**[arm aerosol IOP telecon 2-19-2003]{.underline}**

ferrare, cahill, daum, yin-nan lee, kirchstetter, ogren, sheridan,
schwartz, feingold, schmid, michalsky, hudson, strawa, flynn, ghan,
bucholz, covert, wang, wagener, arnott, pilewskie, zhanqing li, nelson

updates, action items

**1. Rick Wagener to check on archiving preliminary IOP data and setting
up user accounts.**

**2. Ted Cress to set up meeting with FAA, USAF, CIRPAS for flight
coordination.**

**3. Rich to check on foreign national access to Ponca City airport.**

**4. Steve to ping ACP people to get requirements for setting up
instruments in GIF trailer. Steve needs to ping Cowin and Aerodyne Mass
spec people.**

**5. Dan, Joe, Pat, Connor to investigate potential glint problems from
10 m stack at GIF trailer.**

**6. John, Pat S to investigate implementing 1 μm cut in GIF trailer for
IOP.**

**7. Dan, Connor? Investigate issue of setting up flame for aerosol
generation in GIF, aerosol trailers.**

**8. Pat S to canvass community about participation in intercomparison
activities.**

**9. Pat S to provide update on instrument table and trailer plans
listing investigators and instruments.**

**10. Connor to check on archival storage capabilities at sgp.**

**11. Connor and John to discuss near real time access to AOS data
during IOP.**

**12. Rich to check on CCN comparisons at GIF.**

**13. Connor to check on and be contact person for time synchronization
software for IOP.**

**14. Rich to add agenda item at AWG meeting regarding desire for IAP to
measure aerosol properties at ambient conditions.**

**15. Pat S to ping people about aerosol size cuts.**

**16. Steve to update status on ACP participation.**

**17. (All) Submit updated (ARM) questionnaires
(<http://www.db.arm.gov/cgi-bin/IOP/SignIn.pl?person_id>=) and site
request forms
(<http://www.db.arm.gov/cgi-bin/SARS/SignIn.pl?functype=main>) and
shipment notification forms
(<http://sdsops.arm.gov/shipping/shipnote.html>).**

pat sheridan needs to let dan nelson get started moving on meeting our
reqmts so therefore needs to know our reqmts for surface facilities.

rick wagener during the IOP the archive sets up a prelim data area and
then create user accounts. [RICK to check]{.underline}.

Rich: ted intended to join. Congress has passed budget; not sure signed;
drawing up contracts and then there will be a second increment once
money is in hand. still some budget issues. some are still in limbo.

Issues of twin otter instrum and aircraft facilities. Haf says pretty
much on schedule for integration. no meeting yet w FAA or airforce
flight plans coordination [TED CRESS TO SET UP]{.underline}. Plans have
been passed to ted and doe folks. next few weeks planning meeting haf,
pilot, greenwood, air force, FAA, rich?. Haf and pilot will look at
hangar, power etc. no problems expected.

Beat asks status update for aircraft instrums:

arnott diode on its way will match tony\'s wavelength; waiting
alignment. he will integrate also for adam (Asian Dust Above Monterey)
if in time.

covert modified psap; in the lab. not adam? but will be on for arm IOP.

covert tsi neph ready to be shipped for adam

covert humid neph not part of adam but will deliver april.

strawa by beat; this or next week. not same as Reno. tight but hope to
integrate for adam. will be some lab intercomps w one in Reno and ogren
neph.

rissman seinfeld tandem DMA jay wang familiar. asks issues of foreign
nationals access to airport. [RICH NEED TO CHECK]{.underline} Access to
site issue also. John doesn\'t think a problem.

sun photometer to be integrated for adam. aats14.

MOUDI hegg/covert. part of cirpas facility. Need to know funding before
ordering filters. Still up in the air. Pete Daum says ted wanted him to
pay for it.

Pilewskie ssfr OK not adam. will be on the stabilized platform for IOP

bucholz funding OK company funded busily having platform ready by mid
march looks like ready for adam.

bucholz instrums in the works hopes to have by mid march. Kipp cm22 etc

CCN? jay wang does not know details; need to check with tracy rissman or
john seinfeld.

Dates start and duration. Rich says driven by aircraft availability. May
5 monday thru May 31 saturday. beat expects start date on 5th. 60 hours
flight time. in addn to ferry.

IAP instrums for IOP. John working on it. trying to get (humidified)
neph suitable for aircraft. hopes to get corrected.

