# Curriculum Vitae -- A. Gannet Hallar

National Research Council Associate

NASA Ames Research Center

Mail Stop 245-4

Moffett Field, CA 94035

ahallar@mail.arc.nasa.gov

## Education

**B.A.** Physics, Truman State University, Kirksville, Missouri

Minor: Mathematics

Graduation: May 1999

**M.S.** Atmospheric and Oceanic Sciences, University of Colorado at
Boulder

Graduation: May 2001

**Ph.D**. Atmospheric and Oceanic Sciences, University of Colorado at
Boulder

Graduation: December 2003

> Title of dissertation: "Use of Tunable Diode Laser Closed Path
> Hygrometer for the Measurement of Total Water in Tropopause Cirrus"

## Awards/Honors Received

CO- Principal Investigator for Proposal titled "Climatic Studies of Thin
Cirrus coupled with the Validation of Aura

> Detection of Upper Tropospheric and Stratospheric Clouds using Solar
> Occultation Data" funded by National Aeronautics and Space
> Administration Aura Validation Research Announcement

National Academy of Sciences Postdoctoral Research Fellowship-February
2004 - Present

University of Colorado at Boulder, Program in Atmospheric and Oceanic
Science

Graduate Student Research Fellowship -- August 1999 to December 2003

Graduate Student Travel Grant for European Geophysical Society Meeting
in France -- February 2003

National Aeronautics and Space Administration Group Achievement Award --
CRYSTAL-FACE -- 2003

Truman State University

President's Combined Ability Scholarship -- 1995 to 1999

Dean's List - four semesters (Overall GPA = 3.5)

Truman State University Alumni Department

Details of Award: Eugene Smith Physics Scholarship -- 1997

Cardinal Key National Service Honor Society

Inducted as a member -- 1997

Elected President -- 1998

Truman State Society of Physics Students

Elected President -- 1998

#### [Professional Experience]{.underline}

Postdoctoral Research Associate\-- NASA Ames Research Center, Moffett
Field, CA

February 2004 - Present

-   Advisor: Dr. Anthony Strawa

-   Research with Atmospheric Aerosol Optical Instrument using
    Cavity-Ring-Down Optical Sensing Technique

-   Extensive Data Analysis with IGOR

-   Prepared proposals for research funding from NASA, NSF, ARM, and
    NOAA

-   Solely responsible for instrument during several field projects

-   Created Calibration System Design and Procedure

-   Supervised two research assistants

-   Presented at National and International Research Conferences

*Anna Gannet Hallar -- Pg. 2*

[Professional Experience Continued]{.underline}

Job Title: Graduate Research Assistant --

University of Colorado at Boulder, Laboratory for Atmospheric and Space
Physics,

August 1999 -- December 2003

-   Advisor: Dr. Linnea Avallone

-   Research with Tunable Diode Laser Atmospheric Trace Gas Instruments

-   Analysis of sub-isokinetic inlet system for airborne total water
    measurements

-   Created new data analysis process from raw pp2f laser signal for in
    situ measurements based calibration data

-   Conducted study of Stratosphere/Troposphere Exchange in the
    Sub-Tropics

-   Analyze data with Interactive Data Language (IDL) and Origin

-   Prepared proposals for research funding from NSF, NASA, and EPA

-   Experienced over six months of field research

-   Presented at National and International Research Conferences

Graduate Teaching Assistant - University of Colorado at Boulder, Program
in Atmospheric and Oceanic Studies

December 2003 -- May 2003

-   Supervised by Dr. Tom Warner

-   Solely responsible for several lectures, proctored exams, graded
    exams

Undergraduate Teacher's Assistant multidisciplinary course titled
"Physics for Poets"

Department of Physics at Truman State University, Kirksville, MO

August 1996 to May 1999

-   Supervised by Dr. Ken Hahn

-   Organized and conducted recitations, graded homework, tests, and lab
    reports each week

Student Volunteer for National Weather Service, Weather Forecasting
Office in Pleasant Hill, MO

Date: June- August 1998 (40 hours per week)

-   Supervised by Peter Browning -- Science and Operations Office

-   Exposed to AWIPS, ASOS, NOAA Weather Radio (CRS) and Doppler Radar

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-   Visited a Kansas City Television Meteorologist, a Skywarn
    Educational Seminar, and an ASOS site

