NOAA MSU (Microwave Sounding Unit) Daily Troposphere Temperatures and Precipitation
Entry ID: noaa_cdc022

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Summary
Abstract: This data set consists of two MSU tropospheric temperatures levels and
precipitation which are described in detail below. The NOAA
satellites contributing to this dataset are, in order of their launch,
TIROS-N, NOAA-6, -7, -9,- 10,-11, and NOAA-12. NOAA-8 data were not
used due to poor data quality. MSU Ch2/3 Daily Lower Troposphere
Temperatures with Lim93 Correction This data set consists of 2.5 deg
gridpoint fields of lower tropospheric deep layer temperatures
(Ch2/3). It is a level 3 gridded product that was created from the
level 2 orbit files. Data for each scan (there are 11 scan positions
per scan line) have been binned according to time and space. The
temporal binning is based on the Julian day with ascending and
descending orbits combined. The average values are calculated from
all footprints which at least partially cover the 2.5 deg by 2.5 deg
grid box. The data range is approximately 170 to 300 K. The data has
been interpolated to fill in missing values in time at each gridpoint
(a linear interpolation). It has then been interpolated from the
144x72 grid (88.75S to 88.75N) to a 144x73 grid (90S-90N). linearly
with the first and last latitude interpolated using forward
differencing. Though the data do not cover the entire grid, an entire
grid was stored for ease of use. To pull out the existing latitudes,
use gridpoint latitudes 26 to 48. There is a "mask" that indicates
whether a grid was interpolated in time. A 1 indicates that variable
wasn't interpolated and a 0 indicates it was. Since there was also an
interpolation in space, if either of the 2 boxes that went into the
final value were missing, the mask indicates the grid was interpolated
in time. MSU Ch3/4 Daily Upper Troposphere Temperatures with Lim93
Correction This data set consists of 2.5 deg gridpoint fields of upper
tropospheric deep layer temperatures (Ch 3/4) for the tropics (30 S to
30 N). It is a level 3 gridded product that was created from the
level 2 orbit files. Data for each scan (there are 11 scan positions
per scan line) have been binned according to time and space. The
temporal binning is based on the Julian day with ascending and
descending orbits combined. The average values are calculated from
all footprints which at least partially cover the 2.5 deg by 2.5 deg
grid box. The data range is approximately 150 to 290 K. The data
precision has been maintained at 0.01 K. The data has been
interpolated to fill in missing values in time at each gridpoint (a
linear interpolation). It has then been interpolated from the 144x72
grid (88.75S to 88.75N) to a 144x73 grid (90S-90N). linearly with the
fist and last latitude interpolated using forward differencing.
Though the data do not cover the entire grid, an entire grid was
stored for ease of use. To pull out the existing latitudes, use
gridpoint latitudes 26 to 48. There is a "mask" that indicates
whether a grid was interpolated in time. A 1 indicates that variable
wasn't interpolated and a 0 indicates it was. Since there was also an
interpolation in space, if either of the 2 boxes that went into the
final value were missing, the mask indicates the grid was interpolated
in time. MSU precipitation Daily average and monthly total
precipitation values linearily interpolated from a 144x72 grid to a
144x73 grid are provided. The dataset covers 60S-60N only (all
longitudes) but a full grid was stored for ease of use. Please note
that for 1994 and onwards, sea ice has not been correctly taken into
account. We have applied a mask to screen out some of the resulting
erroneous precipitation values. The data will be replaced with
correct values when we receive them. Only precipitation values nearest
to the poles are affected. See Cathy Smith (cas@cdc.noaa.gov) for
details on the mask. For the spatial interpolation, a missing value
was stored if either of the 2 gridpoints that went into the
interpolated gridpoint was missing. This will result in less grids
available near land. Monthly totals were computed using the above
daily values. A daily average was calculated at each grid for each
month using all available days. Then, if the number of days in the
month that wasn't missing was 25 or above, the daily average was
multiplied by the total days in the month. Otherwise, a missing value
was stored. A long term mean file was computed using the monthly total
file for 1979-1995. A minimum of 10 years was required for a gridpoint
to be kept. Both monthly mean files contain a variable that has the
number of days and months respectively that went into the monthly mean
and ltm files. This variable is called "nobs" and can be read with
gridread (a netopen subroutine). Additional information is available
from a summary provided by the data set originators.

NOAAServer Codes: [POL 90 -90 180 -180] ; nodateline preview obtain


Purpose: Scientific research.

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Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: NOAA-CIRES Climate Diagnostics Center
Dataset Title: NOAA MSU (Microwave Sounding Unit) Daily Troposphere Temperatures and Precipitation
Dataset Release Date: 1996-11-01
Dataset Release Place: Boulder, CO
Dataset Publisher: NOAA-CIRES Climate Diagnostics Center
Online Resource: http://www.cdc.noaa.gov/cdc/data.msu.html


Temporal Coverage
Start Date: 1979-01-01
Stop Date: 1996-11-01


Location Keywords
GEOGRAPHIC REGION > GLOBAL


Science Keywords
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE    [Definition]
ATMOSPHERE >PRECIPITATION >PRECIPITATION AMOUNT    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Access Constraints
None.


Use Constraints
None. Acknowledgement of CDC would appreciated in products derived
from these data.


Keywords
MSU [POL 90.00 -90.00 180 -180]
MSU Air Temperature Channel 2/3
MSU Air Temperature Channel 3/4
Number of days missing
Precipitation
TEMS
GTOS
G3OS


Data Set Progress
COMPLETE


Data Center
Climate Analysis Branch, Physical Sciences Division, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.esrl.noaa.gov/psd/psd1/
Dataset ID: CDC022

Data Center Personnel
Name: ESRL/PSD DATA INQUIRIES
Email: esrl.psd.data at noaa.gov


Personnel
ESRL/PSD DATA INQUIRIES
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Email: esrl.psd.data at noaa.gov



Creation and Review Dates
DIF Creation Date: 2002-03-11
Last DIF Revision Date: 2009-07-06

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