Global Tropospheric Experiment Pacific Exploratory Mission-Tropics B (GTE PEM Tropics B) Langley ASDC Data Set Document
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Global Tropospheric Experiment Pacific Exploratory Mission-Tropics B (GTE PEM Tropics B) Langley ASDC Data Set Document |
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This document provides information on data products obtained during the GTE Pacific Exploratory Mission-Tropics B atmospheric science expedition conducted over the tropical Pacific during March and April 1999. The objectives of the mission were (1) to obtain baseline data for chemical species that determine the oxidizing power and aerosol loading of the tropical Pacific and (2) to evaluate the chemical and dynamic factors controlling ozone, OH, and aerosol levels over this remote region. Measurements were made primarily by investigators' instruments located on the NASA DFRC DC-8 aircraft with flights originating from Hawaii, Papeete, Tahiti, Easter Island, and Nadi, Fiji, and the WFF P-3B aircraft, with flights originating from Christmas Island and Papeete, Tahiti. Also provided are a list of principal investigators, a brief summary of measurement techniques and a list of publications.
This document provides information for the following PEM Tropics B data sets: (XX indicates the DC-8 or P-3B flight number.)
| gte_pemtb_dc8mXX.zip: | Aircraft Data |
| gte_pemtb_dc8trajmXX.zip: | Backward Air Mass Trajectories Associated With The DC-8 Flights |
| gte_pemtb_sgfvpdXX.zip: | Fast Response H2O Measurements |
| gte_pemtb_merge_dXX.zip: | Merged data files |
| gte_pemtb_dc8_sat_trkm06.zip: | Selected Satellite Images with DC-8 Aircraft Flight Track |
| gte_pemtb_p3mXX.zip: | Aircraft Data |
| gte_pemtb_p3btrajmXX.zip: | Backward Air Mass Trajectories Associated With the P-3B Flights |
| gte_pemtb_merge_pXX.zip: | Merged data files |
| gte_pemtb_sat_trk_p3bmXX.zip: | Selected Satellite Images with P3-B Aircraft Flight Track |
| gte_pemtb_ozonesondes_as.zip: | Ozone Sondes Launched From American Samoa |
| gte_pemtb_ozonesondes_nz.zip: | Ozone Sondes Launched From New Zealand |
| gte_pemtb_ozonesondes_ta.zip: | Ozone Sondes Launched From Tahiti |
| gte_pemtb_ozonesondes_fj.zip: | Ozone Sondes Launched From Fiji |
| gte_pemtb_sst_1999_mmdd_MMDD.zip: | Equatorial Pacific Sea Surface Temperature Analysis for time period from month mm and day dd to month MM day DD |
| gte_pemtb_g10ir_1999_mmdd.zip: | GOES-10 IR Satellite Images for month mm and day dd |
| gte_pemtb_g10_wv_1999_mmdd.zip: | GOES-10 Water Vapor Satellite Images for month mm and day dd |
| gte_pemtb_lis_march1999.zip: | LIS Lightning for March, 1999 |
| gte_pemtb_lis_april1999.zip: | LIS Lightning for April, 1999 |
| gte_ptb_fsu_trajectory_image_1999mmdd.zip: | Large Scale Trajectory Maps for month mm and day dd |
| gte_ptb_fsu_model_traj_1999mmdd.zip: | Tabulated results for large scale trajectory analysis; month mm and day dd |
| gte_ptb_fsu_model_rain_1999mmdd.zip: | Precipitation Analysis and Forecast for month mm and day dd |
| gte_ptb_fsu_model_uvw_1999mmdd.zip: | Analysis and Forecast of UWV-wind velocities components for month mm and day dd |
| gte_ptb_fsu_cloudcover_image_1999mmdd.zip: | Percentage Cloud Cover Maps for month mm and day dd |
| gte_ptb_fsu_streamlines_image_1999mmdd.zip: | Streamline Maps for month mm and day dd |
