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Tropospheric Aerosol Radiative Forcing Observational eXperiment (TARFOX) Langley DAAC Data Set Document |
Aerosol effects on atmospheric radiation are a leading source of uncertainty in predicting future climate. TARFOX was designed to reduce this uncertainty by measuring and analyzing aerosol properties and effects in the U.S. eastern seaboard, where one of the world's major plumes of industrial haze moves from the continent over the Atlantic Ocean.
The TARFOX Intensive Field Campaign was conducted July 10-31, 1996. It included coordinated measurements from four satellites (GOES-8, NOAA-14, ERS-2, LANDSAT), four aircraft (ER-2, C-130, C-131A, and a modified Cessna), land sites, and ships. A variety of aerosol conditions was sampled, ranging from relatively clean behind frontal passages to moderately polluted with aerosol optical depths exceeding 0.5 at mid-visible wavelengths. Gradients of aerosol optical thickness were sampled to aid in isolating aerosol effects from other radiative effects and to more tightly constrain closure tests, including those of satellite retrievals. Early results from TARFOX include demonstration of the unexpected importance of carbonaceous compounds and water condensed on aerosol in the US mid-Atlantic haze plume, chemical apportionment of the aerosol optical depth, measurements of the downward component of aerosol radiative forcing, and agreement between forcing measurements and calculations. A wide variety of closure studies is currently in progress.
This document provides information for the following data sets:
| TARFOX_UWC131A_SUNP: | Tropospheric Aerosol Radiative Forcing Observational eXperiment - Ames Sun Photometer flown on University of Washington C-131A aircraft |
| TARFOX_UWC131A: | Tropospheric Aerosol Radiative Forcing Observational eXperiment - University of Washington instrumented C-131A aircraft |
| TARFOX_WALLOPS_MET: | Tropospheric Aerosol Radiative Forcing Observational eXperiment - meteorological data from Wallops ground station |
| TARFOX_WALLOPS_SMPS: | Tropospheric Aerosol Radiative Forcing Observational eXperiment - Scanning Mobility Particle Sizer data taken at Wallops ground station |
| TARFOX_WALLOPS_SONDE: | Tropospheric Aerosol Radiative Forcing Observational eXperiment - Radiosonde data from balloons launched at Wallops ground station |
Aerosol particles can change the Earth's radiation budget both directly by scattering and absorption and indirectly by affecting cloud properties. Changing the net flux of radiation above or within the atmosphere changes the energy available for driving climatic processes. Hence, such a net flux change is termed a radiative forcing of climate. Negative forcings tend to cool the climate, and positive forcings tend to warm it. Current estimates of the global, annually-averaged, direct radiative forcing by anthropogenic aerosols (e.g., sulfates, soots, mineral dust, biomass smokes) range from about -0.3 to -1.0 W m-2, with an uncertainty factor of about two. Analogous, but even less certain, estimates for the indirect effect are 0 to -1.5 W m-2. These values are comparable in magnitude, but opposite in sign, to the current estimates of +2.1 to +2.8 W m-2 for the forcing caused by increases in greenhouse gases over the past century.
Because of the great spatial variability in aerosol concentrations that results from their short lifetime, there are many regions - principally over and downwind of major source areas - where the best estimates of aerosol negative forcing exceed the greenhouse positive forcing. Some studies show that aerosol effects appear to be present in global and regional twentieth-century temperature records, and that inclusion of aerosol effects in numerical models improves agreement with observed temperature patterns in both time (decadal and diurnal) and space. Although these studies suggest that anthropogenic aerosols can play an important role in determining current and future climates, their results are far from conclusive. Major questions remain about the realism with which models represent the great diversity of actual aerosol properties, processes, and radiative effects. Error analyses show that the uncertainty in the aerosol radiative forcing is unacceptably large - larger, in fact, than the uncertainty in climate forcing by all greenhouse gases released over the past century.
As a result of both the potential importance of aerosols and the large uncertainties in their radiative effects, the International Global Atmospheric Chemistry (IGAC) Project has established a Focus on Atmospheric Aerosols (FAA) and endorsed a series of aerosol field campaigns. TARFOX is the second in the IGAC/FAA series. TARFOX was designed to reduce uncertainties by measuring and analyzing a wide range of aerosol properties and effects in the US eastern seaboard. This is the region where one of the world's major plumes of industrial haze moves from the continent over the Atlantic Ocean.
