Direct measurement of the hydration state of ambient aerosol populations

Joshua L. Santarpia, Runjun Li, Don R. Collins

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

During the summer of 2002 a modified tandem differential mobility analyzer (TDMA) was used to examine the size-resolved hydration state of the ambient aerosol in southeast Texas. Throughout the study period the sampled aerosol had been exposed to a relative humidity (RH) greater than 80% before or soon after sunrise, while the ambient RH during sampling ranged from about 50 to 70%. To examine any possible size dependence, while also maximizing time resolution, 160 and 320 nm particles were analyzed. To assist in the interpretation of these data, a second, RH-scanning, TDMA was concurrently operated to directly characterize the deliquescence and crystallization properties of the aerosol. The hygroscopic growth of the more hygroscopic population of 160 and 320 nm particles was below that predicted for pure inorganics such as ammonium sulfate, suggesting the sampled particles were composed of mixtures of soluble and insoluble compounds. Although there were slight variations in the measured properties over the course of the study, those particles that were observed to exhibit hygroscopic growth hysteresis were almost always present as metastable aqueous solutions.

Original languageEnglish (US)
Pages (from-to)D18209 1-16
JournalJournal of Geophysical Research Atmospheres
Volume109
Issue number18
DOIs
StatePublished - Sep 27 2004

Fingerprint

aerosols
Aerosols
hydration
Hydration
Atmospheric humidity
aerosol
humidity
relative humidity
analyzers
Ammonium Sulfate
Crystallization
sunrise
ammonium sulfates
Hysteresis
hysteresis
ammonium sulfate
crystallization
Sampling
aqueous solutions
summer

Keywords

  • Crystallization
  • Deliquescence
  • Hygroscopic

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Direct measurement of the hydration state of ambient aerosol populations. / Santarpia, Joshua L.; Li, Runjun; Collins, Don R.

In: Journal of Geophysical Research Atmospheres, Vol. 109, No. 18, 27.09.2004, p. D18209 1-16.

Research output: Contribution to journalArticle

@article{9f299c416aae4786878b58d37efe0486,
title = "Direct measurement of the hydration state of ambient aerosol populations",
abstract = "During the summer of 2002 a modified tandem differential mobility analyzer (TDMA) was used to examine the size-resolved hydration state of the ambient aerosol in southeast Texas. Throughout the study period the sampled aerosol had been exposed to a relative humidity (RH) greater than 80{\%} before or soon after sunrise, while the ambient RH during sampling ranged from about 50 to 70{\%}. To examine any possible size dependence, while also maximizing time resolution, 160 and 320 nm particles were analyzed. To assist in the interpretation of these data, a second, RH-scanning, TDMA was concurrently operated to directly characterize the deliquescence and crystallization properties of the aerosol. The hygroscopic growth of the more hygroscopic population of 160 and 320 nm particles was below that predicted for pure inorganics such as ammonium sulfate, suggesting the sampled particles were composed of mixtures of soluble and insoluble compounds. Although there were slight variations in the measured properties over the course of the study, those particles that were observed to exhibit hygroscopic growth hysteresis were almost always present as metastable aqueous solutions.",
keywords = "Crystallization, Deliquescence, Hygroscopic",
author = "Santarpia, {Joshua L.} and Runjun Li and Collins, {Don R.}",
year = "2004",
month = "9",
day = "27",
doi = "10.1029/2004JD004653",
language = "English (US)",
volume = "109",
pages = "D18209 1--16",
journal = "Journal of Geophysical Research: Atmospheres",
issn = "0148-0227",
publisher = "American Geophysical Union",
number = "18",

}

TY - JOUR

T1 - Direct measurement of the hydration state of ambient aerosol populations

AU - Santarpia, Joshua L.

AU - Li, Runjun

AU - Collins, Don R.

PY - 2004/9/27

Y1 - 2004/9/27

N2 - During the summer of 2002 a modified tandem differential mobility analyzer (TDMA) was used to examine the size-resolved hydration state of the ambient aerosol in southeast Texas. Throughout the study period the sampled aerosol had been exposed to a relative humidity (RH) greater than 80% before or soon after sunrise, while the ambient RH during sampling ranged from about 50 to 70%. To examine any possible size dependence, while also maximizing time resolution, 160 and 320 nm particles were analyzed. To assist in the interpretation of these data, a second, RH-scanning, TDMA was concurrently operated to directly characterize the deliquescence and crystallization properties of the aerosol. The hygroscopic growth of the more hygroscopic population of 160 and 320 nm particles was below that predicted for pure inorganics such as ammonium sulfate, suggesting the sampled particles were composed of mixtures of soluble and insoluble compounds. Although there were slight variations in the measured properties over the course of the study, those particles that were observed to exhibit hygroscopic growth hysteresis were almost always present as metastable aqueous solutions.

AB - During the summer of 2002 a modified tandem differential mobility analyzer (TDMA) was used to examine the size-resolved hydration state of the ambient aerosol in southeast Texas. Throughout the study period the sampled aerosol had been exposed to a relative humidity (RH) greater than 80% before or soon after sunrise, while the ambient RH during sampling ranged from about 50 to 70%. To examine any possible size dependence, while also maximizing time resolution, 160 and 320 nm particles were analyzed. To assist in the interpretation of these data, a second, RH-scanning, TDMA was concurrently operated to directly characterize the deliquescence and crystallization properties of the aerosol. The hygroscopic growth of the more hygroscopic population of 160 and 320 nm particles was below that predicted for pure inorganics such as ammonium sulfate, suggesting the sampled particles were composed of mixtures of soluble and insoluble compounds. Although there were slight variations in the measured properties over the course of the study, those particles that were observed to exhibit hygroscopic growth hysteresis were almost always present as metastable aqueous solutions.

KW - Crystallization

KW - Deliquescence

KW - Hygroscopic

UR - http://www.scopus.com/inward/record.url?scp=10244244980&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=10244244980&partnerID=8YFLogxK

U2 - 10.1029/2004JD004653

DO - 10.1029/2004JD004653

M3 - Article

AN - SCOPUS:10244244980

VL - 109

SP - D18209 1-16

JO - Journal of Geophysical Research: Atmospheres

JF - Journal of Geophysical Research: Atmospheres

SN - 0148-0227

IS - 18

ER -