NASA funded the investigators involved in the PEM Tropics B mission. The funded investigators, their organization, their grant, agreement, or contract number was:
| Area | Investigator | Organization | Number |
|---|---|---|---|
| Aircraft | B. Anderson | NASA Langley | N/A |
| E. Atlas | NCAR | L-8540 | |
| A. Bandy | Drexel U | NCC-1-297 | |
| D. Blake | U of California-Irvine | NCC-1-299 | |
| E. Browell | NASA Langley | N/A | |
| B. Brune | Pennsylvania State U | NCC-1-300 | |
| A. Clarke | U of Hawaii | NCC-1-315 | |
| F. Eisele | Georgia Tech | NCC-1-301 | |
| G. Gregory | NASA Langley | N/A | |
| B. Heikes | U of Rhode Island | NCC-1-302 | |
| M. Mahoney | NASA JPL | N/A | |
| B. Ridley | NCAR | L-68846D | |
| G. Sachse | NASA Langley | N/A | |
| S. Sandholm | Georgia Tech | NCC-1-296 | |
| R. Shetter | NCAR | L-68845D | |
| H. Singh | NASA Ames | N/A | |
| R. Talbot | U of New Hampshire | NCC-1-298 | |
| Modeling | R. Chatfield | NASA Ames | N/A |
| J. Crawford | NASA Langley | N/A | |
| D. Davis | Georgia Tech | NCC-1-306 | |
| H. Fuelberg | Florida State U | NCC-1-308 | |
| D. Jacob | Harvard | NAG-1-2126 | |
| R. Kotamarthi | U of Illinois-Champaign | NCC-1-309 | |
| T. Krishnamurti | Florida State U | NAG-1-2127 | |
| S. Liu | Georgia Tech | NCC-1-317 | |
| R. Newell | Mass Inst of Tech | NAG-1-2173 | |
| S. Oncley | NCAR | L-68847D | |
| J. Rodriguez | AER, Inc. | NAS-1-99063 | |
| A. Thompson | NASA Goddard | N/A |
Aircraft data sets are available for each investigation for each flight. Ground-based data are usually available on a daily basis. Airborne measurements were made at constant altitude (i.e. "survey" flights) over the tropical Pacific and multi-altitude flights (i.e. "intensive" flights) occurred around the intensive sites. Flight missions were conducted during PEM Tropics B from March 6 through April 18, 1999. Raper et al., [1999] lists the flight dates, takeoff and landing times and sites, and also shows flight tracks. The duration, altitude range, ascent and descent rate, and flight path for each mission varied depending on mission objectives and environmental (weather) conditions. Further information about the measurement region and time frame may be found in the Journal of Geophysical Research, Vol. 106, No. D23, 32401-32425, December 16, 2001.
This data set contains all of the in-situ aircraft and ozonesonde data submitted to the GTE data archive by the investigators listed in Section 1.d. Included are the atmospheric chemistry, meteorological and navigational data recorded aboard the NASA Dryden Flight Research Center DC-8 and NASA Wallops Flight Facility P-3B airborne laboratories, backward air mass trajectories, satellite images with the DC-8 and P-3B flight tracks, rain and cloud cover data, and data files containing measurements from each aircraft merged to a common time base.
XX indicates the DC-8 or P-3B flight number.
| gte_pemtb_dc8mXX.zip: | Aircraft Data |
| gte_pemtb_dc8trajmXX.zip: | Backward Air Mass Trajectories Associated With The DC-8 Flights |
| gte_pemtb_sgfvpdXX.zip: | Fast Response H2O Measurements |
| gte_pemtb_merge_dXX.zip: | Merged data files |
| gte_pemtb_dc8_sat_trkm06.zip: | Selected Satellite Images with DC-8 Aircraft Flight Track |
| gte_pemtb_p3mXX.zip: | Aircraft Data |
| gte_pemtb_p3btrajmXX.zip: | Backward Air Mass Trajectories Associated With the P-3B Flights |
