PRELIMINARY VERSION. THIS SET OF NOTES WILL BE REPLACED BY AN EDITED
VERSION SHORTLY

12-11-02

ARM IOP meeting

Ferrare, Schmid, Jonsson, Strawa, Gautier, Redemann, Liljegren,
Feingold, Gahn, Eilers, Voyles, Penner, Arnott, Sheridan, ??, Schwartz,
Pilewskie, Bucholtz, Ji, Risman, Cress, Flynn, Kirchstetter, Kinne, ??,
??, ??, ??

Brief Presentations

Ferrare: Overview

Gahn Indirect

Feingold Indirect by Raman.

Schwartz sfc chem and microphysics

Sheridan on Reno expt

Sheridan on aos measmts

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Schwartz asks and it is confirmed that pmel is doing daily chem analyses

Pat S is surprised over the teom

discussion over time resolution of kirchstetter measmts

Pat needs to talk to Wang

Pat notes need to make decisions pretty soon.

Discussion of Cahill size resolved composition. Rich says might come to
show what he can do, and then to make analysis. Can we pay travel costs?
Had a series at ace asia. minimal requirements. 3 hour resolution.

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Jack Ji gsfc: SMART instrument suite. reporting on radiation
instruments. New sun and sky photometer faster than cimel. Hopes to
bring trailer out to sgp. gases: NO2. Particle sizer. Second trailer.
manpower concerns.

Schwartz notes need for NO2.

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Hudson on DRI CCN spectrometers. Expects 2 instruments. one from 1% to
0.01%; one from .1% to .01%. Expects fairly high concs at arm site. has
extended to 0.002% equiv to 1 µm salt particle.

hudson speaks to using a classifier before the ccn spectrometer

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Arnott: photoacoustic ground based unit ready. possible get crd and neph
all at 532; he can also measure NO2. distinguish by inlet switching with
filter; can get at 0.3 ppb.

aircraft wants to work at 675 nm;

arnott has calc dwell time at altitude to make his measmts. would need
10 min avg time to get signal at 4 km. suggests 10 points requd.

ITEM FOR DISCUSSION: time on leg.

Mission Plans up and going. People send draft mission plans to Rich.
Rich and Jens to Draft and post on web site. Prior to jan 8.

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Strawa CRD. designed for aircraft. speaks to discrepancies at reno expt.
All the CRD\'s agree w one another and 9-15% below scat plus absorption.
suggests a mystery. hopes to study further in lab in January. Maybe
related to sampling or wavelength.

\-\-\-\-\--

Bucholtz aircraft radiometers. platform issue not resolved.

Pilewskie: net flux radiometers. worked fine in November. stabilization
issues.

Beat on sun photometers. flux divergence. concern over stabilized
platform at low aerosol optical depth errors in flux divergence. hopes
will happen.

jonsson cirpas package. issues of how to set knobs of instrums to meet
project objectives. channel boundaries. issue of convert pulse to
diameter for index 1.3 to 1.7 gives a factor of 4 in diameter from
backscatter fraction of caps. So limited utility. much narrower in
forward scatter. 50% unc in size. caps is ambient; pcasp is dry. fssp
also has a choice of ranges. depends on gain limit range to 16 µm. how
switchable. easy. before flight; maybe in flight. pcasp is pretty tight
on ref index. possible to infer ref index? get qual idea of ref index -
higher or lower than 1.45. also APS aerodynamic; inlet; not ambient; cut
at 10

m down to 0.5.

\-\-\-\--

Tracey Risman (caltech) CCN. Instrum description 3 supersat 0.2, 0.5,
0.7 based on crystal face instrums. shows results and calibration
instrums. will have old instrum on the ground. ISSUE of facilities
requirements. One supersaturation. Needs decision where to be set.

Covert not present; has associates who will be at site.

\-\-\-\-\-\--

Possible proteus involvement for a week. Addl funds could expand. Too
early to say. Cress notes financial problems. Logistics? Ted says
greenwood is flexible; does not anticipate problem at that end.

could the stabilized platform be moved? No info. ACTION follow up with
bolton on funding and moving platform. Cress to start on this. Platforms
not identical; may involve aircraft mods, and FAA approvals. they are
trying to make platform more robust as it is.