The overall goal of TARFOX is to reduce uncertainties in the effects of aerosols on climate by determining the direct radiative impacts, as well as the chemical, physical, and optical properties, of the aerosols carried over the western Atlantic Ocean from the United States. Subsidiary objectives of TARFOX are to:
An important component of the closure studies is tests and improvements of algorithms that retrieve aerosol properties and effects from satellite and aircraft radiometers. The resulting validated algorithms will permit extensions of the TARFOX results to other times and locations that have aerosol properties similar to those of the TARFOX Intensive Field Campaign (IFC).
PARTICULATE OPTICAL DEPTH
RAYLEIGH OPTICAL DEPTH
TOTAL OPTICAL DEPTH
AEROSOL BACKSCATTERING COEFF
AEROSOL SCATTERING COEFF
CONDENSATION NUCLEI
DROPLET CONCENTRATION
EFFECTIVE DROPLET RADIUS
LIQUID WATER CONTENT
OZONE MIXING RATIO
PARTICLE NUMBER CONCENTRATION
PRESSURE
RELATIVE HUMIDITY
TEMPERATURE
WIND DIRECTION
WIND SPEED
PARTICLE NUMBER CONCENTRATION
ALTITUDE
PRESSURE
RELATIVE HUMIDITY
TEMPERATURE
More detailed information on TARFOX can be obtained from the TARFOX Web Site.
Tropospheric Aerosol Radiative Forcing Observational eXperiment (TARFOX)
TARFOX_UWC131A_SUNP:
Russell, Philip B.
NASA Ames Research Center
Mail Stop 245-5
Moffett Field, CA 94035-1000
USA
Telephone: 415/604-5404
FAX: 415/604-3625
E-mail: prussell@mail.arc.nasa.gov
TARFOX_UWC131A:
Hobbs, Peter V.
Atmospheric Sciences AK 40, Room 502
University of Washington
Seattle, WA 98195
USA
Telephone: 206/543-6027
FAX: 206/543-0308
E-mail:phobbs@atmos.washington.edu
TARFOX_WALLOPS_MET:
FERRARE, RICHARD
Mail Stop 401A
21 Langley Boulevard
NASA Langley Research Center
Hampton, VA 23681-2199
USA
Telephone: 757 864-2698
FAX: 757 864-7790
E-mail: R.FERRARE@LaRC.NASA.GOV
TARFOX_WALLOPS_SMPS:
Ji, Qiang
NASA Goddard Space Flight Center
Mailstop 913.0
Greenbelt, MD 20
USA
Telephone: 301 286-3973
FAX:
E-mail: ji@climate.gsfc.nasa.gov
TARFOX_WALLOPS_SONDE:
FERRARE, RICHARD
Mail Stop 401A
21 Langley Boulevard
NASA Langley Research Center
Hampton, VA 23681-2199
USA
Telephone: 757 864-2698
FAX: 757 864-7790
E-mail: R.FERRARE@LaRC.NASA.GOV
Coordinated measurements were made from four satellites (GOES-8, NOAA-14, ERS-2, LANDSAT), four aircraft (ER-2, C-130, C-131A, and a modified Cessna), land sites, and ships. A variety of aerosol conditions was sampled, ranging from relatively clean behind frontal passages to moderately polluted with aerosol optical depths exceeding 0.5 at mid-visible wavelengths. Gradients of aerosol optical thickness were sampled to aid in isolating aerosol effects from other radiative effects and to more tightly constrain closure tests, including those of satellite retrievals.
| TARFOX_UWC131A_SUNP | UW C131 |
| TARFOX_UWC131A | UW C131 |
| TARFOX_WALLOPS_MET | Ground Station |
| TARFOX_WALLOPS_SMPS | Ground Station |
| TARFOX_WALLOPS_SONDE | Ground Station |
See the TARFOX Science and Implementation Plan, June 1996.