| gte_pemtb_merge_pXX.zip: | Merged data files |
| gte_pemtb_sat_trk_p3bmXX.zip: | Selected Satellite Images with P3-B Aircraft Flight Track |
| gte_pemtb_ozonesondes_as.zip: | Ozone Sondes Launched From American Samoa |
| gte_pemtb_ozonesondes_nz.zip: | Ozone Sondes Launched From New Zealand |
| gte_pemtb_ozonesondes_ta.zip: | Ozone Sondes Launched From Tahiti |
| gte_pemtb_ozonesondes_fj.zip: | Ozone Sondes Launched From Fiji |
| gte_pemtb_sst_1999_mmdd_MMDD.zip: | Equatorial Pacific Sea Surface Temperature Analysis for time period from month mm and day dd to month MM day DD |
| gte_pemtb_g10ir_1999_mmdd.zip: | GOES-10 IR Satellite Images for month mm and day dd. |
| gte_pemtb_g10_wv_1999_mmdd.zip: | GOES-10 Water Vapor Satellite Images for month mm and day dd |
| gte_pemtb_lis_march1999.zip: | LIS Lightning for March, 1999 |
| gte_pemtb_lis_april1999.zip: | LIS Lightning for April, 1999 |
| gte_ptb_fsu_trajectory_image_1999mmdd.zip: | Large Scale Trajectory Maps for month mm and day dd |
| gte_ptb_fsu_model_traj_1999mmdd.zip: | Tabulated results for large scale trajectory analysis; month mm and day dd |
| gte_ptb_fsu_model_rain_1999mmdd.zip: | Precipitation Analysis and Forecast for month mm and day dd |
| gte_ptb_fsu_model_uvw_1999mmdd.zip: | Analysis and Forecast of UWV-wind velocities components for month mm and day dd |
| gte_ptb_fsu_cloudcover_image_1999mmdd.zip: | Percentage Cloud Cover Maps for month mm and day dd |
| gte_ptb_fsu_streamlines_image_1999mmdd.zip: | Streamline Maps for month mm and day dd |
The preceding data sets are available from the Langley ASDC (GTE Data and Information page). See the GTE Home page for a additional information relative to the PEM-Tropics B mission as well as other filed missions conducted through the GTE Project Office.
PEM Tropics B investigators have individually reported the results of their investigations in the Journal of Geophysical Research, Vol. 106, No. D23, December 16, 2001.
There are data sets available from the Langley ASDC for 13 other GTE missions conducted from 1983 to 2001. See the GTE home page for a description of the available data.
Global Tropospheric Experiment Pacific Exploratory Tropics B (PEM Tropics B)
| Investigator Area | Investigator Information |
|---|---|
| C1-C4 Alkyl Nitrates and Selected Hydrocarbons | Elliot Atlas NCAR Atmospheric Chemistry Division P. O. Box 3000 1850 Table Mesa Drive Boulder CO 80307 Telephone: 303-497-1425 Fax: 303-497-1400 E-mail: atlas@acd.ucar.edu |
| Airborne Meteorological/Position Data | John D. Barrick MS 483 NASA Langley Research Center Hampton VA 23681-0001 Telephone: 757-864-5831 Fax: 757-864-5841 E-mail: john.d.barrick@nasa.gov |
| Non-methane Hydrocarbons | Don Blake University of California-Irvine Department of Chemistry Irvine, CA 92717 Telephone: 949-824-4195 E-mail:drblake@uci.edu |
| Aerosols, Water Vapor and Ozone Profiles | Edward V. Browell Mail Stop 401A NASA Langley Research Center Hampton VA 23681-0001 Telephone: 757-864-1273 Fax: 757-864-7790 E-mail: edward.v.browell@nasa.gov |
| OH and HO2 | Bill Brune Penn State University Dept. of Meteorology 503 Walker Building University Park PA 16802-5013 Telephone: 814-865-3286 Fax: 814-865-3663 E-mail: brune@essc.psu.edu |
| In-situ Ozone and Aerosol Size Distribution | Gerald L. Gregory (retired) NASA Langley Research Center |
