Experimental Atmospheric Chemistry (12.335/12.835) · Experimental Atmospheric Chemistry...
Transcript of Experimental Atmospheric Chemistry (12.335/12.835) · Experimental Atmospheric Chemistry...
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Experimental Atmospheric Chemistry (12.335/12.835)
Section 3, Lecture 3:
Karin Ardon-Dryer & Sarvesh Garimella
Tuesday, Nov 25, 2014
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Today
• Atmospheric Particles
• Atmospheric Clouds
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Remainder of Today
Seinfeld and Pandis
This image has been removed due to copyright restrictions.Please see: Figure 2.15 of the book Atmospheric Chemistry and Physics:From Air Pollution to Climate Change. ISBN: 9780471720188.
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Aerosol Abundance
Unless otherwise specified figures from Seinfeld and Pandis
This image has been removed due to copyright restrictions.
Please see: Table 2.20 of the book Atmospheric Chemistry and Physics:From Air Pollution to Climate Change. ISBN: 9780471720188.
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Aerosol Composition Before 1994
• So, what’s the problem(s) here? •Courtesy / adapted from J. Jimenez
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Thermal Desorption Aerosol Mass Spectrometer
https://www.tropos.de/en/research/projects-infrastructures-technology/technology-at-tropos/chemical-analytics/aerosol-mass-spectrometry-techniques/
This image has been removed due to copyright restrictions.Please see: http://cires1.colorado.edu/jimenez/amsanimation.gif.
This image has been removed due to copyright restrictions.Please see: http://www.airmonitor.cn/upload/editorfiles/2008.12.3_13.43.7_7015.JPG.
This image has been removed due to copyright restrictions.Please see: http://www.tropos.de/fileadmin/_processed_/csm_Aerosol_chemicalKK_20131212_c10452182e.jpg.
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Single Particle Mass Spectrometry
Particle Inlet
Particle Sizing
Particle Composition
+ -+ -
2/ tzm µ
Inte
nsity
2/ tzm µ
Inte
nsity
start 0
200
100300µsstop
0
200
100300µs
0
200
100300µs
Courtesy of D. Gross
PALMS Particle Analysis by Laser Mass Spectrometry
Image courtesy of Deborah Gross. Used with permission.7
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0.001
0.01
0.1
1
10
ion
cu
rre
nt
(mA
)
2202102001901801701601501401301201101009080706050403020100m/z
C+
C2+
SO+
CO+
Pb+
NO+
C3+
HSO3+HSO2
+
H3SO4+
0.001
0.01
0.1
1
10
ion
cu
rre
nt
(mA
)
2202102001901801701601501401301201101009080706050403020100m/z
Apr 07 16:068.5 km 237 KDa = 1.3 m
C+
Na+
SO+
Al+
Fe+
Ca+
Ba+
Cu+
Li+
K+
Pb+
Rb+
Mineral Dust particle
Sulfate-Organic particle
adapted from D. Cziczo
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Influential Results
Murphy et al. Science 1998 9
0.3
0.2
0.1
0.0
0.3
0.4
0.2
0.1
0.0
0 20 40 60 80 100 120
0 20 40 60 80 100 120
O-S-
HSO4-
HSO3-
SO3- SO4
-H34SO4
-OH-
OH-C2
-
CHO2-
C2H2O-O-H-
C2H5CO2-
CH3CO2- SO4
-79Br-35Cl-
A
B
19980507 #667219 km: 31oNθ=437 K
19980501 #112014.6 km: 22oNθ=360 K
Det
ecto
r Sig
nal (
mA)
Det
ecto
r Sig
nal (
mA)
Ion mass/charge
CN- & C2H2-
SO3-
HSO3-
HSO4-
l-
CH2OHSO3-
H34SO4-
La
Ac Th Pa U
Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
H
Li Be
Na Mg
K
Rb
Cs
Fr
Ba
Ra
Sr
Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br
Ru Rh Pd Ag Cd In Sn Sb Te ITc
Re Os Ir Pt Au Hg Tl Pb Bi Po At
Mo
W
Nb
TaHf
ZrY
most many common some rare maybeHe
NeB C N O F
Al Si P S Cl Ar
Kr
Xe
Rn
Figure by MIT OpenCourseWare.
Figure by MIT OpenCourseWare.