Schwartz was asked about addl instrums for site. Most investigators for
gif trailer. Sheridan needs info. Space issue more than flow. [STEVE
needs to ping the people to get requirements]{.underline}. Sheridan has
info on splat mass spec. 2 rack DMA. Needs info on aerodyne instrum. Y
lee: pat have info on pils? Yes. Particle collector from Jim Cowin. Pat
thinks there is flexibility. [STEVE needs to ping cowin. STEVE needs to
ping Aerodyne mass spec.]{.underline}

Nelson joins. Pat and Dan fill in on mods. gnd based measmt issues:
inlet for gif trailer. Issues of who, where. Pat thinks can handle. Then
calibration issues.

Locations for PI\'s. Aerosol trailer: 30 L min Covert gets one 2d line
kirchstetter. sees no issues housing or flows. everyone else in gif.
Rich asks whether names and locations can be identified on figure. Rack
-1 kirchstetter; 3 lamda neph. Rack 2 computer instrum potentially avail
for IOP. Extinction cell 14 food hung between doors. high, out of way.
getting tubing is issue but not problem. Spaces in gif trailer not
assigned. ogren notes space is avail for instrums but flow issues.

question of shadowing from stack of gif. would be problem later in
season. will not shadow instrums on gif deck. also cleaning study
ongoing. stoffel.

joe notes that the diffuse horizontal is potentially affected. Asking
color. influence. Joe would like flat black paint.

Ogren asks whether flat black heating problem. john is talking about a
heater to make sure that air is at low RH. So heating of tube wrap stack
in silver bubble wrap and then paint black? Do if it comes to that. Has
been used before. Kept temp before per covert. Dan asks how much glint
would come off it. Joe says can do experimentally. try it on a bright
sunny day. Do it empirically. and if need to wrap, lower it and dan\'s
people wrap it.

steve asks joe after diffuse instrums. will be on guest facility. and
cavity on clear days. there are two pyrheliometers on tracker as it is
now.

distance gif to aos? \[600 ft; provided by dan nelson later, see maps at
<http://www.ops.sgp.arm.gov/drawings/cfbase.htm> and
<http://www.arm.gov/docs/sites/sgp/images/maps/sgp_cart_cf.gif>\]

rich asking pat on issues regarding gif trailer. pat calls attn to plan
on web site. need aerosol inlet and stack. dan responsible for building
the stack, 10 m pvc sewer pipe on tip up tower about 10 ft from west
wall of trailer; shading calcs based on 5 ft from wall. heater section
is 8 ft stainless section. so 10 ft better. calc was made for 5 ft. Dan
responsible for stack and plenum. Concerns over copper plenum. Dan can
get made out of stainless. Several ports. made calcs for 10 µm particles
no upper limit cut such as a cyclone; possible to get some larger. dan
responsible for stack and plenum. CMDL is responsible for RH control and
flow monitoring. pitot tube differential pressure gage, RH sensor and
PID controller heater. Planning on 40% RH air at west wall where enters
building. Insulate distribution system but nothing else. Rich asking if
any duplication of instrums. John says will be size instrums but would
require intercomp before relying on differences. Hudson will be running
DMA? Wang will have scanning DMA. Wang hoping on an opc. tsi long column
to get 800 nm to 1 µm. can change flow rate for more sensy. up to 1 µm.
Jim the same. Tom cahill goes up to 10 µm off line for chem comp, mass
and optics. transmission 50 lamda 1 hr time resolution; avail 2 wks
after field.

John wonders whether to get a tsi neph in gif trailer. pat arnott
bringing an integrating sphere and radiance neph. still some diffs
coming out of Reno with tsi neph. some of that is truncation angle. esp
large particles. No 1 µm impactor in gif trailer so size will be
potential issue. John says not possible to compare nephs if not
harmonizing RH and size. But no plan to replicate sizer in gif. Rich
still asking about comparison. But RH issue and 10µm cut. No impactor
avail for the plenum; would have to be on a line by line basis. John
notes that the 1-10µm range is only 10% of submicron. Would require
cyclone at 10µm at 200 L min-1 to do this.

Rich still asking whether some comp. can switch off the 10 µm in the
aos? John says would be half hour swap in out. John suggests potentially
useful on a dusty day. John suggests duplicate tsi neph with a cut on
it.

Jay suggests that the G-1 pcasp can compare to the opc pcasp. John says
can do another neph. Add to work stmt for ted. John uneasy about pcasp
comps unless prior running side by side. Jay asks do that prior?
possible? john concerned about particle losses at large size range. But
could sample ambient air. john says easy. only an issue of time.
calibrations in aos, gif, cirpas going to take time. days before start
of expt. Prior to May 5.

Rich notes concern whether any of the aircraft comps prior to may 5.
Sheridan avail a week before. Cant speak for others. Who would be
involved? Has sketched a general plan. comp of measmts of each instrum
type. Bring Reno aerosol generation system to hangar or trailer. still
issues of inlet loss. Generation system is white and black aerosols
mixing chamber 20 sampling ports air to multiple instrums. size range?
am sulfate number peak 0.2 -0.3 µm; soot depends on source kerosene,
diesel, carbon vane pump. Where? doubt flame in either trailer or
hangar. So would have to do it outside. Logistical issues.