PARTICULATE OPTICAL DEPTH
RAYLEIGH OPTICAL DEPTH
TOTAL OPTICAL DEPTH
AEROSOL BACKSCATTERING COEFF
AEROSOL SCATTERING COEFF
CONDENSATION NUCLEI
DROPLET CONCENTRATION
EFFECTIVE DROPLET RADIUS
LIQUID WATER CONTENT
OZONE MIXING RATIO
PARTICLE NUMBER CONCENTRATION
PRESSURE
RELATIVE HUMIDITY
TEMPERATURE
WIND DIRECTION
WIND SPEED
PARTICLE NUMBER CONCENTRATION
ALTITUDE
PRESSURE
RELATIVE HUMIDITY
TEMPERATURE
See the TARFOX Operations Summary Document, November 1996.
| Data Set Name |
Min Lat |
Max Lat |
Min Lon |
Max Lon |
|---|---|---|---|---|
| TARFOX_UWC131A_SUNP | 36.01 | 39.78 | -76.53 | -72.56 |
| TARFOX_UWC131A | 36.02 | 39.79 | -76.54 | -72.58 |
| TARFOX_WALLOPS_MET | 37.85 | 37.85 | -75.48 | -75.48 |
| TARFOX_WALLOPS_SMPS | 37.85 | 37.85 | -75.48 | -75.48 |
| TARFOX_WALLOPS_SONDE | 37.85 | 37.85 | -75.48 | -75.48 |
U.S. eastern seaboard
TARFOX_UWC131A_SUNP: ...
TARFOX_UWC131A: ...
TARFOX_WALLOPS_MET: Point Measurements
TARFOX_WALLOPS_SMPS: Point Measurements
TARFOX_WALLOPS_SONDE: ...
07/10/1996 - 07/31/1996
TARFOX_UWC131A_SUNP: 3 second
TARFOX_UWC131A: 1 second
TARFOX_WALLOPS_MET: ...
TARFOX_WALLOPS_SMPS: 5 minutes
TARFOX_WALLOPS_SONDE: 2 seconds
PARTICULATE OPTICAL DEPTH
RAYLEIGH OPTICAL DEPTH
TOTAL OPTICAL DEPTH
AEROSOL BACKSCATTERING COEFF
AEROSOL SCATTERING COEFF
CONDENSATION NUCLEI
DROPLET CONCENTRATION
EFFECTIVE DROPLET RADIUS
LIQUID WATER CONTENT
OZONE MIXING RATIO
PARTICLE NUMBER CONCENTRATION
PRESSURE
RELATIVE HUMIDITY
TEMPERATURE
WIND DIRECTION
WIND SPEED
PARTICLE NUMBER CONCENTRATION
ALTITUDE
PRESSURE
RELATIVE HUMIDITY
TEMPERATURE
A general description of data granularity as it applies to the IMS appears in the EOSDIS Glossary.
There are no plans for reprocessing.
The Langley DAAC performs an inspection process on this data received by the data producer via ftp. The DAAC checks to see if the transfer of the data completed and were delivered in their entirety. An inspection software was developed by the DAAC to see if the code was able to read every granule. The code also checks to see if every parameter of data falls within the ranges which are included in the granule. This same code extracts the metadata required for ingesting the data into the IMS. If any discrepancies are found, the data producer is contacted. The discrepancies are corrected before the data are archived at the DAAC.
To reduce uncertainties in the effects of aerosols on climate by determining the direct radiative impacts, as well as the chemical, physical, and optical properties, of the aerosols carried over the western Atlantic Ocean from the United States.
Unavailable at this time.
The software can be obtained through the Langley DAAC. Please refer to the contact information below. The software can also be obtained at the same time the user is ordering this data set.
The Langley DAAC provides multiple interfaces to access its data holdings. The graphical and character user interfaces allow users to search and order data; and web interfaces allow direct access to some data holdings for immediate downloading or placing media orders, for searching the data holdings, and downloading electronically available holdings, and for ordering prepackaged CD-ROMs and videocassettes. All of these methods are easily obtained from the Langley DAAC web site.
The Langley DAAC will continue to archive this data.
Charlson, R. J., and J. Heintzenberg, eds., Aerosol Forcing of Climate, Wiley, New York, 416 pp., 1995.
Charlson, R. J., S. E. Schwartz, J. M. Hales, R. D. Cess, J. A. Coakley, Jr., J. E. Hansen, and D. J. Hofmann, Climate forcing by anthropogenic aerosols, Science, 255, 423-430, 1992.
Durkee, P. A., B. B. Brown, K. E. Nielsen, P. B. Russell, and J. Livingston, Aerosol optical properties from NOAA AVHRR and GOES-9 measurements during TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S87, 1997.
Engardt, M., and H. Rodhe, A comparison between patterns of temperature trends and sulfate aerosol pollution. Geophys. Res. Lett., 20, 117-120, 1993.