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Free Tropospheric
K. Froyd, unpublished
• Biomass Burning
• Sulfate-Organicmixtures dominate in UTLS
• Mineral Dust: 10-30%
• Little Sea Salt in UT
• Meteoric particles in stratosphere
• Acidic sulfate mainly in stratosphere
Tropopause
Number Fraction
m)
(k
tud
eA
lti
Image courtesy of Karl Froyd. Used with permission.10
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Murphy et al. JGR 2006
This image has been removed due to copyright restrictions.
Please see Figure 6 on page: https://cloud1.arc.nasa.gov/
intex-na/publications/articles/2006JD007340.pdf.
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Influential Results
Zhang et al. GRL2007
This image has been removed due to copyright restrictions.Please see: http://eloquentscience.com/wp-content/uploads/2013/03/img_global.jpg.
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What Forms Clouds?
Seinfeld and Pandis, 2006
This image has been removed due to copyright restrictions.
Please see: Figure 2.15 of the book Atmospheric Chemistry and Physics:From Air Pollution to Climate Change. ISBN: 9780471720188.
This image has been removed due to copyright restrictions.
Please see: Figure 17.6 of the book Atmospheric Chemistry and Physics:From Air Pollution to Climate Change. ISBN: 9780471720188.
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Cloud Formation Basics
"The Atmosphere", Lutgens and Tarbuck, 10th Edition Reference Texts on Reserve in EPSc Library: "Understanding Our Atmospheric Environment", Neiburger et al. "Meteorology Today", Ahrens http://epsc.wustl.edu/courses/epsc105a/, W. H. Smith
http://jennyse7en.blogspot.com/
This image has been removed due to copyright restrictions.Please see: http://www.harding.edu/lmurray/113_files/html/d2_earth%20revised/img037.jpg.
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Cloud Development Clouds form as air rises, expands and cools
Most clouds form by: a. Surface heating and free convection b.. Lifting of air over
topography c. Widespread air lifting
due to surface convergence
d. Lifting along weather fronts
http://www.sir-ray.com/cloudformation2.jpg © sources unknown. All rights reserved. This content is excludedfrom our Creative Commons license. For more information, seehttp://ocw.mit.edu/help/faq-fair-use/.
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A Few Words About ALL Clouds
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This image has been removed due to copyright restrictions.
Please see the image on page: http://scied.ucar.edu/webweather/clouds/cloud-types.
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• Contrail clouds •Ship track •Mammatus clouds • Orographic clouds
Classification of Clouds
Other Cloud Types:
Temperatures
By their shape and heights
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0˚C 0˚C 0˚C
Mixed Phase cloud
Glaciated cloud
Warm cloud
Water drop Ice crystal
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Stratiform High-Level Clouds Mid-Level Clouds Low-Level Clouds
Clouds Classification
Convective
Clouds with Vertical Development
Stratiform Convective
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Contrails
Other Cloud Types
Image courtesy of NASA.
Image courtesy of NASA.http://commons.wikimedia.org/wiki/File:Sfc.contrail.1.26.01.JPG.
© Aviationstirling. Some rights reserved. License:CC BY-SA. This content is excluded from ourCreative Commons license. For more information,
see http://ocw.mit.edu/help/faq-fair-use/.
This image has been removed due to copyright restrictions.Please see the image on page: http://www.rainbowskill.com/wp-content/uploads/2009/07/a132.jpg.
This image has been removed due to copyright restrictions.Please see the image on page: https://s-media-cache-ak0.pinimg.com/736x/76/e3/63/76e363ed61675f5de64f68a1608197ad.jpg.
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Clouds with high concentrations of cloud drops are referred to as continental clouds. These are more often found over land.
Clouds with low concentrations of cloud drops are called maritime clouds and they are often found in clean regions and over water.
Continental and Maritime clouds
clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. Continental clouds
clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. clean regions and over water. Maritime clouds
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Clouds
Lamb and Verlinde
o
r Ic
ed
C
ol
P
-M
arm
W
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Troposphere
Tropopause
Cloud anvil
winds
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This image has been removed due to copyright restrictions.Please see the image on page:http://teachertech.rice.edu/Participants/louviere/Images/profile.gif.
