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Langley Research Center Report on SAGE-III scientific seminar SAGE III Project

   Scientific seminar of scientists of USA and Russia "SAGE-III Test Data Review Meeting" has been hold on 1-2 March, 2001 in St. Petersburg State University. Eleven scientists from USA participated in this seminar after the completion of the Moscow stage of the SAGE-III testing (see list of participants in Attachment 1). Scientists of Atmospheric Physics Department at St. Petersburg State University participated in the seminar from Russian side. William Chu, Alvah Moore (USA) and Yu.M. Timofeyev were put in to manage the seminar.

Participants of SAGE-III seminar
Participants of SAGE-III seminar

   Seminar Program (see Attachment 2) icluded the following items:
  1. Scientific statement of satellite experiment with the SAGE-III.
  2. Reports on testing the device.
  3. Ideology of systems of processing the measurement data of different levels.
  4. Review of scientific results in the field of remote sensing at Atmospheric Physics Department (SPbSU).
    American scientists arrived in SPbSU after long Moscow period dedicated to pre-flight SAGE-III tests. After the seminar, they returned to Moscow to complete all the program of the SAGE-III tests.

    The SAGE-III is planned to be launched in June-July 2001 in the complex of the "Meteor-3M" scientific technique.

    W.Chu gave a short characteristics of previous experiments on atmospheric sounding (aerosol, gas content) from 1975 (SAM apparatus). In Table "SAGE III Heritage" principal characteristics of different satellite experiments are given.

 SAGE III Heritage
Table 1. "SAGE III Heritage"

   Considered satellite experiments are the measurements of solar radiation passing through the atmosphere along slant paths at Sun rises or sets. The solution of relevant inverse problem gives a possibility to determine vertical profiles of the ozone and other atmospheric components and to retrieve some optical and microphysical aerosol characteristics. It will be noted that American satellite experimants of such type provides a great amount of valuable scientific information. It is necessary to pay attention on unique duration of a number of the SAM-II and SAGE-II experiments. For example, the SAGE-II has been worked from 1984 in spite of the collapse of some ERBS systems.

   In Russia similar experiments are few. In this connection we can cite the paper of K.Ya. Kondratyev et al. "Measurements of stratospheric and mesospheric water vapor mixing ratio by spectral device from orbital station "Salyut-4" (Reports of RAS, 1976, 266, 3, 563-565).

   A number of experiments with the "Ozone-Mir" device similar to SAGE-III were performed from the "Mir" Orbital Station. Principal results of this experiment were published:
  1. Poberovskii, A.V., A.V. Polyakov, Yu.M. Timofeyev et al., 1999: Determination of vertical profiles of the ozone content by the occultation method from the "MIR" Orbital Station: 1. Description of instrumentation and data processing method. Examples of results. Izv., Atm.. Ocean. Phys., 35, 3, 312-321 (Engl. transl.).
  2. Polyakov A.V., A.V. Poberovskii, Yu.M. Timofeyev, 1999: Ozone Profile Determination by Occultation Sounding from the Mir Space Station: 2. Comparison of the Observational Results with Independent Data., Izv., Atm.. Ocean. Phys., 35, 3, 322-328 (Engl. transl.).
  3. Polyakov, A.V., A.V. Vasil'ev, and Yu. M. Timofeev, 2001: Parametrization of the Spectral Dependence of the Aerosol Attenuation Coefficient in Problems of Atmospheric Occultation Sounding from Space. Izv., Atm.. Ocean. Phys., 37, 5, 646-657 (Engl. transl.).
  4. Polyakov A.V., Yu.M.Timofeev, A.V.Poberovkii, and A.V.Vasil'ev, 2001: Retrieval of Stratospheric Vertical Profiles of Aerosol Extinction Coefficients from the Ozon-Mir Measurements (Mir Space Station), Izv. RAN, Atm. and Oceanic Physics, 37, 2, 213-222.
   Scientists of different countries participate in the SAGE-III Project. Prof. A.A. Chernikov (CAO) and Prof. N.F. Elanski (OIAP RAS). The list of the SAGE-III Project scientists are given below.

