevant damage mechanism in elevated temperature headers and steamlines. Described herein are the results of work undertaken at Combustion Engineering and the Central Electricity Research Laboratories (CERL) in fulfillment of that task. Conclusions regarding the range of operating conditions to which headers are exposed, the typical damage mechanisms that affect their service lives, and the anticipated modes of failure have been based on information obtained from three sources: (1) a comprehensive survey of utilities,more » (2) extensive on-site examinations of operating components, and (3) laboratory analyses of samples removed both from headers retired from service and from headers still in operation. 32 refs., 72 figs., 9 tabs.« less
  • A methodology for predicting the remaining creep crack growth life in boiler thick section components has been developed. The creep crack growth behavior of a 1-1/4Cr-1/2Mo header material can be characterized by the C/sub t/ parameter over a wide range of crack growth rates and under conditions ranging from small-scale to large-scale creep. Limited finite-element results show that C/sub t/, as measured at the loading pins of test specimens, can be used as a measure of the crack tip stress field in the non-steady-state creep regime. This may be the reason that C/sub t/ characterizes creep crack growth behavior. Themore » experimentally measured values of C/sub t/ in compact-type specimens compared well with those obtained from the general analytical equations developed in this program. Analytical equations have been formulated for estimating C/sub t/ in structural components. The creep deformation rates and the creep crack growth rates of the material machines from the hot region of the header were found to be greater than those from the cold region. Varying the specimen diameter from 1.98 to 12.83 mm did not affect creep deformation and rupture data. The developed life prediction methodology is demonstrated by using two hypothetical examples of a cracked header-like component and an elevated-temperature steam pipe. 39 refs., 49 figs., 11 tabs.« less
  • Fatigue studies conducted to project the expected life and safety factors of the rotor housing of cast aluminum 2013R natural gas fueled rotary engines (NGREs) are documented. The rotor housing was selected because previous studies showed this major engine component to be the critical item in determining fatigue life. The report describes the sequential steps required for fatigue life calculations, including the heat transfer, thermal stress, pressure stress, fatigue life, and safety factor analyses. The fatigue analysis requires the determination of thermal and presure stresses. The former is viewed as providing the steady-state component, while the latter contributes both tomore » the steady-state and the alternating components of the stresses in the fatigue analysis. Both of these stresses are a function of the engine peak combustion pressure at the rated condition, but are somewhat independent of speed. The rated speed enters only in the calculation of heat transfer coefficients, and when translating the projected cycles-to-failure into hours of operating life.« less