| H2O2, CH3OOH and CH2O | Brian G. Heikes University of Rhode Island GraduateSchool of Oceanography South Ferry Road Narragansett RI 02882-1197 Telephone: 401-874-6683 Fax: 401-874-6898 E-mail: bheikes@gso.uri.edu |
| Temperature Profiles | Mike Mahoney Jet Propulsion Laboratory Microwave and Lidar Technology Section Mail Stop 246-101 Pasadena CA 91109-8099 Telephone: 818.354.5584 Fax: 818-354-4341 E-mail: m.j.mahoney@jpl.nasa.gov |
| Carbon Monoxide, Methane, Nitrous Oxide | Glen W. Sachse MS 472 NASA Langley Research Center Hampton VA 23681-0001 Telephone: 57-864-1566 Fax: 757-864-8818 E-mail: glen.w.sachse@nasa.gov |
| Nitric Oxide, Nitrogen Dioxide | Scott Sandholm Georgia Institute of Technology Earth and Atmospheric Sciences Baker Building, Room 107 923 Dalney Street Atlanta GA 30332-0340 Telephone: 404-894-3895/3824 Fax: 404-894-5073 E-mail: ss27@prism.gatech.edu |
| Nadir and zenith spectroradiometer - Photolysis Frequencies | Richard Shetter NCAR Atmospheric Chemistry Division 1850 Table Mesa Drive Boulder CO 80303 Telephone: 303-497-1420 Fax: 303-497-1400 E-mail: shetter@ncar.ucar.edu |
| PAN, PPN, C2Cl4 | Hanwant Singh NASA Ames Research Center Singh Group Mail Stop 245-5 Moffett Field CA 94035 Telephone: 415-604-6769 Fax: 415-604-3265 E-mail: hanwant.b.singh@nasa.gov |
| Aerosol Composition, Nitric Acid, Organic Acids | Robert W. Talbot University of New Hampshire Institute of Earth, Oceans, Space Morse Hall Complex Systems Research Center Durham NH 03820 Telephone: 603-862-1546 Fax: 603-862-0188 E-mail: rwt@christa.unh.edu |
| Investigator Area | Investigator Information |
|---|---|
| C1-C4 Alkyl Nitrates and Selected Hydrocarbons | Elliot Atlas (See prior listing) |
| DMS, SO2 | Alan R. Bandy Drexel University Department of Chemistry 32nd and Chestnut Street Philadelphia PA 19104 Telephone: 215-895-2640 Fax: 215-895-1980 E-mail: bandyar@drexel.edu |
| Airborne Meteorological/Position Data | John D. Barrick (See prior listing) |
| Non-methane Hydrocarbons and Halocarbons | Don Blake (See prior listing) |
| Aerosols: OPC integral number, area, and volume; UCN/PHA-UCN; DMA integral number, area, and volume |
Antony Clarke University of Hawaii Dept. Of Oceanography 1000 Pope Road Honolulu HI 96822 Telephone: 808-956-6215 Fax: 808-956-7112 E-mail: tclarke@soest.hawaii.edu |
| Investigator for OH, H2SO4, MSA, DMSO | Fred Eisele Georgia Institute of Technology 1850 Table Mesa Drive Boulder Co 80303 Telephone: 303-497-1483 Fax: 303-497-1400 E-mail: fred.eisele@eas.gatech.edu |
| 3-d winds, Temperature and H2O | Geoff Considine (no longer at NASA) NASA Langley Research Center |
| In-situ Ozone | Gerald L. Gregory (retired) (See prior listing) |
| H2O2, CH3OOH and CH2O | Brian G. Heikes (See prior listing) |
| NO, O3, and NO2 | Brian Ridley NCAR P. O. Box 3000 Boulder Co 80307-3000 Telephone: 303-497-1420 Fax: 303-497-1400 E-mail: ridley@acd.ucar.edu |
| Carbon Monoxide and Methane | Glen W. Sachse (See prior listing) |
| Carbon Dioxide | Stephanie A.Vay Mail Stop 483 NASA Langley Research Center Hampton VA 23681 Telephone: 757-864-1574 Fax: 757-864-5841 E-mail: stephanie.a.vay@nasa.gov |
| Nadir and zenith spectroradiometer - Photolysis Frequencies | Richard Shetter (See prior listing) |
| Selected Aerosol Associated Soluble Ions and Nitric Acid | Robert W. Talbot (See prior listing) |
(see the GTE data archive for available model products)
| Investigator Area | Investigator Information |