-   Created a Severe Weather Climatology Web-Page

#### 

Undergraduate Research Assistant Truman State, University Physics
Department, Kirksville, MO

May --August 1999

-   Researched the Theory of Chaos as it applies to Diode Lasers

-   Mentor: Dr. David Chyba,

#### 

#### [Field Studies]{.underline}

**MArine Stratus Radiation Aerosol and Drizzle (MASRAD) -- Point Reyes,
CA: July-August 2005**

In situ measurements to study relationship between aerosol particles and
cloud droplet properties

**Atmospheric Brown Cloud - Post Monsoon EXperiment (APMEX) -- Maldives,
Indian Ocean: Oct-Nov 2004**

Ground site in situ measurements of aerosol optical properties to study
pollution transport

**Caldecott Tunnel -- Black Carbon Investigation: Oakland, CA: June
2004**

In situ measurements of the aerosol optical properties of vehicle
emission inside traffic tunnel

**Extended -- MODIS -- λ Validation Experiment, Marina, CA: April -- May
2004**

In situ measurement of extinction and scattering at 675 and 1550 nm
aboard CIRPAS Twin Otter

**Winter Fly-in (Winfly) 2002, McMurdo, Antarctica:** **August-November
2002**

Ground-based in situ measurements of ClO, BrO, NO, NO~2~, and O~3~ to
study boundary layer ozone depletion

**Cirrus Regional Study of Tropical Anvils and Layers Experiment
(CRYSTAL-FACE), Key West, Fl:** **July 2002**

In situ measurements of cirrus cloud total water from NASA WB-57
aircraft

**Instrumentation Development and Education in Airborne Science (IDEAS),
Broomfield, CO:** **April 2002**

In situ measurements of H~2~O - Counter Flow Virtual Impactor from NCAR
C-130 aircraft mentored by Dr. Cynthia Twohy

*Anna Gannet Hallar Pg. 3*

[Professional Service]{.underline}

2000-2005 Member, American Geophysical Union

2001-2005 Member, American Meteorological Society

2004 Conducted Laboratory Training for students of the Atmospheric Brown
Cloud Training School,

Hanimaadhoo, Maldives, Oct 9-14

2005 Reviewer of Proposals for NASA Tropical Cloud Systems and Processes
(TCSP) mission

2005 Seminar Director for Earth Science Division at NASA Ames Research
Center

2005 Reviewer of Proposals for Instrument Working Group of NASA Ames
Research Center

[Publications]{.underline}

[Peer-Reviewed Journal Articles]{.underline}

A.G. Hallar, L.M. Avallone, R.L. Herman, B.E. Anderson, and A.J.
Heymsfield, **2004**, Measurements of ice water content in tropopause
region arctic cirrus during the SAGE III Ozone Loss and Validation
Experiment (SOLVE), *J. Geophys. Res*.,109 (D17203) doi
10.1029/2003JD004348.

A.G. Hallar, , A.W. Strawa, B. Schmid, E. Andrews, J.Ogren, P.Sheridan,
R. Ferrare, D.Covert, R. Elleman, H. Jonsson, K. Bokarius, A. Luu,
**2005,** ARM Aerosol Intensive Operating Period: Comparison of aerosol
scattering during coordinated flights, *J.Geophys. Res*, accepted, doi:
2005JD006250RR.

Y. Kondo, O.B. Toon, H. Irie, B. Gamblin, M. Koike, N. Takegawa, M.A.
Tolbert, P.K. Hudson, A.A. Viggiano, L.M.

Avallone, A.G. Hallar, B.E. Anderson, G.W. Sachse, D.E. Hunton, J.O.
Balentine, and T.M. Miller, **2003**, Uptake of nitric acid on cirrus
cloud particles in the upper troposphere and lowermost stratosphere,
*Geophys. Res Lett*. 30 (4), doi:10.1029/2002GL016539

B.F. Thornton, D.W. Toohey, L.M. Avallone, A. G. Hallar, H. Harder, M.
Martinez, J. B. Simpas, W. H. Brune, M. Koike, Y.Kondo, and N.
Takegawa**, 2005**, Mechanism of chlorine activation near the winter
Arctic tropopause, *J. Geophys. Res*., 110, D22304,
doi:10.1029/2004JD005580.