BREAK

Logistics. Haf Jonnson. Sketch of cirpas cabin. baseline instrums. data
system.

will borrow lwc probe. says has a mount for a moudi. daq gives screen
for flight scientist. data via satcom to ground. ISSUE of satellite
coverage. Need to check out. they have computer at ground talking to the
plane. Network on ground will give same window as on aircraft. has chat
capability. Better than phone because of noise on plane. MOUDI\'S 8 sets
of 6 filters. Switchable in flight; ISSUE who will use analyze?

Haf is willing to fly, or one of our group. Need some training. Agreed
for Haf to be the flight scientist; Beat as back up.

Suggests need to integrate prior to March and test. Haf send rack to
tony, pat arnott. Standard 19 x 24 inch rack. pull out of your rack and
put in Haf\'s. Possible vibration insulation of insts on rack. Little
shock absorbers.

Issue of computers on aircraft. hard drives are rated to 10000 ft. Prob
of crash increases with low pressure and vibration. Haf has gone to
flash disks? Pat says no problems at 12000 on laptops. Beat as well.

Rich asks about doe safety review. Ted replies unique circumstance. US
navy owned aircraft exempts from doe review. DOE review has been done.
No problems.

Ground ops requirements: Scientists hands off for one hour prior to
launch; hands on is prior to the hands off. Crew member must be present
when scientist needs access. Power from land lines; keep things running
till take off.

NEED TO TALK ABOUT aircraft and site visit. Ted wants meeting with vance
and FAA needs aircraft person along. Requires pilot, Beat. Will need a
set of flight plans. Need to be reviewed by doe safety committee.
Approvals requd. Then constrained to these. Flight plans require safety,
deconflicted. No night flights; Whiteman not participating. Graham might
want night flights if clouds there and not otherwise. We are free of
vance below 7000.

Below 1000 ft? Want to go to 300 ft AGL. Pat S has list of obstacles.

Coordination with Proteus? Keep it high.

flight hours 60 total 12-15 @ 4 hrs, with 3-5 coordinated flights with
iap. 2/3 for clear sky; 1/3 for cloud.

Need to prescribe altitudes for intercomps. Need to specify leg
durations. question of whether iap aircraft has duration.

Disc of moudi. Need 15 min. Who to analyze? single filter instead of
stack. Wont know comp

Legs: not straight. will be racetracks or the like. ted notes
obstructions. Jens notes concern of hitting own exhaust.

Rich notes issues of bank angle. need to stay in same compositional air
for arnott. arnott hoping for more laser power. Pat sheridan says fly
crosswind.

Graham wants non precip bdy layer clouds Cu or Sc, wants some
convection. Disc of flight patterns, sampling. Doesnt want some advected
in stratus. Go over SGP to get remote sensing info. Wants pdf\'s of
aerosol and cloud. Sub cloud and in cloud. Wants column. Ted says need
to settle on some numbers. Bring flight profiles to meeting. then need
doe review. ACTION ITEM Get your flight plans to rich so we have a set
of canned plans. Rich to take lead. Jens work with. Make revs and put on
web page. Jens suggests run by the pilot. Mike. Haf says he is willing
to talk. Need a menu. Sometimes one sometimes another, or compromise?

Ted suggests see arese science plan available on the web mission 1, 4,
etc.

\-\-\-\-\--

Ted reviews the participant questionnaire. stresses its importance.

Discussion of extra sondes. Standard is 4 x per day. Rich notes imptce
of vertical profiles. extra sonde @\$200.

Rich needs to get the ball rolling on questionnaire. On the arm web
page. Forms and procedures.

Tony notes need to discuss inlets.

Liljegren notes site and safety issues.

\-\-\-\-\--

Pat 60 l/min flow available. 19\" rack space. 30 inches deep. Maybe get
dave covert\'s long path instrum ok 14 ft.

Need to set deadline for participants to commit. Pat wants to see it
sooner than later. Possibly using addl trailer or guest instrum
facility.

Sees issue of need to get same elevation of aerosol above sfc. he
samples at 10 m and 2m is of problematic comparability. Need stack.
Pumps. Can make stack: little bit of time effort and money.

Need details of flows, instrum size. Pat needs to have this info.

Ted notes that a new stack requires logistics and safety issues; doesnt
see as a big deal.

Pat needs some baseline change requests. Permanent mods. Issue of who
pays.

Deadlines.