|---|---|
| Diagnostic Modeling of PEM-Tropics B field data; Investigation of the HOx/NOx/O3 photo-chemical system. | James Crawford NASA Langley Research Center Mail Stop 483 Hampton VA 23681 Telephone: 757-864-7231 Fax: 757-864-5841 E-mail: james.h.crawford@nasa.gov |
| Tracer Transport in the Tropics: Integrating the PEM-Tropics and MOPITT Perspectives and Quantifying Controls on Global OH | Robert Chatfield NASA Ames Research Center MS 245-5 Moffett Field CA 94035 Telephone: 650-604-5490 E-mail: robert.b.chatfield@nasa.gov |
| Tropospheric Diagnostic Modeling of PEM-Tropics B field data; Investigation of the HOx/NOx/O3 photo-chemical system and its coupling to sulfur chemistry and P-3B Mission Scientist | Douglas Davis Georgia Institute of Technology School of Earth and Atmospheric Sciences Room 108 221 Bobby Dodd Way Atlanta GA 30332-0340 Telephone: 404-894-9565 Fax: 404-894-1993 E-mail: dd16@prism.gatech.edu |
| Numerical simulations and diagnostic studies of meteorological conditions during PEM-Tropics B, and DC-8 Mission Meteorologist | Henry Fuelberg Florida State University Dept. of Meteorology Tallahassee FL 32306-4520 Telephone: 850-644-6466 Fax: 850-644-9642 E-mail: hfuelberg@fsu.edu |
| Evaluation of PEM-Tropics Observations; Uncertainty analysis and effects of deep convection on tropospheric chemistry | Roa Kotamarthi Argonne National Laboratory University of Illinois, Urbana-Champaign 9700 South Cass Avenue Argonne IL 60439-4843 Telephone:630-252-7164 Fax: 630-252-5498 E-mail: vrkotamarthi@anl.gov |
| Dynamic factors controlling O3, OH and aerosol levels over the PEM-Tropics B region | T. Krishnamurti Florida State University Department of Meteorology Tallahassee FL 32306-4520 Telephone: 850-644-2210 Fax: 850-644-9642 E-mail: krish@met.fsu.edu |
| Analysis and modeling of PEM-Tropics B data and DC-8 Mission Scientist | Daniel Jacob Harvard University Department of Engineering and Applied Sciences Pierce Hall, Room 109A 29 Oxford Street Cambridge MA 02138 Telephone: 617-495-1794 Fax: 617-495-4551 E-mail: djj@io.harvard.edu |
| Modeling and analysis of PEM-Tropics B Observations | Shaw Liu (no longer at GA Tech) Institute of Earth Sciences Academia Sinica PO Box 1-55, Nankang Taipei, Taiwan 11529 ROC Telephone: 886-2-2783-9910 ext.407 Fax: 886-2-2783-9871 E-mail: shaw.liu@eas.gatech.edu |
| Physical process governing atmospheric trace constituents measured from aircraft in PEM-Tropics B and P-3B Mission Meteorologist | Reginald Newell (deceased 12/27/02) Massachusetts Institute of Technology |
| Point-by-Point Photochemical Model; Steady State Diurnal Model & Trajectory Photochemical Process Model | Jose Rodriguez A.E.R. Inc. 840 Memorial Drive Cambridge MA 02139 Telephone: 617-547-6207 Fax: 617-876-7158 E-mail: jose@aer.com |
| Fluxes and budgets of trace gases over the tropical Pacific | Steve Oncley NCAR 3450 Mitchell Lane Boulder CO 80301 Telephone: 303-497-8757 Fax: 303-497-8770 E-mail: oncley@ucar.edu |
| Dynamical and chemical influences on PEM-Tropics B Ozone profiles | Anne Thompson NASA Goddard Space Flight Center Code 916 Bldg. 33, Room E417 Greenbelt MD 20771 Telephone: 301-286-2629 Fax: 301-614-5903 E-mail: thompson@gator1.gsfc.nasa.gov |
The following persons have more specialized knowledge about the data in the data sets or in their field or general knowledge about the mission, its execution and the data sets.