A.W. Strawa, R. Elleman, A.G. Hallar, D. Covert, K. Ricci, R. Provencal,
T. Owano, H. Jonsson, B. Schmid, A. Luu, K. Bokarius, E. Andrews,
**2005**, In-Situ Measurement of Aerosol Optical Properties Made During
the DOE Aerosol IOP: 1. Comparison of Extinction and Scattering
Coefficients, J. Geophy. Res., Accepted, doi: 2005JD006056.

B. Schmid, R. Ferrare, C. Flynn, R. Elleman, D. Covert, A. Strawa, E.
Welton, D. Turner, H. Jonsson, J. Redemann, J. Eilers, K. Ricci, A. G.
Hallar, M. Clayton, J. Michalsky, A. Smirnov, B. Holben, J. Barnard,
**2005**, How well can we measure the vertical profile of tropospheric
aerosol extinction?, *J. Geophys. Res*., Accepted, doi: 2005JD005837.

J. Lopez, A. Fridlind, H-J Jost, M. Loewenstein, A. Ackerman, T. Campos,
E. Weinstock, D. Sayres, J.B.Smith, J. Pittman, A. Hallar, L. Avallone,
S. Davis, R. Herman, **2005,** CO signatures in subtropical convective
clouds and anvils during CRYSTAL-FACE: Constraining entrainment rates
with observations, *J. Geophys. Res*, Accepted, doi: 2005JD006104.

S. Davis, A. G. Hallar, L. M.Avallone, T. Campos, B. Engblom, **2005**,
Measurements of Ice Water Content with a Tunable Diode Laser Hygrometer:
Calibration Procedure and Inlet Analysis, Journal of Atmospheric and
Oceanic Technology, manuscript submitted.

[Other Publications]{.underline}

A.W. Strawa, A.G. Hallar, R. Castaneda, K. Ricci, A. P. Luu, R.
Provencal, A. Bucholtz, B. Schmid,  D. Covert,  R.Elleman, W.P. Arnott;
Cavity Ring Down Measurement of Aerosol Scattering, Extinction, and
Absorption during DOE Aerosol Intensive Operating Period; Manuscript
presented at Air and Waste Management Conference, April **2004**,
Research Triangle Park, NC.

A.G. Hallar and A.W. Strawa, In situ Measurements of Aerosol Optical
Properties With An Emphasis on Spectral Properties of Carbonaceous
Aerosols, Proceedings SOFIA Upper Deck Science Opportunities Workshop,
NASA Ames Research Center, Moffett Field, CA, June 22-23, **2004**.

> *Anna Gannet Hallar Pg. 4*

[Invited Talks]{.underline}

A. G. Hallar and L.M. Avallone, What we learned from CRYSTAL-FACE;
Measurement of Thin Cirrus via Closed Path Tunable Diode Laser
Hygrometer, invited talk NASA AMES Research Center; Moffett Field, CA,
August 3, 2003.

[Talks/Meeting Abstracts]{.underline}

A.G. Hallar, A.W. Strawa, T.W. Kirchstetter, R. A. Harley, K. Bokarius;
In-Situ Measurements of Aerosols from Motor Vehicles in the Caldecott
Tunnel, Presentation at American Geophysical Union Fall Meeting, San
Francisco, CA, December **2005**.

A.G. Hallar, A.W. Strawa, T.W. Kirchstetter, R. A. Harley, K. Bokarius;
In-Situ Measurements of Aerosols from Motor Vehicles in the Caldecott
Tunnel, Presentation at American Association for Aerosol Research
Conference, Austin, TX, October **2005**.

A.G. Hallar, A.W. Strawa, T.W. Kirchstetter, R. A. Harley, R.Castaneda,
K. Bokarius, A. P. Luu, In-Situ Measurements of Aerosols within the
Caldecott Traffic Tunnel, Presentation at European Aerosol Conference,
Ghent, Belgium, September **2005**.