Ferrare, R. A., G. Schwemmer, S. H. Melfi, D. N. Whiteman, D. Guerra, and D. Wooten, Scanning Raman lidar measurements of aerosol backscatter and extinction profiles during TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S81, 1997.
Hansen, J., M. Sato, and R. Ruedy, Long-term changes of the diurnal temperature cycle: implications about mechanisms of global climate change, Atmos. Res., 37, 175-209, 1995.
Hegg, D. A., J. Livingston, P. V. Hobbs, T. Novakov, and P. B. Russell, Chemical apportionment of aerosol column optical depth off the Mid-Atlantic coast of the United States, J. Geophys. Res., in press, 1997b.
Hegg, D. A., J. Livingston, P. V. Hobbs, T. Novakov, and P. B. Russell, Chemical apportionment of aerosol column optical depth off the Mid-Atlantic coast of the United States, EOS, Trans. Amer. Geophys. Union, 78, S82, 1997a.
Hignett, P., and J. P. Taylor, Aircraft observations of direct aerosol forcing during TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S88, 1997.
Hobbs, P. V., Summary of types of data collected on the University of Washington's Convair C-131A aircraft in the Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX) on the East Coast of the United States from July 10-31, 1996. Report from the Cloud and Aerosol Research Group, University of Washington, Seattle, WA, October 1996.
Hobbs, P. V., An overview of the University of Washington's airborne measurements in TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S82, 1997.
Hobbs, P. V., and B. J. Huebert (eds.), Atmospheric Aerosols: A New IGAC Focus, IGAC Core Project Office, Cambridge, MA, USA, 40 pp., October 1996.
Hobbs, P. V., P. B. Russell, and L. Stowe, Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX), in: Hobbs, P. V. and B. J. Huebert (eds.), Atmospheric Aerosols: A New IGAC Focus, IGAC Core Project Office, Cambridge, MA, USA, 40 pp., October 1996.
Hunter, D. E., S. E. Schwartz, R. Wagener, and C. Benkovitz, Seasonal, latitudinal, and secular variations in temperature trend: evidence for influence of anthropogenic sulfate, Geophys. Res. Lett., 20, 2455-2458, 1993.
Husar, R. B., J. M. Prospero and L. L. Stowe, Characterization of tropospheric aerosols over the oceans with the NOAA advanced very high resolution radiometer optical thickness operational product, J. Geophys. Res., in press, July 1997.
Ignatov, A., L. Stowe, and R. Singh, Validation of the NOAA/NESDIS operational aerosol retrievals using TARFOX data, EOS, Trans. Amer. Geophys. Union, 78, S87, 1997.
Intergovernmental Panel on Climate Change (IPCC), Radiative forcing of climate change, in Climate Change 1994, edited by J. T. Houghton, L. G. Meira Filho, J. Bruce, H. Lee, B. A. Callendar, E. Haites, N. Harris, and K. Maskell, pp. 1-231, Cambridge Univ. Press, New York, 1995.
IPCC, Climate Change 1995: The Science of Climate Change, edited by J. T. Houghton, L. G. Meira Filho, B. A. Callendar, N. Harris, A. Kattenberg, and K. Maskell, 572 pp., Cambridge Univ. Press, New York, 1996.
Ismail, S., E. V. Browell, A. S. Moore, W. C. Edwards, K. Brown, S. A. Kooi; V. G. Brackett; and M. B. Clayton, LASE measurements of aerosol, cloud, and water vapor profiles during TARFOX field experiment, EOS, Trans. Amer. Geophys. Union, 78, S82, 1997.
Karl, T. R., R. W. Knight, G. Kukla, and J. Gavin, Evidence for radiative effects of anthropogenic sulfate aerosols in the observed climate record, in Aerosol Forcing of Climate, R. J. Charlson and J. Heintzenberg, Eds., pp. 363-382 (John Wiley & Sons, Ltd., Chichester, New York, 1995).
Kiehl, J. T., and B. P. Briegleb, The relative roles of sulfate aerosols and greenhouse gases in climate forcing, Science, 260, 311-314, 1993.
Kotchenruther, R.A., P. V. Hobbs, and D. A. Hegg, Humidification factors for aerosols off the mid-Atlantic coast of the United States, EOS, Trans. Amer. Geophys. Union, 78, S82, 1997.