| Investigator or Knowledge Area | Investigator and Contact Information | |
|---|---|---|
| Measurements for DMS and SO2 | Donald C. Thornton Drexel University Department of Chemistry 32nd and Chestnut Street Philadelphia PA 19104 |
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| PEM Tropics B Mission Co-Scientists | Douglas D. Davis (See prior listing) |
Daniel Jacob (See prior listing) |
| PEM Tropics B Program Manager | Robert J. McNeal (retired) NASA Headquarters |
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| PEM Tropics B Project Manager | James M. Hoell, Jr. (retired) NASA Langley Research Center |
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| PEM Tropics B Mission Meteorologists | Reginald Newell (deceased 12/27/02) Massachusetts Institute of Technology |
Henry Fuelberg Florida State University (See prior listing) |
| PEM Tropics B Expedition Manager | Richard J. Bendura (retired) NASA Langley Research Center |
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| DC-8 Aircraft Manager | Chris Miller NASA Dryden Flight Research Center MS D1623H Bldg. 1623, Room 204 Edwards CA 93523-0273 Telephone: 661-258-2482 Fax: 661-277-7746 E-mail: chris.j.miller@nasa.gov |
Airborne Science Program Office MS D1623H Edwards, CA 93523-0273 Phone: (650) 604-4388 |
| P-3B Aircraft Manager | Douglas Young NASA Wallops Flight Center Mailcode 548.W Wallops Island VA 23337-5099 Telephone: 757-824-1443 E-mail: douglas.c.young@nasa.gov |
Wallops Flight Facility Aircraft Office NASA Wallops Flight Facility Wallops Island VA 23337-5099 Telephone: 757-824-1529 |
| Logistics | Mike Cadena SAIC Mail Stop 927 Hampton VA 23681 Telephone: 757-827-4860 E-mail: michael.j.cadena@nasa.gov |
Erika Harper SAIC |
| Experiment Integration | DC-8: James L. Raper, Sr. (retired) NASA Langley Research Center |
P-3B: James M. Hoell, Jr. (retired) NASA Langley Research Center |
| PEM Tropics B Data Manager | James L. Raper, Sr. (See prior listing) |
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The equations used to calculate project provided variables Mach Number (M), Static Air Temperature (Ts), True Air Speed (TAS), Potential Temperature (θ), Vapor Pressure (e), Specific Humidity (q), Mixing Ratio (r), and Relative Humidity (%) are given below. Potential usage and applications of the described data sets can be seen in the articles that comprise the Journal of Geophysical Research PEM Tropics B Special Section (Vol. 106, No. D23, December 16, 2001) and the Spring 2002 AGU PEM Tropics B Special Session(s).
For convenience of the users, the calculated variables below are provided.
Mach Number, M: |
|
 |
M = Mach Number Ps = Static Pressure Qc = Differential Pressure |
Static Air Temperature, Ts: | |
 |
TS = Static Air Temperature (°K) TT = Total Air Temperature (°K) γ = 1.4, ratio of specific heat of air at constant pressure and volume |
True Air Speed, TAS: | |
 |
TAS = True Air Speed (knots) TS = Static Air Temperature (°K) M = Mach Number a = Speed of Sound |
Potential Temperature, θ: | |
 |
θ = Potential Temperature (°K) TS = Static Air Temperature (°K) Ps = Static Pressure (mb) |
Vapor Pressure, e :
ewater (mb) = [1.0007 + (3.46 * 10-6 * PS)] * 6.1121* EXP[17.502 * T/(240.97 + T)]
eice (mb) = [1.0003 + (4.18 * 10-6 * PS)] * 6.1115* EXP[22.452 * T/(272.55 + T)]
e = Partial Pressure of Water Vapor (mb)
PS = Static Pressure (mb)
T = Static Air Temperature (°C) for Saturation Vapor Pressure
or
T = Dew/Frost Point (°C) for Partial Pressure of Water Vapor
ProjDP of zero or greater should be used to derive the partial pressure of water vapor w.r.t water (ewater) and the ProjDP less than zero should be used to derive the partial pressure of water vapor w.r.t ice (eice).
StatTempDegC and ProjDP parameters recorded in the P-3B data set are substituted to calculate saturation vapor pressure and partial pressure of water vapor, respectively.
TSDEGC and ProjDP parameters recorded in the DC-8 data set are substituted to calculate saturation vapor pressure and partial pressure of water vapor, respectively. Also notice in the DC-8 data set there is a redundant static air temperature measurement, TSCALC, which is calculated by DADS. Although TSDEGC and TSCALC track closely they can diverge by ≈ 1° at the low and high ends of the measurement range.
