Observing System Simulation Experiments at CIMSS

1
Observing System Simulation Experiments at CIMSS
By CIMSS/OSSE Team Bob Aune Paul Menzel
Jonathan Thom Gail Bayler Chris Velden Tim
Olander and Allen Huang Cooperative Institute
for Meteorological Satellite Studies University
of Wisconsin 7 June, 1999
2
(No Transcript)
3
Road Map

• 1) Geostationary Interferometer Initial Focus
• Soundings (S) T, Td
• Winds (W)
• Soundings plus Winds
• Soundings, Winds plus Conventional Data (CD)
• 2) First Simulated Products Followed by
  Derived Products from Simulated Radiances
• 3) Investigation of LIDAR Winds on top of S, W,
  and CD

4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
(No Transcript)
9
(No Transcript)
10
UW-NMS Domain in the Eta 104 grid
11
OSSE Control (Nature) Verification
12
OSSE Control (Nature) Verification
13
OSSE Control (Nature) Verification
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
(No Transcript)
19

• 4. Assess The Impact
• The impact of the observations will be assessed
  by objectively measuring the ability of each
  observing system to steer the resulting 12-hour
  forecasts toward the true atmosphere.
• Observation count
• T/Td WIND Experiment
• None None No Observations
  (NO) NO OBS
• 5000 6000 Geo. Radiometer
  (GR) GEO-R
• 5000 6000 Geo. Interferometer
  (GI) GEO-I
• 6200 12000 Perfect Observations
  (PO) OPTIMAL
• profile vector

20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24
(No Transcript)
25
(No Transcript)
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)
29
Wind Objectives

• 1) To assess the value of wind observations to
  operational mesoscale numerical weather forecasts
  in a controlled environment
• 2) To assess the incremental value of current and
  future geostationary infrared/visible, and LIDAR
  wind measurements

30
Wind Profile OSSE

• Simulated Error for Clear Water Vapor Winds (m/s)
• Pressure (mb) GEO-R GEO-I
• 200 N/A
  4
• 300 6
  4
• 400 5.5
  3.5
• 500 5
  3
• 700 N/A
  2.5
• Projected 30-40 improvement over Geo-R

31
Wind Profile OSSE

• Simulated Error for Cloudy Water Vapor IR Winds
  (m/s)
• Pressure (mb) GEO-R GEO-I
• 200 5.5
  3.6
• 300 5
  3.3
• 400 4.5
  2.9
• 500 4.5
  2.9
• 700 4.0
  2.6
• 850 3.5
  2.3
• Projected 30-40 improvement over Geo-R
• Cloud altitude defines wind level

32
Winds OSSE Results
33
Winds OSSE Results - Continued
Winds OSSE results are preliminary
34
Winds Versus Soundings
35
Winds Versus Soundings - Continued
36
Current Status

• 1) OSSE is designed, implemented, and pilot
  experiment conducted.
• 2) Winds counterpart, sounding profiles, are
  successfully assimilated and forecast impact
  assessed for a case study.
• 3) Winds assimilation is performed and is under
  detailed analysis now.
• 4) CIMSS OSSE home page
• http//cimss.ssec.wisc.edu/model/osse/osse05.html

37
Plans for the On-going Work

• 1) Simulate winds using radiances
• 2) 14 day test periods (winter and spring)
• 3) Conventional observing system evaluation
• 4) Low Earth Orbit (LEO) OSSE
• 5) Temperature/water vapor sounding and winds
  combined OSSE
• 6) LIDAR wind OSSE

38
Hurricane Bonnie Wind and Cloud Fields
Wind Vectors Red - 1 km level Green - 14 km
level Clouds Light gray - Ice
Cloud Dark Gray - Water Cloud
39
Hurricane Bonnie Wind and Cloud Fields
Wind Vectors Magenta Stream Lines
Green (_at_ 4 km) Clouds Light gray - Ice
Cloud Dark Gray - Water Cloud
40
GOES Radiances Simulation Verification
41
Wind Tracking Verification
42
Wind Tracking Verification - Continued