Li Xiaowen, Zhou Xiuji, Li Weiliang, and Chen Longxun, The cooling of Sichuan province in recent 40 years and its probable mechanisms, Acta Meteorologica Sinica, 9, 57-68, 1995.
Livingston, J. M., and P. B. Russell, Aerosol optical depth spectra, vertical profiles, and horizontal transects derived from TARFOX airborne sunphotometer measurements, EOS, Trans. Amer. Geophys. Union, 78, S92, 1997.
Meel, G. A., W. M. Washington, D. J. Erickson III, B. P. Briegleb, and P. J. Jaumann, Climate change from increased CO2 and direct and indirect effects of sulfate aerosols, Geophys. Res. Lett., 23, 3755-3758, 1996. Novakov, T., D. A. Hegg and P. V. Hobbs, Airborne measurements of carbonaceous aerosols during TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S82, 1997a.
Novakov, T., D. A. Hegg and P. V. Hobbs, Airborne measurements of carbonaceous aerosols during TARFOX, J. Geophys. Res., in press, 1997b.
Remer, L. A., R. K. Kleidman, Y. J. Kaufman, B. N. Holben, and A. Smirnov, Aerosol physical and optical properties from AERONET data at TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S81, 1997.
Russell, P. B., Next step: Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX), IGACtivities Newsletter, No. 4, pp. 10-13, March 1996.
Russell, P. B., Summary of the TARFOX Data Workshop Held January 29-31, 1997, Two Volumes, NASA Ames Research Center, Moffett Field, CA, USA, February 1997.
Russell, P. B., P. Hignett, L. L. Stowe, and P. V. Hobbs, IGAC's Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX) Field Program Completed, IGACtivities Newsletter, No. 7, pp. 8-9, December 1996a.
Russell, P. B., W. Whiting, P. V. Hobbs, and L. L. Stowe, Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX) Science and Implementation Plan, NASA Ames Research Center, Moffett Field, CA. Also on the WWW site http://tarfox.arc.nasa.gov/, 1996b.
Russell, P. B., P. V. Hobbs, and L. L. Stowe, The Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX): An overview of science goals and methods, EOS, Trans. Amer. Geophys. Union, 78, S81, 1997a.
Russell, P., J. Livingston, D. Hegg, P. Hobbs, T. Novakov, and J. Wong, Direct aerosol radiative forcing off the US Mid-Atlantic coast: Calculations from sunphotometer and in situ measurements in TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S87, 1997b.
Santer, B. D., et al., Towards the detection and attribution of an anthropogenic effect on climate, Clim. Dynam., 12, 77-100, 1995.
Schwartz, S. E., The whitehouse effect - shortwave radiative forcing of climate by anthropogenic aerosols: an overview, J. Aerosol Sci., 27, 359-382, 1996.
Smirnov, A., B. N. Holben, L. A. Remer, and I. Slutsker, Measurement of atmospheric optical parameters on East Coast sites, ships and Bermuda, EOS, Trans. Amer. Geophys. Union, 78, S81, 1997.
Stowe, L. L., The Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX), EOS, Trans. Amer. Geophys. Union, 75, S73, 1994a.
Stowe, L., Science Project 8: Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX), in A Plan For An International Global Aerosol Program (IGAP), report, edited by P. V. Hobbs, pp. 35-41, Dep. of Atmos. Sci., Univ. of Wash., Seattle, 1994b.
Stowe, L. L., H. Jacobowitz, C Kondragunta, and G. Luo, Aerosol direct radiative forcing estimated from NOAA/14 AVHRR data during TARFOX, EOS, Trans. Amer. Geophys. Union, 78, S88, 1997.
TanrÅ, D., L. R. Remer, and Y. J. Kaufman, Retrieval of aerosol properties from the MODIS Airborne Simulator on the ER-2 during the TARFOX experiment, EOS, Trans. Amer. Geophys. Union, 78, S87, 1997.
Taylor, J. P., and P. Hignett, The effects of humidity on aerosol radiative properties, EOS, Trans. Amer. Geophys. Union, 78, S82, 1997.
Tett, S. F. B., J. F. B. Mitchell, D. E. Parker, and M. R. Allen, Human influence on the atmospheric vertical temperature structure: Detection and observations, Science, 274, 1170-1173, 1996.
Whiting, W., P. B. Russell, P. V. Hobbs, and L. L. Stowe, TARFOX Operations Summary, NASA Ames Research Center, Moffett Field, CA, USA, 140 pp., November 1996.