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Higher Temperature, Lower Humidity Lower Temperature, Higher Humidity
Condensation Nucleus
(Grey = Soluble or Insoluble)
(Black = Solid)
Droplet
Ice Crystal
Heterogeneous Droplet Activation : ~101%RH
Heterogeneous Ice Nucleation : ~120% RH Ice Nucleus (IN)
od
e Contact Freezing
Mon
itael
Nuc
Deposition Freezing
Homogeneous Ice Nucleation: ~160% RH Homogeneous Freezing Nucleus (HFN)
Particles take up water
Homogeneous Nucleation : ~400% RH!
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Supe
rsat
urat
ion
(With
Res
pect
to Ic
e)
Temperature (°C) 0 -50 1.0
1.6
Droplets and Ice Crystals ~ -38° C
Droplet Activation
Contact Freezing
Deliquescence
Hom
ogen
eous
Fr
eezi
ng
Free
zing
Fr
eezi
ng
Ice Only
Figure 3.
Aerosol and Ice
Condensation Freezing
Condensation Condensation
Deliquescence
Deliquesced Aerosol and
Ice
Deposition Freezing
Heterogeneously Formed Clouds: -Few but large ice crystals -Shorter lifetime due to crystal size -Clouds possible at lower altitude (higher T, lower RH)
Homogeneously Formed Clouds - Almost all particles nucleate ice - Many small ice crystals - Longer lifetime - Higher altitude clouds
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Cloud Measurement
DMT, Boulder, CO
Cloud Imaging Probe (CIP)
Passive Cavity Aerosol Spectrometer Probe (PCASP-100X)
This image has been removed due to copyright restrictions.
Please see the "Cloud Droplet Probe" image on page:http://dev.dropletmeasurement.com/products/airborne.
Cloud Droplet Probe (CDP-2)
This image has been removed due to copyright restrictions.Please see the "Cloud Imaging Probe" image on page:http://dev.dropletmeasurement.com/products/airborne.
This image has been removed due tocopyright restrictions.Please see the "Ultra-High Sensitivity Aerosol
Spectrometer" image on page: http://dev.
dropletmeasurement.com/products/airborne.
This image has been removed due
to copyright restrictions.
Please see the "Passive Cavity Aerosol" image
on page: http://dev.dropletmeasurement.com/products/airborne.
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PCVI - Pumped Counter flow Virtual Impactor
add
pump
Fluid flow velocity characteristics during passage through the PCVI
Kulkarni et al AST 2011
This image has been removed due to copyright restrictions.Please see Figure 3 on page:http://www.tandfonline.com/doi/pdf/10.1080/02786826.2010.539291.
This image has been removed due to copyright restrictions.Please see Figure 4 on page:http://www.tandfonline.com/doi/pdf/10.1080/02786826.2010.539291.
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Analysis of Cloud Residuals Single particle size and composition (0.2 – 3 mm)
Offline – SEM + EDS
This image has been removed due to copyright restrictions.Please see Figure 1 on page: http://www.sciencemag.org/content/340/6138/1320.full.
Size, morphology, and composition
Online - PALMS
detect a particle & meas size
focus particles vaporize & ionize – + + Time-of-flight + MS
–+ – 19
3
analyze ions
nm
Size and composition
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Cziczo et al. 2013 29
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Cziczo et al. 2013
This images has been removed due to copyright restrictions.
Please see Figure 2 on page: http://www.sciencemag.org/content/340/6138/1320.full.
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Sulfate-
Organic Biomass Burning
Mineral
Dust &
Metallic
Sea Salt
Unclassified
EC
Cziczo et al. 2013
This image has been removed due to copyright restrictions.Please see Figure 1 on page:http://www.sciencemag.org/content/340/6138/1320.full.
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0 1
• Parallel plates • Ice on walls
– Ice saturation • Linear temp and vapor gradient • Nonlinear saturation ratio
Detector – Clausius-Clayperon Relation
Sarvesh Garimella PhD work
Making Clouds in the lab Spectrometer for Ice Nuclei (SPIN) Commercially available from DMT, Boulder, CO Based on Zurich Ice Nucleation Chamber (Stetzer. Lohmann)
This image has been removed dueto copyright restrictions.Please see: http://www.dropletmeasurement.com/sites/default/files/pictures/Products/SPIN/SPIN_2.gif.
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Drop freezing technique
Cold metal plate
CCD Camer
a
130 drops (1µl; 0.8mm diameter)
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