Investigators

M.P. McCormick, Principal Investigator
W.P. Chu, Project Scienyist
A.A. Chernikov
D.M. Gunnold
J. DeLuisi
P.A. Durkee
N.P. Elanski
B.M. Herman
P.V. Hobbs
G. Kent
J. Lenoble/C. Brogniez
A.J. Miller
V. Mohnen
V. Ramaswamy
D. Rind
P.B. Russel
V. Saxen
E.P. Shettle
L. Thomason
C. Trepte
G. Vali
S.C. Wofsy
J.M. Zawodny
 
Affiliation

Hampton University
NASA Langley
Central Aerological Observatory
Georgia Institute of Technology
NOAA/ERL
Naval Postgraduate School
Russian Academy of Science
University of Arizona
University of Washington
Science and Technology orp.
University of Lille
NOAA NCEP
New York State University
Princeton University
NASA GISS
NASA Ames
North Carolina State University
Naval Research Lab.
NASA Langley
NASA Langley
University of Wyoming
Harvard University
NASA Langley

   Principal characteristics of the SAGE-III are: The SAGE-III design is given in Fig.1.

SAGE-III design
Fig.1. SAGE-III design


   In Table 2 principal information on atmospheric parameters planned to be determined by the SAGE-III are given.

SAGE-III Science Performance
Table 2. SAGE-III Science Performance


   The scheme illustrating the organization of the receipt, the propagation and the processing of measurement data is given.

.2
Fig.2. Meteor-3M/ SAGE-III operation


   By desire of USA scientists, SPbSU team reported some results of investigations:
  1. Timofeyev Yu.M. A review of studies in the field of remote sensing at Atmospheric Physics Department.
  2. Kostsov V.S. Retrieval of vertical temperature profiles at the 40-120 km altitudes (the interpretation of the "CRISTA" measurement data).
  3. Virolainen Ya.A. Determination of atmospheric temperature and gas characteristics from ground-based measurements of thermal radiation spectra.
  4. Ionov D.V. Results of validating the satellite measirements of O3 and NO2 total contents by the GOME device.
  5. Polyakov A.V. ) Experiment with the "Ozone-Mir" device. ) Optimal parametrization of stratospheric spectral aerosol extinction coefficient and the solution of inverse problem with respect to aerosol microphysical parameters.
   The Russian-merican seminar was successful and American colleagues acknowledged the SPbSU for holding the meeting.


Attachment 1 - list of USA participants


Attachment 2 - Seminar Programm

Proposed Agenda:

MARCH 1 Morning

SAGE III US Team Arrive in St. Petersburg


MARCH 1 Afternoon
TEST DATA REVIEW (1/2 Day)

OPENING REMARKS - (St. Petersburg State University)

INSTRUMENT READINESS
Introductions (Moore, Chu)
Overview and Expectations from review (Moore)
Review all instrument test results (Quinn, Veiga, Rawls)
Break
Review End-to-End Test results (Cisewski)
Overview of EMC/EMI test plan (Rawls)
NFR's/Resolutions (Hayhurst)
Review of Day 2's Agenda / Closing (Moore)
MARCH 2 - (1/2 Day)
PRE-SHIP STATUS
Status of logistics/materials/equipment (Rawls)
Shipping Plan and Activities (Rawls)
Open issues (All)
Closing remarks (Moore/Chu)
Dismiss I&T Team
SCIENCE DATA OVERVIEW
SAGE III Radiometric Calibration and Test Data (Chu)
Ozon-Mir Occultation Experiments and Validation Programs (SPSU)
MARCH 3, 4
SAGE III US Team Members Non Work Days

MARCH 5
SAGE III US Team Members Return to Moscow



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