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Summary:
The Jaeger Monthly Mean Global Precipitation data set consists of
gridded mean monthly global precipitation values for 1931 to 1960 over
the continents and 1955 to 1965 over the oceans. The extent of the data
ranges from latitudes of 90 degrees South to 90 degrees North and longitudes
of 180 degrees East to 180 degrees West.
Table of Contents:
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1. Data Set Overview:
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Jaeger Monthly Mean Global Precipitation
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The Jaeger surface rain gauge observations dataset consists of gridded mean
monthly global precipitation values for 1931 to 1960 over the continents and
1955 to 1965 over the oceans.
The precipitation data over the continental grids are based on the
eye estimates from isopleth maps prepared from up-to-date climatic atlases
conataining annual and monthly rainfall values, supplemeted by other
datasets. For estimates rainfall over ocean grids, Moller's method was
adopted. Monthly percentage frequencies were extracted from the mapped
isolines of the US Marine Climatic Atlas (US Naval Weather Service 1955-1965)
and interpolated to grid points, After re-expressing the monthly frequencies
as annual percentages, the values were scaled to rainfall depth units using
Geiger's(1965) precipitation map to yield monthly precipitation means.
- This data set is extensively used
for producing global analyses of large-scale monthly rainfall
climatology data using satellite and conventional data.
- The parameter for this data set is monthly average rainfall.
- For a discussion, please refer to Jaeger (1983).
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The following related data sets are available from the Goddard
Space Flight Center (GSFC)) Distributed Active Archive Center (DAAC):
Legates Surface & Ship Observations Precipitation
GPCC Rain Gauge Analysis for the GPCP
Chang SSM/I Derived Ocean Monthly Rain Indices
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2. Investigator(s):
- Lutz Jaeger
- The Jaeger Monthly Mean Global Precipitation Data Set
- Please direct all queries to Goddard Space Flight Center (GSFC) DAAC Help
Desk.
- DAAC Help Desk:
The DAAC help desk also provides additional information on the Goddard DAAC
system capabilities, and other supported datasets. The Help Desk can be reached
at: - EOS Distributed Active Archive Center (DAAC)
- Code 610.2
- NASA Goddard Space Flight Center
- Greenbelt, Maryland 20771
- Internet:daacuso@daac.gsfc.nasa.gov
- 301-614-5224 (voice)
- 301-614-5268 (fax)
- 3. Theory of Measurements:
- This information is not available at this time.
- 4. Equipment:
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
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5. Data Acquisition Methods:
- The Goddard DAAC obtains the monthly rainfall data set
via an ftp transfer to the data producer's ftp site.
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6. Observations:
- No data notes are available at this time.
- No field notes are available at this time.
- 7. Data Description:
The data set contains monthly globally merged
rainfall grid estimates extending from latitudes of 90
degrees North to 90 degrees South and longitudes of 180 degrees West to
180 degrees East. The data progresses in order from North to South,
and West to East.The first grid element correspond to values centered
at 89.375 degrees North, 178.75 degrees West.
The rainfall estimates cover the region from latitudes of 90
degrees North to 90 degrees South and longitudes of 180 degrees West to
180 degrees East. as shown below.
- The spatial resolution of the data is 2.5 degree latitude by 5.0
degree longitude grids.
- Cylindrical Equidistant.
The Jaeger Monthly Mean Global Precipitation Data are
mapped to a 2.5 degree latitude by 5 degree longitude equal area grid over the region from 90 degrees
South to 90 degrees North and 180 degrees East to 180 degrees West.
- The data are monthly estimates for the period from January 31,
1931 to Dec 31, 1965.
- The map that provides the temporal distribution of the monthly rainfall
estimates is presently unavailable.
- The data set consists of monthly rainfall estimates.
Parameter Average Monthly Rainfall
Definition Monthly average of rainfall
Units of Measurement mm
Data Range 0-35 mm
- This information is not avaialable at this time.
-
8. Data Organization:
- A general description of data granularity as it applies
to the IMS appears in the
EOSDIS Glossary.
