MIRAI MR09-03 Leg2 Doppler Radar

Last Modified: 2012-09-28
: MR09-03 Leg2
: Processed (DMO)-Corrected
: JAMSTEC
: doppler velocity, reflectivity
:
ATMOSPHERE > PRECIPITATION
ATMOSPHERE > CLOUDS
ATMOSPHERE > ATMOSPHERIC WINDS
SPECTRAL/ENGINEERING > RADAR > DOPPLER VELOCITY
SPECTRAL/ENGINEERING > RADAR > RADAR REFLECTIVITY

For Using Data

Data Management Office
See Terms and Conditions about constrain of use.
See Terms and Conditions about data citation.

2009-09-10 22:00 – 2009-10-11 19:30

2009-09-10 22:00 – 2009-10-11 19:30

Instrument:
Doppler radar(- MR14-02)
 The data provided here are "MIRAI Doppler radar data set" converted into an orthogonal coordinate system after the necessary filters for each about radar reflectivity and Doppler velocity are processed. There are following two kinds in data set.
(1) The volume scan data: we composite the Doppler mode PPI scan data of plural elevation, and then converted the coordinate system of the data into three-dimensional orthogonal coordinates (horizontal 201km square, an altitude of 0-20km).
(2) The surveillance scan data: we converted two-dimensional coordinates of the intensity mode PPI scan data of the lowest elevation into an orthogonal coordinate system (horizontal 601km square).
 The correction and processing method was produced by Dr. M. Katsumata (Research Institute for Global Change/JAMSTEC) in cooperation with DMO (Data Management Office). This data processing was carried out by DMO. (See here for detailed correction methods.)
Manufacturer/model: Mitsubishi Electric Co. Ltd., Japan / RC-52B
Location (from sea surface): 18m
Frequency: 5290MHz (C band)
Peak power: 250kW
Beam angle: <1.5degree
Inertial navigation system
Manufacturer/model: IXSEA SAS, France / PHINS
Processing system
Manufacturer/model: Vaisala Inc. Sigmet Product Line, USA / RVP-7
Data acquisition software
Manufacturer/model: Vaisala Inc. Sigmet Product Line, USA / IRIS ver. 8.5.10

Parameter
Surveillance scan Volume scan
Pulse width [μs] 2.0 0.5
Scan speed [deg/sec] 18 18
PRF *1 [Hz] 260 900 / 720 *2
Sweep integration 32 samples 40 samples
Ray spacing [deg] about 1.0 about 1.0
Bin spacing [m] 250 150
Elevations [deg] 0.5 0.5, 1.0, 1.5, 2.1, 2.8, 3.5, 4.3, 5.1, 5.9, 6.8, 7.6, 8.5, 9.4, 10.4, 11.5, 12.7, 14.0, 15.5, 16.8, 18.8, 21.3
Range [km] 300 160
Scan interval 30 min *3 10 min
*1 Pulse Repetition Frequency
*2 During this cruise, the data were measured with the dual-PRF mode. Therefore, unfolding of Doppler velocity was applied automatically.
*3 Every an hour data is provided.
If you would like the raw data set, please contact us from "Contact Us" above.
1) Following periods, data were not acquired due to its system maintenance.
2009-09-14 20:30 - 2009-09-14 20:50
2009-09-14 21:30 - 2009-09-14 22:00
2009-09-15 04:40 - 2009-09-15 04:50
2009-09-16 18:50 - 2009-09-16 19:20
2009-09-18 19:00 - 2009-09-18 19:50
2009-09-30 17:30 - 2009-09-30 18:00
2009-10-06 21:10 - 2009-10-06 21:20
2009-10-06 22:10 - 2009-10-06 22:40
2) Following periods, data were not acquired due to its system trouble.
2009-10-08 08:00 - 2009-10-08 09:30
: MR09-03 Leg2
: Processed (DMO)-Corrected
: JAMSTEC
: doppler velocity, reflectivity
:
ATMOSPHERE > PRECIPITATION
ATMOSPHERE > CLOUDS
ATMOSPHERE > ATMOSPHERIC WINDS
SPECTRAL/ENGINEERING > RADAR > DOPPLER VELOCITY
SPECTRAL/ENGINEERING > RADAR > RADAR REFLECTIVITY

Observation Map

Imagery reproduced from ...