Specific Humidity, q: | |
 |
 |
Mixing Ratio, r: | |
 |
 |
| Note: ppmv = 1.608 * ppmw ppmw = 0.622 * ppmv | |
Relative Humidity, %: | |
w.r.t. water, |
w.r.t. ice, |
Interested readers should see the Journal of Geophysical Research, Vol. 106, No. D23, December 16, 2001, and documents therein, for plots and the results of analysis of data.
See the GTE Data Format Document.
A general description of data granularity as it applies to the IMS appears in the EOSDIS Glossary. Aircraft data sets are available for each investigation for each flight.
Aircraft data , merged data sets, flight tracks, meteorological products, lightning data, trajectories, satellite images and ozonesonde data for the PEM Tropics B mission are contained in the archive. No additional data products relevant to PEM Tropics B are anticipated. Model data products can be found at the GTE data archive.
This data is available online or on a CDROM via the LaRC ASDC on the GTE Data and Information page. Additional information on PEM-Tropics B and other GTE field missions can be found on the GTE home page.
The Atmospheric Science Data Center at NASA's Langley Research Center.
Publication of a portion(s) of the data archive should acknowledge the principal investigator(s) responsible for the data by referencing the appropriate manuscript in the Journal of Geophysical Research, Vol. 106, No. D23, December 16, 2001.
Airborne measurements were made over the central Pacific. A more detailed description of the surface level environmental characteristics for the experiment region is provided in the individual papers for each investigation included in the Journal of Geophysical Research, Vol. 106, No. D23, December 16, 2001.Additional information may be found in other publications authored by the principal investigators or on the GTE homepage.
Raper et al. [2001] shows the flight missions that were conducted during PEM Tropics B. Also shown are the takeoff and landing sites. The duration, altitude range, assent and descent rate, and flight path of each mission varied depending on mission objective and environmental (weather) conditions. The nominal air speed ranged from 431knots (approximately 497 mph) at 12 km altitude (for the DC-8) to 270 knots (approximately 310 mph) at 8 km (for the P-3B).
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Intensive measurement regions and aircraft flight paths, along which measurements were also made, are shown in Raper et al., [2001].
The nominal measurement characteristics for the DC-8 and P-3B instrumentation is given in Table 1a and Table 1b, respectively (Raper et al., 2001).
PEM Tropics B aircraft missions were conducted from 3/6/99-4/18/99. The dates and times for each DC-8 and P-3B flight are shown in Table 3a and Table 3b, respectively (Raper et al., 2001).
Not all of the parameters are in each data set granule. Also, the ranges vary between data sets and between granules within each data set. Species measured are given Raper et al., [2001].
See Table 1a and Table 1b (Raper et al., 2001).
The units of measure vary widely depending on species and measurement environment and are addressed in the individual papers for each investigation included in the Journal of Geophysical Research, Vol. 106, No. D23, December 16, 2001.
See Raper et al., [2001].
See Raper et al., [2001].
The GTE Data Format Document contains examples of each data set type.
The sources of error vary widely depending on species and measurement environment and are addressed in the individual papers for each investigation included in the PEM Tropics B special issue/section of the Journal of Geophysical Research, Vol. 106, No. D23, December 16, 2001 and/or the papers referenced in that publication. For further details, contact the responsible principal investigators (see Section 1.d) and review the header for each data record.
None reported for the current archive version. See the readme files and/or header records included with each data set for information provided by the responsible investigator.
The data sets submitted to the ASDC are considered final and no further updates are anticipated.
Details of data acquisition and materials are addressed in the Spring 2000 AGU PEM Tropics-B Special Session (s) and the papers contained in the Journal of Geophysical Research PEM Tropics-B Special Issue (Vol. 106, No. D23, December 16, 2001).
Spring 2000 AGU PEM Tropics B Special Session(s)
PEM Tropics B Special Section, Journal of Geophysical Research-Atmosphere, Vol. 106, No. D23, December 16, 2001 and Vol. 108 No. D2, January 27, 2003.
GTE Bibliography: Citations for publications, presentations, and media coverage
Raper, J.L., M.M. Kleb, D.J. Jacob, D.D. Davis, R.E. Newell, H.E. Fuelberg, R.J. Bendura, J.M. Hoell, and R.J. McNeal, Pacific Exploratory Mission in the Tropical Pacific: PEM-Tropics B, March-April 1999, J. Geophys. Res., 106, 32401-32425, 2001.