Question to nelson flame in the trailer. kerosene lamp 4 inch square
candle size flame w chimney pick it off a foot above flame. Issues of
fire detection and suppression. None.

Rich asking who wants to determine who would participate in this
intercomp. Rich concerned about impact on aircraft flights. [Pat S to
canvass community]{.underline}.

Rich would like to update instrum table and plans of trailers. when
becomes known. John suggests instrums w least flow closest to wall and
most flow at end of plenum. keeps flow thru plenum more constant. John
suggests 3 pick offs right at wall and get many people and low flows and
smallest instrums there. [Pat S to provide update on instrument table
and trailer plans listing investigators and instruments.]{.underline}

Lee asks about flow. bring own pumps. so is total governed by that? John
will provide variable blower at back end of plenum but not automatic.
Manual. But requires cooperation. instead of bypasses.

Steve questioning hours of day.

Hudson may want to run 24-7; better to keep instrum going. need to check
up on it at least daily.

Rich anticipating little if any nighttime operations. questionnaire?
Rich suggests pat s list serve as check list for IOP questionnaire.
suggests that the questionnaire serve as the place for this. Rich says
possible to edit this and amend it.

Rich suggests that IOP questionnaire is the place for this. then rich
can go thru and filter this out and make a master sheet. rich referring
to the IOP questionnaire. Suggests at same time send to pat s. [Pat will
update and send to rich.]{.underline}

Wagener says section on questionnaire about data delivery. Need for
prelim data area. Some have already noted yes. So he can get up password
protected sites for these people. R-1 machine in control trailer or
access thru intranet. Rick says iop.archive.arm.gov is available there
too. Rick says archive location is better. see questionnaire. Issue of
storage space restrictions. Less than 1 gig is acceptable. Multiple
gigabites requires special arrangements. [Connor will check on local
issues regarding a gig.]{.underline}

John asks connor and rick about aos data; wants them to be accessible to
participants. Connor says grab off of xdc IOP special. John suggests
connor make procedure available. AOS unedited stream. should be avail
thru R1. Connor asking quick thruput of aos? Raw data immediately.
[Connor to ping john.]{.underline}

John: CCN comps. Caltech and DRI side by side? Hudson says one on
ground? Tracy not on call. [Rich will send email and check on
this.]{.underline} Airport? or at cart site? John doesn\'t want this to
fall thru cracks. once or twice.

Sheridan indicates that rissman will be operating out of gif; also
hudson.

Ogren suggests people know how to synchronize computers to time. Get
client software and learn how to use it. [Connor the contact
person.]{.underline}

Ogren: sample condition sizing and RH. Teom. Size cut. 2.5 in the aos
have 10 µm and 1 µm cut. Ogren asking about size cuts on otter. whatever
gets in. 5-8 µm. but IAP running with 1 µm cut.

Beat notes that goal is ambient aerosol. John raises question why
compare with iap at all.

Cahill has 2.5 and 1 µm cuts on drum. 1 hr resolution.

Beat make as close to ambient. so it is a test of what the iap is
missing. teom and pils are 2.5 µm diams.

pat arnott a switchable inlet on ground?

Rich asks whether possible on iap to remove the 1 µm inlet. easy but
rest is not optimized for large particles. disc of whether to add or
not.

question to dave about size cuts on otter.

beat reminds ambient closure, not inlets and nephs. john questioning
whether we can do comps betw aircraft.

discussion of purpose of iap.. [John suggests for agenda for broomfield
meeting.]{.underline} What want to do long term. Redesign to ambient
closure?

So remove 1 µm cut on IOP from time to time. pat says not frequent. once
or twice at beginning.

Issue of comparitabie flights. compare when possible. Don\'t swap out
the iap filter.

[Rich asks pat to ping people on their size cuts.]{.underline} Steve
suggests yinnan switch to a 1 µm cut. Pat arnott with a switchable 1µm
cut. Tom K with a switchable cut. Or after the aos impactor. yinnan to
check.

Rich reminds working group and participants for monday meeting at arm
science team meeting after lunch. as long as needed. Good time for pat
to have trailer plans. Rich will have science plan. Refer to Rich\'s
email. And any topics to be added.

Dates may 5-31 but ahead of time is available if needed.

[Steve to get right on ACP participation.]{.underline}

Nelson 600 ft between trailers. Rich notes maps on web page. But dan
says scale is not perfect. elevation difference less than a couple of
feet.

[Reminder questionnaires and advise issues to rich or mail list as
approp.]{.underline}