Data List

File names
20090910.zip
20090911.zip
20090912.zip
20090913.zip
20090914.zip
20090915.zip
20090916.zip
20090917.zip
20090918.zip
20090919.zip
20090920.zip
20090921.zip
20090922.zip
20090923.zip
20090924.zip
20090925.zip
20090926.zip
20090927.zip
20090928.zip
20090929.zip
20090930.zip
20091001.zip
20091002.zip
20091003.zip
20091004.zip
20091005.zip
20091006.zip
20091007.zip
20091008.zip
20091009.zip
20091010.zip
20091011.zip
: MR09-03 Leg2
: Processed (DMO)-Corrected
: JAMSTEC

Doppler DMO

The dataset is opened in the binary form of GrADS (Grid Analysis and Display System) format written in by little-endian and 4 bytes floating point.
Grid distance is 1km with horizontal and vertical directions. Owing to the factors such as beam width and beam interval, the precision of data deteriorates accompanied with the distance and altitude from the Doppler radar.
The number of the grids is as follows:
  • Volume scan : to the east and west to 201 grids, north and south to 201 grids, vertical 21 layers (0-20km)
  • Surveillance scan (range 300km) : to the east and west to 601 grids, north and south to 601 grids, vertical 1 layer
  • Surveillance scan (range 200km) : to the east and west to 401 grids, north and south to 401 grids, vertical 1 layer
  • Grid of the domain center corresponds to the position of R/V "MIRAI".
    -999.0 is a missing value.
    The control files corresponding to each data are as follows.
    • Volume scan
    • DSET ^Mirai_VS_%y4%m2%d2-%h2%n2.dat
      OPTIONS TEMPLATE
      UNDEF -999.0
      XDEF 201 LINEAR -100.0 1.0
      YDEF 201 LINEAR -100.0 1.0
      ZDEF 21 LINEAR 0.0 1.0
      TDEF X LINEAR HH:MMZDDMMMYYYY XXmn
      VARS 4
      z 21 99 reflectivity
      v 21 99 doppler velocity
      dlat 1 99 latitude
      dlon 1 99 longitude
      ENDVARS  
    • Surveillance scan (range 300km)
    • DSET ^Mirai_Z_%y4%m2%d2-%h2%n2.dat
      OPTIONS TEMPLATE
      UNDEF -999.0
      XDEF 601 LINEAR -300.0 1.0
      YDEF 601 LINEAR -300.0 1.0
      ZDEF 1 LINEAR 0.0 1.0
      TDEF X LINEAR HH:MMZDDMMMYYYY 1hr
      VARS 3
      z 1 99 reflectivity
      dlat 1 99 latitude
      dlon 1 99 longitude
      ENDVARS  
    • Surveillance scan (range 200km)
    • DSET ^Mirai_Z_%y4%m2%d2-%h2%n2.dat
      OPTIONS TEMPLATE
      UNDEF -999.0
      XDEF 401 LINEAR -200.0 1.0
      YDEF 401 LINEAR -200.0 1.0
      ZDEF 1 LINEAR 0.0 1.0
      TDEF X LINEAR HH:MMZDDMMMYYYY 1hr
      VARS 3
      z 1 99 reflectivity
      dlat 1 99 latitude
      dlon 1 99 longitude
      ENDVARS  
    The elements, the contents and the units are as follows:
    Elements Contents Units
    z Radar reflectivity dBZ
    v Doppler velocity m/s (away from the radar : +, toward from the radar : -)
    dlat Latitude deg (N : +, S : -)
    dlon Longitude deg (E, 0-360)
    Refer to http://www.iges.org/grads/ for the details about GrADS.

Related Information

Update History

2012-09-28
An observation data was registerd.