A.G. Hallar, A.W.Strawa, B. Schmid, E. Andrews, J. Ogren, R. Ferrare, D.
Covert, R. Elleman, Comparison Study of Optical Properties During the
Aerosol IOP from Mulitple Aircraft Platforms, Poster presented at the
Atmospheric Radiations Measurement (ARM) Science Team Meeting, Dayton
Beach, FL, March **2005**.

A.G. Hallar, A.W. Strawa, D. Covert, H. Jonsson, TW Kirchsteatter, B
Schmid, A P Luu, J Redemann, K Bokarius, In-Situ Measurements of Aerosol
Optical Properties using New Cavity Ring Down - Results From Two Recent
Field Missions, talk presented at the American Geophysical Union
Meeting, December **2004**.

A.G. Hallar, L.M. Avallone, R.L. Herman, and T. Campos, Measurements of
Ice Water Content using closed path tunable diode laser hygrometer,
poster presented at EGS Meeting, Nice, France; April **2003**.

A.G. Hallar, L.M. Avallone, R.L. Herman, and T.J. Garrett, Contrast and
Comparisons of *in situ* measurements of IWC, extinction, and size
distributions during two cirrus cloud case studies (7/9/2002 and
7/11/2002), poster presented at Crystal Face Science Team Meeting, Salt
Lake City, Utah; February **2003**.

A.G. Hallar, L.M. Avallone, R.L. Herman, B.E. Anderson, A.J. Heymsfield,
Measurements of Ice Water Content in Tropopause Arctic Cirrus during
SOLVE (SAGE III Ozone Loss and Validation Experiment), talk presented at
American Geophysical Union Spring Meeting, San Francisco; December
**2002**.

[Co-Authored Talks]{.underline}

B. Schmid, R. Ferrare, C. Flynn, R. Elleman, D. Covert, A. Strawa, E.
Welton, D. Turner, H. Jonsson, J. Redemann, J. Eilers, K. Ricci, A. G.
Hallar, M. Clayton, J. Michalsky, A. Smirnov, B. Holben, J. Barnard. How
well can we measure the vertical profile of tropospheric aerosol
extinction? European Aerosol Conference , Ghent , Belgium, Aug 28 - Sept
2, **2005**

B. Schmid , R. Ferrare, C. Flynn, R. Elleman, D. Covert, A. Strawa, E.
Welton, D. Turner, H. Jonsson, J. Redemann, J. Eilers, K. Ricci, A. G.
Hallar, M. Clayton, J. Michalsky, A. Smirnov, B. Holben, J. Barnard. How
well can we measure the vertical profile of tropospheric aerosol
extinction? Talk Presented at ARM Science Team Meeting, Dayton, FL.
March **2005**

A.W. Strawa, A.G. Hallar, R. Castaneda, K. Ricci, R. Provencal, A.
Bucholtz, B. Schmid,  D. Covert,  R.Elleman, W.P. Arnott; Cavity Ring
Down Measurement of Aerosol Scattering, Extinction, and Absorption
during DOE Aerosol Intensive Operating Period, poster presented at the
Aerosol Radiation Measurement Science Team Meeting, Dayton FL. March
**2005**.

A.W. Strawa, A.G. Hallar, A.P. Arnott, R. Elleman, D. Covert, J. Ogren,
B. Schmid, J. Redemann, A. Bucholtz, H.H. Jonnson; In-Situ Measurements
of Aerosol Optical and Physical Properties, presented at the European
Aerosol Conference, Ghent, Belgium, September **2005.**

A.W. Strawa, A.G. Hallar, A.P. Arnott, R. Elleman, D. Covert, J. Ogren,
B. Schmid, J. Redemann, A. Bucholtz, H.H. Jonsson,

C. Corrigan, In-Situ Measurements of Aerosol Optical and Physical
Properties, presented at the AAAR Annual Conference, Austin, Texas,
October, **2005**

A. J. Heymsfield, A. Bansemer, C. Schmitt, D. Baumgardner, M. Poellot,
C. Twohy, E. Weinstock, J. Smith, L. M. Avallone, A. G. Hallar and R. P.
Lawson, Properties of Tropical Convectively Generated Cirrus, 14^th^
International Conference on Clouds and Precipitation, Bologna, Italy,
July **2004**.