- The data
file contains the data for the period from January , 1931 to December 31, 1965.
and has size of approximately 0.125 Megabytes in compressed form (.959 Megabytes
in uncompressed mode). The file name is jaeger.dat.Z.
- The data set is in ASCII format.
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9. Data Manipulations:
- The precipitation data over the continental grids are based on the
eye estimates from isopleth maps prepared from up-to-date climatic atlases
conataining annual and monthly rainfall values, supplemeted by other
datasets. For estimating rainfall over ocean grids, Moller's method was
adopted. Monthly percentage frequencies were extracted from the mapped
isolines of the US Marine Climatic Atlas (US Naval Weather Service 1955-1965)
and interpolated to grid points, After re-expressing the monthly frequencies
as annual percentages, the values were scaled to rainfall depth units using
Geiger's(1965) precipitation map to yield monthly precipitation means.
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
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10. Errors:
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
- The Goddard DAAC completes visual inspection of the data
files that comprise the data set to ensure that the data set is complete
and that the files were not corrupted during the file transfer from the
data producer.
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11. Notes:
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
- This information is not available at this time.
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12. Application of the Data Set:
- Applications of this data set include the exploration of the
rainfall variations on the global scale over a long time period (1931 to
1960), the relationship between the rainfall variations and the
El Nino Southern Oscillation (ENSO)
conditions that occur in the Pacific during that time period, and as
supplemental information to conventional rainfall data which are often
scarce in the tropics.
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13. Future Modifications and Plans:
- The Goddard DAAC will make sure to update the data whenever any
modifications are made by the data producer.
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14. Software:
- No software is provided with this data set. However, a brief
sample Fortran code that provides information on how to read the data
set format follows:
Sample FORTRAN:
REAL PREC(72,73), MO
DO NM=1,12
READ(IUNIT,100) MO, ((PREC(LO,LA),LO=1,72),LA=1,73)
100 FORMAT(5E15.8)
ENDDO
- This information is not applicable for this data set.
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15. Data Access:
- Goddard Space Flight Center DAAC User Services.
- GSFC Distributed Active Archive Center
- This data set is available by Anonymous FTP or by contacting the GSFC DAAC User Services, which
can provide additional information on the Goddard DAAC
system capabilities, and other supported datasets. The Help Desk can be
reached at:
EOS Distributed Active Archive Center (DAAC)
Code 610.2
NASA Goddard Space Flight Center
Greenbelt, Maryland 20771
Internet:daacuso@daac.gsfc.nasa.gov
301-614-5224 (voice)
301-614-5268 (fax)
ANONYMOUS FTP:
Jaeger's Monthly Mean Global Precipitation data set resides on DAAC
anonymous FTP. The data files may be accessed from this document,
 Jaeger Monthly Mean Global Precipitation Data
- or directly via FTP at
- ftp disc1.gsfc.nasa.gov
- login: anonymous
- password: < your internet address >
- cd data/hydrology/precip/jaeger
- The Goddard DAAC plans to periodically check with the data
producer regarding updates to the data set.
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16. Output Products and Availability:
- Data sets are provided on 8 mm tapes, 4 mm tapes, CD-ROM, or
ftp .
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17. References:
-
Reference: Jaeger, L., 1983: In Street-Perrott, A., M. Beran, and
R. Ratcliffe, eds., Variations in the Global Water Budget (D.
Reidel Publishing Company, 1983), pp 129-140.
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18. Glossary of Terms:
- See the Glossary and Acronym List
for terms related to this data set.
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19. List of Acronyms:
- See the Glossary and Acronym List
for acronyms related to this data set.
Distributed Active Archive Center
- Goddard Space Flight Center
- Uniform Resource Locator
- 20. Document Information:
- August 1, 1996
- August 1, 1996
- Not available at this time.
- Not available at this time.
- Suraiya Ahmad (ahmad@daac.gsfc.nasa.gov)
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/guides/GSFC/guide/jaeger_rain_gauge_dataset.gd.shtml
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Atmos Composition
