SPACCS 2008 summary meeting 1 S torm P eak A erosol and C loud C haracterization S tudy
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Transcript of SPACCS 2008 summary meeting 1 S torm P eak A erosol and C loud C haracterization S tudy
SPACCS 2008 summary meeting 1Storm Peak Aerosol and Cloud Characterization Study
May 12, 2008
Goals of today’s meeting
• Review of data collected• Update of analysis/results• Discussion of papers from field study
– Identification of overlap and collaborations
• Timelines
http://acd.ucar.edu/~christin/SPstudy/MainStudy.htm
Data Summary
• All data collected during the study
(see Tables)• instruments up to site: March 24, 2008
instruments down: April 14, 2008 (3 week period)
Meteorology Summary• At SPL:
• General observations: – Pressure steady– Temperatures variable- but never below 00F– Relative Humidity- only a few times less than 60% – Winds calmer during second part of study
Average Temp
(oF)
Average Wind Speed (mph)
Average Wind Direction (degree)
week 1 (03/23/08 - 03/30/08) 21 15 244
week 2 (03/31/08 - 04/05/08) 17 14 242
week 3 (04/06/08 - 04/14/08) 20 11 253
Clear conditions defined as RH < 70% 27% of time from March 23-April 15 As opposed to Lowenthal et al. (2002) 62% clear from April 18-May 17, 2001
Meteorological Summary
• Winds typically from S, W, N (West)– From 1500-3600
– Average (03/23-04/15) wind direction 2440 (SW)– Average wind direction at 12:00 local time: 2460 (SW)
0/3600
900
450
13501800
2250
2700
3150
0.02
0.03
0.04
0.05
0.06
0.07
4/4/20080:00
4/4/200812:00
4/5/20080:00
4/5/200812:00
4/6/20080:00
4/6/200812:00
4/7/20080:00
4/7/200812:00
4/8/20080:00
4/8/200812:00
Ozo
ne
(p
pm
)
Need to confirm times!
Mountain Meteorology
1
3 2
5
6
7
Dry Bulb TRelative Hum.- No data for 0 or 4
the aerosol absorption
total aerosol scattering
Things to update/go over
• Mountain met: How do we confirm when we were in the free troposphere?
• What other data needs to be posted?– SMPS/APS
• Correct for multiple charge? (Lowenthal et al., 2002)
– What times (am or pm) were the O3 files started at (confirm with Gannet)
Future Directions
• Comparison of Hi-Vol ECOC amounts to continuous measurements
• Comparison of high EC peaks to lab events/CO/CO2/O3 data
• Look at Asian dust trajectories correlated with ECOC values• Sources of aerosols measured
ECOC + Hi Vol UpdateSPACC 2008
Eszter Horanyi
5-7-08
PM2.5 Measurements
PM2.5 OC Concentration
0
0.5
1
1.5
2
2.5
3
3.5
4/4/120:00
4/5/120:00
4/6/120:00
4/7/120:00
4/8/120:00
4/9/120:00
4/10/12 0:00
4/11/12 0:00
Time
OC
Co
nce
ntr
ati
on
(u
g/m
3)
Free Trop
BL
Only 2 days of data1 during low EC for PM10 and 1 during high EC event
High EC event in both BL & FT, OC seems unaffected
PM2.5 EC Concentrations
-5.00E-02
0.00E+00
5.00E-02
1.00E-01
1.50E-01
2.00E-01
2.50E-01
3.00E-01
4/4/120:00
4/5/120:00
4/6/120:00
4/7/120:00
4/8/120:00
4/9/120:00
4/10/120:00
4/11/120:00
EC
Con
cen
trati
on
(u
g/m
3)
Free Trop
BL
PM10 Measurements
PM10 Thermal OC Concentration
0
0.5
1
1.5
2
2.5
3/30/120:00
4/1/120:00
4/3/120:00
4/5/120:00
4/7/120:00
4/9/120:00
4/11/120:00
4/13/120:00
4/15/120:00
4/17/120:00
Co
nce
ntr
ati
on
(u
g/m
3)
FT
BL
PM10 Thermal EC Concentration
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
3/30/120:00
4/1/120:00
4/3/120:00
4/5/120:00
4/7/120:00
4/9/120:00
4/11/120:00
4/13/120:00
4/15/120:00
4/17/120:00
Con
cen
trati
on
(u
g/m
3)
FT
BL
4 distinct high EC event during studyFirst and last only effects boundary layerMiddle two involve free troposphere in addition to BL
ECOC Analysis
• PM 2.5 machine reading systematically high• Adjustments and calibrations currently under way• Final volumes and concentrations expected by end of May
Hi-Vol Data
Noise level is ~ 2 ug/m3
Mass Difference (g) Total Volume (m3) Concentration Sample Type-2.83333E-05 Blank (ug/m3)
0.00013 58.248 2.231826819 PM2.5 Night-1.5E-05 Blank
3.33333E-05 28.122 1.185331227 PM2.5 Night1.66667E-05 7.663 2.175037465 PM10 Night
1E-04 50.542 1.978569976 PM2.5 Day4.5E-05 15.239 2.952988291 PM10 Day9E-05 61.161 1.471514805 PM2.5 Night
4.66667E-05 21.827 2.138003347 PM10 Night0.00022 113.535 1.937723068 PM2.5 Day7.5E-05 30.318 2.473810316 PM10 Day2E-05 13.416 1.490716404 PM2.5 Day-2E-05 4.079 -4.90350719 PM10 Day6E-05 11.228 5.344003333 PM10 Night
9.33333E-05 37.261 2.504831323 PM2.5 Night
Teflon filters weighed with many having enough mass to move forward
Concentration of total, biological, and bacterial ice nuclei active at -7oC in snow from Montana, France, Antarctica, and the Yukon
Christner et al. (2008) Science 319:1214
Cluster analysis of biological ice nucleating data from Montana snowfall 2005-2006
0.00
0.50
1.00
1.50
2.00
B
Christner et al., in preparation
Cells L-1 x 104
0 5 10 15 20 25
Pre
dic
ted
ce
lls L
-1 x
104
0
5
10
15
20
25
Biological ice nuclei L-1 at -7oC
0 20 40 60 80 100 120
Pre
dicte
d b
iolo
gical ice
nu
clei L
-1 at -7
oC
0
20
40
60
80
100
120Cell model 1 (TOC, NH4
+,and Ca2+); r = 0.929
Cell model 2 (TOC, NH4+, Ca2+ and site); r = 0.983
Biological IN model (TOC, NO32-, Ca2+, and Cl-); r = 0.979
Multiple regression model for predicting the cell and biological ice nuclei concentration in Montana snowfall 2005-2006
Christner et al., in preparation