T. Kirchstetter, A. W. Strawa, A. G. Hallar, R. Harley, G. Kendall, J.
Hesson, E. Stevenson, A. Miguel, Characterization of Particle and Gas
Phase Pollutant Emissions from Heavy and Light Duty Vehicles in a
California Roadway Tunnel, Poster Presented at American Geophysical
Union Meeting, December **2004**.

*Anna Gannet Hallar Pg. 5*

A.W. Strawa, A. G. Hallar, D. Coverty, R. Ellleman, R. A. Ferrare, H.
Jonsson, A. P. Luu, J. Ogren, K. Ricci, B. Schmid, P. Arnott, R.
Castaneda, In-Situ Measurements of Aerosol Optical Properties using new
Cavity Ring Down and Photoacoustic Instruments and Comparisons with more
Traditional Techniques, Poster presented at the American Geophysical
Union Meeting, December **2004**.

B. Schmid., R. Ferrare, C. Flynn, R. Elleman, D. Covert, A. Strawa, E.
Welton, J. Barnard, M. Bartholomew, M. Clayton, J. Eilers, G. Hallar, B.
Holben, H. Jonsson, J. Michalsky, J. Redemann, K. Ricci, A. Smirnov, D.
Turner. How well can we measure the vertical profile of aerosol
extinction? ARM Aerosol IOP and Working Group Meeting , Boulder , CO,
December, **2004** .

[Talks/Meeting Abstracts Continued]{.underline}

A.W. Strawa, A.G. Hallar, R. Castaneda, K. Ricci, R. Provencal, A.
Bucholtz, B. Schmid , D. Covert, R. Elleman, W.P. Arnott. Cavity Ring
Down Measurement of Aerosol Scattering, Extinction, and Absorption
during DOE Aerosol Intensive Operating Period. ARM Science Team Meeting,
March 22 -- 26, Albuquerque , New Mexico, **2004** .

A.W. Strawa, P. Arnott, D. Covert, R. Elleman, R. Ferrare , A.G. Hallar,
H. Jonsson, T. W. Kirchstetter, A. P. Luu, J. Ogren, K. Ricci , B.
Schmid , T. Novakov, In-Situ Measurements of Aerosol Optical Properties
Using New Cavity Ring-Down and Photoacoustic Instruments and Comparisons
with More Traditional Techniques. International Conference on
Carbonaceous Particles in the Atmosphere, Vienna , September 14 -16,
**2004**.

A. W. Strawa,, A.G. Hallar, W.P. Arnott, D. Covert, R. Elleman, J.
Ogren, B. Schmid , A. Luu. A Comparison of Aerosol Optical Property
Measurements Made During the DOE Aerosol Intensive Operating Period and
Their Effects on Regional Climate. 2004 AAAR Annual Conference, Atlanta
, Georgia , October 4-8, **2004** .

L.M. Avallone and A. G. Hallar, Measurements of ice water content in low
latitude cirrus clouds, poster presented at the American Geophysical
Union Meeting, San Francisco, CA. December **2003.**

A. J. Heymsfield, D. Baumgardner, M. Poellot, C. Twohy, E. Weinstock, J.
Smith, D. Sayrers, L. M. Avallone, A. G. Hallar, Tropical Anvil Cirrus
Microphyscis, Talk Presented at American Geophysical Union Meeting, San
Francisco, CA, December **2003**.

L.M. Avallone and A.G. Hallar, Trace gas correlations in the tropopause
region as observed from the NASA DC-8 during SOLVE, talk and poster
presented at the SOLVE-THESEO Science Team Meeting, Palermo, Italy;
September **2000.**

L.M. Avallone, A.M. Gates, and A.G. Hallar, Trace gas correlations near
the high-latitude tropopause with measurements from a new suite of
instruments, talk presented at the Spring American Geophysical Union
Meeting, Boston, MA; May **2001**.

L.M. Avallone, A.M. Gates, and A.G. Hallar, Trace gas correlations near
the high-latitude tropopause with measurements from a new suite of
instruments, talk presented at the International Association of
Meteorology and Atmospheric Sciences (IAMAS) Meeting, Innsbruck,
Austria; July **2001.**