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