Need to decide if stack can be put on the guest investigtor facility. If
yes, then seems to go there. issues of interference. Michalsky RSS. Jim
says not there. Beat thinks his stuff is there. So prob not an
interference problem. ACTION touch base w joe. liljegren

DEADLINE Pat says Jan 15 for questionnaire. Steve says need to allow for
later, but jan 15 if you want to be sure you have a bearth on the boat.

Concensus to go with Utility Van near AOS? Comparable size to AOS.
Arnott needs about 2 racks worth of space. Hudson comparable. Aerosol
Mass spec comparable again. Has ports to accommodate flows.

\-\-\-\-\--

Discussion of intercomps prior to the project. Calibration studies w
synthetic aerosols like at reno. Sfc and aircraft. Pat says budget a
couple of days for this.

Rich notes constraints. budget. Not part of the orig plan. cost,
prioritization. De-integrating instruments off aircraft? or just the gnd
based instrums. Bring generator to the aircraft. Or use the PSAP as a
transferable standard. PSAP off of iap aircraft. tony asks about impact
on flight schedule. Do it on down days? Lots of discussion. Inlet
discussion. Limits on personnel times to do this. How long to do? Hours.
How long to set up?

ACTION FOR PAT Need to duplicate splitter between 1 µm and 10 µm on
Utility Van (U-Van) system.

\-\-\-\-\--

Logistics and the like. Beat is collecting info from people. Table of
people in the field.

Limited space at Ponca Airport. Issue of whether we need more space.
Instrument room? Internet connections? Ted notes that the hangar is
pretty well wired for internet access. Phone access? Haf notes they need
two phones. one for pilots, one for satcom. We will write a contract
with our requirements.

Sandia brought along their troops to do networking. Jimmy says they can
set up a network. Haf sets up a local area network. Greenwood on cable.
Need to set up with local ISP? Ted thinks that greenwood can supply.
Issue of personnel and hardware. Guy Wilcox. TED make sure get into
contract.

Issue of Met support. Haf no particular requirement. Haf needs flight
plan the day before. Then can scrub any time. Pilots file 2 hours
before. Their clock starts running then. Need 12 hour rest peroid betw
flights. Don\'t push more than 5 flights a week. Two on one off is good.
Two a day if necessary.

Daily calendar. Morning briefing 8 or 9 am. Take off no earlier than 10
am; back at latest by 7 pm. Post flight meeting. or evening.

Weather support. Rich can forecast. Not there the whole time. Site
Scientist team can provide support. Don Bond volunteers to do briefings
at least some of the time. ARM subscribes to private service. On
previous occasions ARM has set up web pages with forecasts.

Max SZA? 70 degrees.

Coordination with satellite overpasses?

Need regular coordination with faa and vance. person should not be too
distracted by other things. pilot ok. Brian Cairns may come; need to
encompass him too. Proteus too.

\-\-\-\-\-\--

Potential site visits? Rich suggests anyone bringing an instrument out
visit prior.

Will be an aerosol working group meeting on monday of the ARM science
team. Rich suggests 9 am on the monday to avoid conflict with other
working groups.

\-\-\-\-\--

Data policy: prelim as early as possible; final by 6 months. Rich
suggests 1 year. Some concerns over data that need a lot of processing.
PIs should be be offered acknowledgment to coauthor. Refer to data
sharing policy of arm. Any comments send to ted.

\-\-\-\-\--

Tom Kirchstetter shows results from wavelength dependence of absorption.
Are there filter artifacts? Or is this characteristic of the aerosol?
Indication that uv absorption is due to soluble organics.

\-\-\--

Tony asks about angle of attack issues.

\-\-\-\-\--

Ted notes that this is a pretty complex iop more than most. planning
issues. Sees elements in motion. No problems unless congress gives us
problems. Keep eye on web site. Be real critical: do we have planning
and support in place.

ACTION Rich needs to get a list of who is coming. what requirements will
be.

ACTION to pat to get cost to ted for modifiying the interior of the aos
and cost of a second stack.

ACTION item to all to fill out questionnaires.

ACTION Pat and Pat and Tony to write up inlet and intercomparison issues

ACTION Anyone with requirement for sondes should advise Rich by Jan 8

ACTION ITEM identify critical and subcritical instruments.

ACTION identify required met conditions as part of mission statement.

People who have requirments but not assoc with particular aircraft
instrums should let us know.

ACTION JIM need a floorplan of the uvan.

TED set up jan meeting with FAA.

RICH to roll out finished plan at science team meeting.

STEVE let ted? know about the existence of this web page; make link to
it.